6612 lines
379 KiB
JavaScript
Executable File
6612 lines
379 KiB
JavaScript
Executable File
/*!
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* Knockout JavaScript library v3.5.1
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* (c) The Knockout.js team - http://knockoutjs.com/
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* License: MIT (http://www.opensource.org/licenses/mit-license.php)
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*/
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(function(){
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var DEBUG=true;
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(function(undefined){
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// (0, eval)('this') is a robust way of getting a reference to the global object
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// For details, see http://stackoverflow.com/questions/14119988/return-this-0-evalthis/14120023#14120023
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var window = this || (0, eval)('this'),
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document = window['document'],
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navigator = window['navigator'],
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jQueryInstance = window["jQuery"],
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JSON = window["JSON"];
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if (!jQueryInstance && typeof jQuery !== "undefined") {
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jQueryInstance = jQuery;
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}
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(function(factory) {
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// Support three module loading scenarios
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if (typeof define === 'function' && define['amd']) {
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// [1] AMD anonymous module
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define(['exports', 'require'], factory);
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} else if (typeof exports === 'object' && typeof module === 'object') {
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// [2] CommonJS/Node.js
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factory(module['exports'] || exports); // module.exports is for Node.js
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} else {
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// [3] No module loader (plain <script> tag) - put directly in global namespace
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factory(window['ko'] = {});
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}
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}(function(koExports, amdRequire){
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// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
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// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
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var ko = typeof koExports !== 'undefined' ? koExports : {};
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// Google Closure Compiler helpers (used only to make the minified file smaller)
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ko.exportSymbol = function(koPath, object) {
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var tokens = koPath.split(".");
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// In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
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// At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
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var target = ko;
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for (var i = 0; i < tokens.length - 1; i++)
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target = target[tokens[i]];
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target[tokens[tokens.length - 1]] = object;
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};
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ko.exportProperty = function(owner, publicName, object) {
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owner[publicName] = object;
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};
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ko.version = "3.5.1";
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ko.exportSymbol('version', ko.version);
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// For any options that may affect various areas of Knockout and aren't directly associated with data binding.
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ko.options = {
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'deferUpdates': false,
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'useOnlyNativeEvents': false,
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'foreachHidesDestroyed': false
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};
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//ko.exportSymbol('options', ko.options); // 'options' isn't minified
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ko.utils = (function () {
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var hasOwnProperty = Object.prototype.hasOwnProperty;
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function objectForEach(obj, action) {
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for (var prop in obj) {
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if (hasOwnProperty.call(obj, prop)) {
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action(prop, obj[prop]);
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}
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}
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}
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function extend(target, source) {
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if (source) {
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for(var prop in source) {
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if(hasOwnProperty.call(source, prop)) {
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target[prop] = source[prop];
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}
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}
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}
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return target;
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}
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function setPrototypeOf(obj, proto) {
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obj.__proto__ = proto;
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return obj;
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}
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var canSetPrototype = ({ __proto__: [] } instanceof Array);
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var canUseSymbols = !DEBUG && typeof Symbol === 'function';
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// Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
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var knownEvents = {}, knownEventTypesByEventName = {};
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var keyEventTypeName = (navigator && /Firefox\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents';
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knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
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knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
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objectForEach(knownEvents, function(eventType, knownEventsForType) {
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if (knownEventsForType.length) {
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for (var i = 0, j = knownEventsForType.length; i < j; i++)
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knownEventTypesByEventName[knownEventsForType[i]] = eventType;
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}
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});
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var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
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// Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
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// Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
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// Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
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// If there is a future need to detect specific versions of IE10+, we will amend this.
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var ieVersion = document && (function() {
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var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
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// Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
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while (
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div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
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iElems[0]
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) {}
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return version > 4 ? version : undefined;
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}());
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var isIe6 = ieVersion === 6,
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isIe7 = ieVersion === 7;
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function isClickOnCheckableElement(element, eventType) {
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if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
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if (eventType.toLowerCase() != "click") return false;
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var inputType = element.type;
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return (inputType == "checkbox") || (inputType == "radio");
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}
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// For details on the pattern for changing node classes
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// see: https://github.com/knockout/knockout/issues/1597
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var cssClassNameRegex = /\S+/g;
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var jQueryEventAttachName;
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function toggleDomNodeCssClass(node, classNames, shouldHaveClass) {
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var addOrRemoveFn;
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if (classNames) {
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if (typeof node.classList === 'object') {
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addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove'];
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ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
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addOrRemoveFn.call(node.classList, className);
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});
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} else if (typeof node.className['baseVal'] === 'string') {
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// SVG tag .classNames is an SVGAnimatedString instance
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toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass);
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} else {
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// node.className ought to be a string.
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toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass);
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}
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}
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}
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function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) {
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// obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'.
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var currentClassNames = obj[prop].match(cssClassNameRegex) || [];
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ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
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ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
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});
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obj[prop] = currentClassNames.join(" ");
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}
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return {
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fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
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arrayForEach: function (array, action, actionOwner) {
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for (var i = 0, j = array.length; i < j; i++) {
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action.call(actionOwner, array[i], i, array);
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}
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},
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arrayIndexOf: typeof Array.prototype.indexOf == "function"
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? function (array, item) {
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return Array.prototype.indexOf.call(array, item);
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}
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: function (array, item) {
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for (var i = 0, j = array.length; i < j; i++) {
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if (array[i] === item)
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return i;
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}
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return -1;
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},
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arrayFirst: function (array, predicate, predicateOwner) {
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for (var i = 0, j = array.length; i < j; i++) {
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if (predicate.call(predicateOwner, array[i], i, array))
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return array[i];
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}
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return undefined;
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},
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arrayRemoveItem: function (array, itemToRemove) {
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var index = ko.utils.arrayIndexOf(array, itemToRemove);
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if (index > 0) {
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array.splice(index, 1);
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}
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else if (index === 0) {
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array.shift();
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}
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},
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arrayGetDistinctValues: function (array) {
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var result = [];
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if (array) {
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ko.utils.arrayForEach(array, function(item) {
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if (ko.utils.arrayIndexOf(result, item) < 0)
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result.push(item);
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});
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}
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return result;
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},
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arrayMap: function (array, mapping, mappingOwner) {
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var result = [];
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if (array) {
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for (var i = 0, j = array.length; i < j; i++)
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result.push(mapping.call(mappingOwner, array[i], i));
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}
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return result;
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},
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arrayFilter: function (array, predicate, predicateOwner) {
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var result = [];
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if (array) {
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for (var i = 0, j = array.length; i < j; i++)
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if (predicate.call(predicateOwner, array[i], i))
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result.push(array[i]);
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}
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return result;
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},
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arrayPushAll: function (array, valuesToPush) {
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if (valuesToPush instanceof Array)
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array.push.apply(array, valuesToPush);
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else
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for (var i = 0, j = valuesToPush.length; i < j; i++)
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array.push(valuesToPush[i]);
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return array;
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},
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addOrRemoveItem: function(array, value, included) {
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var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value);
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if (existingEntryIndex < 0) {
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if (included)
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array.push(value);
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} else {
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if (!included)
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array.splice(existingEntryIndex, 1);
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}
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},
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canSetPrototype: canSetPrototype,
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extend: extend,
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setPrototypeOf: setPrototypeOf,
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setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,
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objectForEach: objectForEach,
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objectMap: function(source, mapping, mappingOwner) {
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if (!source)
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return source;
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var target = {};
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for (var prop in source) {
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if (hasOwnProperty.call(source, prop)) {
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target[prop] = mapping.call(mappingOwner, source[prop], prop, source);
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}
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}
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return target;
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},
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emptyDomNode: function (domNode) {
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while (domNode.firstChild) {
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ko.removeNode(domNode.firstChild);
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}
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},
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moveCleanedNodesToContainerElement: function(nodes) {
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// Ensure it's a real array, as we're about to reparent the nodes and
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// we don't want the underlying collection to change while we're doing that.
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var nodesArray = ko.utils.makeArray(nodes);
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var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document;
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var container = templateDocument.createElement('div');
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for (var i = 0, j = nodesArray.length; i < j; i++) {
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container.appendChild(ko.cleanNode(nodesArray[i]));
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}
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return container;
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},
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cloneNodes: function (nodesArray, shouldCleanNodes) {
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for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
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var clonedNode = nodesArray[i].cloneNode(true);
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newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
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}
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return newNodesArray;
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},
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setDomNodeChildren: function (domNode, childNodes) {
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ko.utils.emptyDomNode(domNode);
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if (childNodes) {
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for (var i = 0, j = childNodes.length; i < j; i++)
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domNode.appendChild(childNodes[i]);
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}
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},
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replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
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var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
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if (nodesToReplaceArray.length > 0) {
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var insertionPoint = nodesToReplaceArray[0];
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var parent = insertionPoint.parentNode;
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for (var i = 0, j = newNodesArray.length; i < j; i++)
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parent.insertBefore(newNodesArray[i], insertionPoint);
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for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
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ko.removeNode(nodesToReplaceArray[i]);
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}
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}
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},
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fixUpContinuousNodeArray: function(continuousNodeArray, parentNode) {
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// Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile
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// them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that
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// new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
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// leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
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// So, this function translates the old "map" output array into its best guess of the set of current DOM nodes.
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//
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// Rules:
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// [A] Any leading nodes that have been removed should be ignored
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// These most likely correspond to memoization nodes that were already removed during binding
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// See https://github.com/knockout/knockout/pull/440
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// [B] Any trailing nodes that have been remove should be ignored
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// This prevents the code here from adding unrelated nodes to the array while processing rule [C]
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// See https://github.com/knockout/knockout/pull/1903
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// [C] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed,
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// and include any nodes that have been inserted among the previous collection
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if (continuousNodeArray.length) {
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// The parent node can be a virtual element; so get the real parent node
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parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode;
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// Rule [A]
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while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode)
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continuousNodeArray.splice(0, 1);
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// Rule [B]
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while (continuousNodeArray.length > 1 && continuousNodeArray[continuousNodeArray.length - 1].parentNode !== parentNode)
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continuousNodeArray.length--;
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// Rule [C]
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if (continuousNodeArray.length > 1) {
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var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1];
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// Replace with the actual new continuous node set
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continuousNodeArray.length = 0;
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while (current !== last) {
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continuousNodeArray.push(current);
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current = current.nextSibling;
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}
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continuousNodeArray.push(last);
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}
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}
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return continuousNodeArray;
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},
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setOptionNodeSelectionState: function (optionNode, isSelected) {
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// IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
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if (ieVersion < 7)
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optionNode.setAttribute("selected", isSelected);
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else
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optionNode.selected = isSelected;
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},
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stringTrim: function (string) {
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return string === null || string === undefined ? '' :
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string.trim ?
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string.trim() :
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string.toString().replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
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},
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stringStartsWith: function (string, startsWith) {
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string = string || "";
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if (startsWith.length > string.length)
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return false;
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return string.substring(0, startsWith.length) === startsWith;
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},
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domNodeIsContainedBy: function (node, containedByNode) {
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if (node === containedByNode)
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return true;
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if (node.nodeType === 11)
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return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8
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if (containedByNode.contains)
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return containedByNode.contains(node.nodeType !== 1 ? node.parentNode : node);
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if (containedByNode.compareDocumentPosition)
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return (containedByNode.compareDocumentPosition(node) & 16) == 16;
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while (node && node != containedByNode) {
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node = node.parentNode;
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}
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return !!node;
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},
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domNodeIsAttachedToDocument: function (node) {
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return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement);
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},
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anyDomNodeIsAttachedToDocument: function(nodes) {
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return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);
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},
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tagNameLower: function(element) {
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// For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
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// Possible future optimization: If we know it's an element from an XHTML document (not HTML),
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// we don't need to do the .toLowerCase() as it will always be lower case anyway.
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return element && element.tagName && element.tagName.toLowerCase();
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},
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catchFunctionErrors: function (delegate) {
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return ko['onError'] ? function () {
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try {
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return delegate.apply(this, arguments);
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} catch (e) {
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ko['onError'] && ko['onError'](e);
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throw e;
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}
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} : delegate;
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},
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setTimeout: function (handler, timeout) {
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return setTimeout(ko.utils.catchFunctionErrors(handler), timeout);
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},
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deferError: function (error) {
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setTimeout(function () {
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ko['onError'] && ko['onError'](error);
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throw error;
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}, 0);
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},
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registerEventHandler: function (element, eventType, handler) {
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var wrappedHandler = ko.utils.catchFunctionErrors(handler);
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var mustUseAttachEvent = eventsThatMustBeRegisteredUsingAttachEvent[eventType];
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if (!ko.options['useOnlyNativeEvents'] && !mustUseAttachEvent && jQueryInstance) {
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if (!jQueryEventAttachName) {
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jQueryEventAttachName = (typeof jQueryInstance(element)['on'] == 'function') ? 'on' : 'bind';
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}
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jQueryInstance(element)[jQueryEventAttachName](eventType, wrappedHandler);
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} else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
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element.addEventListener(eventType, wrappedHandler, false);
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else if (typeof element.attachEvent != "undefined") {
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var attachEventHandler = function (event) { wrappedHandler.call(element, event); },
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attachEventName = "on" + eventType;
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element.attachEvent(attachEventName, attachEventHandler);
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|
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// IE does not dispose attachEvent handlers automatically (unlike with addEventListener)
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|
// so to avoid leaks, we have to remove them manually. See bug #856
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ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
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element.detachEvent(attachEventName, attachEventHandler);
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});
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} else
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throw new Error("Browser doesn't support addEventListener or attachEvent");
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},
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triggerEvent: function (element, eventType) {
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if (!(element && element.nodeType))
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|
throw new Error("element must be a DOM node when calling triggerEvent");
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// For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the
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// event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.)
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// IE doesn't change the checked state when you trigger the click event using "fireEvent".
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// In both cases, we'll use the click method instead.
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|
var useClickWorkaround = isClickOnCheckableElement(element, eventType);
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|
|
if (!ko.options['useOnlyNativeEvents'] && jQueryInstance && !useClickWorkaround) {
|
|
jQueryInstance(element)['trigger'](eventType);
|
|
} else if (typeof document.createEvent == "function") {
|
|
if (typeof element.dispatchEvent == "function") {
|
|
var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
|
|
var event = document.createEvent(eventCategory);
|
|
event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
|
|
element.dispatchEvent(event);
|
|
}
|
|
else
|
|
throw new Error("The supplied element doesn't support dispatchEvent");
|
|
} else if (useClickWorkaround && element.click) {
|
|
element.click();
|
|
} else if (typeof element.fireEvent != "undefined") {
|
|
element.fireEvent("on" + eventType);
|
|
} else {
|
|
throw new Error("Browser doesn't support triggering events");
|
|
}
|
|
},
|
|
|
|
unwrapObservable: function (value) {
|
|
return ko.isObservable(value) ? value() : value;
|
|
},
|
|
|
|
peekObservable: function (value) {
|
|
return ko.isObservable(value) ? value.peek() : value;
|
|
},
|
|
|
|
toggleDomNodeCssClass: toggleDomNodeCssClass,
|
|
|
|
setTextContent: function(element, textContent) {
|
|
var value = ko.utils.unwrapObservable(textContent);
|
|
if ((value === null) || (value === undefined))
|
|
value = "";
|
|
|
|
// We need there to be exactly one child: a text node.
|
|
// If there are no children, more than one, or if it's not a text node,
|
|
// we'll clear everything and create a single text node.
|
|
var innerTextNode = ko.virtualElements.firstChild(element);
|
|
if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
|
|
ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]);
|
|
} else {
|
|
innerTextNode.data = value;
|
|
}
|
|
|
|
ko.utils.forceRefresh(element);
|
|
},
|
|
|
|
setElementName: function(element, name) {
|
|
element.name = name;
|
|
|
|
// Workaround IE 6/7 issue
|
|
// - https://github.com/SteveSanderson/knockout/issues/197
|
|
// - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
|
|
if (ieVersion <= 7) {
|
|
try {
|
|
var escapedName = element.name.replace(/[&<>'"]/g, function(r){ return "&#" + r.charCodeAt(0) + ";"; });
|
|
element.mergeAttributes(document.createElement("<input name='" + escapedName + "'/>"), false);
|
|
}
|
|
catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
|
|
}
|
|
},
|
|
|
|
forceRefresh: function(node) {
|
|
// Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
|
|
if (ieVersion >= 9) {
|
|
// For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
|
|
var elem = node.nodeType == 1 ? node : node.parentNode;
|
|
if (elem.style)
|
|
elem.style.zoom = elem.style.zoom;
|
|
}
|
|
},
|
|
|
|
ensureSelectElementIsRenderedCorrectly: function(selectElement) {
|
|
// Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
|
|
// (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
|
|
// Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839)
|
|
if (ieVersion) {
|
|
var originalWidth = selectElement.style.width;
|
|
selectElement.style.width = 0;
|
|
selectElement.style.width = originalWidth;
|
|
}
|
|
},
|
|
|
|
range: function (min, max) {
|
|
min = ko.utils.unwrapObservable(min);
|
|
max = ko.utils.unwrapObservable(max);
|
|
var result = [];
|
|
for (var i = min; i <= max; i++)
|
|
result.push(i);
|
|
return result;
|
|
},
|
|
|
|
makeArray: function(arrayLikeObject) {
|
|
var result = [];
|
|
for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
|
|
result.push(arrayLikeObject[i]);
|
|
};
|
|
return result;
|
|
},
|
|
|
|
createSymbolOrString: function(identifier) {
|
|
return canUseSymbols ? Symbol(identifier) : identifier;
|
|
},
|
|
|
|
isIe6 : isIe6,
|
|
isIe7 : isIe7,
|
|
ieVersion : ieVersion,
|
|
|
|
getFormFields: function(form, fieldName) {
|
|
var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
|
|
var isMatchingField = (typeof fieldName == 'string')
|
|
? function(field) { return field.name === fieldName }
|
|
: function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
|
|
var matches = [];
|
|
for (var i = fields.length - 1; i >= 0; i--) {
|
|
if (isMatchingField(fields[i]))
|
|
matches.push(fields[i]);
|
|
};
|
|
return matches;
|
|
},
|
|
|
|
parseJson: function (jsonString) {
|
|
if (typeof jsonString == "string") {
|
|
jsonString = ko.utils.stringTrim(jsonString);
|
|
if (jsonString) {
|
|
if (JSON && JSON.parse) // Use native parsing where available
|
|
return JSON.parse(jsonString);
|
|
return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
|
|
}
|
|
}
|
|
return null;
|
|
},
|
|
|
|
stringifyJson: function (data, replacer, space) { // replacer and space are optional
|
|
if (!JSON || !JSON.stringify)
|
|
throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
|
|
return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
|
|
},
|
|
|
|
postJson: function (urlOrForm, data, options) {
|
|
options = options || {};
|
|
var params = options['params'] || {};
|
|
var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
|
|
var url = urlOrForm;
|
|
|
|
// If we were given a form, use its 'action' URL and pick out any requested field values
|
|
if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
|
|
var originalForm = urlOrForm;
|
|
url = originalForm.action;
|
|
for (var i = includeFields.length - 1; i >= 0; i--) {
|
|
var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
|
|
for (var j = fields.length - 1; j >= 0; j--)
|
|
params[fields[j].name] = fields[j].value;
|
|
}
|
|
}
|
|
|
|
data = ko.utils.unwrapObservable(data);
|
|
var form = document.createElement("form");
|
|
form.style.display = "none";
|
|
form.action = url;
|
|
form.method = "post";
|
|
for (var key in data) {
|
|
// Since 'data' this is a model object, we include all properties including those inherited from its prototype
|
|
var input = document.createElement("input");
|
|
input.type = "hidden";
|
|
input.name = key;
|
|
input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
|
|
form.appendChild(input);
|
|
}
|
|
objectForEach(params, function(key, value) {
|
|
var input = document.createElement("input");
|
|
input.type = "hidden";
|
|
input.name = key;
|
|
input.value = value;
|
|
form.appendChild(input);
|
|
});
|
|
document.body.appendChild(form);
|
|
options['submitter'] ? options['submitter'](form) : form.submit();
|
|
setTimeout(function () { form.parentNode.removeChild(form); }, 0);
|
|
}
|
|
}
|
|
}());
|
|
|
|
ko.exportSymbol('utils', ko.utils);
|
|
ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
|
|
ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
|
|
ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
|
|
ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
|
|
ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
|
|
ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
|
|
ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
|
|
ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
|
|
ko.exportSymbol('utils.cloneNodes', ko.utils.cloneNodes);
|
|
ko.exportSymbol('utils.createSymbolOrString', ko.utils.createSymbolOrString);
|
|
ko.exportSymbol('utils.extend', ko.utils.extend);
|
|
ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
|
|
ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
|
|
ko.exportSymbol('utils.objectMap', ko.utils.objectMap);
|
|
ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
|
|
ko.exportSymbol('utils.postJson', ko.utils.postJson);
|
|
ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
|
|
ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
|
|
ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
|
|
ko.exportSymbol('utils.range', ko.utils.range);
|
|
ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
|
|
ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
|
|
ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
|
|
ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach);
|
|
ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem);
|
|
ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent);
|
|
ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly
|
|
|
|
if (!Function.prototype['bind']) {
|
|
// Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
|
|
// In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
|
|
Function.prototype['bind'] = function (object) {
|
|
var originalFunction = this;
|
|
if (arguments.length === 1) {
|
|
return function () {
|
|
return originalFunction.apply(object, arguments);
|
|
};
|
|
} else {
|
|
var partialArgs = Array.prototype.slice.call(arguments, 1);
|
|
return function () {
|
|
var args = partialArgs.slice(0);
|
|
args.push.apply(args, arguments);
|
|
return originalFunction.apply(object, args);
|
|
};
|
|
}
|
|
};
|
|
}
|
|
|
|
ko.utils.domData = new (function () {
|
|
var uniqueId = 0;
|
|
var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
|
|
var dataStore = {};
|
|
|
|
var getDataForNode, clear;
|
|
if (!ko.utils.ieVersion) {
|
|
// We considered using WeakMap, but it has a problem in IE 11 and Edge that prevents using
|
|
// it cross-window, so instead we just store the data directly on the node.
|
|
// See https://github.com/knockout/knockout/issues/2141
|
|
getDataForNode = function (node, createIfNotFound) {
|
|
var dataForNode = node[dataStoreKeyExpandoPropertyName];
|
|
if (!dataForNode && createIfNotFound) {
|
|
dataForNode = node[dataStoreKeyExpandoPropertyName] = {};
|
|
}
|
|
return dataForNode;
|
|
};
|
|
clear = function (node) {
|
|
if (node[dataStoreKeyExpandoPropertyName]) {
|
|
delete node[dataStoreKeyExpandoPropertyName];
|
|
return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
|
|
}
|
|
return false;
|
|
};
|
|
} else {
|
|
// Old IE versions have memory issues if you store objects on the node, so we use a
|
|
// separate data storage and link to it from the node using a string key.
|
|
getDataForNode = function (node, createIfNotFound) {
|
|
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
|
|
var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
|
|
if (!hasExistingDataStore) {
|
|
if (!createIfNotFound)
|
|
return undefined;
|
|
dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
|
|
dataStore[dataStoreKey] = {};
|
|
}
|
|
return dataStore[dataStoreKey];
|
|
};
|
|
clear = function (node) {
|
|
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
|
|
if (dataStoreKey) {
|
|
delete dataStore[dataStoreKey];
|
|
node[dataStoreKeyExpandoPropertyName] = null;
|
|
return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
|
|
}
|
|
return false;
|
|
};
|
|
}
|
|
|
|
return {
|
|
get: function (node, key) {
|
|
var dataForNode = getDataForNode(node, false);
|
|
return dataForNode && dataForNode[key];
|
|
},
|
|
set: function (node, key, value) {
|
|
// Make sure we don't actually create a new domData key if we are actually deleting a value
|
|
var dataForNode = getDataForNode(node, value !== undefined /* createIfNotFound */);
|
|
dataForNode && (dataForNode[key] = value);
|
|
},
|
|
getOrSet: function (node, key, value) {
|
|
var dataForNode = getDataForNode(node, true /* createIfNotFound */);
|
|
return dataForNode[key] || (dataForNode[key] = value);
|
|
},
|
|
clear: clear,
|
|
|
|
nextKey: function () {
|
|
return (uniqueId++) + dataStoreKeyExpandoPropertyName;
|
|
}
|
|
};
|
|
})();
|
|
|
|
ko.exportSymbol('utils.domData', ko.utils.domData);
|
|
ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
|
|
|
|
ko.utils.domNodeDisposal = new (function () {
|
|
var domDataKey = ko.utils.domData.nextKey();
|
|
var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document
|
|
var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
|
|
|
|
function getDisposeCallbacksCollection(node, createIfNotFound) {
|
|
var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
|
|
if ((allDisposeCallbacks === undefined) && createIfNotFound) {
|
|
allDisposeCallbacks = [];
|
|
ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
|
|
}
|
|
return allDisposeCallbacks;
|
|
}
|
|
function destroyCallbacksCollection(node) {
|
|
ko.utils.domData.set(node, domDataKey, undefined);
|
|
}
|
|
|
|
function cleanSingleNode(node) {
|
|
// Run all the dispose callbacks
|
|
var callbacks = getDisposeCallbacksCollection(node, false);
|
|
if (callbacks) {
|
|
callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
|
|
for (var i = 0; i < callbacks.length; i++)
|
|
callbacks[i](node);
|
|
}
|
|
|
|
// Erase the DOM data
|
|
ko.utils.domData.clear(node);
|
|
|
|
// Perform cleanup needed by external libraries (currently only jQuery, but can be extended)
|
|
ko.utils.domNodeDisposal["cleanExternalData"](node);
|
|
|
|
// Clear any immediate-child comment nodes, as these wouldn't have been found by
|
|
// node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
|
|
if (cleanableNodeTypesWithDescendants[node.nodeType]) {
|
|
cleanNodesInList(node.childNodes, true/*onlyComments*/);
|
|
}
|
|
}
|
|
|
|
function cleanNodesInList(nodeList, onlyComments) {
|
|
var cleanedNodes = [], lastCleanedNode;
|
|
for (var i = 0; i < nodeList.length; i++) {
|
|
if (!onlyComments || nodeList[i].nodeType === 8) {
|
|
cleanSingleNode(cleanedNodes[cleanedNodes.length] = lastCleanedNode = nodeList[i]);
|
|
if (nodeList[i] !== lastCleanedNode) {
|
|
while (i-- && ko.utils.arrayIndexOf(cleanedNodes, nodeList[i]) == -1) {}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return {
|
|
addDisposeCallback : function(node, callback) {
|
|
if (typeof callback != "function")
|
|
throw new Error("Callback must be a function");
|
|
getDisposeCallbacksCollection(node, true).push(callback);
|
|
},
|
|
|
|
removeDisposeCallback : function(node, callback) {
|
|
var callbacksCollection = getDisposeCallbacksCollection(node, false);
|
|
if (callbacksCollection) {
|
|
ko.utils.arrayRemoveItem(callbacksCollection, callback);
|
|
if (callbacksCollection.length == 0)
|
|
destroyCallbacksCollection(node);
|
|
}
|
|
},
|
|
|
|
cleanNode : function(node) {
|
|
ko.dependencyDetection.ignore(function () {
|
|
// First clean this node, where applicable
|
|
if (cleanableNodeTypes[node.nodeType]) {
|
|
cleanSingleNode(node);
|
|
|
|
// ... then its descendants, where applicable
|
|
if (cleanableNodeTypesWithDescendants[node.nodeType]) {
|
|
cleanNodesInList(node.getElementsByTagName("*"));
|
|
}
|
|
}
|
|
});
|
|
|
|
return node;
|
|
},
|
|
|
|
removeNode : function(node) {
|
|
ko.cleanNode(node);
|
|
if (node.parentNode)
|
|
node.parentNode.removeChild(node);
|
|
},
|
|
|
|
"cleanExternalData" : function (node) {
|
|
// Special support for jQuery here because it's so commonly used.
|
|
// Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
|
|
// so notify it to tear down any resources associated with the node & descendants here.
|
|
if (jQueryInstance && (typeof jQueryInstance['cleanData'] == "function"))
|
|
jQueryInstance['cleanData']([node]);
|
|
}
|
|
};
|
|
})();
|
|
ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
|
|
ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
|
|
ko.exportSymbol('cleanNode', ko.cleanNode);
|
|
ko.exportSymbol('removeNode', ko.removeNode);
|
|
ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
|
|
ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
|
|
ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
|
|
(function () {
|
|
var none = [0, "", ""],
|
|
table = [1, "<table>", "</table>"],
|
|
tbody = [2, "<table><tbody>", "</tbody></table>"],
|
|
tr = [3, "<table><tbody><tr>", "</tr></tbody></table>"],
|
|
select = [1, "<select multiple='multiple'>", "</select>"],
|
|
lookup = {
|
|
'thead': table,
|
|
'tbody': table,
|
|
'tfoot': table,
|
|
'tr': tbody,
|
|
'td': tr,
|
|
'th': tr,
|
|
'option': select,
|
|
'optgroup': select
|
|
},
|
|
|
|
// This is needed for old IE if you're *not* using either jQuery or innerShiv. Doesn't affect other cases.
|
|
mayRequireCreateElementHack = ko.utils.ieVersion <= 8;
|
|
|
|
function getWrap(tags) {
|
|
var m = tags.match(/^(?:<!--.*?-->\s*?)*?<([a-z]+)[\s>]/);
|
|
return (m && lookup[m[1]]) || none;
|
|
}
|
|
|
|
function simpleHtmlParse(html, documentContext) {
|
|
documentContext || (documentContext = document);
|
|
var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;
|
|
|
|
// Based on jQuery's "clean" function, but only accounting for table-related elements.
|
|
// If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
|
|
|
|
// Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
|
|
// a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
|
|
// This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
|
|
// (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
|
|
|
|
// Trim whitespace, otherwise indexOf won't work as expected
|
|
var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div"),
|
|
wrap = getWrap(tags),
|
|
depth = wrap[0];
|
|
|
|
// Go to html and back, then peel off extra wrappers
|
|
// Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
|
|
var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
|
|
if (typeof windowContext['innerShiv'] == "function") {
|
|
// Note that innerShiv is deprecated in favour of html5shiv. We should consider adding
|
|
// support for html5shiv (except if no explicit support is needed, e.g., if html5shiv
|
|
// somehow shims the native APIs so it just works anyway)
|
|
div.appendChild(windowContext['innerShiv'](markup));
|
|
} else {
|
|
if (mayRequireCreateElementHack) {
|
|
// The document.createElement('my-element') trick to enable custom elements in IE6-8
|
|
// only works if we assign innerHTML on an element associated with that document.
|
|
documentContext.body.appendChild(div);
|
|
}
|
|
|
|
div.innerHTML = markup;
|
|
|
|
if (mayRequireCreateElementHack) {
|
|
div.parentNode.removeChild(div);
|
|
}
|
|
}
|
|
|
|
// Move to the right depth
|
|
while (depth--)
|
|
div = div.lastChild;
|
|
|
|
return ko.utils.makeArray(div.lastChild.childNodes);
|
|
}
|
|
|
|
function jQueryHtmlParse(html, documentContext) {
|
|
// jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
|
|
if (jQueryInstance['parseHTML']) {
|
|
return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null
|
|
} else {
|
|
// For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
|
|
var elems = jQueryInstance['clean']([html], documentContext);
|
|
|
|
// As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
|
|
// Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
|
|
// Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
|
|
if (elems && elems[0]) {
|
|
// Find the top-most parent element that's a direct child of a document fragment
|
|
var elem = elems[0];
|
|
while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
|
|
elem = elem.parentNode;
|
|
// ... then detach it
|
|
if (elem.parentNode)
|
|
elem.parentNode.removeChild(elem);
|
|
}
|
|
|
|
return elems;
|
|
}
|
|
}
|
|
|
|
ko.utils.parseHtmlFragment = function(html, documentContext) {
|
|
return jQueryInstance ?
|
|
jQueryHtmlParse(html, documentContext) : // As below, benefit from jQuery's optimisations where possible
|
|
simpleHtmlParse(html, documentContext); // ... otherwise, this simple logic will do in most common cases.
|
|
};
|
|
|
|
ko.utils.parseHtmlForTemplateNodes = function(html, documentContext) {
|
|
var nodes = ko.utils.parseHtmlFragment(html, documentContext);
|
|
return (nodes.length && nodes[0].parentElement) || ko.utils.moveCleanedNodesToContainerElement(nodes);
|
|
};
|
|
|
|
ko.utils.setHtml = function(node, html) {
|
|
ko.utils.emptyDomNode(node);
|
|
|
|
// There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
|
|
html = ko.utils.unwrapObservable(html);
|
|
|
|
if ((html !== null) && (html !== undefined)) {
|
|
if (typeof html != 'string')
|
|
html = html.toString();
|
|
|
|
// jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
|
|
// for example <tr> elements which are not normally allowed to exist on their own.
|
|
// If you've referenced jQuery we'll use that rather than duplicating its code.
|
|
if (jQueryInstance) {
|
|
jQueryInstance(node)['html'](html);
|
|
} else {
|
|
// ... otherwise, use KO's own parsing logic.
|
|
var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);
|
|
for (var i = 0; i < parsedNodes.length; i++)
|
|
node.appendChild(parsedNodes[i]);
|
|
}
|
|
}
|
|
};
|
|
})();
|
|
|
|
ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
|
|
ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
|
|
|
|
ko.memoization = (function () {
|
|
var memos = {};
|
|
|
|
function randomMax8HexChars() {
|
|
return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
|
|
}
|
|
function generateRandomId() {
|
|
return randomMax8HexChars() + randomMax8HexChars();
|
|
}
|
|
function findMemoNodes(rootNode, appendToArray) {
|
|
if (!rootNode)
|
|
return;
|
|
if (rootNode.nodeType == 8) {
|
|
var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
|
|
if (memoId != null)
|
|
appendToArray.push({ domNode: rootNode, memoId: memoId });
|
|
} else if (rootNode.nodeType == 1) {
|
|
for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
|
|
findMemoNodes(childNodes[i], appendToArray);
|
|
}
|
|
}
|
|
|
|
return {
|
|
memoize: function (callback) {
|
|
if (typeof callback != "function")
|
|
throw new Error("You can only pass a function to ko.memoization.memoize()");
|
|
var memoId = generateRandomId();
|
|
memos[memoId] = callback;
|
|
return "<!--[ko_memo:" + memoId + "]-->";
|
|
},
|
|
|
|
unmemoize: function (memoId, callbackParams) {
|
|
var callback = memos[memoId];
|
|
if (callback === undefined)
|
|
throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
|
|
try {
|
|
callback.apply(null, callbackParams || []);
|
|
return true;
|
|
}
|
|
finally { delete memos[memoId]; }
|
|
},
|
|
|
|
unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
|
|
var memos = [];
|
|
findMemoNodes(domNode, memos);
|
|
for (var i = 0, j = memos.length; i < j; i++) {
|
|
var node = memos[i].domNode;
|
|
var combinedParams = [node];
|
|
if (extraCallbackParamsArray)
|
|
ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
|
|
ko.memoization.unmemoize(memos[i].memoId, combinedParams);
|
|
node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
|
|
if (node.parentNode)
|
|
node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
|
|
}
|
|
},
|
|
|
|
parseMemoText: function (memoText) {
|
|
var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
|
|
return match ? match[1] : null;
|
|
}
|
|
};
|
|
})();
|
|
|
|
ko.exportSymbol('memoization', ko.memoization);
|
|
ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
|
|
ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
|
|
ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
|
|
ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
|
|
ko.tasks = (function () {
|
|
var scheduler,
|
|
taskQueue = [],
|
|
taskQueueLength = 0,
|
|
nextHandle = 1,
|
|
nextIndexToProcess = 0;
|
|
|
|
if (window['MutationObserver']) {
|
|
// Chrome 27+, Firefox 14+, IE 11+, Opera 15+, Safari 6.1+
|
|
// From https://github.com/petkaantonov/bluebird * Copyright (c) 2014 Petka Antonov * License: MIT
|
|
scheduler = (function (callback) {
|
|
var div = document.createElement("div");
|
|
new MutationObserver(callback).observe(div, {attributes: true});
|
|
return function () { div.classList.toggle("foo"); };
|
|
})(scheduledProcess);
|
|
} else if (document && "onreadystatechange" in document.createElement("script")) {
|
|
// IE 6-10
|
|
// From https://github.com/YuzuJS/setImmediate * Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola * License: MIT
|
|
scheduler = function (callback) {
|
|
var script = document.createElement("script");
|
|
script.onreadystatechange = function () {
|
|
script.onreadystatechange = null;
|
|
document.documentElement.removeChild(script);
|
|
script = null;
|
|
callback();
|
|
};
|
|
document.documentElement.appendChild(script);
|
|
};
|
|
} else {
|
|
scheduler = function (callback) {
|
|
setTimeout(callback, 0);
|
|
};
|
|
}
|
|
|
|
function processTasks() {
|
|
if (taskQueueLength) {
|
|
// Each mark represents the end of a logical group of tasks and the number of these groups is
|
|
// limited to prevent unchecked recursion.
|
|
var mark = taskQueueLength, countMarks = 0;
|
|
|
|
// nextIndexToProcess keeps track of where we are in the queue; processTasks can be called recursively without issue
|
|
for (var task; nextIndexToProcess < taskQueueLength; ) {
|
|
if (task = taskQueue[nextIndexToProcess++]) {
|
|
if (nextIndexToProcess > mark) {
|
|
if (++countMarks >= 5000) {
|
|
nextIndexToProcess = taskQueueLength; // skip all tasks remaining in the queue since any of them could be causing the recursion
|
|
ko.utils.deferError(Error("'Too much recursion' after processing " + countMarks + " task groups."));
|
|
break;
|
|
}
|
|
mark = taskQueueLength;
|
|
}
|
|
try {
|
|
task();
|
|
} catch (ex) {
|
|
ko.utils.deferError(ex);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function scheduledProcess() {
|
|
processTasks();
|
|
|
|
// Reset the queue
|
|
nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
|
|
}
|
|
|
|
function scheduleTaskProcessing() {
|
|
ko.tasks['scheduler'](scheduledProcess);
|
|
}
|
|
|
|
var tasks = {
|
|
'scheduler': scheduler, // Allow overriding the scheduler
|
|
|
|
schedule: function (func) {
|
|
if (!taskQueueLength) {
|
|
scheduleTaskProcessing();
|
|
}
|
|
|
|
taskQueue[taskQueueLength++] = func;
|
|
return nextHandle++;
|
|
},
|
|
|
|
cancel: function (handle) {
|
|
var index = handle - (nextHandle - taskQueueLength);
|
|
if (index >= nextIndexToProcess && index < taskQueueLength) {
|
|
taskQueue[index] = null;
|
|
}
|
|
},
|
|
|
|
// For testing only: reset the queue and return the previous queue length
|
|
'resetForTesting': function () {
|
|
var length = taskQueueLength - nextIndexToProcess;
|
|
nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
|
|
return length;
|
|
},
|
|
|
|
runEarly: processTasks
|
|
};
|
|
|
|
return tasks;
|
|
})();
|
|
|
|
ko.exportSymbol('tasks', ko.tasks);
|
|
ko.exportSymbol('tasks.schedule', ko.tasks.schedule);
|
|
//ko.exportSymbol('tasks.cancel', ko.tasks.cancel); "cancel" isn't minified
|
|
ko.exportSymbol('tasks.runEarly', ko.tasks.runEarly);
|
|
ko.extenders = {
|
|
'throttle': function(target, timeout) {
|
|
// Throttling means two things:
|
|
|
|
// (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
|
|
// notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
|
|
target['throttleEvaluation'] = timeout;
|
|
|
|
// (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
|
|
// so the target cannot change value synchronously or faster than a certain rate
|
|
var writeTimeoutInstance = null;
|
|
return ko.dependentObservable({
|
|
'read': target,
|
|
'write': function(value) {
|
|
clearTimeout(writeTimeoutInstance);
|
|
writeTimeoutInstance = ko.utils.setTimeout(function() {
|
|
target(value);
|
|
}, timeout);
|
|
}
|
|
});
|
|
},
|
|
|
|
'rateLimit': function(target, options) {
|
|
var timeout, method, limitFunction;
|
|
|
|
if (typeof options == 'number') {
|
|
timeout = options;
|
|
} else {
|
|
timeout = options['timeout'];
|
|
method = options['method'];
|
|
}
|
|
|
|
// rateLimit supersedes deferred updates
|
|
target._deferUpdates = false;
|
|
|
|
limitFunction = typeof method == 'function' ? method : method == 'notifyWhenChangesStop' ? debounce : throttle;
|
|
target.limit(function(callback) {
|
|
return limitFunction(callback, timeout, options);
|
|
});
|
|
},
|
|
|
|
'deferred': function(target, options) {
|
|
if (options !== true) {
|
|
throw new Error('The \'deferred\' extender only accepts the value \'true\', because it is not supported to turn deferral off once enabled.')
|
|
}
|
|
|
|
if (!target._deferUpdates) {
|
|
target._deferUpdates = true;
|
|
target.limit(function (callback) {
|
|
var handle,
|
|
ignoreUpdates = false;
|
|
return function () {
|
|
if (!ignoreUpdates) {
|
|
ko.tasks.cancel(handle);
|
|
handle = ko.tasks.schedule(callback);
|
|
|
|
try {
|
|
ignoreUpdates = true;
|
|
target['notifySubscribers'](undefined, 'dirty');
|
|
} finally {
|
|
ignoreUpdates = false;
|
|
}
|
|
}
|
|
};
|
|
});
|
|
}
|
|
},
|
|
|
|
'notify': function(target, notifyWhen) {
|
|
target["equalityComparer"] = notifyWhen == "always" ?
|
|
null : // null equalityComparer means to always notify
|
|
valuesArePrimitiveAndEqual;
|
|
}
|
|
};
|
|
|
|
var primitiveTypes = { 'undefined':1, 'boolean':1, 'number':1, 'string':1 };
|
|
function valuesArePrimitiveAndEqual(a, b) {
|
|
var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
|
|
return oldValueIsPrimitive ? (a === b) : false;
|
|
}
|
|
|
|
function throttle(callback, timeout) {
|
|
var timeoutInstance;
|
|
return function () {
|
|
if (!timeoutInstance) {
|
|
timeoutInstance = ko.utils.setTimeout(function () {
|
|
timeoutInstance = undefined;
|
|
callback();
|
|
}, timeout);
|
|
}
|
|
};
|
|
}
|
|
|
|
function debounce(callback, timeout) {
|
|
var timeoutInstance;
|
|
return function () {
|
|
clearTimeout(timeoutInstance);
|
|
timeoutInstance = ko.utils.setTimeout(callback, timeout);
|
|
};
|
|
}
|
|
|
|
function applyExtenders(requestedExtenders) {
|
|
var target = this;
|
|
if (requestedExtenders) {
|
|
ko.utils.objectForEach(requestedExtenders, function(key, value) {
|
|
var extenderHandler = ko.extenders[key];
|
|
if (typeof extenderHandler == 'function') {
|
|
target = extenderHandler(target, value) || target;
|
|
}
|
|
});
|
|
}
|
|
return target;
|
|
}
|
|
|
|
ko.exportSymbol('extenders', ko.extenders);
|
|
|
|
ko.subscription = function (target, callback, disposeCallback) {
|
|
this._target = target;
|
|
this._callback = callback;
|
|
this._disposeCallback = disposeCallback;
|
|
this._isDisposed = false;
|
|
this._node = null;
|
|
this._domNodeDisposalCallback = null;
|
|
ko.exportProperty(this, 'dispose', this.dispose);
|
|
ko.exportProperty(this, 'disposeWhenNodeIsRemoved', this.disposeWhenNodeIsRemoved);
|
|
};
|
|
ko.subscription.prototype.dispose = function () {
|
|
var self = this;
|
|
if (!self._isDisposed) {
|
|
if (self._domNodeDisposalCallback) {
|
|
ko.utils.domNodeDisposal.removeDisposeCallback(self._node, self._domNodeDisposalCallback);
|
|
}
|
|
self._isDisposed = true;
|
|
self._disposeCallback();
|
|
|
|
self._target = self._callback = self._disposeCallback = self._node = self._domNodeDisposalCallback = null;
|
|
}
|
|
};
|
|
ko.subscription.prototype.disposeWhenNodeIsRemoved = function (node) {
|
|
this._node = node;
|
|
ko.utils.domNodeDisposal.addDisposeCallback(node, this._domNodeDisposalCallback = this.dispose.bind(this));
|
|
};
|
|
|
|
ko.subscribable = function () {
|
|
ko.utils.setPrototypeOfOrExtend(this, ko_subscribable_fn);
|
|
ko_subscribable_fn.init(this);
|
|
}
|
|
|
|
var defaultEvent = "change";
|
|
|
|
// Moved out of "limit" to avoid the extra closure
|
|
function limitNotifySubscribers(value, event) {
|
|
if (!event || event === defaultEvent) {
|
|
this._limitChange(value);
|
|
} else if (event === 'beforeChange') {
|
|
this._limitBeforeChange(value);
|
|
} else {
|
|
this._origNotifySubscribers(value, event);
|
|
}
|
|
}
|
|
|
|
var ko_subscribable_fn = {
|
|
init: function(instance) {
|
|
instance._subscriptions = { "change": [] };
|
|
instance._versionNumber = 1;
|
|
},
|
|
|
|
subscribe: function (callback, callbackTarget, event) {
|
|
var self = this;
|
|
|
|
event = event || defaultEvent;
|
|
var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
|
|
|
|
var subscription = new ko.subscription(self, boundCallback, function () {
|
|
ko.utils.arrayRemoveItem(self._subscriptions[event], subscription);
|
|
if (self.afterSubscriptionRemove)
|
|
self.afterSubscriptionRemove(event);
|
|
});
|
|
|
|
if (self.beforeSubscriptionAdd)
|
|
self.beforeSubscriptionAdd(event);
|
|
|
|
if (!self._subscriptions[event])
|
|
self._subscriptions[event] = [];
|
|
self._subscriptions[event].push(subscription);
|
|
|
|
return subscription;
|
|
},
|
|
|
|
"notifySubscribers": function (valueToNotify, event) {
|
|
event = event || defaultEvent;
|
|
if (event === defaultEvent) {
|
|
this.updateVersion();
|
|
}
|
|
if (this.hasSubscriptionsForEvent(event)) {
|
|
var subs = event === defaultEvent && this._changeSubscriptions || this._subscriptions[event].slice(0);
|
|
try {
|
|
ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined)
|
|
for (var i = 0, subscription; subscription = subs[i]; ++i) {
|
|
// In case a subscription was disposed during the arrayForEach cycle, check
|
|
// for isDisposed on each subscription before invoking its callback
|
|
if (!subscription._isDisposed)
|
|
subscription._callback(valueToNotify);
|
|
}
|
|
} finally {
|
|
ko.dependencyDetection.end(); // End suppressing dependency detection
|
|
}
|
|
}
|
|
},
|
|
|
|
getVersion: function () {
|
|
return this._versionNumber;
|
|
},
|
|
|
|
hasChanged: function (versionToCheck) {
|
|
return this.getVersion() !== versionToCheck;
|
|
},
|
|
|
|
updateVersion: function () {
|
|
++this._versionNumber;
|
|
},
|
|
|
|
limit: function(limitFunction) {
|
|
var self = this, selfIsObservable = ko.isObservable(self),
|
|
ignoreBeforeChange, notifyNextChange, previousValue, pendingValue, didUpdate,
|
|
beforeChange = 'beforeChange';
|
|
|
|
if (!self._origNotifySubscribers) {
|
|
self._origNotifySubscribers = self["notifySubscribers"];
|
|
self["notifySubscribers"] = limitNotifySubscribers;
|
|
}
|
|
|
|
var finish = limitFunction(function() {
|
|
self._notificationIsPending = false;
|
|
|
|
// If an observable provided a reference to itself, access it to get the latest value.
|
|
// This allows computed observables to delay calculating their value until needed.
|
|
if (selfIsObservable && pendingValue === self) {
|
|
pendingValue = self._evalIfChanged ? self._evalIfChanged() : self();
|
|
}
|
|
var shouldNotify = notifyNextChange || (didUpdate && self.isDifferent(previousValue, pendingValue));
|
|
|
|
didUpdate = notifyNextChange = ignoreBeforeChange = false;
|
|
|
|
if (shouldNotify) {
|
|
self._origNotifySubscribers(previousValue = pendingValue);
|
|
}
|
|
});
|
|
|
|
self._limitChange = function(value, isDirty) {
|
|
if (!isDirty || !self._notificationIsPending) {
|
|
didUpdate = !isDirty;
|
|
}
|
|
self._changeSubscriptions = self._subscriptions[defaultEvent].slice(0);
|
|
self._notificationIsPending = ignoreBeforeChange = true;
|
|
pendingValue = value;
|
|
finish();
|
|
};
|
|
self._limitBeforeChange = function(value) {
|
|
if (!ignoreBeforeChange) {
|
|
previousValue = value;
|
|
self._origNotifySubscribers(value, beforeChange);
|
|
}
|
|
};
|
|
self._recordUpdate = function() {
|
|
didUpdate = true;
|
|
};
|
|
self._notifyNextChangeIfValueIsDifferent = function() {
|
|
if (self.isDifferent(previousValue, self.peek(true /*evaluate*/))) {
|
|
notifyNextChange = true;
|
|
}
|
|
};
|
|
},
|
|
|
|
hasSubscriptionsForEvent: function(event) {
|
|
return this._subscriptions[event] && this._subscriptions[event].length;
|
|
},
|
|
|
|
getSubscriptionsCount: function (event) {
|
|
if (event) {
|
|
return this._subscriptions[event] && this._subscriptions[event].length || 0;
|
|
} else {
|
|
var total = 0;
|
|
ko.utils.objectForEach(this._subscriptions, function(eventName, subscriptions) {
|
|
if (eventName !== 'dirty')
|
|
total += subscriptions.length;
|
|
});
|
|
return total;
|
|
}
|
|
},
|
|
|
|
isDifferent: function(oldValue, newValue) {
|
|
return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);
|
|
},
|
|
|
|
toString: function() {
|
|
return '[object Object]'
|
|
},
|
|
|
|
extend: applyExtenders
|
|
};
|
|
|
|
ko.exportProperty(ko_subscribable_fn, 'init', ko_subscribable_fn.init);
|
|
ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe);
|
|
ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend);
|
|
ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount);
|
|
|
|
// For browsers that support proto assignment, we overwrite the prototype of each
|
|
// observable instance. Since observables are functions, we need Function.prototype
|
|
// to still be in the prototype chain.
|
|
if (ko.utils.canSetPrototype) {
|
|
ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);
|
|
}
|
|
|
|
ko.subscribable['fn'] = ko_subscribable_fn;
|
|
|
|
|
|
ko.isSubscribable = function (instance) {
|
|
return instance != null && typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
|
|
};
|
|
|
|
ko.exportSymbol('subscribable', ko.subscribable);
|
|
ko.exportSymbol('isSubscribable', ko.isSubscribable);
|
|
|
|
ko.computedContext = ko.dependencyDetection = (function () {
|
|
var outerFrames = [],
|
|
currentFrame,
|
|
lastId = 0;
|
|
|
|
// Return a unique ID that can be assigned to an observable for dependency tracking.
|
|
// Theoretically, you could eventually overflow the number storage size, resulting
|
|
// in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53
|
|
// or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would
|
|
// take over 285 years to reach that number.
|
|
// Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html
|
|
function getId() {
|
|
return ++lastId;
|
|
}
|
|
|
|
function begin(options) {
|
|
outerFrames.push(currentFrame);
|
|
currentFrame = options;
|
|
}
|
|
|
|
function end() {
|
|
currentFrame = outerFrames.pop();
|
|
}
|
|
|
|
return {
|
|
begin: begin,
|
|
|
|
end: end,
|
|
|
|
registerDependency: function (subscribable) {
|
|
if (currentFrame) {
|
|
if (!ko.isSubscribable(subscribable))
|
|
throw new Error("Only subscribable things can act as dependencies");
|
|
currentFrame.callback.call(currentFrame.callbackTarget, subscribable, subscribable._id || (subscribable._id = getId()));
|
|
}
|
|
},
|
|
|
|
ignore: function (callback, callbackTarget, callbackArgs) {
|
|
try {
|
|
begin();
|
|
return callback.apply(callbackTarget, callbackArgs || []);
|
|
} finally {
|
|
end();
|
|
}
|
|
},
|
|
|
|
getDependenciesCount: function () {
|
|
if (currentFrame)
|
|
return currentFrame.computed.getDependenciesCount();
|
|
},
|
|
|
|
getDependencies: function () {
|
|
if (currentFrame)
|
|
return currentFrame.computed.getDependencies();
|
|
},
|
|
|
|
isInitial: function() {
|
|
if (currentFrame)
|
|
return currentFrame.isInitial;
|
|
},
|
|
|
|
computed: function() {
|
|
if (currentFrame)
|
|
return currentFrame.computed;
|
|
}
|
|
};
|
|
})();
|
|
|
|
ko.exportSymbol('computedContext', ko.computedContext);
|
|
ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount);
|
|
ko.exportSymbol('computedContext.getDependencies', ko.computedContext.getDependencies);
|
|
ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial);
|
|
ko.exportSymbol('computedContext.registerDependency', ko.computedContext.registerDependency);
|
|
|
|
ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);
|
|
var observableLatestValue = ko.utils.createSymbolOrString('_latestValue');
|
|
|
|
ko.observable = function (initialValue) {
|
|
function observable() {
|
|
if (arguments.length > 0) {
|
|
// Write
|
|
|
|
// Ignore writes if the value hasn't changed
|
|
if (observable.isDifferent(observable[observableLatestValue], arguments[0])) {
|
|
observable.valueWillMutate();
|
|
observable[observableLatestValue] = arguments[0];
|
|
observable.valueHasMutated();
|
|
}
|
|
return this; // Permits chained assignments
|
|
}
|
|
else {
|
|
// Read
|
|
ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
|
|
return observable[observableLatestValue];
|
|
}
|
|
}
|
|
|
|
observable[observableLatestValue] = initialValue;
|
|
|
|
// Inherit from 'subscribable'
|
|
if (!ko.utils.canSetPrototype) {
|
|
// 'subscribable' won't be on the prototype chain unless we put it there directly
|
|
ko.utils.extend(observable, ko.subscribable['fn']);
|
|
}
|
|
ko.subscribable['fn'].init(observable);
|
|
|
|
// Inherit from 'observable'
|
|
ko.utils.setPrototypeOfOrExtend(observable, observableFn);
|
|
|
|
if (ko.options['deferUpdates']) {
|
|
ko.extenders['deferred'](observable, true);
|
|
}
|
|
|
|
return observable;
|
|
}
|
|
|
|
// Define prototype for observables
|
|
var observableFn = {
|
|
'equalityComparer': valuesArePrimitiveAndEqual,
|
|
peek: function() { return this[observableLatestValue]; },
|
|
valueHasMutated: function () {
|
|
this['notifySubscribers'](this[observableLatestValue], 'spectate');
|
|
this['notifySubscribers'](this[observableLatestValue]);
|
|
},
|
|
valueWillMutate: function () { this['notifySubscribers'](this[observableLatestValue], 'beforeChange'); }
|
|
};
|
|
|
|
// Note that for browsers that don't support proto assignment, the
|
|
// inheritance chain is created manually in the ko.observable constructor
|
|
if (ko.utils.canSetPrototype) {
|
|
ko.utils.setPrototypeOf(observableFn, ko.subscribable['fn']);
|
|
}
|
|
|
|
var protoProperty = ko.observable.protoProperty = '__ko_proto__';
|
|
observableFn[protoProperty] = ko.observable;
|
|
|
|
ko.isObservable = function (instance) {
|
|
var proto = typeof instance == 'function' && instance[protoProperty];
|
|
if (proto && proto !== observableFn[protoProperty] && proto !== ko.computed['fn'][protoProperty]) {
|
|
throw Error("Invalid object that looks like an observable; possibly from another Knockout instance");
|
|
}
|
|
return !!proto;
|
|
};
|
|
|
|
ko.isWriteableObservable = function (instance) {
|
|
return (typeof instance == 'function' && (
|
|
(instance[protoProperty] === observableFn[protoProperty]) || // Observable
|
|
(instance[protoProperty] === ko.computed['fn'][protoProperty] && instance.hasWriteFunction))); // Writable computed observable
|
|
};
|
|
|
|
ko.exportSymbol('observable', ko.observable);
|
|
ko.exportSymbol('isObservable', ko.isObservable);
|
|
ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
|
|
ko.exportSymbol('isWritableObservable', ko.isWriteableObservable);
|
|
ko.exportSymbol('observable.fn', observableFn);
|
|
ko.exportProperty(observableFn, 'peek', observableFn.peek);
|
|
ko.exportProperty(observableFn, 'valueHasMutated', observableFn.valueHasMutated);
|
|
ko.exportProperty(observableFn, 'valueWillMutate', observableFn.valueWillMutate);
|
|
ko.observableArray = function (initialValues) {
|
|
initialValues = initialValues || [];
|
|
|
|
if (typeof initialValues != 'object' || !('length' in initialValues))
|
|
throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
|
|
|
|
var result = ko.observable(initialValues);
|
|
ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);
|
|
return result.extend({'trackArrayChanges':true});
|
|
};
|
|
|
|
ko.observableArray['fn'] = {
|
|
'remove': function (valueOrPredicate) {
|
|
var underlyingArray = this.peek();
|
|
var removedValues = [];
|
|
var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
|
|
for (var i = 0; i < underlyingArray.length; i++) {
|
|
var value = underlyingArray[i];
|
|
if (predicate(value)) {
|
|
if (removedValues.length === 0) {
|
|
this.valueWillMutate();
|
|
}
|
|
if (underlyingArray[i] !== value) {
|
|
throw Error("Array modified during remove; cannot remove item");
|
|
}
|
|
removedValues.push(value);
|
|
underlyingArray.splice(i, 1);
|
|
i--;
|
|
}
|
|
}
|
|
if (removedValues.length) {
|
|
this.valueHasMutated();
|
|
}
|
|
return removedValues;
|
|
},
|
|
|
|
'removeAll': function (arrayOfValues) {
|
|
// If you passed zero args, we remove everything
|
|
if (arrayOfValues === undefined) {
|
|
var underlyingArray = this.peek();
|
|
var allValues = underlyingArray.slice(0);
|
|
this.valueWillMutate();
|
|
underlyingArray.splice(0, underlyingArray.length);
|
|
this.valueHasMutated();
|
|
return allValues;
|
|
}
|
|
// If you passed an arg, we interpret it as an array of entries to remove
|
|
if (!arrayOfValues)
|
|
return [];
|
|
return this['remove'](function (value) {
|
|
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
|
|
});
|
|
},
|
|
|
|
'destroy': function (valueOrPredicate) {
|
|
var underlyingArray = this.peek();
|
|
var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
|
|
this.valueWillMutate();
|
|
for (var i = underlyingArray.length - 1; i >= 0; i--) {
|
|
var value = underlyingArray[i];
|
|
if (predicate(value))
|
|
value["_destroy"] = true;
|
|
}
|
|
this.valueHasMutated();
|
|
},
|
|
|
|
'destroyAll': function (arrayOfValues) {
|
|
// If you passed zero args, we destroy everything
|
|
if (arrayOfValues === undefined)
|
|
return this['destroy'](function() { return true });
|
|
|
|
// If you passed an arg, we interpret it as an array of entries to destroy
|
|
if (!arrayOfValues)
|
|
return [];
|
|
return this['destroy'](function (value) {
|
|
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
|
|
});
|
|
},
|
|
|
|
'indexOf': function (item) {
|
|
var underlyingArray = this();
|
|
return ko.utils.arrayIndexOf(underlyingArray, item);
|
|
},
|
|
|
|
'replace': function(oldItem, newItem) {
|
|
var index = this['indexOf'](oldItem);
|
|
if (index >= 0) {
|
|
this.valueWillMutate();
|
|
this.peek()[index] = newItem;
|
|
this.valueHasMutated();
|
|
}
|
|
},
|
|
|
|
'sorted': function (compareFunction) {
|
|
var arrayCopy = this().slice(0);
|
|
return compareFunction ? arrayCopy.sort(compareFunction) : arrayCopy.sort();
|
|
},
|
|
|
|
'reversed': function () {
|
|
return this().slice(0).reverse();
|
|
}
|
|
};
|
|
|
|
// Note that for browsers that don't support proto assignment, the
|
|
// inheritance chain is created manually in the ko.observableArray constructor
|
|
if (ko.utils.canSetPrototype) {
|
|
ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
|
|
}
|
|
|
|
// Populate ko.observableArray.fn with read/write functions from native arrays
|
|
// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
|
|
// because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
|
|
ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
|
|
ko.observableArray['fn'][methodName] = function () {
|
|
// Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
|
|
// (for consistency with mutating regular observables)
|
|
var underlyingArray = this.peek();
|
|
this.valueWillMutate();
|
|
this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments);
|
|
var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
|
|
this.valueHasMutated();
|
|
// The native sort and reverse methods return a reference to the array, but it makes more sense to return the observable array instead.
|
|
return methodCallResult === underlyingArray ? this : methodCallResult;
|
|
};
|
|
});
|
|
|
|
// Populate ko.observableArray.fn with read-only functions from native arrays
|
|
ko.utils.arrayForEach(["slice"], function (methodName) {
|
|
ko.observableArray['fn'][methodName] = function () {
|
|
var underlyingArray = this();
|
|
return underlyingArray[methodName].apply(underlyingArray, arguments);
|
|
};
|
|
});
|
|
|
|
ko.isObservableArray = function (instance) {
|
|
return ko.isObservable(instance)
|
|
&& typeof instance["remove"] == "function"
|
|
&& typeof instance["push"] == "function";
|
|
};
|
|
|
|
ko.exportSymbol('observableArray', ko.observableArray);
|
|
ko.exportSymbol('isObservableArray', ko.isObservableArray);
|
|
var arrayChangeEventName = 'arrayChange';
|
|
ko.extenders['trackArrayChanges'] = function(target, options) {
|
|
// Use the provided options--each call to trackArrayChanges overwrites the previously set options
|
|
target.compareArrayOptions = {};
|
|
if (options && typeof options == "object") {
|
|
ko.utils.extend(target.compareArrayOptions, options);
|
|
}
|
|
target.compareArrayOptions['sparse'] = true;
|
|
|
|
// Only modify the target observable once
|
|
if (target.cacheDiffForKnownOperation) {
|
|
return;
|
|
}
|
|
var trackingChanges = false,
|
|
cachedDiff = null,
|
|
changeSubscription,
|
|
spectateSubscription,
|
|
pendingChanges = 0,
|
|
previousContents,
|
|
underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd,
|
|
underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove;
|
|
|
|
// Watch "subscribe" calls, and for array change events, ensure change tracking is enabled
|
|
target.beforeSubscriptionAdd = function (event) {
|
|
if (underlyingBeforeSubscriptionAddFunction) {
|
|
underlyingBeforeSubscriptionAddFunction.call(target, event);
|
|
}
|
|
if (event === arrayChangeEventName) {
|
|
trackChanges();
|
|
}
|
|
};
|
|
// Watch "dispose" calls, and for array change events, ensure change tracking is disabled when all are disposed
|
|
target.afterSubscriptionRemove = function (event) {
|
|
if (underlyingAfterSubscriptionRemoveFunction) {
|
|
underlyingAfterSubscriptionRemoveFunction.call(target, event);
|
|
}
|
|
if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) {
|
|
if (changeSubscription) {
|
|
changeSubscription.dispose();
|
|
}
|
|
if (spectateSubscription) {
|
|
spectateSubscription.dispose();
|
|
}
|
|
spectateSubscription = changeSubscription = null;
|
|
trackingChanges = false;
|
|
previousContents = undefined;
|
|
}
|
|
};
|
|
|
|
function trackChanges() {
|
|
if (trackingChanges) {
|
|
// Whenever there's a new subscription and there are pending notifications, make sure all previous
|
|
// subscriptions are notified of the change so that all subscriptions are in sync.
|
|
notifyChanges();
|
|
return;
|
|
}
|
|
|
|
trackingChanges = true;
|
|
|
|
// Track how many times the array actually changed value
|
|
spectateSubscription = target.subscribe(function () {
|
|
++pendingChanges;
|
|
}, null, "spectate");
|
|
|
|
// Each time the array changes value, capture a clone so that on the next
|
|
// change it's possible to produce a diff
|
|
previousContents = [].concat(target.peek() || []);
|
|
cachedDiff = null;
|
|
changeSubscription = target.subscribe(notifyChanges);
|
|
|
|
function notifyChanges() {
|
|
if (pendingChanges) {
|
|
// Make a copy of the current contents and ensure it's an array
|
|
var currentContents = [].concat(target.peek() || []), changes;
|
|
|
|
// Compute the diff and issue notifications, but only if someone is listening
|
|
if (target.hasSubscriptionsForEvent(arrayChangeEventName)) {
|
|
changes = getChanges(previousContents, currentContents);
|
|
}
|
|
|
|
// Eliminate references to the old, removed items, so they can be GCed
|
|
previousContents = currentContents;
|
|
cachedDiff = null;
|
|
pendingChanges = 0;
|
|
|
|
if (changes && changes.length) {
|
|
target['notifySubscribers'](changes, arrayChangeEventName);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function getChanges(previousContents, currentContents) {
|
|
// We try to re-use cached diffs.
|
|
// The scenarios where pendingChanges > 1 are when using rate limiting or deferred updates,
|
|
// which without this check would not be compatible with arrayChange notifications. Normally,
|
|
// notifications are issued immediately so we wouldn't be queueing up more than one.
|
|
if (!cachedDiff || pendingChanges > 1) {
|
|
cachedDiff = ko.utils.compareArrays(previousContents, currentContents, target.compareArrayOptions);
|
|
}
|
|
|
|
return cachedDiff;
|
|
}
|
|
|
|
target.cacheDiffForKnownOperation = function(rawArray, operationName, args) {
|
|
// Only run if we're currently tracking changes for this observable array
|
|
// and there aren't any pending deferred notifications.
|
|
if (!trackingChanges || pendingChanges) {
|
|
return;
|
|
}
|
|
var diff = [],
|
|
arrayLength = rawArray.length,
|
|
argsLength = args.length,
|
|
offset = 0;
|
|
|
|
function pushDiff(status, value, index) {
|
|
return diff[diff.length] = { 'status': status, 'value': value, 'index': index };
|
|
}
|
|
switch (operationName) {
|
|
case 'push':
|
|
offset = arrayLength;
|
|
case 'unshift':
|
|
for (var index = 0; index < argsLength; index++) {
|
|
pushDiff('added', args[index], offset + index);
|
|
}
|
|
break;
|
|
|
|
case 'pop':
|
|
offset = arrayLength - 1;
|
|
case 'shift':
|
|
if (arrayLength) {
|
|
pushDiff('deleted', rawArray[offset], offset);
|
|
}
|
|
break;
|
|
|
|
case 'splice':
|
|
// Negative start index means 'from end of array'. After that we clamp to [0...arrayLength].
|
|
// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
|
|
var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength),
|
|
endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength),
|
|
endAddIndex = startIndex + argsLength - 2,
|
|
endIndex = Math.max(endDeleteIndex, endAddIndex),
|
|
additions = [], deletions = [];
|
|
for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) {
|
|
if (index < endDeleteIndex)
|
|
deletions.push(pushDiff('deleted', rawArray[index], index));
|
|
if (index < endAddIndex)
|
|
additions.push(pushDiff('added', args[argsIndex], index));
|
|
}
|
|
ko.utils.findMovesInArrayComparison(deletions, additions);
|
|
break;
|
|
|
|
default:
|
|
return;
|
|
}
|
|
cachedDiff = diff;
|
|
};
|
|
};
|
|
var computedState = ko.utils.createSymbolOrString('_state');
|
|
|
|
ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
|
|
if (typeof evaluatorFunctionOrOptions === "object") {
|
|
// Single-parameter syntax - everything is on this "options" param
|
|
options = evaluatorFunctionOrOptions;
|
|
} else {
|
|
// Multi-parameter syntax - construct the options according to the params passed
|
|
options = options || {};
|
|
if (evaluatorFunctionOrOptions) {
|
|
options["read"] = evaluatorFunctionOrOptions;
|
|
}
|
|
}
|
|
if (typeof options["read"] != "function")
|
|
throw Error("Pass a function that returns the value of the ko.computed");
|
|
|
|
var writeFunction = options["write"];
|
|
var state = {
|
|
latestValue: undefined,
|
|
isStale: true,
|
|
isDirty: true,
|
|
isBeingEvaluated: false,
|
|
suppressDisposalUntilDisposeWhenReturnsFalse: false,
|
|
isDisposed: false,
|
|
pure: false,
|
|
isSleeping: false,
|
|
readFunction: options["read"],
|
|
evaluatorFunctionTarget: evaluatorFunctionTarget || options["owner"],
|
|
disposeWhenNodeIsRemoved: options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
|
|
disposeWhen: options["disposeWhen"] || options.disposeWhen,
|
|
domNodeDisposalCallback: null,
|
|
dependencyTracking: {},
|
|
dependenciesCount: 0,
|
|
evaluationTimeoutInstance: null
|
|
};
|
|
|
|
function computedObservable() {
|
|
if (arguments.length > 0) {
|
|
if (typeof writeFunction === "function") {
|
|
// Writing a value
|
|
writeFunction.apply(state.evaluatorFunctionTarget, arguments);
|
|
} else {
|
|
throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
|
|
}
|
|
return this; // Permits chained assignments
|
|
} else {
|
|
// Reading the value
|
|
if (!state.isDisposed) {
|
|
ko.dependencyDetection.registerDependency(computedObservable);
|
|
}
|
|
if (state.isDirty || (state.isSleeping && computedObservable.haveDependenciesChanged())) {
|
|
computedObservable.evaluateImmediate();
|
|
}
|
|
return state.latestValue;
|
|
}
|
|
}
|
|
|
|
computedObservable[computedState] = state;
|
|
computedObservable.hasWriteFunction = typeof writeFunction === "function";
|
|
|
|
// Inherit from 'subscribable'
|
|
if (!ko.utils.canSetPrototype) {
|
|
// 'subscribable' won't be on the prototype chain unless we put it there directly
|
|
ko.utils.extend(computedObservable, ko.subscribable['fn']);
|
|
}
|
|
ko.subscribable['fn'].init(computedObservable);
|
|
|
|
// Inherit from 'computed'
|
|
ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn);
|
|
|
|
if (options['pure']) {
|
|
state.pure = true;
|
|
state.isSleeping = true; // Starts off sleeping; will awake on the first subscription
|
|
ko.utils.extend(computedObservable, pureComputedOverrides);
|
|
} else if (options['deferEvaluation']) {
|
|
ko.utils.extend(computedObservable, deferEvaluationOverrides);
|
|
}
|
|
|
|
if (ko.options['deferUpdates']) {
|
|
ko.extenders['deferred'](computedObservable, true);
|
|
}
|
|
|
|
if (DEBUG) {
|
|
// #1731 - Aid debugging by exposing the computed's options
|
|
computedObservable["_options"] = options;
|
|
}
|
|
|
|
if (state.disposeWhenNodeIsRemoved) {
|
|
// Since this computed is associated with a DOM node, and we don't want to dispose the computed
|
|
// until the DOM node is *removed* from the document (as opposed to never having been in the document),
|
|
// we'll prevent disposal until "disposeWhen" first returns false.
|
|
state.suppressDisposalUntilDisposeWhenReturnsFalse = true;
|
|
|
|
// disposeWhenNodeIsRemoved: true can be used to opt into the "only dispose after first false result"
|
|
// behaviour even if there's no specific node to watch. In that case, clear the option so we don't try
|
|
// to watch for a non-node's disposal. This technique is intended for KO's internal use only and shouldn't
|
|
// be documented or used by application code, as it's likely to change in a future version of KO.
|
|
if (!state.disposeWhenNodeIsRemoved.nodeType) {
|
|
state.disposeWhenNodeIsRemoved = null;
|
|
}
|
|
}
|
|
|
|
// Evaluate, unless sleeping or deferEvaluation is true
|
|
if (!state.isSleeping && !options['deferEvaluation']) {
|
|
computedObservable.evaluateImmediate();
|
|
}
|
|
|
|
// Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is
|
|
// removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose).
|
|
if (state.disposeWhenNodeIsRemoved && computedObservable.isActive()) {
|
|
ko.utils.domNodeDisposal.addDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback = function () {
|
|
computedObservable.dispose();
|
|
});
|
|
}
|
|
|
|
return computedObservable;
|
|
};
|
|
|
|
// Utility function that disposes a given dependencyTracking entry
|
|
function computedDisposeDependencyCallback(id, entryToDispose) {
|
|
if (entryToDispose !== null && entryToDispose.dispose) {
|
|
entryToDispose.dispose();
|
|
}
|
|
}
|
|
|
|
// This function gets called each time a dependency is detected while evaluating a computed.
|
|
// It's factored out as a shared function to avoid creating unnecessary function instances during evaluation.
|
|
function computedBeginDependencyDetectionCallback(subscribable, id) {
|
|
var computedObservable = this.computedObservable,
|
|
state = computedObservable[computedState];
|
|
if (!state.isDisposed) {
|
|
if (this.disposalCount && this.disposalCandidates[id]) {
|
|
// Don't want to dispose this subscription, as it's still being used
|
|
computedObservable.addDependencyTracking(id, subscribable, this.disposalCandidates[id]);
|
|
this.disposalCandidates[id] = null; // No need to actually delete the property - disposalCandidates is a transient object anyway
|
|
--this.disposalCount;
|
|
} else if (!state.dependencyTracking[id]) {
|
|
// Brand new subscription - add it
|
|
computedObservable.addDependencyTracking(id, subscribable, state.isSleeping ? { _target: subscribable } : computedObservable.subscribeToDependency(subscribable));
|
|
}
|
|
// If the observable we've accessed has a pending notification, ensure we get notified of the actual final value (bypass equality checks)
|
|
if (subscribable._notificationIsPending) {
|
|
subscribable._notifyNextChangeIfValueIsDifferent();
|
|
}
|
|
}
|
|
}
|
|
|
|
var computedFn = {
|
|
"equalityComparer": valuesArePrimitiveAndEqual,
|
|
getDependenciesCount: function () {
|
|
return this[computedState].dependenciesCount;
|
|
},
|
|
getDependencies: function () {
|
|
var dependencyTracking = this[computedState].dependencyTracking, dependentObservables = [];
|
|
|
|
ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
|
|
dependentObservables[dependency._order] = dependency._target;
|
|
});
|
|
|
|
return dependentObservables;
|
|
},
|
|
hasAncestorDependency: function (obs) {
|
|
if (!this[computedState].dependenciesCount) {
|
|
return false;
|
|
}
|
|
var dependencies = this.getDependencies();
|
|
if (ko.utils.arrayIndexOf(dependencies, obs) !== -1) {
|
|
return true;
|
|
}
|
|
return !!ko.utils.arrayFirst(dependencies, function (dep) {
|
|
return dep.hasAncestorDependency && dep.hasAncestorDependency(obs);
|
|
});
|
|
},
|
|
addDependencyTracking: function (id, target, trackingObj) {
|
|
if (this[computedState].pure && target === this) {
|
|
throw Error("A 'pure' computed must not be called recursively");
|
|
}
|
|
|
|
this[computedState].dependencyTracking[id] = trackingObj;
|
|
trackingObj._order = this[computedState].dependenciesCount++;
|
|
trackingObj._version = target.getVersion();
|
|
},
|
|
haveDependenciesChanged: function () {
|
|
var id, dependency, dependencyTracking = this[computedState].dependencyTracking;
|
|
for (id in dependencyTracking) {
|
|
if (Object.prototype.hasOwnProperty.call(dependencyTracking, id)) {
|
|
dependency = dependencyTracking[id];
|
|
if ((this._evalDelayed && dependency._target._notificationIsPending) || dependency._target.hasChanged(dependency._version)) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
},
|
|
markDirty: function () {
|
|
// Process "dirty" events if we can handle delayed notifications
|
|
if (this._evalDelayed && !this[computedState].isBeingEvaluated) {
|
|
this._evalDelayed(false /*isChange*/);
|
|
}
|
|
},
|
|
isActive: function () {
|
|
var state = this[computedState];
|
|
return state.isDirty || state.dependenciesCount > 0;
|
|
},
|
|
respondToChange: function () {
|
|
// Ignore "change" events if we've already scheduled a delayed notification
|
|
if (!this._notificationIsPending) {
|
|
this.evaluatePossiblyAsync();
|
|
} else if (this[computedState].isDirty) {
|
|
this[computedState].isStale = true;
|
|
}
|
|
},
|
|
subscribeToDependency: function (target) {
|
|
if (target._deferUpdates) {
|
|
var dirtySub = target.subscribe(this.markDirty, this, 'dirty'),
|
|
changeSub = target.subscribe(this.respondToChange, this);
|
|
return {
|
|
_target: target,
|
|
dispose: function () {
|
|
dirtySub.dispose();
|
|
changeSub.dispose();
|
|
}
|
|
};
|
|
} else {
|
|
return target.subscribe(this.evaluatePossiblyAsync, this);
|
|
}
|
|
},
|
|
evaluatePossiblyAsync: function () {
|
|
var computedObservable = this,
|
|
throttleEvaluationTimeout = computedObservable['throttleEvaluation'];
|
|
if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
|
|
clearTimeout(this[computedState].evaluationTimeoutInstance);
|
|
this[computedState].evaluationTimeoutInstance = ko.utils.setTimeout(function () {
|
|
computedObservable.evaluateImmediate(true /*notifyChange*/);
|
|
}, throttleEvaluationTimeout);
|
|
} else if (computedObservable._evalDelayed) {
|
|
computedObservable._evalDelayed(true /*isChange*/);
|
|
} else {
|
|
computedObservable.evaluateImmediate(true /*notifyChange*/);
|
|
}
|
|
},
|
|
evaluateImmediate: function (notifyChange) {
|
|
var computedObservable = this,
|
|
state = computedObservable[computedState],
|
|
disposeWhen = state.disposeWhen,
|
|
changed = false;
|
|
|
|
if (state.isBeingEvaluated) {
|
|
// If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
|
|
// This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
|
|
// certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
|
|
// their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
|
|
return;
|
|
}
|
|
|
|
// Do not evaluate (and possibly capture new dependencies) if disposed
|
|
if (state.isDisposed) {
|
|
return;
|
|
}
|
|
|
|
if (state.disposeWhenNodeIsRemoved && !ko.utils.domNodeIsAttachedToDocument(state.disposeWhenNodeIsRemoved) || disposeWhen && disposeWhen()) {
|
|
// See comment above about suppressDisposalUntilDisposeWhenReturnsFalse
|
|
if (!state.suppressDisposalUntilDisposeWhenReturnsFalse) {
|
|
computedObservable.dispose();
|
|
return;
|
|
}
|
|
} else {
|
|
// It just did return false, so we can stop suppressing now
|
|
state.suppressDisposalUntilDisposeWhenReturnsFalse = false;
|
|
}
|
|
|
|
state.isBeingEvaluated = true;
|
|
try {
|
|
changed = this.evaluateImmediate_CallReadWithDependencyDetection(notifyChange);
|
|
} finally {
|
|
state.isBeingEvaluated = false;
|
|
}
|
|
|
|
return changed;
|
|
},
|
|
evaluateImmediate_CallReadWithDependencyDetection: function (notifyChange) {
|
|
// This function is really just part of the evaluateImmediate logic. You would never call it from anywhere else.
|
|
// Factoring it out into a separate function means it can be independent of the try/catch block in evaluateImmediate,
|
|
// which contributes to saving about 40% off the CPU overhead of computed evaluation (on V8 at least).
|
|
|
|
var computedObservable = this,
|
|
state = computedObservable[computedState],
|
|
changed = false;
|
|
|
|
// Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
|
|
// Then, during evaluation, we cross off any that are in fact still being used.
|
|
var isInitial = state.pure ? undefined : !state.dependenciesCount, // If we're evaluating when there are no previous dependencies, it must be the first time
|
|
dependencyDetectionContext = {
|
|
computedObservable: computedObservable,
|
|
disposalCandidates: state.dependencyTracking,
|
|
disposalCount: state.dependenciesCount
|
|
};
|
|
|
|
ko.dependencyDetection.begin({
|
|
callbackTarget: dependencyDetectionContext,
|
|
callback: computedBeginDependencyDetectionCallback,
|
|
computed: computedObservable,
|
|
isInitial: isInitial
|
|
});
|
|
|
|
state.dependencyTracking = {};
|
|
state.dependenciesCount = 0;
|
|
|
|
var newValue = this.evaluateImmediate_CallReadThenEndDependencyDetection(state, dependencyDetectionContext);
|
|
|
|
if (!state.dependenciesCount) {
|
|
computedObservable.dispose();
|
|
changed = true; // When evaluation causes a disposal, make sure all dependent computeds get notified so they'll see the new state
|
|
} else {
|
|
changed = computedObservable.isDifferent(state.latestValue, newValue);
|
|
}
|
|
|
|
if (changed) {
|
|
if (!state.isSleeping) {
|
|
computedObservable["notifySubscribers"](state.latestValue, "beforeChange");
|
|
} else {
|
|
computedObservable.updateVersion();
|
|
}
|
|
|
|
state.latestValue = newValue;
|
|
if (DEBUG) computedObservable._latestValue = newValue;
|
|
|
|
computedObservable["notifySubscribers"](state.latestValue, "spectate");
|
|
|
|
if (!state.isSleeping && notifyChange) {
|
|
computedObservable["notifySubscribers"](state.latestValue);
|
|
}
|
|
if (computedObservable._recordUpdate) {
|
|
computedObservable._recordUpdate();
|
|
}
|
|
}
|
|
|
|
if (isInitial) {
|
|
computedObservable["notifySubscribers"](state.latestValue, "awake");
|
|
}
|
|
|
|
return changed;
|
|
},
|
|
evaluateImmediate_CallReadThenEndDependencyDetection: function (state, dependencyDetectionContext) {
|
|
// This function is really part of the evaluateImmediate_CallReadWithDependencyDetection logic.
|
|
// You'd never call it from anywhere else. Factoring it out means that evaluateImmediate_CallReadWithDependencyDetection
|
|
// can be independent of try/finally blocks, which contributes to saving about 40% off the CPU
|
|
// overhead of computed evaluation (on V8 at least).
|
|
|
|
try {
|
|
var readFunction = state.readFunction;
|
|
return state.evaluatorFunctionTarget ? readFunction.call(state.evaluatorFunctionTarget) : readFunction();
|
|
} finally {
|
|
ko.dependencyDetection.end();
|
|
|
|
// For each subscription no longer being used, remove it from the active subscriptions list and dispose it
|
|
if (dependencyDetectionContext.disposalCount && !state.isSleeping) {
|
|
ko.utils.objectForEach(dependencyDetectionContext.disposalCandidates, computedDisposeDependencyCallback);
|
|
}
|
|
|
|
state.isStale = state.isDirty = false;
|
|
}
|
|
},
|
|
peek: function (evaluate) {
|
|
// By default, peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set.
|
|
// Pass in true to evaluate if needed.
|
|
var state = this[computedState];
|
|
if ((state.isDirty && (evaluate || !state.dependenciesCount)) || (state.isSleeping && this.haveDependenciesChanged())) {
|
|
this.evaluateImmediate();
|
|
}
|
|
return state.latestValue;
|
|
},
|
|
limit: function (limitFunction) {
|
|
// Override the limit function with one that delays evaluation as well
|
|
ko.subscribable['fn'].limit.call(this, limitFunction);
|
|
this._evalIfChanged = function () {
|
|
if (!this[computedState].isSleeping) {
|
|
if (this[computedState].isStale) {
|
|
this.evaluateImmediate();
|
|
} else {
|
|
this[computedState].isDirty = false;
|
|
}
|
|
}
|
|
return this[computedState].latestValue;
|
|
};
|
|
this._evalDelayed = function (isChange) {
|
|
this._limitBeforeChange(this[computedState].latestValue);
|
|
|
|
// Mark as dirty
|
|
this[computedState].isDirty = true;
|
|
if (isChange) {
|
|
this[computedState].isStale = true;
|
|
}
|
|
|
|
// Pass the observable to the "limit" code, which will evaluate it when
|
|
// it's time to do the notification.
|
|
this._limitChange(this, !isChange /* isDirty */);
|
|
};
|
|
},
|
|
dispose: function () {
|
|
var state = this[computedState];
|
|
if (!state.isSleeping && state.dependencyTracking) {
|
|
ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
|
|
if (dependency.dispose)
|
|
dependency.dispose();
|
|
});
|
|
}
|
|
if (state.disposeWhenNodeIsRemoved && state.domNodeDisposalCallback) {
|
|
ko.utils.domNodeDisposal.removeDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback);
|
|
}
|
|
state.dependencyTracking = undefined;
|
|
state.dependenciesCount = 0;
|
|
state.isDisposed = true;
|
|
state.isStale = false;
|
|
state.isDirty = false;
|
|
state.isSleeping = false;
|
|
state.disposeWhenNodeIsRemoved = undefined;
|
|
state.disposeWhen = undefined;
|
|
state.readFunction = undefined;
|
|
if (!this.hasWriteFunction) {
|
|
state.evaluatorFunctionTarget = undefined;
|
|
}
|
|
}
|
|
};
|
|
|
|
var pureComputedOverrides = {
|
|
beforeSubscriptionAdd: function (event) {
|
|
// If asleep, wake up the computed by subscribing to any dependencies.
|
|
var computedObservable = this,
|
|
state = computedObservable[computedState];
|
|
if (!state.isDisposed && state.isSleeping && event == 'change') {
|
|
state.isSleeping = false;
|
|
if (state.isStale || computedObservable.haveDependenciesChanged()) {
|
|
state.dependencyTracking = null;
|
|
state.dependenciesCount = 0;
|
|
if (computedObservable.evaluateImmediate()) {
|
|
computedObservable.updateVersion();
|
|
}
|
|
} else {
|
|
// First put the dependencies in order
|
|
var dependenciesOrder = [];
|
|
ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
|
|
dependenciesOrder[dependency._order] = id;
|
|
});
|
|
// Next, subscribe to each one
|
|
ko.utils.arrayForEach(dependenciesOrder, function (id, order) {
|
|
var dependency = state.dependencyTracking[id],
|
|
subscription = computedObservable.subscribeToDependency(dependency._target);
|
|
subscription._order = order;
|
|
subscription._version = dependency._version;
|
|
state.dependencyTracking[id] = subscription;
|
|
});
|
|
// Waking dependencies may have triggered effects
|
|
if (computedObservable.haveDependenciesChanged()) {
|
|
if (computedObservable.evaluateImmediate()) {
|
|
computedObservable.updateVersion();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!state.isDisposed) { // test since evaluating could trigger disposal
|
|
computedObservable["notifySubscribers"](state.latestValue, "awake");
|
|
}
|
|
}
|
|
},
|
|
afterSubscriptionRemove: function (event) {
|
|
var state = this[computedState];
|
|
if (!state.isDisposed && event == 'change' && !this.hasSubscriptionsForEvent('change')) {
|
|
ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
|
|
if (dependency.dispose) {
|
|
state.dependencyTracking[id] = {
|
|
_target: dependency._target,
|
|
_order: dependency._order,
|
|
_version: dependency._version
|
|
};
|
|
dependency.dispose();
|
|
}
|
|
});
|
|
state.isSleeping = true;
|
|
this["notifySubscribers"](undefined, "asleep");
|
|
}
|
|
},
|
|
getVersion: function () {
|
|
// Because a pure computed is not automatically updated while it is sleeping, we can't
|
|
// simply return the version number. Instead, we check if any of the dependencies have
|
|
// changed and conditionally re-evaluate the computed observable.
|
|
var state = this[computedState];
|
|
if (state.isSleeping && (state.isStale || this.haveDependenciesChanged())) {
|
|
this.evaluateImmediate();
|
|
}
|
|
return ko.subscribable['fn'].getVersion.call(this);
|
|
}
|
|
};
|
|
|
|
var deferEvaluationOverrides = {
|
|
beforeSubscriptionAdd: function (event) {
|
|
// This will force a computed with deferEvaluation to evaluate when the first subscription is registered.
|
|
if (event == 'change' || event == 'beforeChange') {
|
|
this.peek();
|
|
}
|
|
}
|
|
};
|
|
|
|
// Note that for browsers that don't support proto assignment, the
|
|
// inheritance chain is created manually in the ko.computed constructor
|
|
if (ko.utils.canSetPrototype) {
|
|
ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']);
|
|
}
|
|
|
|
// Set the proto values for ko.computed
|
|
var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
|
|
computedFn[protoProp] = ko.computed;
|
|
|
|
ko.isComputed = function (instance) {
|
|
return (typeof instance == 'function' && instance[protoProp] === computedFn[protoProp]);
|
|
};
|
|
|
|
ko.isPureComputed = function (instance) {
|
|
return ko.isComputed(instance) && instance[computedState] && instance[computedState].pure;
|
|
};
|
|
|
|
ko.exportSymbol('computed', ko.computed);
|
|
ko.exportSymbol('dependentObservable', ko.computed); // export ko.dependentObservable for backwards compatibility (1.x)
|
|
ko.exportSymbol('isComputed', ko.isComputed);
|
|
ko.exportSymbol('isPureComputed', ko.isPureComputed);
|
|
ko.exportSymbol('computed.fn', computedFn);
|
|
ko.exportProperty(computedFn, 'peek', computedFn.peek);
|
|
ko.exportProperty(computedFn, 'dispose', computedFn.dispose);
|
|
ko.exportProperty(computedFn, 'isActive', computedFn.isActive);
|
|
ko.exportProperty(computedFn, 'getDependenciesCount', computedFn.getDependenciesCount);
|
|
ko.exportProperty(computedFn, 'getDependencies', computedFn.getDependencies);
|
|
|
|
ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) {
|
|
if (typeof evaluatorFunctionOrOptions === 'function') {
|
|
return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, {'pure':true});
|
|
} else {
|
|
evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions); // make a copy of the parameter object
|
|
evaluatorFunctionOrOptions['pure'] = true;
|
|
return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget);
|
|
}
|
|
}
|
|
ko.exportSymbol('pureComputed', ko.pureComputed);
|
|
|
|
(function() {
|
|
var maxNestedObservableDepth = 10; // Escape the (unlikely) pathological case where an observable's current value is itself (or similar reference cycle)
|
|
|
|
ko.toJS = function(rootObject) {
|
|
if (arguments.length == 0)
|
|
throw new Error("When calling ko.toJS, pass the object you want to convert.");
|
|
|
|
// We just unwrap everything at every level in the object graph
|
|
return mapJsObjectGraph(rootObject, function(valueToMap) {
|
|
// Loop because an observable's value might in turn be another observable wrapper
|
|
for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
|
|
valueToMap = valueToMap();
|
|
return valueToMap;
|
|
});
|
|
};
|
|
|
|
ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional
|
|
var plainJavaScriptObject = ko.toJS(rootObject);
|
|
return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
|
|
};
|
|
|
|
function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
|
|
visitedObjects = visitedObjects || new objectLookup();
|
|
|
|
rootObject = mapInputCallback(rootObject);
|
|
var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof RegExp)) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));
|
|
if (!canHaveProperties)
|
|
return rootObject;
|
|
|
|
var outputProperties = rootObject instanceof Array ? [] : {};
|
|
visitedObjects.save(rootObject, outputProperties);
|
|
|
|
visitPropertiesOrArrayEntries(rootObject, function(indexer) {
|
|
var propertyValue = mapInputCallback(rootObject[indexer]);
|
|
|
|
switch (typeof propertyValue) {
|
|
case "boolean":
|
|
case "number":
|
|
case "string":
|
|
case "function":
|
|
outputProperties[indexer] = propertyValue;
|
|
break;
|
|
case "object":
|
|
case "undefined":
|
|
var previouslyMappedValue = visitedObjects.get(propertyValue);
|
|
outputProperties[indexer] = (previouslyMappedValue !== undefined)
|
|
? previouslyMappedValue
|
|
: mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
|
|
break;
|
|
}
|
|
});
|
|
|
|
return outputProperties;
|
|
}
|
|
|
|
function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
|
|
if (rootObject instanceof Array) {
|
|
for (var i = 0; i < rootObject.length; i++)
|
|
visitorCallback(i);
|
|
|
|
// For arrays, also respect toJSON property for custom mappings (fixes #278)
|
|
if (typeof rootObject['toJSON'] == 'function')
|
|
visitorCallback('toJSON');
|
|
} else {
|
|
for (var propertyName in rootObject) {
|
|
visitorCallback(propertyName);
|
|
}
|
|
}
|
|
};
|
|
|
|
function objectLookup() {
|
|
this.keys = [];
|
|
this.values = [];
|
|
};
|
|
|
|
objectLookup.prototype = {
|
|
constructor: objectLookup,
|
|
save: function(key, value) {
|
|
var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
|
|
if (existingIndex >= 0)
|
|
this.values[existingIndex] = value;
|
|
else {
|
|
this.keys.push(key);
|
|
this.values.push(value);
|
|
}
|
|
},
|
|
get: function(key) {
|
|
var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
|
|
return (existingIndex >= 0) ? this.values[existingIndex] : undefined;
|
|
}
|
|
};
|
|
})();
|
|
|
|
ko.exportSymbol('toJS', ko.toJS);
|
|
ko.exportSymbol('toJSON', ko.toJSON);
|
|
ko.when = function(predicate, callback, context) {
|
|
function kowhen (resolve) {
|
|
var observable = ko.pureComputed(predicate, context).extend({notify:'always'});
|
|
var subscription = observable.subscribe(function(value) {
|
|
if (value) {
|
|
subscription.dispose();
|
|
resolve(value);
|
|
}
|
|
});
|
|
// In case the initial value is true, process it right away
|
|
observable['notifySubscribers'](observable.peek());
|
|
|
|
return subscription;
|
|
}
|
|
if (typeof Promise === "function" && !callback) {
|
|
return new Promise(kowhen);
|
|
} else {
|
|
return kowhen(callback.bind(context));
|
|
}
|
|
};
|
|
|
|
ko.exportSymbol('when', ko.when);
|
|
(function () {
|
|
var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
|
|
|
|
// Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
|
|
// are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
|
|
// that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
|
|
ko.selectExtensions = {
|
|
readValue : function(element) {
|
|
switch (ko.utils.tagNameLower(element)) {
|
|
case 'option':
|
|
if (element[hasDomDataExpandoProperty] === true)
|
|
return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
|
|
return ko.utils.ieVersion <= 7
|
|
? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text)
|
|
: element.value;
|
|
case 'select':
|
|
return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
|
|
default:
|
|
return element.value;
|
|
}
|
|
},
|
|
|
|
writeValue: function(element, value, allowUnset) {
|
|
switch (ko.utils.tagNameLower(element)) {
|
|
case 'option':
|
|
if (typeof value === "string") {
|
|
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
|
|
if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
|
|
delete element[hasDomDataExpandoProperty];
|
|
}
|
|
element.value = value;
|
|
}
|
|
else {
|
|
// Store arbitrary object using DomData
|
|
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
|
|
element[hasDomDataExpandoProperty] = true;
|
|
|
|
// Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
|
|
element.value = typeof value === "number" ? value : "";
|
|
}
|
|
break;
|
|
case 'select':
|
|
if (value === "" || value === null) // A blank string or null value will select the caption
|
|
value = undefined;
|
|
var selection = -1;
|
|
for (var i = 0, n = element.options.length, optionValue; i < n; ++i) {
|
|
optionValue = ko.selectExtensions.readValue(element.options[i]);
|
|
// Include special check to handle selecting a caption with a blank string value
|
|
if (optionValue == value || (optionValue === "" && value === undefined)) {
|
|
selection = i;
|
|
break;
|
|
}
|
|
}
|
|
if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) {
|
|
element.selectedIndex = selection;
|
|
if (ko.utils.ieVersion === 6) {
|
|
// Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
|
|
// right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
|
|
// to apply the value as well.
|
|
ko.utils.setTimeout(function () {
|
|
element.selectedIndex = selection;
|
|
}, 0);
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
if ((value === null) || (value === undefined))
|
|
value = "";
|
|
element.value = value;
|
|
break;
|
|
}
|
|
}
|
|
};
|
|
})();
|
|
|
|
ko.exportSymbol('selectExtensions', ko.selectExtensions);
|
|
ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
|
|
ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
|
|
ko.expressionRewriting = (function () {
|
|
var javaScriptReservedWords = ["true", "false", "null", "undefined"];
|
|
|
|
// Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
|
|
// This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
|
|
// This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911).
|
|
var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
|
|
|
|
function getWriteableValue(expression) {
|
|
if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0)
|
|
return false;
|
|
var match = expression.match(javaScriptAssignmentTarget);
|
|
return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
|
|
}
|
|
|
|
// The following regular expressions will be used to split an object-literal string into tokens
|
|
|
|
var specials = ',"\'`{}()/:[\\]', // These characters have special meaning to the parser and must not appear in the middle of a token, except as part of a string.
|
|
// Create the actual regular expression by or-ing the following regex strings. The order is important.
|
|
bindingToken = RegExp([
|
|
// These match strings, either with double quotes, single quotes, or backticks
|
|
'"(?:\\\\.|[^"])*"',
|
|
"'(?:\\\\.|[^'])*'",
|
|
"`(?:\\\\.|[^`])*`",
|
|
// Match C style comments
|
|
"/\\*(?:[^*]|\\*+[^*/])*\\*+/",
|
|
// Match C++ style comments
|
|
"//.*\n",
|
|
// Match a regular expression (text enclosed by slashes), but will also match sets of divisions
|
|
// as a regular expression (this is handled by the parsing loop below).
|
|
'/(?:\\\\.|[^/])+/\w*',
|
|
// Match text (at least two characters) that does not contain any of the above special characters,
|
|
// although some of the special characters are allowed to start it (all but the colon and comma).
|
|
// The text can contain spaces, but leading or trailing spaces are skipped.
|
|
'[^\\s:,/][^' + specials + ']*[^\\s' + specials + ']',
|
|
// Match any non-space character not matched already. This will match colons and commas, since they're
|
|
// not matched by "everyThingElse", but will also match any other single character that wasn't already
|
|
// matched (for example: in "a: 1, b: 2", each of the non-space characters will be matched by oneNotSpace).
|
|
'[^\\s]'
|
|
].join('|'), 'g'),
|
|
|
|
// Match end of previous token to determine whether a slash is a division or regex.
|
|
divisionLookBehind = /[\])"'A-Za-z0-9_$]+$/,
|
|
keywordRegexLookBehind = {'in':1,'return':1,'typeof':1};
|
|
|
|
function parseObjectLiteral(objectLiteralString) {
|
|
// Trim leading and trailing spaces from the string
|
|
var str = ko.utils.stringTrim(objectLiteralString);
|
|
|
|
// Trim braces '{' surrounding the whole object literal
|
|
if (str.charCodeAt(0) === 123) str = str.slice(1, -1);
|
|
|
|
// Add a newline to correctly match a C++ style comment at the end of the string and
|
|
// add a comma so that we don't need a separate code block to deal with the last item
|
|
str += "\n,";
|
|
|
|
// Split into tokens
|
|
var result = [], toks = str.match(bindingToken), key, values = [], depth = 0;
|
|
|
|
if (toks.length > 1) {
|
|
for (var i = 0, tok; tok = toks[i]; ++i) {
|
|
var c = tok.charCodeAt(0);
|
|
// A comma signals the end of a key/value pair if depth is zero
|
|
if (c === 44) { // ","
|
|
if (depth <= 0) {
|
|
result.push((key && values.length) ? {key: key, value: values.join('')} : {'unknown': key || values.join('')});
|
|
key = depth = 0;
|
|
values = [];
|
|
continue;
|
|
}
|
|
// Simply skip the colon that separates the name and value
|
|
} else if (c === 58) { // ":"
|
|
if (!depth && !key && values.length === 1) {
|
|
key = values.pop();
|
|
continue;
|
|
}
|
|
// Comments: skip them
|
|
} else if (c === 47 && tok.length > 1 && (tok.charCodeAt(1) === 47 || tok.charCodeAt(1) === 42)) { // "//" or "/*"
|
|
continue;
|
|
// A set of slashes is initially matched as a regular expression, but could be division
|
|
} else if (c === 47 && i && tok.length > 1) { // "/"
|
|
// Look at the end of the previous token to determine if the slash is actually division
|
|
var match = toks[i-1].match(divisionLookBehind);
|
|
if (match && !keywordRegexLookBehind[match[0]]) {
|
|
// The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash)
|
|
str = str.substr(str.indexOf(tok) + 1);
|
|
toks = str.match(bindingToken);
|
|
i = -1;
|
|
// Continue with just the slash
|
|
tok = '/';
|
|
}
|
|
// Increment depth for parentheses, braces, and brackets so that interior commas are ignored
|
|
} else if (c === 40 || c === 123 || c === 91) { // '(', '{', '['
|
|
++depth;
|
|
} else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']'
|
|
--depth;
|
|
// The key will be the first token; if it's a string, trim the quotes
|
|
} else if (!key && !values.length && (c === 34 || c === 39)) { // '"', "'"
|
|
tok = tok.slice(1, -1);
|
|
}
|
|
values.push(tok);
|
|
}
|
|
if (depth > 0) {
|
|
throw Error("Unbalanced parentheses, braces, or brackets");
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
// Two-way bindings include a write function that allow the handler to update the value even if it's not an observable.
|
|
var twoWayBindings = {};
|
|
|
|
function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) {
|
|
bindingOptions = bindingOptions || {};
|
|
|
|
function processKeyValue(key, val) {
|
|
var writableVal;
|
|
function callPreprocessHook(obj) {
|
|
return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true;
|
|
}
|
|
if (!bindingParams) {
|
|
if (!callPreprocessHook(ko['getBindingHandler'](key)))
|
|
return;
|
|
|
|
if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) {
|
|
// For two-way bindings, provide a write method in case the value
|
|
// isn't a writable observable.
|
|
var writeKey = typeof twoWayBindings[key] == 'string' ? twoWayBindings[key] : key;
|
|
propertyAccessorResultStrings.push("'" + writeKey + "':function(_z){" + writableVal + "=_z}");
|
|
}
|
|
}
|
|
// Values are wrapped in a function so that each value can be accessed independently
|
|
if (makeValueAccessors) {
|
|
val = 'function(){return ' + val + ' }';
|
|
}
|
|
resultStrings.push("'" + key + "':" + val);
|
|
}
|
|
|
|
var resultStrings = [],
|
|
propertyAccessorResultStrings = [],
|
|
makeValueAccessors = bindingOptions['valueAccessors'],
|
|
bindingParams = bindingOptions['bindingParams'],
|
|
keyValueArray = typeof bindingsStringOrKeyValueArray === "string" ?
|
|
parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray;
|
|
|
|
ko.utils.arrayForEach(keyValueArray, function(keyValue) {
|
|
processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value);
|
|
});
|
|
|
|
if (propertyAccessorResultStrings.length)
|
|
processKeyValue('_ko_property_writers', "{" + propertyAccessorResultStrings.join(",") + " }");
|
|
|
|
return resultStrings.join(",");
|
|
}
|
|
|
|
return {
|
|
bindingRewriteValidators: [],
|
|
|
|
twoWayBindings: twoWayBindings,
|
|
|
|
parseObjectLiteral: parseObjectLiteral,
|
|
|
|
preProcessBindings: preProcessBindings,
|
|
|
|
keyValueArrayContainsKey: function(keyValueArray, key) {
|
|
for (var i = 0; i < keyValueArray.length; i++)
|
|
if (keyValueArray[i]['key'] == key)
|
|
return true;
|
|
return false;
|
|
},
|
|
|
|
// Internal, private KO utility for updating model properties from within bindings
|
|
// property: If the property being updated is (or might be) an observable, pass it here
|
|
// If it turns out to be a writable observable, it will be written to directly
|
|
// allBindings: An object with a get method to retrieve bindings in the current execution context.
|
|
// This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
|
|
// key: The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
|
|
// value: The value to be written
|
|
// checkIfDifferent: If true, and if the property being written is a writable observable, the value will only be written if
|
|
// it is !== existing value on that writable observable
|
|
writeValueToProperty: function(property, allBindings, key, value, checkIfDifferent) {
|
|
if (!property || !ko.isObservable(property)) {
|
|
var propWriters = allBindings.get('_ko_property_writers');
|
|
if (propWriters && propWriters[key])
|
|
propWriters[key](value);
|
|
} else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {
|
|
property(value);
|
|
}
|
|
}
|
|
};
|
|
})();
|
|
|
|
ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
|
|
ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
|
|
ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
|
|
ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
|
|
|
|
// Making bindings explicitly declare themselves as "two way" isn't ideal in the long term (it would be better if
|
|
// all bindings could use an official 'property writer' API without needing to declare that they might). However,
|
|
// since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable
|
|
// as an internal implementation detail in the short term.
|
|
// For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an
|
|
// undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official
|
|
// public API, and we reserve the right to remove it at any time if we create a real public property writers API.
|
|
ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings);
|
|
|
|
// For backward compatibility, define the following aliases. (Previously, these function names were misleading because
|
|
// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
|
|
ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
|
|
ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);
|
|
(function() {
|
|
// "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
|
|
// may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
|
|
// If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
|
|
// of that virtual hierarchy
|
|
//
|
|
// The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
|
|
// without having to scatter special cases all over the binding and templating code.
|
|
|
|
// IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
|
|
// but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
|
|
// So, use node.text where available, and node.nodeValue elsewhere
|
|
var commentNodesHaveTextProperty = document && document.createComment("test").text === "<!--test-->";
|
|
|
|
var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+([\s\S]+))?\s*-->$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/;
|
|
var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
|
|
var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
|
|
|
|
function isStartComment(node) {
|
|
return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
|
|
}
|
|
|
|
function isEndComment(node) {
|
|
return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
|
|
}
|
|
|
|
function isUnmatchedEndComment(node) {
|
|
return isEndComment(node) && !(ko.utils.domData.get(node, matchedEndCommentDataKey));
|
|
}
|
|
|
|
var matchedEndCommentDataKey = "__ko_matchedEndComment__"
|
|
|
|
function getVirtualChildren(startComment, allowUnbalanced) {
|
|
var currentNode = startComment;
|
|
var depth = 1;
|
|
var children = [];
|
|
while (currentNode = currentNode.nextSibling) {
|
|
if (isEndComment(currentNode)) {
|
|
ko.utils.domData.set(currentNode, matchedEndCommentDataKey, true);
|
|
depth--;
|
|
if (depth === 0)
|
|
return children;
|
|
}
|
|
|
|
children.push(currentNode);
|
|
|
|
if (isStartComment(currentNode))
|
|
depth++;
|
|
}
|
|
if (!allowUnbalanced)
|
|
throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
|
|
return null;
|
|
}
|
|
|
|
function getMatchingEndComment(startComment, allowUnbalanced) {
|
|
var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
|
|
if (allVirtualChildren) {
|
|
if (allVirtualChildren.length > 0)
|
|
return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
|
|
return startComment.nextSibling;
|
|
} else
|
|
return null; // Must have no matching end comment, and allowUnbalanced is true
|
|
}
|
|
|
|
function getUnbalancedChildTags(node) {
|
|
// e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
|
|
// from <div>OK</div><!-- /ko --><!-- /ko -->, returns: <!-- /ko --><!-- /ko -->
|
|
var childNode = node.firstChild, captureRemaining = null;
|
|
if (childNode) {
|
|
do {
|
|
if (captureRemaining) // We already hit an unbalanced node and are now just scooping up all subsequent nodes
|
|
captureRemaining.push(childNode);
|
|
else if (isStartComment(childNode)) {
|
|
var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
|
|
if (matchingEndComment) // It's a balanced tag, so skip immediately to the end of this virtual set
|
|
childNode = matchingEndComment;
|
|
else
|
|
captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
|
|
} else if (isEndComment(childNode)) {
|
|
captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
|
|
}
|
|
} while (childNode = childNode.nextSibling);
|
|
}
|
|
return captureRemaining;
|
|
}
|
|
|
|
ko.virtualElements = {
|
|
allowedBindings: {},
|
|
|
|
childNodes: function(node) {
|
|
return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
|
|
},
|
|
|
|
emptyNode: function(node) {
|
|
if (!isStartComment(node))
|
|
ko.utils.emptyDomNode(node);
|
|
else {
|
|
var virtualChildren = ko.virtualElements.childNodes(node);
|
|
for (var i = 0, j = virtualChildren.length; i < j; i++)
|
|
ko.removeNode(virtualChildren[i]);
|
|
}
|
|
},
|
|
|
|
setDomNodeChildren: function(node, childNodes) {
|
|
if (!isStartComment(node))
|
|
ko.utils.setDomNodeChildren(node, childNodes);
|
|
else {
|
|
ko.virtualElements.emptyNode(node);
|
|
var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
|
|
for (var i = 0, j = childNodes.length; i < j; i++)
|
|
endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
|
|
}
|
|
},
|
|
|
|
prepend: function(containerNode, nodeToPrepend) {
|
|
var insertBeforeNode;
|
|
|
|
if (isStartComment(containerNode)) {
|
|
// Start comments must always have a parent and at least one following sibling (the end comment)
|
|
insertBeforeNode = containerNode.nextSibling;
|
|
containerNode = containerNode.parentNode;
|
|
} else {
|
|
insertBeforeNode = containerNode.firstChild;
|
|
}
|
|
|
|
if (!insertBeforeNode) {
|
|
containerNode.appendChild(nodeToPrepend);
|
|
} else if (nodeToPrepend !== insertBeforeNode) { // IE will sometimes crash if you try to insert a node before itself
|
|
containerNode.insertBefore(nodeToPrepend, insertBeforeNode);
|
|
}
|
|
},
|
|
|
|
insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
|
|
if (!insertAfterNode) {
|
|
ko.virtualElements.prepend(containerNode, nodeToInsert);
|
|
} else {
|
|
// Children of start comments must always have a parent and at least one following sibling (the end comment)
|
|
var insertBeforeNode = insertAfterNode.nextSibling;
|
|
|
|
if (isStartComment(containerNode)) {
|
|
containerNode = containerNode.parentNode;
|
|
}
|
|
|
|
if (!insertBeforeNode) {
|
|
containerNode.appendChild(nodeToInsert);
|
|
} else if (nodeToInsert !== insertBeforeNode) { // IE will sometimes crash if you try to insert a node before itself
|
|
containerNode.insertBefore(nodeToInsert, insertBeforeNode);
|
|
}
|
|
}
|
|
},
|
|
|
|
firstChild: function(node) {
|
|
if (!isStartComment(node)) {
|
|
if (node.firstChild && isEndComment(node.firstChild)) {
|
|
throw new Error("Found invalid end comment, as the first child of " + node);
|
|
}
|
|
return node.firstChild;
|
|
} else if (!node.nextSibling || isEndComment(node.nextSibling)) {
|
|
return null;
|
|
} else {
|
|
return node.nextSibling;
|
|
}
|
|
},
|
|
|
|
nextSibling: function(node) {
|
|
if (isStartComment(node)) {
|
|
node = getMatchingEndComment(node);
|
|
}
|
|
|
|
if (node.nextSibling && isEndComment(node.nextSibling)) {
|
|
if (isUnmatchedEndComment(node.nextSibling)) {
|
|
throw Error("Found end comment without a matching opening comment, as child of " + node);
|
|
} else {
|
|
return null;
|
|
}
|
|
} else {
|
|
return node.nextSibling;
|
|
}
|
|
},
|
|
|
|
hasBindingValue: isStartComment,
|
|
|
|
virtualNodeBindingValue: function(node) {
|
|
var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
|
|
return regexMatch ? regexMatch[1] : null;
|
|
},
|
|
|
|
normaliseVirtualElementDomStructure: function(elementVerified) {
|
|
// Workaround for https://github.com/SteveSanderson/knockout/issues/155
|
|
// (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
|
|
// that are direct descendants of <ul> into the preceding <li>)
|
|
if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
|
|
return;
|
|
|
|
// Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
|
|
// must be intended to appear *after* that child, so move them there.
|
|
var childNode = elementVerified.firstChild;
|
|
if (childNode) {
|
|
do {
|
|
if (childNode.nodeType === 1) {
|
|
var unbalancedTags = getUnbalancedChildTags(childNode);
|
|
if (unbalancedTags) {
|
|
// Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
|
|
var nodeToInsertBefore = childNode.nextSibling;
|
|
for (var i = 0; i < unbalancedTags.length; i++) {
|
|
if (nodeToInsertBefore)
|
|
elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
|
|
else
|
|
elementVerified.appendChild(unbalancedTags[i]);
|
|
}
|
|
}
|
|
}
|
|
} while (childNode = childNode.nextSibling);
|
|
}
|
|
}
|
|
};
|
|
})();
|
|
ko.exportSymbol('virtualElements', ko.virtualElements);
|
|
ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
|
|
ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
|
|
//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild); // firstChild is not minified
|
|
ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
|
|
//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified
|
|
ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
|
|
ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
|
|
(function() {
|
|
var defaultBindingAttributeName = "data-bind";
|
|
|
|
ko.bindingProvider = function() {
|
|
this.bindingCache = {};
|
|
};
|
|
|
|
ko.utils.extend(ko.bindingProvider.prototype, {
|
|
'nodeHasBindings': function(node) {
|
|
switch (node.nodeType) {
|
|
case 1: // Element
|
|
return node.getAttribute(defaultBindingAttributeName) != null
|
|
|| ko.components['getComponentNameForNode'](node);
|
|
case 8: // Comment node
|
|
return ko.virtualElements.hasBindingValue(node);
|
|
default: return false;
|
|
}
|
|
},
|
|
|
|
'getBindings': function(node, bindingContext) {
|
|
var bindingsString = this['getBindingsString'](node, bindingContext),
|
|
parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
|
|
return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false);
|
|
},
|
|
|
|
'getBindingAccessors': function(node, bindingContext) {
|
|
var bindingsString = this['getBindingsString'](node, bindingContext),
|
|
parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;
|
|
return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true);
|
|
},
|
|
|
|
// The following function is only used internally by this default provider.
|
|
// It's not part of the interface definition for a general binding provider.
|
|
'getBindingsString': function(node, bindingContext) {
|
|
switch (node.nodeType) {
|
|
case 1: return node.getAttribute(defaultBindingAttributeName); // Element
|
|
case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
|
|
default: return null;
|
|
}
|
|
},
|
|
|
|
// The following function is only used internally by this default provider.
|
|
// It's not part of the interface definition for a general binding provider.
|
|
'parseBindingsString': function(bindingsString, bindingContext, node, options) {
|
|
try {
|
|
var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options);
|
|
return bindingFunction(bindingContext, node);
|
|
} catch (ex) {
|
|
ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message;
|
|
throw ex;
|
|
}
|
|
}
|
|
});
|
|
|
|
ko.bindingProvider['instance'] = new ko.bindingProvider();
|
|
|
|
function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) {
|
|
var cacheKey = bindingsString + (options && options['valueAccessors'] || '');
|
|
return cache[cacheKey]
|
|
|| (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));
|
|
}
|
|
|
|
function createBindingsStringEvaluator(bindingsString, options) {
|
|
// Build the source for a function that evaluates "expression"
|
|
// For each scope variable, add an extra level of "with" nesting
|
|
// Example result: with(sc1) { with(sc0) { return (expression) } }
|
|
var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),
|
|
functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
|
|
return new Function("$context", "$element", functionBody);
|
|
}
|
|
})();
|
|
|
|
ko.exportSymbol('bindingProvider', ko.bindingProvider);
|
|
(function () {
|
|
// Hide or don't minify context properties, see https://github.com/knockout/knockout/issues/2294
|
|
var contextSubscribable = ko.utils.createSymbolOrString('_subscribable');
|
|
var contextAncestorBindingInfo = ko.utils.createSymbolOrString('_ancestorBindingInfo');
|
|
var contextDataDependency = ko.utils.createSymbolOrString('_dataDependency');
|
|
|
|
ko.bindingHandlers = {};
|
|
|
|
// The following element types will not be recursed into during binding.
|
|
var bindingDoesNotRecurseIntoElementTypes = {
|
|
// Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents,
|
|
// because it's unexpected and a potential XSS issue.
|
|
// Also bindings should not operate on <template> elements since this breaks in Internet Explorer
|
|
// and because such elements' contents are always intended to be bound in a different context
|
|
// from where they appear in the document.
|
|
'script': true,
|
|
'textarea': true,
|
|
'template': true
|
|
};
|
|
|
|
// Use an overridable method for retrieving binding handlers so that plugins may support dynamically created handlers
|
|
ko['getBindingHandler'] = function(bindingKey) {
|
|
return ko.bindingHandlers[bindingKey];
|
|
};
|
|
|
|
var inheritParentVm = {};
|
|
|
|
// The ko.bindingContext constructor is only called directly to create the root context. For child
|
|
// contexts, use bindingContext.createChildContext or bindingContext.extend.
|
|
ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback, options) {
|
|
|
|
// The binding context object includes static properties for the current, parent, and root view models.
|
|
// If a view model is actually stored in an observable, the corresponding binding context object, and
|
|
// any child contexts, must be updated when the view model is changed.
|
|
function updateContext() {
|
|
// Most of the time, the context will directly get a view model object, but if a function is given,
|
|
// we call the function to retrieve the view model. If the function accesses any observables or returns
|
|
// an observable, the dependency is tracked, and those observables can later cause the binding
|
|
// context to be updated.
|
|
var dataItemOrObservable = isFunc ? realDataItemOrAccessor() : realDataItemOrAccessor,
|
|
dataItem = ko.utils.unwrapObservable(dataItemOrObservable);
|
|
|
|
if (parentContext) {
|
|
// Copy $root and any custom properties from the parent context
|
|
ko.utils.extend(self, parentContext);
|
|
|
|
// Copy Symbol properties
|
|
if (contextAncestorBindingInfo in parentContext) {
|
|
self[contextAncestorBindingInfo] = parentContext[contextAncestorBindingInfo];
|
|
}
|
|
} else {
|
|
self['$parents'] = [];
|
|
self['$root'] = dataItem;
|
|
|
|
// Export 'ko' in the binding context so it will be available in bindings and templates
|
|
// even if 'ko' isn't exported as a global, such as when using an AMD loader.
|
|
// See https://github.com/SteveSanderson/knockout/issues/490
|
|
self['ko'] = ko;
|
|
}
|
|
|
|
self[contextSubscribable] = subscribable;
|
|
|
|
if (shouldInheritData) {
|
|
dataItem = self['$data'];
|
|
} else {
|
|
self['$rawData'] = dataItemOrObservable;
|
|
self['$data'] = dataItem;
|
|
}
|
|
|
|
if (dataItemAlias)
|
|
self[dataItemAlias] = dataItem;
|
|
|
|
// The extendCallback function is provided when creating a child context or extending a context.
|
|
// It handles the specific actions needed to finish setting up the binding context. Actions in this
|
|
// function could also add dependencies to this binding context.
|
|
if (extendCallback)
|
|
extendCallback(self, parentContext, dataItem);
|
|
|
|
// When a "parent" context is given and we don't already have a dependency on its context, register a dependency on it.
|
|
// Thus whenever the parent context is updated, this context will also be updated.
|
|
if (parentContext && parentContext[contextSubscribable] && !ko.computedContext.computed().hasAncestorDependency(parentContext[contextSubscribable])) {
|
|
parentContext[contextSubscribable]();
|
|
}
|
|
|
|
if (dataDependency) {
|
|
self[contextDataDependency] = dataDependency;
|
|
}
|
|
|
|
return self['$data'];
|
|
}
|
|
|
|
var self = this,
|
|
shouldInheritData = dataItemOrAccessor === inheritParentVm,
|
|
realDataItemOrAccessor = shouldInheritData ? undefined : dataItemOrAccessor,
|
|
isFunc = typeof(realDataItemOrAccessor) == "function" && !ko.isObservable(realDataItemOrAccessor),
|
|
nodes,
|
|
subscribable,
|
|
dataDependency = options && options['dataDependency'];
|
|
|
|
if (options && options['exportDependencies']) {
|
|
// The "exportDependencies" option means that the calling code will track any dependencies and re-create
|
|
// the binding context when they change.
|
|
updateContext();
|
|
} else {
|
|
subscribable = ko.pureComputed(updateContext);
|
|
subscribable.peek();
|
|
|
|
// At this point, the binding context has been initialized, and the "subscribable" computed observable is
|
|
// subscribed to any observables that were accessed in the process. If there is nothing to track, the
|
|
// computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in
|
|
// the context object.
|
|
if (subscribable.isActive()) {
|
|
// Always notify because even if the model ($data) hasn't changed, other context properties might have changed
|
|
subscribable['equalityComparer'] = null;
|
|
} else {
|
|
self[contextSubscribable] = undefined;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Extend the binding context hierarchy with a new view model object. If the parent context is watching
|
|
// any observables, the new child context will automatically get a dependency on the parent context.
|
|
// But this does not mean that the $data value of the child context will also get updated. If the child
|
|
// view model also depends on the parent view model, you must provide a function that returns the correct
|
|
// view model on each update.
|
|
ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback, options) {
|
|
if (!options && dataItemAlias && typeof dataItemAlias == "object") {
|
|
options = dataItemAlias;
|
|
dataItemAlias = options['as'];
|
|
extendCallback = options['extend'];
|
|
}
|
|
|
|
if (dataItemAlias && options && options['noChildContext']) {
|
|
var isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor);
|
|
return new ko.bindingContext(inheritParentVm, this, null, function (self) {
|
|
if (extendCallback)
|
|
extendCallback(self);
|
|
self[dataItemAlias] = isFunc ? dataItemOrAccessor() : dataItemOrAccessor;
|
|
}, options);
|
|
}
|
|
|
|
return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function (self, parentContext) {
|
|
// Extend the context hierarchy by setting the appropriate pointers
|
|
self['$parentContext'] = parentContext;
|
|
self['$parent'] = parentContext['$data'];
|
|
self['$parents'] = (parentContext['$parents'] || []).slice(0);
|
|
self['$parents'].unshift(self['$parent']);
|
|
if (extendCallback)
|
|
extendCallback(self);
|
|
}, options);
|
|
};
|
|
|
|
// Extend the binding context with new custom properties. This doesn't change the context hierarchy.
|
|
// Similarly to "child" contexts, provide a function here to make sure that the correct values are set
|
|
// when an observable view model is updated.
|
|
ko.bindingContext.prototype['extend'] = function(properties, options) {
|
|
return new ko.bindingContext(inheritParentVm, this, null, function(self, parentContext) {
|
|
ko.utils.extend(self, typeof(properties) == "function" ? properties(self) : properties);
|
|
}, options);
|
|
};
|
|
|
|
var boundElementDomDataKey = ko.utils.domData.nextKey();
|
|
|
|
function asyncContextDispose(node) {
|
|
var bindingInfo = ko.utils.domData.get(node, boundElementDomDataKey),
|
|
asyncContext = bindingInfo && bindingInfo.asyncContext;
|
|
if (asyncContext) {
|
|
bindingInfo.asyncContext = null;
|
|
asyncContext.notifyAncestor();
|
|
}
|
|
}
|
|
function AsyncCompleteContext(node, bindingInfo, ancestorBindingInfo) {
|
|
this.node = node;
|
|
this.bindingInfo = bindingInfo;
|
|
this.asyncDescendants = [];
|
|
this.childrenComplete = false;
|
|
|
|
if (!bindingInfo.asyncContext) {
|
|
ko.utils.domNodeDisposal.addDisposeCallback(node, asyncContextDispose);
|
|
}
|
|
|
|
if (ancestorBindingInfo && ancestorBindingInfo.asyncContext) {
|
|
ancestorBindingInfo.asyncContext.asyncDescendants.push(node);
|
|
this.ancestorBindingInfo = ancestorBindingInfo;
|
|
}
|
|
}
|
|
AsyncCompleteContext.prototype.notifyAncestor = function () {
|
|
if (this.ancestorBindingInfo && this.ancestorBindingInfo.asyncContext) {
|
|
this.ancestorBindingInfo.asyncContext.descendantComplete(this.node);
|
|
}
|
|
};
|
|
AsyncCompleteContext.prototype.descendantComplete = function (node) {
|
|
ko.utils.arrayRemoveItem(this.asyncDescendants, node);
|
|
if (!this.asyncDescendants.length && this.childrenComplete) {
|
|
this.completeChildren();
|
|
}
|
|
};
|
|
AsyncCompleteContext.prototype.completeChildren = function () {
|
|
this.childrenComplete = true;
|
|
if (this.bindingInfo.asyncContext && !this.asyncDescendants.length) {
|
|
this.bindingInfo.asyncContext = null;
|
|
ko.utils.domNodeDisposal.removeDisposeCallback(this.node, asyncContextDispose);
|
|
ko.bindingEvent.notify(this.node, ko.bindingEvent.descendantsComplete);
|
|
this.notifyAncestor();
|
|
}
|
|
};
|
|
|
|
ko.bindingEvent = {
|
|
childrenComplete: "childrenComplete",
|
|
descendantsComplete : "descendantsComplete",
|
|
|
|
subscribe: function (node, event, callback, context, options) {
|
|
var bindingInfo = ko.utils.domData.getOrSet(node, boundElementDomDataKey, {});
|
|
if (!bindingInfo.eventSubscribable) {
|
|
bindingInfo.eventSubscribable = new ko.subscribable;
|
|
}
|
|
if (options && options['notifyImmediately'] && bindingInfo.notifiedEvents[event]) {
|
|
ko.dependencyDetection.ignore(callback, context, [node]);
|
|
}
|
|
return bindingInfo.eventSubscribable.subscribe(callback, context, event);
|
|
},
|
|
|
|
notify: function (node, event) {
|
|
var bindingInfo = ko.utils.domData.get(node, boundElementDomDataKey);
|
|
if (bindingInfo) {
|
|
bindingInfo.notifiedEvents[event] = true;
|
|
if (bindingInfo.eventSubscribable) {
|
|
bindingInfo.eventSubscribable['notifySubscribers'](node, event);
|
|
}
|
|
if (event == ko.bindingEvent.childrenComplete) {
|
|
if (bindingInfo.asyncContext) {
|
|
bindingInfo.asyncContext.completeChildren();
|
|
} else if (bindingInfo.asyncContext === undefined && bindingInfo.eventSubscribable && bindingInfo.eventSubscribable.hasSubscriptionsForEvent(ko.bindingEvent.descendantsComplete)) {
|
|
// It's currently an error to register a descendantsComplete handler for a node that was never registered as completing asynchronously.
|
|
// That's because without the asyncContext, we don't have a way to know that all descendants have completed.
|
|
throw new Error("descendantsComplete event not supported for bindings on this node");
|
|
}
|
|
}
|
|
}
|
|
},
|
|
|
|
startPossiblyAsyncContentBinding: function (node, bindingContext) {
|
|
var bindingInfo = ko.utils.domData.getOrSet(node, boundElementDomDataKey, {});
|
|
|
|
if (!bindingInfo.asyncContext) {
|
|
bindingInfo.asyncContext = new AsyncCompleteContext(node, bindingInfo, bindingContext[contextAncestorBindingInfo]);
|
|
}
|
|
|
|
// If the provided context was already extended with this node's binding info, just return the extended context
|
|
if (bindingContext[contextAncestorBindingInfo] == bindingInfo) {
|
|
return bindingContext;
|
|
}
|
|
|
|
return bindingContext['extend'](function (ctx) {
|
|
ctx[contextAncestorBindingInfo] = bindingInfo;
|
|
});
|
|
}
|
|
};
|
|
|
|
// Returns the valueAccessor function for a binding value
|
|
function makeValueAccessor(value) {
|
|
return function() {
|
|
return value;
|
|
};
|
|
}
|
|
|
|
// Returns the value of a valueAccessor function
|
|
function evaluateValueAccessor(valueAccessor) {
|
|
return valueAccessor();
|
|
}
|
|
|
|
// Given a function that returns bindings, create and return a new object that contains
|
|
// binding value-accessors functions. Each accessor function calls the original function
|
|
// so that it always gets the latest value and all dependencies are captured. This is used
|
|
// by ko.applyBindingsToNode and getBindingsAndMakeAccessors.
|
|
function makeAccessorsFromFunction(callback) {
|
|
return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function(value, key) {
|
|
return function() {
|
|
return callback()[key];
|
|
};
|
|
});
|
|
}
|
|
|
|
// Given a bindings function or object, create and return a new object that contains
|
|
// binding value-accessors functions. This is used by ko.applyBindingsToNode.
|
|
function makeBindingAccessors(bindings, context, node) {
|
|
if (typeof bindings === 'function') {
|
|
return makeAccessorsFromFunction(bindings.bind(null, context, node));
|
|
} else {
|
|
return ko.utils.objectMap(bindings, makeValueAccessor);
|
|
}
|
|
}
|
|
|
|
// This function is used if the binding provider doesn't include a getBindingAccessors function.
|
|
// It must be called with 'this' set to the provider instance.
|
|
function getBindingsAndMakeAccessors(node, context) {
|
|
return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context));
|
|
}
|
|
|
|
function validateThatBindingIsAllowedForVirtualElements(bindingName) {
|
|
var validator = ko.virtualElements.allowedBindings[bindingName];
|
|
if (!validator)
|
|
throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
|
|
}
|
|
|
|
function applyBindingsToDescendantsInternal(bindingContext, elementOrVirtualElement) {
|
|
var nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
|
|
|
|
if (nextInQueue) {
|
|
var currentChild,
|
|
provider = ko.bindingProvider['instance'],
|
|
preprocessNode = provider['preprocessNode'];
|
|
|
|
// Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's
|
|
// possible to insert new siblings after it, and/or replace the node with a different one. This can be used to
|
|
// implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that
|
|
// trigger insertion of <template> contents at that point in the document.
|
|
if (preprocessNode) {
|
|
while (currentChild = nextInQueue) {
|
|
nextInQueue = ko.virtualElements.nextSibling(currentChild);
|
|
preprocessNode.call(provider, currentChild);
|
|
}
|
|
// Reset nextInQueue for the next loop
|
|
nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
|
|
}
|
|
|
|
while (currentChild = nextInQueue) {
|
|
// Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
|
|
nextInQueue = ko.virtualElements.nextSibling(currentChild);
|
|
applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild);
|
|
}
|
|
}
|
|
ko.bindingEvent.notify(elementOrVirtualElement, ko.bindingEvent.childrenComplete);
|
|
}
|
|
|
|
function applyBindingsToNodeAndDescendantsInternal(bindingContext, nodeVerified) {
|
|
var bindingContextForDescendants = bindingContext;
|
|
|
|
var isElement = (nodeVerified.nodeType === 1);
|
|
if (isElement) // Workaround IE <= 8 HTML parsing weirdness
|
|
ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
|
|
|
|
// Perf optimisation: Apply bindings only if...
|
|
// (1) We need to store the binding info for the node (all element nodes)
|
|
// (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
|
|
var shouldApplyBindings = isElement || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified);
|
|
if (shouldApplyBindings)
|
|
bindingContextForDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext)['bindingContextForDescendants'];
|
|
|
|
if (bindingContextForDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) {
|
|
applyBindingsToDescendantsInternal(bindingContextForDescendants, nodeVerified);
|
|
}
|
|
}
|
|
|
|
function topologicalSortBindings(bindings) {
|
|
// Depth-first sort
|
|
var result = [], // The list of key/handler pairs that we will return
|
|
bindingsConsidered = {}, // A temporary record of which bindings are already in 'result'
|
|
cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it
|
|
ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {
|
|
if (!bindingsConsidered[bindingKey]) {
|
|
var binding = ko['getBindingHandler'](bindingKey);
|
|
if (binding) {
|
|
// First add dependencies (if any) of the current binding
|
|
if (binding['after']) {
|
|
cyclicDependencyStack.push(bindingKey);
|
|
ko.utils.arrayForEach(binding['after'], function(bindingDependencyKey) {
|
|
if (bindings[bindingDependencyKey]) {
|
|
if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) {
|
|
throw Error("Cannot combine the following bindings, because they have a cyclic dependency: " + cyclicDependencyStack.join(", "));
|
|
} else {
|
|
pushBinding(bindingDependencyKey);
|
|
}
|
|
}
|
|
});
|
|
cyclicDependencyStack.length--;
|
|
}
|
|
// Next add the current binding
|
|
result.push({ key: bindingKey, handler: binding });
|
|
}
|
|
bindingsConsidered[bindingKey] = true;
|
|
}
|
|
});
|
|
|
|
return result;
|
|
}
|
|
|
|
function applyBindingsToNodeInternal(node, sourceBindings, bindingContext) {
|
|
var bindingInfo = ko.utils.domData.getOrSet(node, boundElementDomDataKey, {});
|
|
|
|
// Prevent multiple applyBindings calls for the same node, except when a binding value is specified
|
|
var alreadyBound = bindingInfo.alreadyBound;
|
|
if (!sourceBindings) {
|
|
if (alreadyBound) {
|
|
throw Error("You cannot apply bindings multiple times to the same element.");
|
|
}
|
|
bindingInfo.alreadyBound = true;
|
|
}
|
|
if (!alreadyBound) {
|
|
bindingInfo.context = bindingContext;
|
|
}
|
|
if (!bindingInfo.notifiedEvents) {
|
|
bindingInfo.notifiedEvents = {};
|
|
}
|
|
|
|
// Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings
|
|
var bindings;
|
|
if (sourceBindings && typeof sourceBindings !== 'function') {
|
|
bindings = sourceBindings;
|
|
} else {
|
|
var provider = ko.bindingProvider['instance'],
|
|
getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors;
|
|
|
|
// Get the binding from the provider within a computed observable so that we can update the bindings whenever
|
|
// the binding context is updated or if the binding provider accesses observables.
|
|
var bindingsUpdater = ko.dependentObservable(
|
|
function() {
|
|
bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext);
|
|
// Register a dependency on the binding context to support observable view models.
|
|
if (bindings) {
|
|
if (bindingContext[contextSubscribable]) {
|
|
bindingContext[contextSubscribable]();
|
|
}
|
|
if (bindingContext[contextDataDependency]) {
|
|
bindingContext[contextDataDependency]();
|
|
}
|
|
}
|
|
return bindings;
|
|
},
|
|
null, { disposeWhenNodeIsRemoved: node }
|
|
);
|
|
|
|
if (!bindings || !bindingsUpdater.isActive())
|
|
bindingsUpdater = null;
|
|
}
|
|
|
|
var contextToExtend = bindingContext;
|
|
var bindingHandlerThatControlsDescendantBindings;
|
|
if (bindings) {
|
|
// Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding
|
|
// context update), just return the value accessor from the binding. Otherwise, return a function that always gets
|
|
// the latest binding value and registers a dependency on the binding updater.
|
|
var getValueAccessor = bindingsUpdater
|
|
? function(bindingKey) {
|
|
return function() {
|
|
return evaluateValueAccessor(bindingsUpdater()[bindingKey]);
|
|
};
|
|
} : function(bindingKey) {
|
|
return bindings[bindingKey];
|
|
};
|
|
|
|
// Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated
|
|
function allBindings() {
|
|
return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor);
|
|
}
|
|
// The following is the 3.x allBindings API
|
|
allBindings['get'] = function(key) {
|
|
return bindings[key] && evaluateValueAccessor(getValueAccessor(key));
|
|
};
|
|
allBindings['has'] = function(key) {
|
|
return key in bindings;
|
|
};
|
|
|
|
if (ko.bindingEvent.childrenComplete in bindings) {
|
|
ko.bindingEvent.subscribe(node, ko.bindingEvent.childrenComplete, function () {
|
|
var callback = evaluateValueAccessor(bindings[ko.bindingEvent.childrenComplete]);
|
|
if (callback) {
|
|
var nodes = ko.virtualElements.childNodes(node);
|
|
if (nodes.length) {
|
|
callback(nodes, ko.dataFor(nodes[0]));
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
if (ko.bindingEvent.descendantsComplete in bindings) {
|
|
contextToExtend = ko.bindingEvent.startPossiblyAsyncContentBinding(node, bindingContext);
|
|
ko.bindingEvent.subscribe(node, ko.bindingEvent.descendantsComplete, function () {
|
|
var callback = evaluateValueAccessor(bindings[ko.bindingEvent.descendantsComplete]);
|
|
if (callback && ko.virtualElements.firstChild(node)) {
|
|
callback(node);
|
|
}
|
|
});
|
|
}
|
|
|
|
// First put the bindings into the right order
|
|
var orderedBindings = topologicalSortBindings(bindings);
|
|
|
|
// Go through the sorted bindings, calling init and update for each
|
|
ko.utils.arrayForEach(orderedBindings, function(bindingKeyAndHandler) {
|
|
// Note that topologicalSortBindings has already filtered out any nonexistent binding handlers,
|
|
// so bindingKeyAndHandler.handler will always be nonnull.
|
|
var handlerInitFn = bindingKeyAndHandler.handler["init"],
|
|
handlerUpdateFn = bindingKeyAndHandler.handler["update"],
|
|
bindingKey = bindingKeyAndHandler.key;
|
|
|
|
if (node.nodeType === 8) {
|
|
validateThatBindingIsAllowedForVirtualElements(bindingKey);
|
|
}
|
|
|
|
try {
|
|
// Run init, ignoring any dependencies
|
|
if (typeof handlerInitFn == "function") {
|
|
ko.dependencyDetection.ignore(function() {
|
|
var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, contextToExtend['$data'], contextToExtend);
|
|
|
|
// If this binding handler claims to control descendant bindings, make a note of this
|
|
if (initResult && initResult['controlsDescendantBindings']) {
|
|
if (bindingHandlerThatControlsDescendantBindings !== undefined)
|
|
throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
|
|
bindingHandlerThatControlsDescendantBindings = bindingKey;
|
|
}
|
|
});
|
|
}
|
|
|
|
// Run update in its own computed wrapper
|
|
if (typeof handlerUpdateFn == "function") {
|
|
ko.dependentObservable(
|
|
function() {
|
|
handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, contextToExtend['$data'], contextToExtend);
|
|
},
|
|
null,
|
|
{ disposeWhenNodeIsRemoved: node }
|
|
);
|
|
}
|
|
} catch (ex) {
|
|
ex.message = "Unable to process binding \"" + bindingKey + ": " + bindings[bindingKey] + "\"\nMessage: " + ex.message;
|
|
throw ex;
|
|
}
|
|
});
|
|
}
|
|
|
|
var shouldBindDescendants = bindingHandlerThatControlsDescendantBindings === undefined;
|
|
return {
|
|
'shouldBindDescendants': shouldBindDescendants,
|
|
'bindingContextForDescendants': shouldBindDescendants && contextToExtend
|
|
};
|
|
};
|
|
|
|
ko.storedBindingContextForNode = function (node) {
|
|
var bindingInfo = ko.utils.domData.get(node, boundElementDomDataKey);
|
|
return bindingInfo && bindingInfo.context;
|
|
}
|
|
|
|
function getBindingContext(viewModelOrBindingContext, extendContextCallback) {
|
|
return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
|
|
? viewModelOrBindingContext
|
|
: new ko.bindingContext(viewModelOrBindingContext, undefined, undefined, extendContextCallback);
|
|
}
|
|
|
|
ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) {
|
|
if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
|
|
ko.virtualElements.normaliseVirtualElementDomStructure(node);
|
|
return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext));
|
|
};
|
|
|
|
ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) {
|
|
var context = getBindingContext(viewModelOrBindingContext);
|
|
return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context);
|
|
};
|
|
|
|
ko.applyBindingsToDescendants = function(viewModelOrBindingContext, rootNode) {
|
|
if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
|
|
applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode);
|
|
};
|
|
|
|
ko.applyBindings = function (viewModelOrBindingContext, rootNode, extendContextCallback) {
|
|
// If jQuery is loaded after Knockout, we won't initially have access to it. So save it here.
|
|
if (!jQueryInstance && window['jQuery']) {
|
|
jQueryInstance = window['jQuery'];
|
|
}
|
|
|
|
if (arguments.length < 2) {
|
|
rootNode = document.body;
|
|
if (!rootNode) {
|
|
throw Error("ko.applyBindings: could not find document.body; has the document been loaded?");
|
|
}
|
|
} else if (!rootNode || (rootNode.nodeType !== 1 && rootNode.nodeType !== 8)) {
|
|
throw Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
|
|
}
|
|
|
|
applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext, extendContextCallback), rootNode);
|
|
};
|
|
|
|
// Retrieving binding context from arbitrary nodes
|
|
ko.contextFor = function(node) {
|
|
// We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
|
|
if (node && (node.nodeType === 1 || node.nodeType === 8)) {
|
|
return ko.storedBindingContextForNode(node);
|
|
}
|
|
return undefined;
|
|
};
|
|
ko.dataFor = function(node) {
|
|
var context = ko.contextFor(node);
|
|
return context ? context['$data'] : undefined;
|
|
};
|
|
|
|
ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
|
|
ko.exportSymbol('bindingEvent', ko.bindingEvent);
|
|
ko.exportSymbol('bindingEvent.subscribe', ko.bindingEvent.subscribe);
|
|
ko.exportSymbol('bindingEvent.startPossiblyAsyncContentBinding', ko.bindingEvent.startPossiblyAsyncContentBinding);
|
|
ko.exportSymbol('applyBindings', ko.applyBindings);
|
|
ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
|
|
ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode);
|
|
ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
|
|
ko.exportSymbol('contextFor', ko.contextFor);
|
|
ko.exportSymbol('dataFor', ko.dataFor);
|
|
})();
|
|
(function(undefined) {
|
|
var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight
|
|
loadedDefinitionsCache = {}; // Tracks component loads that have already completed
|
|
|
|
ko.components = {
|
|
get: function(componentName, callback) {
|
|
var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);
|
|
if (cachedDefinition) {
|
|
// It's already loaded and cached. Reuse the same definition object.
|
|
// Note that for API consistency, even cache hits complete asynchronously by default.
|
|
// You can bypass this by putting synchronous:true on your component config.
|
|
if (cachedDefinition.isSynchronousComponent) {
|
|
ko.dependencyDetection.ignore(function() { // See comment in loaderRegistryBehaviors.js for reasoning
|
|
callback(cachedDefinition.definition);
|
|
});
|
|
} else {
|
|
ko.tasks.schedule(function() { callback(cachedDefinition.definition); });
|
|
}
|
|
} else {
|
|
// Join the loading process that is already underway, or start a new one.
|
|
loadComponentAndNotify(componentName, callback);
|
|
}
|
|
},
|
|
|
|
clearCachedDefinition: function(componentName) {
|
|
delete loadedDefinitionsCache[componentName];
|
|
},
|
|
|
|
_getFirstResultFromLoaders: getFirstResultFromLoaders
|
|
};
|
|
|
|
function getObjectOwnProperty(obj, propName) {
|
|
return Object.prototype.hasOwnProperty.call(obj, propName) ? obj[propName] : undefined;
|
|
}
|
|
|
|
function loadComponentAndNotify(componentName, callback) {
|
|
var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),
|
|
completedAsync;
|
|
if (!subscribable) {
|
|
// It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.
|
|
subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();
|
|
subscribable.subscribe(callback);
|
|
|
|
beginLoadingComponent(componentName, function(definition, config) {
|
|
var isSynchronousComponent = !!(config && config['synchronous']);
|
|
loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };
|
|
delete loadingSubscribablesCache[componentName];
|
|
|
|
// For API consistency, all loads complete asynchronously. However we want to avoid
|
|
// adding an extra task schedule if it's unnecessary (i.e., the completion is already
|
|
// async).
|
|
//
|
|
// You can bypass the 'always asynchronous' feature by putting the synchronous:true
|
|
// flag on your component configuration when you register it.
|
|
if (completedAsync || isSynchronousComponent) {
|
|
// Note that notifySubscribers ignores any dependencies read within the callback.
|
|
// See comment in loaderRegistryBehaviors.js for reasoning
|
|
subscribable['notifySubscribers'](definition);
|
|
} else {
|
|
ko.tasks.schedule(function() {
|
|
subscribable['notifySubscribers'](definition);
|
|
});
|
|
}
|
|
});
|
|
completedAsync = true;
|
|
} else {
|
|
subscribable.subscribe(callback);
|
|
}
|
|
}
|
|
|
|
function beginLoadingComponent(componentName, callback) {
|
|
getFirstResultFromLoaders('getConfig', [componentName], function(config) {
|
|
if (config) {
|
|
// We have a config, so now load its definition
|
|
getFirstResultFromLoaders('loadComponent', [componentName, config], function(definition) {
|
|
callback(definition, config);
|
|
});
|
|
} else {
|
|
// The component has no config - it's unknown to all the loaders.
|
|
// Note that this is not an error (e.g., a module loading error) - that would abort the
|
|
// process and this callback would not run. For this callback to run, all loaders must
|
|
// have confirmed they don't know about this component.
|
|
callback(null, null);
|
|
}
|
|
});
|
|
}
|
|
|
|
function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {
|
|
// On the first call in the stack, start with the full set of loaders
|
|
if (!candidateLoaders) {
|
|
candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array
|
|
}
|
|
|
|
// Try the next candidate
|
|
var currentCandidateLoader = candidateLoaders.shift();
|
|
if (currentCandidateLoader) {
|
|
var methodInstance = currentCandidateLoader[methodName];
|
|
if (methodInstance) {
|
|
var wasAborted = false,
|
|
synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) {
|
|
if (wasAborted) {
|
|
callback(null);
|
|
} else if (result !== null) {
|
|
// This candidate returned a value. Use it.
|
|
callback(result);
|
|
} else {
|
|
// Try the next candidate
|
|
getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
|
|
}
|
|
}));
|
|
|
|
// Currently, loaders may not return anything synchronously. This leaves open the possibility
|
|
// that we'll extend the API to support synchronous return values in the future. It won't be
|
|
// a breaking change, because currently no loader is allowed to return anything except undefined.
|
|
if (synchronousReturnValue !== undefined) {
|
|
wasAborted = true;
|
|
|
|
// Method to suppress exceptions will remain undocumented. This is only to keep
|
|
// KO's specs running tidily, since we can observe the loading got aborted without
|
|
// having exceptions cluttering up the console too.
|
|
if (!currentCandidateLoader['suppressLoaderExceptions']) {
|
|
throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');
|
|
}
|
|
}
|
|
} else {
|
|
// This candidate doesn't have the relevant handler. Synchronously move on to the next one.
|
|
getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
|
|
}
|
|
} else {
|
|
// No candidates returned a value
|
|
callback(null);
|
|
}
|
|
}
|
|
|
|
// Reference the loaders via string name so it's possible for developers
|
|
// to replace the whole array by assigning to ko.components.loaders
|
|
ko.components['loaders'] = [];
|
|
|
|
ko.exportSymbol('components', ko.components);
|
|
ko.exportSymbol('components.get', ko.components.get);
|
|
ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition);
|
|
})();
|
|
(function(undefined) {
|
|
|
|
// The default loader is responsible for two things:
|
|
// 1. Maintaining the default in-memory registry of component configuration objects
|
|
// (i.e., the thing you're writing to when you call ko.components.register(someName, ...))
|
|
// 2. Answering requests for components by fetching configuration objects
|
|
// from that default in-memory registry and resolving them into standard
|
|
// component definition objects (of the form { createViewModel: ..., template: ... })
|
|
// Custom loaders may override either of these facilities, i.e.,
|
|
// 1. To supply configuration objects from some other source (e.g., conventions)
|
|
// 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.
|
|
|
|
var defaultConfigRegistry = {};
|
|
|
|
ko.components.register = function(componentName, config) {
|
|
if (!config) {
|
|
throw new Error('Invalid configuration for ' + componentName);
|
|
}
|
|
|
|
if (ko.components.isRegistered(componentName)) {
|
|
throw new Error('Component ' + componentName + ' is already registered');
|
|
}
|
|
|
|
defaultConfigRegistry[componentName] = config;
|
|
};
|
|
|
|
ko.components.isRegistered = function(componentName) {
|
|
return Object.prototype.hasOwnProperty.call(defaultConfigRegistry, componentName);
|
|
};
|
|
|
|
ko.components.unregister = function(componentName) {
|
|
delete defaultConfigRegistry[componentName];
|
|
ko.components.clearCachedDefinition(componentName);
|
|
};
|
|
|
|
ko.components.defaultLoader = {
|
|
'getConfig': function(componentName, callback) {
|
|
var result = ko.components.isRegistered(componentName)
|
|
? defaultConfigRegistry[componentName]
|
|
: null;
|
|
callback(result);
|
|
},
|
|
|
|
'loadComponent': function(componentName, config, callback) {
|
|
var errorCallback = makeErrorCallback(componentName);
|
|
possiblyGetConfigFromAmd(errorCallback, config, function(loadedConfig) {
|
|
resolveConfig(componentName, errorCallback, loadedConfig, callback);
|
|
});
|
|
},
|
|
|
|
'loadTemplate': function(componentName, templateConfig, callback) {
|
|
resolveTemplate(makeErrorCallback(componentName), templateConfig, callback);
|
|
},
|
|
|
|
'loadViewModel': function(componentName, viewModelConfig, callback) {
|
|
resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback);
|
|
}
|
|
};
|
|
|
|
var createViewModelKey = 'createViewModel';
|
|
|
|
// Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it
|
|
// into the standard component definition format:
|
|
// { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.
|
|
// Since both template and viewModel may need to be resolved asynchronously, both tasks are performed
|
|
// in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,
|
|
// so this is implemented manually below.
|
|
function resolveConfig(componentName, errorCallback, config, callback) {
|
|
var result = {},
|
|
makeCallBackWhenZero = 2,
|
|
tryIssueCallback = function() {
|
|
if (--makeCallBackWhenZero === 0) {
|
|
callback(result);
|
|
}
|
|
},
|
|
templateConfig = config['template'],
|
|
viewModelConfig = config['viewModel'];
|
|
|
|
if (templateConfig) {
|
|
possiblyGetConfigFromAmd(errorCallback, templateConfig, function(loadedConfig) {
|
|
ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function(resolvedTemplate) {
|
|
result['template'] = resolvedTemplate;
|
|
tryIssueCallback();
|
|
});
|
|
});
|
|
} else {
|
|
tryIssueCallback();
|
|
}
|
|
|
|
if (viewModelConfig) {
|
|
possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function(loadedConfig) {
|
|
ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function(resolvedViewModel) {
|
|
result[createViewModelKey] = resolvedViewModel;
|
|
tryIssueCallback();
|
|
});
|
|
});
|
|
} else {
|
|
tryIssueCallback();
|
|
}
|
|
}
|
|
|
|
function resolveTemplate(errorCallback, templateConfig, callback) {
|
|
if (typeof templateConfig === 'string') {
|
|
// Markup - parse it
|
|
callback(ko.utils.parseHtmlFragment(templateConfig));
|
|
} else if (templateConfig instanceof Array) {
|
|
// Assume already an array of DOM nodes - pass through unchanged
|
|
callback(templateConfig);
|
|
} else if (isDocumentFragment(templateConfig)) {
|
|
// Document fragment - use its child nodes
|
|
callback(ko.utils.makeArray(templateConfig.childNodes));
|
|
} else if (templateConfig['element']) {
|
|
var element = templateConfig['element'];
|
|
if (isDomElement(element)) {
|
|
// Element instance - copy its child nodes
|
|
callback(cloneNodesFromTemplateSourceElement(element));
|
|
} else if (typeof element === 'string') {
|
|
// Element ID - find it, then copy its child nodes
|
|
var elemInstance = document.getElementById(element);
|
|
if (elemInstance) {
|
|
callback(cloneNodesFromTemplateSourceElement(elemInstance));
|
|
} else {
|
|
errorCallback('Cannot find element with ID ' + element);
|
|
}
|
|
} else {
|
|
errorCallback('Unknown element type: ' + element);
|
|
}
|
|
} else {
|
|
errorCallback('Unknown template value: ' + templateConfig);
|
|
}
|
|
}
|
|
|
|
function resolveViewModel(errorCallback, viewModelConfig, callback) {
|
|
if (typeof viewModelConfig === 'function') {
|
|
// Constructor - convert to standard factory function format
|
|
// By design, this does *not* supply componentInfo to the constructor, as the intent is that
|
|
// componentInfo contains non-viewmodel data (e.g., the component's element) that should only
|
|
// be used in factory functions, not viewmodel constructors.
|
|
callback(function (params /*, componentInfo */) {
|
|
return new viewModelConfig(params);
|
|
});
|
|
} else if (typeof viewModelConfig[createViewModelKey] === 'function') {
|
|
// Already a factory function - use it as-is
|
|
callback(viewModelConfig[createViewModelKey]);
|
|
} else if ('instance' in viewModelConfig) {
|
|
// Fixed object instance - promote to createViewModel format for API consistency
|
|
var fixedInstance = viewModelConfig['instance'];
|
|
callback(function (params, componentInfo) {
|
|
return fixedInstance;
|
|
});
|
|
} else if ('viewModel' in viewModelConfig) {
|
|
// Resolved AMD module whose value is of the form { viewModel: ... }
|
|
resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback);
|
|
} else {
|
|
errorCallback('Unknown viewModel value: ' + viewModelConfig);
|
|
}
|
|
}
|
|
|
|
function cloneNodesFromTemplateSourceElement(elemInstance) {
|
|
switch (ko.utils.tagNameLower(elemInstance)) {
|
|
case 'script':
|
|
return ko.utils.parseHtmlFragment(elemInstance.text);
|
|
case 'textarea':
|
|
return ko.utils.parseHtmlFragment(elemInstance.value);
|
|
case 'template':
|
|
// For browsers with proper <template> element support (i.e., where the .content property
|
|
// gives a document fragment), use that document fragment.
|
|
if (isDocumentFragment(elemInstance.content)) {
|
|
return ko.utils.cloneNodes(elemInstance.content.childNodes);
|
|
}
|
|
}
|
|
|
|
// Regular elements such as <div>, and <template> elements on old browsers that don't really
|
|
// understand <template> and just treat it as a regular container
|
|
return ko.utils.cloneNodes(elemInstance.childNodes);
|
|
}
|
|
|
|
function isDomElement(obj) {
|
|
if (window['HTMLElement']) {
|
|
return obj instanceof HTMLElement;
|
|
} else {
|
|
return obj && obj.tagName && obj.nodeType === 1;
|
|
}
|
|
}
|
|
|
|
function isDocumentFragment(obj) {
|
|
if (window['DocumentFragment']) {
|
|
return obj instanceof DocumentFragment;
|
|
} else {
|
|
return obj && obj.nodeType === 11;
|
|
}
|
|
}
|
|
|
|
function possiblyGetConfigFromAmd(errorCallback, config, callback) {
|
|
if (typeof config['require'] === 'string') {
|
|
// The config is the value of an AMD module
|
|
if (amdRequire || window['require']) {
|
|
(amdRequire || window['require'])([config['require']], function (module) {
|
|
if (module && typeof module === 'object' && module.__esModule && module.default) {
|
|
module = module.default;
|
|
}
|
|
callback(module);
|
|
});
|
|
} else {
|
|
errorCallback('Uses require, but no AMD loader is present');
|
|
}
|
|
} else {
|
|
callback(config);
|
|
}
|
|
}
|
|
|
|
function makeErrorCallback(componentName) {
|
|
return function (message) {
|
|
throw new Error('Component \'' + componentName + '\': ' + message);
|
|
};
|
|
}
|
|
|
|
ko.exportSymbol('components.register', ko.components.register);
|
|
ko.exportSymbol('components.isRegistered', ko.components.isRegistered);
|
|
ko.exportSymbol('components.unregister', ko.components.unregister);
|
|
|
|
// Expose the default loader so that developers can directly ask it for configuration
|
|
// or to resolve configuration
|
|
ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader);
|
|
|
|
// By default, the default loader is the only registered component loader
|
|
ko.components['loaders'].push(ko.components.defaultLoader);
|
|
|
|
// Privately expose the underlying config registry for use in old-IE shim
|
|
ko.components._allRegisteredComponents = defaultConfigRegistry;
|
|
})();
|
|
(function (undefined) {
|
|
// Overridable API for determining which component name applies to a given node. By overriding this,
|
|
// you can for example map specific tagNames to components that are not preregistered.
|
|
ko.components['getComponentNameForNode'] = function(node) {
|
|
var tagNameLower = ko.utils.tagNameLower(node);
|
|
if (ko.components.isRegistered(tagNameLower)) {
|
|
// Try to determine that this node can be considered a *custom* element; see https://github.com/knockout/knockout/issues/1603
|
|
if (tagNameLower.indexOf('-') != -1 || ('' + node) == "[object HTMLUnknownElement]" || (ko.utils.ieVersion <= 8 && node.tagName === tagNameLower)) {
|
|
return tagNameLower;
|
|
}
|
|
}
|
|
};
|
|
|
|
ko.components.addBindingsForCustomElement = function(allBindings, node, bindingContext, valueAccessors) {
|
|
// Determine if it's really a custom element matching a component
|
|
if (node.nodeType === 1) {
|
|
var componentName = ko.components['getComponentNameForNode'](node);
|
|
if (componentName) {
|
|
// It does represent a component, so add a component binding for it
|
|
allBindings = allBindings || {};
|
|
|
|
if (allBindings['component']) {
|
|
// Avoid silently overwriting some other 'component' binding that may already be on the element
|
|
throw new Error('Cannot use the "component" binding on a custom element matching a component');
|
|
}
|
|
|
|
var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) };
|
|
|
|
allBindings['component'] = valueAccessors
|
|
? function() { return componentBindingValue; }
|
|
: componentBindingValue;
|
|
}
|
|
}
|
|
|
|
return allBindings;
|
|
}
|
|
|
|
var nativeBindingProviderInstance = new ko.bindingProvider();
|
|
|
|
function getComponentParamsFromCustomElement(elem, bindingContext) {
|
|
var paramsAttribute = elem.getAttribute('params');
|
|
|
|
if (paramsAttribute) {
|
|
var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }),
|
|
rawParamComputedValues = ko.utils.objectMap(params, function(paramValue, paramName) {
|
|
return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem });
|
|
}),
|
|
result = ko.utils.objectMap(rawParamComputedValues, function(paramValueComputed, paramName) {
|
|
var paramValue = paramValueComputed.peek();
|
|
// Does the evaluation of the parameter value unwrap any observables?
|
|
if (!paramValueComputed.isActive()) {
|
|
// No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly.
|
|
// Example: "someVal: firstName, age: 123" (whether or not firstName is an observable/computed)
|
|
return paramValue;
|
|
} else {
|
|
// Yes it does. Supply a computed property that unwraps both the outer (binding expression)
|
|
// level of observability, and any inner (resulting model value) level of observability.
|
|
// This means the component doesn't have to worry about multiple unwrapping. If the value is a
|
|
// writable observable, the computed will also be writable and pass the value on to the observable.
|
|
return ko.computed({
|
|
'read': function() {
|
|
return ko.utils.unwrapObservable(paramValueComputed());
|
|
},
|
|
'write': ko.isWriteableObservable(paramValue) && function(value) {
|
|
paramValueComputed()(value);
|
|
},
|
|
disposeWhenNodeIsRemoved: elem
|
|
});
|
|
}
|
|
});
|
|
|
|
// Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw'
|
|
// This is in case the developer wants to react to outer (binding) observability separately from inner
|
|
// (model value) observability, or in case the model value observable has subobservables.
|
|
if (!Object.prototype.hasOwnProperty.call(result, '$raw')) {
|
|
result['$raw'] = rawParamComputedValues;
|
|
}
|
|
|
|
return result;
|
|
} else {
|
|
// For consistency, absence of a "params" attribute is treated the same as the presence of
|
|
// any empty one. Otherwise component viewmodels need special code to check whether or not
|
|
// 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying.
|
|
return { '$raw': {} };
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------------------
|
|
// Compatibility code for older (pre-HTML5) IE browsers
|
|
|
|
if (ko.utils.ieVersion < 9) {
|
|
// Whenever you preregister a component, enable it as a custom element in the current document
|
|
ko.components['register'] = (function(originalFunction) {
|
|
return function(componentName) {
|
|
document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element
|
|
return originalFunction.apply(this, arguments);
|
|
}
|
|
})(ko.components['register']);
|
|
|
|
// Whenever you create a document fragment, enable all preregistered component names as custom elements
|
|
// This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements
|
|
document.createDocumentFragment = (function(originalFunction) {
|
|
return function() {
|
|
var newDocFrag = originalFunction(),
|
|
allComponents = ko.components._allRegisteredComponents;
|
|
for (var componentName in allComponents) {
|
|
if (Object.prototype.hasOwnProperty.call(allComponents, componentName)) {
|
|
newDocFrag.createElement(componentName);
|
|
}
|
|
}
|
|
return newDocFrag;
|
|
};
|
|
})(document.createDocumentFragment);
|
|
}
|
|
})();(function(undefined) {
|
|
var componentLoadingOperationUniqueId = 0;
|
|
|
|
ko.bindingHandlers['component'] = {
|
|
'init': function(element, valueAccessor, ignored1, ignored2, bindingContext) {
|
|
var currentViewModel,
|
|
currentLoadingOperationId,
|
|
afterRenderSub,
|
|
disposeAssociatedComponentViewModel = function () {
|
|
var currentViewModelDispose = currentViewModel && currentViewModel['dispose'];
|
|
if (typeof currentViewModelDispose === 'function') {
|
|
currentViewModelDispose.call(currentViewModel);
|
|
}
|
|
if (afterRenderSub) {
|
|
afterRenderSub.dispose();
|
|
}
|
|
afterRenderSub = null;
|
|
currentViewModel = null;
|
|
// Any in-flight loading operation is no longer relevant, so make sure we ignore its completion
|
|
currentLoadingOperationId = null;
|
|
},
|
|
originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element));
|
|
|
|
ko.virtualElements.emptyNode(element);
|
|
ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel);
|
|
|
|
ko.computed(function () {
|
|
var value = ko.utils.unwrapObservable(valueAccessor()),
|
|
componentName, componentParams;
|
|
|
|
if (typeof value === 'string') {
|
|
componentName = value;
|
|
} else {
|
|
componentName = ko.utils.unwrapObservable(value['name']);
|
|
componentParams = ko.utils.unwrapObservable(value['params']);
|
|
}
|
|
|
|
if (!componentName) {
|
|
throw new Error('No component name specified');
|
|
}
|
|
|
|
var asyncContext = ko.bindingEvent.startPossiblyAsyncContentBinding(element, bindingContext);
|
|
|
|
var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId;
|
|
ko.components.get(componentName, function(componentDefinition) {
|
|
// If this is not the current load operation for this element, ignore it.
|
|
if (currentLoadingOperationId !== loadingOperationId) {
|
|
return;
|
|
}
|
|
|
|
// Clean up previous state
|
|
disposeAssociatedComponentViewModel();
|
|
|
|
// Instantiate and bind new component. Implicitly this cleans any old DOM nodes.
|
|
if (!componentDefinition) {
|
|
throw new Error('Unknown component \'' + componentName + '\'');
|
|
}
|
|
cloneTemplateIntoElement(componentName, componentDefinition, element);
|
|
|
|
var componentInfo = {
|
|
'element': element,
|
|
'templateNodes': originalChildNodes
|
|
};
|
|
|
|
var componentViewModel = createViewModel(componentDefinition, componentParams, componentInfo),
|
|
childBindingContext = asyncContext['createChildContext'](componentViewModel, {
|
|
'extend': function(ctx) {
|
|
ctx['$component'] = componentViewModel;
|
|
ctx['$componentTemplateNodes'] = originalChildNodes;
|
|
}
|
|
});
|
|
|
|
if (componentViewModel && componentViewModel['koDescendantsComplete']) {
|
|
afterRenderSub = ko.bindingEvent.subscribe(element, ko.bindingEvent.descendantsComplete, componentViewModel['koDescendantsComplete'], componentViewModel);
|
|
}
|
|
|
|
currentViewModel = componentViewModel;
|
|
ko.applyBindingsToDescendants(childBindingContext, element);
|
|
});
|
|
}, null, { disposeWhenNodeIsRemoved: element });
|
|
|
|
return { 'controlsDescendantBindings': true };
|
|
}
|
|
};
|
|
|
|
ko.virtualElements.allowedBindings['component'] = true;
|
|
|
|
function cloneTemplateIntoElement(componentName, componentDefinition, element) {
|
|
var template = componentDefinition['template'];
|
|
if (!template) {
|
|
throw new Error('Component \'' + componentName + '\' has no template');
|
|
}
|
|
|
|
var clonedNodesArray = ko.utils.cloneNodes(template);
|
|
ko.virtualElements.setDomNodeChildren(element, clonedNodesArray);
|
|
}
|
|
|
|
function createViewModel(componentDefinition, componentParams, componentInfo) {
|
|
var componentViewModelFactory = componentDefinition['createViewModel'];
|
|
return componentViewModelFactory
|
|
? componentViewModelFactory.call(componentDefinition, componentParams, componentInfo)
|
|
: componentParams; // Template-only component
|
|
}
|
|
|
|
})();
|
|
var attrHtmlToJavaScriptMap = { 'class': 'className', 'for': 'htmlFor' };
|
|
ko.bindingHandlers['attr'] = {
|
|
'update': function(element, valueAccessor, allBindings) {
|
|
var value = ko.utils.unwrapObservable(valueAccessor()) || {};
|
|
ko.utils.objectForEach(value, function(attrName, attrValue) {
|
|
attrValue = ko.utils.unwrapObservable(attrValue);
|
|
|
|
// Find the namespace of this attribute, if any.
|
|
var prefixLen = attrName.indexOf(':');
|
|
var namespace = "lookupNamespaceURI" in element && prefixLen > 0 && element.lookupNamespaceURI(attrName.substr(0, prefixLen));
|
|
|
|
// To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
|
|
// when someProp is a "no value"-like value (strictly null, false, or undefined)
|
|
// (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
|
|
var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
|
|
if (toRemove) {
|
|
namespace ? element.removeAttributeNS(namespace, attrName) : element.removeAttribute(attrName);
|
|
} else {
|
|
attrValue = attrValue.toString();
|
|
}
|
|
|
|
// In IE <= 7 and IE8 Quirks Mode, you have to use the JavaScript property name instead of the
|
|
// HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
|
|
// but instead of figuring out the mode, we'll just set the attribute through the JavaScript
|
|
// property for IE <= 8.
|
|
if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavaScriptMap) {
|
|
attrName = attrHtmlToJavaScriptMap[attrName];
|
|
if (toRemove)
|
|
element.removeAttribute(attrName);
|
|
else
|
|
element[attrName] = attrValue;
|
|
} else if (!toRemove) {
|
|
namespace ? element.setAttributeNS(namespace, attrName, attrValue) : element.setAttribute(attrName, attrValue);
|
|
}
|
|
|
|
// Treat "name" specially - although you can think of it as an attribute, it also needs
|
|
// special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
|
|
// Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
|
|
// entirely, and there's no strong reason to allow for such casing in HTML.
|
|
if (attrName === "name") {
|
|
ko.utils.setElementName(element, toRemove ? "" : attrValue);
|
|
}
|
|
});
|
|
}
|
|
};
|
|
(function() {
|
|
|
|
ko.bindingHandlers['checked'] = {
|
|
'after': ['value', 'attr'],
|
|
'init': function (element, valueAccessor, allBindings) {
|
|
var checkedValue = ko.pureComputed(function() {
|
|
// Treat "value" like "checkedValue" when it is included with "checked" binding
|
|
if (allBindings['has']('checkedValue')) {
|
|
return ko.utils.unwrapObservable(allBindings.get('checkedValue'));
|
|
} else if (useElementValue) {
|
|
if (allBindings['has']('value')) {
|
|
return ko.utils.unwrapObservable(allBindings.get('value'));
|
|
} else {
|
|
return element.value;
|
|
}
|
|
}
|
|
});
|
|
|
|
function updateModel() {
|
|
// This updates the model value from the view value.
|
|
// It runs in response to DOM events (click) and changes in checkedValue.
|
|
var isChecked = element.checked,
|
|
elemValue = checkedValue();
|
|
|
|
// When we're first setting up this computed, don't change any model state.
|
|
if (ko.computedContext.isInitial()) {
|
|
return;
|
|
}
|
|
|
|
// We can ignore unchecked radio buttons, because some other radio
|
|
// button will be checked, and that one can take care of updating state.
|
|
// Also ignore value changes to an already unchecked checkbox.
|
|
if (!isChecked && (isRadio || ko.computedContext.getDependenciesCount())) {
|
|
return;
|
|
}
|
|
|
|
var modelValue = ko.dependencyDetection.ignore(valueAccessor);
|
|
if (valueIsArray) {
|
|
var writableValue = rawValueIsNonArrayObservable ? modelValue.peek() : modelValue,
|
|
saveOldValue = oldElemValue;
|
|
oldElemValue = elemValue;
|
|
|
|
if (saveOldValue !== elemValue) {
|
|
// When we're responding to the checkedValue changing, and the element is
|
|
// currently checked, replace the old elem value with the new elem value
|
|
// in the model array.
|
|
if (isChecked) {
|
|
ko.utils.addOrRemoveItem(writableValue, elemValue, true);
|
|
ko.utils.addOrRemoveItem(writableValue, saveOldValue, false);
|
|
}
|
|
} else {
|
|
// When we're responding to the user having checked/unchecked a checkbox,
|
|
// add/remove the element value to the model array.
|
|
ko.utils.addOrRemoveItem(writableValue, elemValue, isChecked);
|
|
}
|
|
|
|
if (rawValueIsNonArrayObservable && ko.isWriteableObservable(modelValue)) {
|
|
modelValue(writableValue);
|
|
}
|
|
} else {
|
|
if (isCheckbox) {
|
|
if (elemValue === undefined) {
|
|
elemValue = isChecked;
|
|
} else if (!isChecked) {
|
|
elemValue = undefined;
|
|
}
|
|
}
|
|
ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);
|
|
}
|
|
};
|
|
|
|
function updateView() {
|
|
// This updates the view value from the model value.
|
|
// It runs in response to changes in the bound (checked) value.
|
|
var modelValue = ko.utils.unwrapObservable(valueAccessor()),
|
|
elemValue = checkedValue();
|
|
|
|
if (valueIsArray) {
|
|
// When a checkbox is bound to an array, being checked represents its value being present in that array
|
|
element.checked = ko.utils.arrayIndexOf(modelValue, elemValue) >= 0;
|
|
oldElemValue = elemValue;
|
|
} else if (isCheckbox && elemValue === undefined) {
|
|
// When a checkbox is bound to any other value (not an array) and "checkedValue" is not defined,
|
|
// being checked represents the value being trueish
|
|
element.checked = !!modelValue;
|
|
} else {
|
|
// Otherwise, being checked means that the checkbox or radio button's value corresponds to the model value
|
|
element.checked = (checkedValue() === modelValue);
|
|
}
|
|
};
|
|
|
|
var isCheckbox = element.type == "checkbox",
|
|
isRadio = element.type == "radio";
|
|
|
|
// Only bind to check boxes and radio buttons
|
|
if (!isCheckbox && !isRadio) {
|
|
return;
|
|
}
|
|
|
|
var rawValue = valueAccessor(),
|
|
valueIsArray = isCheckbox && (ko.utils.unwrapObservable(rawValue) instanceof Array),
|
|
rawValueIsNonArrayObservable = !(valueIsArray && rawValue.push && rawValue.splice),
|
|
useElementValue = isRadio || valueIsArray,
|
|
oldElemValue = valueIsArray ? checkedValue() : undefined;
|
|
|
|
// IE 6 won't allow radio buttons to be selected unless they have a name
|
|
if (isRadio && !element.name)
|
|
ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
|
|
|
|
// Set up two computeds to update the binding:
|
|
|
|
// The first responds to changes in the checkedValue value and to element clicks
|
|
ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });
|
|
ko.utils.registerEventHandler(element, "click", updateModel);
|
|
|
|
// The second responds to changes in the model value (the one associated with the checked binding)
|
|
ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
|
|
|
|
rawValue = undefined;
|
|
}
|
|
};
|
|
ko.expressionRewriting.twoWayBindings['checked'] = true;
|
|
|
|
ko.bindingHandlers['checkedValue'] = {
|
|
'update': function (element, valueAccessor) {
|
|
element.value = ko.utils.unwrapObservable(valueAccessor());
|
|
}
|
|
};
|
|
|
|
})();var classesWrittenByBindingKey = '__ko__cssValue';
|
|
ko.bindingHandlers['class'] = {
|
|
'update': function (element, valueAccessor) {
|
|
var value = ko.utils.stringTrim(ko.utils.unwrapObservable(valueAccessor()));
|
|
ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
|
|
element[classesWrittenByBindingKey] = value;
|
|
ko.utils.toggleDomNodeCssClass(element, value, true);
|
|
}
|
|
};
|
|
|
|
ko.bindingHandlers['css'] = {
|
|
'update': function (element, valueAccessor) {
|
|
var value = ko.utils.unwrapObservable(valueAccessor());
|
|
if (value !== null && typeof value == "object") {
|
|
ko.utils.objectForEach(value, function(className, shouldHaveClass) {
|
|
shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);
|
|
ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
|
|
});
|
|
} else {
|
|
ko.bindingHandlers['class']['update'](element, valueAccessor);
|
|
}
|
|
}
|
|
};
|
|
ko.bindingHandlers['enable'] = {
|
|
'update': function (element, valueAccessor) {
|
|
var value = ko.utils.unwrapObservable(valueAccessor());
|
|
if (value && element.disabled)
|
|
element.removeAttribute("disabled");
|
|
else if ((!value) && (!element.disabled))
|
|
element.disabled = true;
|
|
}
|
|
};
|
|
|
|
ko.bindingHandlers['disable'] = {
|
|
'update': function (element, valueAccessor) {
|
|
ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
|
|
}
|
|
};
|
|
// For certain common events (currently just 'click'), allow a simplified data-binding syntax
|
|
// e.g. click:handler instead of the usual full-length event:{click:handler}
|
|
function makeEventHandlerShortcut(eventName) {
|
|
ko.bindingHandlers[eventName] = {
|
|
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
var newValueAccessor = function () {
|
|
var result = {};
|
|
result[eventName] = valueAccessor();
|
|
return result;
|
|
};
|
|
return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);
|
|
}
|
|
}
|
|
}
|
|
|
|
ko.bindingHandlers['event'] = {
|
|
'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
var eventsToHandle = valueAccessor() || {};
|
|
ko.utils.objectForEach(eventsToHandle, function(eventName) {
|
|
if (typeof eventName == "string") {
|
|
ko.utils.registerEventHandler(element, eventName, function (event) {
|
|
var handlerReturnValue;
|
|
var handlerFunction = valueAccessor()[eventName];
|
|
if (!handlerFunction)
|
|
return;
|
|
|
|
try {
|
|
// Take all the event args, and prefix with the viewmodel
|
|
var argsForHandler = ko.utils.makeArray(arguments);
|
|
viewModel = bindingContext['$data'];
|
|
argsForHandler.unshift(viewModel);
|
|
handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
|
|
} finally {
|
|
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
|
|
if (event.preventDefault)
|
|
event.preventDefault();
|
|
else
|
|
event.returnValue = false;
|
|
}
|
|
}
|
|
|
|
var bubble = allBindings.get(eventName + 'Bubble') !== false;
|
|
if (!bubble) {
|
|
event.cancelBubble = true;
|
|
if (event.stopPropagation)
|
|
event.stopPropagation();
|
|
}
|
|
});
|
|
}
|
|
});
|
|
}
|
|
};
|
|
// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
|
|
// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
|
|
ko.bindingHandlers['foreach'] = {
|
|
makeTemplateValueAccessor: function(valueAccessor) {
|
|
return function() {
|
|
var modelValue = valueAccessor(),
|
|
unwrappedValue = ko.utils.peekObservable(modelValue); // Unwrap without setting a dependency here
|
|
|
|
// If unwrappedValue is the array, pass in the wrapped value on its own
|
|
// The value will be unwrapped and tracked within the template binding
|
|
// (See https://github.com/SteveSanderson/knockout/issues/523)
|
|
if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
|
|
return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
|
|
|
|
// If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
|
|
ko.utils.unwrapObservable(modelValue);
|
|
return {
|
|
'foreach': unwrappedValue['data'],
|
|
'as': unwrappedValue['as'],
|
|
'noChildContext': unwrappedValue['noChildContext'],
|
|
'includeDestroyed': unwrappedValue['includeDestroyed'],
|
|
'afterAdd': unwrappedValue['afterAdd'],
|
|
'beforeRemove': unwrappedValue['beforeRemove'],
|
|
'afterRender': unwrappedValue['afterRender'],
|
|
'beforeMove': unwrappedValue['beforeMove'],
|
|
'afterMove': unwrappedValue['afterMove'],
|
|
'templateEngine': ko.nativeTemplateEngine.instance
|
|
};
|
|
};
|
|
},
|
|
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
|
|
},
|
|
'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);
|
|
}
|
|
};
|
|
ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
|
|
ko.virtualElements.allowedBindings['foreach'] = true;
|
|
var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
|
|
var hasfocusLastValue = '__ko_hasfocusLastValue';
|
|
ko.bindingHandlers['hasfocus'] = {
|
|
'init': function(element, valueAccessor, allBindings) {
|
|
var handleElementFocusChange = function(isFocused) {
|
|
// Where possible, ignore which event was raised and determine focus state using activeElement,
|
|
// as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
|
|
// However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
|
|
// prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
|
|
// from calling 'blur()' on the element when it loses focus.
|
|
// Discussion at https://github.com/SteveSanderson/knockout/pull/352
|
|
element[hasfocusUpdatingProperty] = true;
|
|
var ownerDoc = element.ownerDocument;
|
|
if ("activeElement" in ownerDoc) {
|
|
var active;
|
|
try {
|
|
active = ownerDoc.activeElement;
|
|
} catch(e) {
|
|
// IE9 throws if you access activeElement during page load (see issue #703)
|
|
active = ownerDoc.body;
|
|
}
|
|
isFocused = (active === element);
|
|
}
|
|
var modelValue = valueAccessor();
|
|
ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true);
|
|
|
|
//cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function
|
|
element[hasfocusLastValue] = isFocused;
|
|
element[hasfocusUpdatingProperty] = false;
|
|
};
|
|
var handleElementFocusIn = handleElementFocusChange.bind(null, true);
|
|
var handleElementFocusOut = handleElementFocusChange.bind(null, false);
|
|
|
|
ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
|
|
ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
|
|
ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
|
|
ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
|
|
|
|
// Assume element is not focused (prevents "blur" being called initially)
|
|
element[hasfocusLastValue] = false;
|
|
},
|
|
'update': function(element, valueAccessor) {
|
|
var value = !!ko.utils.unwrapObservable(valueAccessor());
|
|
|
|
if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {
|
|
value ? element.focus() : element.blur();
|
|
|
|
// In IE, the blur method doesn't always cause the element to lose focus (for example, if the window is not in focus).
|
|
// Setting focus to the body element does seem to be reliable in IE, but should only be used if we know that the current
|
|
// element was focused already.
|
|
if (!value && element[hasfocusLastValue]) {
|
|
element.ownerDocument.body.focus();
|
|
}
|
|
|
|
// For IE, which doesn't reliably fire "focus" or "blur" events synchronously
|
|
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]);
|
|
}
|
|
}
|
|
};
|
|
ko.expressionRewriting.twoWayBindings['hasfocus'] = true;
|
|
|
|
ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias
|
|
ko.expressionRewriting.twoWayBindings['hasFocus'] = 'hasfocus';
|
|
ko.bindingHandlers['html'] = {
|
|
'init': function() {
|
|
// Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
|
|
return { 'controlsDescendantBindings': true };
|
|
},
|
|
'update': function (element, valueAccessor) {
|
|
// setHtml will unwrap the value if needed
|
|
ko.utils.setHtml(element, valueAccessor());
|
|
}
|
|
};
|
|
(function () {
|
|
|
|
// Makes a binding like with or if
|
|
function makeWithIfBinding(bindingKey, isWith, isNot) {
|
|
ko.bindingHandlers[bindingKey] = {
|
|
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
var didDisplayOnLastUpdate, savedNodes, contextOptions = {}, completeOnRender, needAsyncContext, renderOnEveryChange;
|
|
|
|
if (isWith) {
|
|
var as = allBindings.get('as'), noChildContext = allBindings.get('noChildContext');
|
|
renderOnEveryChange = !(as && noChildContext);
|
|
contextOptions = { 'as': as, 'noChildContext': noChildContext, 'exportDependencies': renderOnEveryChange };
|
|
}
|
|
|
|
completeOnRender = allBindings.get("completeOn") == "render";
|
|
needAsyncContext = completeOnRender || allBindings['has'](ko.bindingEvent.descendantsComplete);
|
|
|
|
ko.computed(function() {
|
|
var value = ko.utils.unwrapObservable(valueAccessor()),
|
|
shouldDisplay = !isNot !== !value, // equivalent to isNot ? !value : !!value,
|
|
isInitial = !savedNodes,
|
|
childContext;
|
|
|
|
if (!renderOnEveryChange && shouldDisplay === didDisplayOnLastUpdate) {
|
|
return;
|
|
}
|
|
|
|
if (needAsyncContext) {
|
|
bindingContext = ko.bindingEvent.startPossiblyAsyncContentBinding(element, bindingContext);
|
|
}
|
|
|
|
if (shouldDisplay) {
|
|
if (!isWith || renderOnEveryChange) {
|
|
contextOptions['dataDependency'] = ko.computedContext.computed();
|
|
}
|
|
|
|
if (isWith) {
|
|
childContext = bindingContext['createChildContext'](typeof value == "function" ? value : valueAccessor, contextOptions);
|
|
} else if (ko.computedContext.getDependenciesCount()) {
|
|
childContext = bindingContext['extend'](null, contextOptions);
|
|
} else {
|
|
childContext = bindingContext;
|
|
}
|
|
}
|
|
|
|
// Save a copy of the inner nodes on the initial update, but only if we have dependencies.
|
|
if (isInitial && ko.computedContext.getDependenciesCount()) {
|
|
savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
|
|
}
|
|
|
|
if (shouldDisplay) {
|
|
if (!isInitial) {
|
|
ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes));
|
|
}
|
|
|
|
ko.applyBindingsToDescendants(childContext, element);
|
|
} else {
|
|
ko.virtualElements.emptyNode(element);
|
|
|
|
if (!completeOnRender) {
|
|
ko.bindingEvent.notify(element, ko.bindingEvent.childrenComplete);
|
|
}
|
|
}
|
|
|
|
didDisplayOnLastUpdate = shouldDisplay;
|
|
|
|
}, null, { disposeWhenNodeIsRemoved: element });
|
|
|
|
return { 'controlsDescendantBindings': true };
|
|
}
|
|
};
|
|
ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
|
|
ko.virtualElements.allowedBindings[bindingKey] = true;
|
|
}
|
|
|
|
// Construct the actual binding handlers
|
|
makeWithIfBinding('if');
|
|
makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
|
|
makeWithIfBinding('with', true /* isWith */);
|
|
|
|
})();ko.bindingHandlers['let'] = {
|
|
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
// Make a modified binding context, with extra properties, and apply it to descendant elements
|
|
var innerContext = bindingContext['extend'](valueAccessor);
|
|
ko.applyBindingsToDescendants(innerContext, element);
|
|
|
|
return { 'controlsDescendantBindings': true };
|
|
}
|
|
};
|
|
ko.virtualElements.allowedBindings['let'] = true;
|
|
var captionPlaceholder = {};
|
|
ko.bindingHandlers['options'] = {
|
|
'init': function(element) {
|
|
if (ko.utils.tagNameLower(element) !== "select")
|
|
throw new Error("options binding applies only to SELECT elements");
|
|
|
|
// Remove all existing <option>s.
|
|
while (element.length > 0) {
|
|
element.remove(0);
|
|
}
|
|
|
|
// Ensures that the binding processor doesn't try to bind the options
|
|
return { 'controlsDescendantBindings': true };
|
|
},
|
|
'update': function (element, valueAccessor, allBindings) {
|
|
function selectedOptions() {
|
|
return ko.utils.arrayFilter(element.options, function (node) { return node.selected; });
|
|
}
|
|
|
|
var selectWasPreviouslyEmpty = element.length == 0,
|
|
multiple = element.multiple,
|
|
previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null,
|
|
unwrappedArray = ko.utils.unwrapObservable(valueAccessor()),
|
|
valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'),
|
|
includeDestroyed = allBindings.get('optionsIncludeDestroyed'),
|
|
arrayToDomNodeChildrenOptions = {},
|
|
captionValue,
|
|
filteredArray,
|
|
previousSelectedValues = [];
|
|
|
|
if (!valueAllowUnset) {
|
|
if (multiple) {
|
|
previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);
|
|
} else if (element.selectedIndex >= 0) {
|
|
previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex]));
|
|
}
|
|
}
|
|
|
|
if (unwrappedArray) {
|
|
if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
|
|
unwrappedArray = [unwrappedArray];
|
|
|
|
// Filter out any entries marked as destroyed
|
|
filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
|
|
return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
|
|
});
|
|
|
|
// If caption is included, add it to the array
|
|
if (allBindings['has']('optionsCaption')) {
|
|
captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption'));
|
|
// If caption value is null or undefined, don't show a caption
|
|
if (captionValue !== null && captionValue !== undefined) {
|
|
filteredArray.unshift(captionPlaceholder);
|
|
}
|
|
}
|
|
} else {
|
|
// If a falsy value is provided (e.g. null), we'll simply empty the select element
|
|
}
|
|
|
|
function applyToObject(object, predicate, defaultValue) {
|
|
var predicateType = typeof predicate;
|
|
if (predicateType == "function") // Given a function; run it against the data value
|
|
return predicate(object);
|
|
else if (predicateType == "string") // Given a string; treat it as a property name on the data value
|
|
return object[predicate];
|
|
else // Given no optionsText arg; use the data value itself
|
|
return defaultValue;
|
|
}
|
|
|
|
// The following functions can run at two different times:
|
|
// The first is when the whole array is being updated directly from this binding handler.
|
|
// The second is when an observable value for a specific array entry is updated.
|
|
// oldOptions will be empty in the first case, but will be filled with the previously generated option in the second.
|
|
var itemUpdate = false;
|
|
function optionForArrayItem(arrayEntry, index, oldOptions) {
|
|
if (oldOptions.length) {
|
|
previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ ko.selectExtensions.readValue(oldOptions[0]) ] : [];
|
|
itemUpdate = true;
|
|
}
|
|
var option = element.ownerDocument.createElement("option");
|
|
if (arrayEntry === captionPlaceholder) {
|
|
ko.utils.setTextContent(option, allBindings.get('optionsCaption'));
|
|
ko.selectExtensions.writeValue(option, undefined);
|
|
} else {
|
|
// Apply a value to the option element
|
|
var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry);
|
|
ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
|
|
|
|
// Apply some text to the option element
|
|
var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue);
|
|
ko.utils.setTextContent(option, optionText);
|
|
}
|
|
return [option];
|
|
}
|
|
|
|
// By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection
|
|
// problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208
|
|
arrayToDomNodeChildrenOptions['beforeRemove'] =
|
|
function (option) {
|
|
element.removeChild(option);
|
|
};
|
|
|
|
function setSelectionCallback(arrayEntry, newOptions) {
|
|
if (itemUpdate && valueAllowUnset) {
|
|
// The model value is authoritative, so make sure its value is the one selected
|
|
ko.bindingEvent.notify(element, ko.bindingEvent.childrenComplete);
|
|
} else if (previousSelectedValues.length) {
|
|
// IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
|
|
// That's why we first added them without selection. Now it's time to set the selection.
|
|
var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;
|
|
ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);
|
|
|
|
// If this option was changed from being selected during a single-item update, notify the change
|
|
if (itemUpdate && !isSelected) {
|
|
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
|
|
}
|
|
}
|
|
}
|
|
|
|
var callback = setSelectionCallback;
|
|
if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == "function") {
|
|
callback = function(arrayEntry, newOptions) {
|
|
setSelectionCallback(arrayEntry, newOptions);
|
|
ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);
|
|
}
|
|
}
|
|
|
|
ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback);
|
|
|
|
if (!valueAllowUnset) {
|
|
// Determine if the selection has changed as a result of updating the options list
|
|
var selectionChanged;
|
|
if (multiple) {
|
|
// For a multiple-select box, compare the new selection count to the previous one
|
|
// But if nothing was selected before, the selection can't have changed
|
|
selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length;
|
|
} else {
|
|
// For a single-select box, compare the current value to the previous value
|
|
// But if nothing was selected before or nothing is selected now, just look for a change in selection
|
|
selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0)
|
|
? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0])
|
|
: (previousSelectedValues.length || element.selectedIndex >= 0);
|
|
}
|
|
|
|
// Ensure consistency between model value and selected option.
|
|
// If the dropdown was changed so that selection is no longer the same,
|
|
// notify the value or selectedOptions binding.
|
|
if (selectionChanged) {
|
|
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
|
|
}
|
|
}
|
|
|
|
if (valueAllowUnset || ko.computedContext.isInitial()) {
|
|
ko.bindingEvent.notify(element, ko.bindingEvent.childrenComplete);
|
|
}
|
|
|
|
// Workaround for IE bug
|
|
ko.utils.ensureSelectElementIsRenderedCorrectly(element);
|
|
|
|
if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)
|
|
element.scrollTop = previousScrollTop;
|
|
}
|
|
};
|
|
ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey();
|
|
ko.bindingHandlers['selectedOptions'] = {
|
|
'init': function (element, valueAccessor, allBindings) {
|
|
function updateFromView() {
|
|
var value = valueAccessor(), valueToWrite = [];
|
|
ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
|
|
if (node.selected)
|
|
valueToWrite.push(ko.selectExtensions.readValue(node));
|
|
});
|
|
ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite);
|
|
}
|
|
|
|
function updateFromModel() {
|
|
var newValue = ko.utils.unwrapObservable(valueAccessor()),
|
|
previousScrollTop = element.scrollTop;
|
|
|
|
if (newValue && typeof newValue.length == "number") {
|
|
ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
|
|
var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
|
|
if (node.selected != isSelected) { // This check prevents flashing of the select element in IE
|
|
ko.utils.setOptionNodeSelectionState(node, isSelected);
|
|
}
|
|
});
|
|
}
|
|
|
|
element.scrollTop = previousScrollTop;
|
|
}
|
|
|
|
if (ko.utils.tagNameLower(element) != "select") {
|
|
throw new Error("selectedOptions binding applies only to SELECT elements");
|
|
}
|
|
|
|
var updateFromModelComputed;
|
|
ko.bindingEvent.subscribe(element, ko.bindingEvent.childrenComplete, function () {
|
|
if (!updateFromModelComputed) {
|
|
ko.utils.registerEventHandler(element, "change", updateFromView);
|
|
updateFromModelComputed = ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
|
|
} else {
|
|
updateFromView();
|
|
}
|
|
}, null, { 'notifyImmediately': true });
|
|
},
|
|
'update': function() {} // Keep for backwards compatibility with code that may have wrapped binding
|
|
};
|
|
ko.expressionRewriting.twoWayBindings['selectedOptions'] = true;
|
|
ko.bindingHandlers['style'] = {
|
|
'update': function (element, valueAccessor) {
|
|
var value = ko.utils.unwrapObservable(valueAccessor() || {});
|
|
ko.utils.objectForEach(value, function(styleName, styleValue) {
|
|
styleValue = ko.utils.unwrapObservable(styleValue);
|
|
|
|
if (styleValue === null || styleValue === undefined || styleValue === false) {
|
|
// Empty string removes the value, whereas null/undefined have no effect
|
|
styleValue = "";
|
|
}
|
|
|
|
if (jQueryInstance) {
|
|
jQueryInstance(element)['css'](styleName, styleValue);
|
|
} else if (/^--/.test(styleName)) {
|
|
// Is styleName a custom CSS property?
|
|
element.style.setProperty(styleName, styleValue);
|
|
} else {
|
|
styleName = styleName.replace(/-(\w)/g, function (all, letter) {
|
|
return letter.toUpperCase();
|
|
});
|
|
|
|
var previousStyle = element.style[styleName];
|
|
element.style[styleName] = styleValue;
|
|
|
|
if (styleValue !== previousStyle && element.style[styleName] == previousStyle && !isNaN(styleValue)) {
|
|
element.style[styleName] = styleValue + "px";
|
|
}
|
|
}
|
|
});
|
|
}
|
|
};
|
|
ko.bindingHandlers['submit'] = {
|
|
'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
if (typeof valueAccessor() != "function")
|
|
throw new Error("The value for a submit binding must be a function");
|
|
ko.utils.registerEventHandler(element, "submit", function (event) {
|
|
var handlerReturnValue;
|
|
var value = valueAccessor();
|
|
try { handlerReturnValue = value.call(bindingContext['$data'], element); }
|
|
finally {
|
|
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
|
|
if (event.preventDefault)
|
|
event.preventDefault();
|
|
else
|
|
event.returnValue = false;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
};
|
|
ko.bindingHandlers['text'] = {
|
|
'init': function() {
|
|
// Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications).
|
|
// It should also make things faster, as we no longer have to consider whether the text node might be bindable.
|
|
return { 'controlsDescendantBindings': true };
|
|
},
|
|
'update': function (element, valueAccessor) {
|
|
ko.utils.setTextContent(element, valueAccessor());
|
|
}
|
|
};
|
|
ko.virtualElements.allowedBindings['text'] = true;
|
|
(function () {
|
|
|
|
if (window && window.navigator) {
|
|
var parseVersion = function (matches) {
|
|
if (matches) {
|
|
return parseFloat(matches[1]);
|
|
}
|
|
};
|
|
|
|
// Detect various browser versions because some old versions don't fully support the 'input' event
|
|
var userAgent = window.navigator.userAgent,
|
|
operaVersion, chromeVersion, safariVersion, firefoxVersion, ieVersion, edgeVersion;
|
|
|
|
(operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()))
|
|
|| (edgeVersion = parseVersion(userAgent.match(/Edge\/([^ ]+)$/)))
|
|
|| (chromeVersion = parseVersion(userAgent.match(/Chrome\/([^ ]+)/)))
|
|
|| (safariVersion = parseVersion(userAgent.match(/Version\/([^ ]+) Safari/)))
|
|
|| (firefoxVersion = parseVersion(userAgent.match(/Firefox\/([^ ]+)/)))
|
|
|| (ieVersion = ko.utils.ieVersion || parseVersion(userAgent.match(/MSIE ([^ ]+)/))) // Detects up to IE 10
|
|
|| (ieVersion = parseVersion(userAgent.match(/rv:([^ )]+)/))); // Detects IE 11
|
|
}
|
|
|
|
// IE 8 and 9 have bugs that prevent the normal events from firing when the value changes.
|
|
// But it does fire the 'selectionchange' event on many of those, presumably because the
|
|
// cursor is moving and that counts as the selection changing. The 'selectionchange' event is
|
|
// fired at the document level only and doesn't directly indicate which element changed. We
|
|
// set up just one event handler for the document and use 'activeElement' to determine which
|
|
// element was changed.
|
|
if (ieVersion >= 8 && ieVersion < 10) {
|
|
var selectionChangeRegisteredName = ko.utils.domData.nextKey(),
|
|
selectionChangeHandlerName = ko.utils.domData.nextKey();
|
|
var selectionChangeHandler = function(event) {
|
|
var target = this.activeElement,
|
|
handler = target && ko.utils.domData.get(target, selectionChangeHandlerName);
|
|
if (handler) {
|
|
handler(event);
|
|
}
|
|
};
|
|
var registerForSelectionChangeEvent = function (element, handler) {
|
|
var ownerDoc = element.ownerDocument;
|
|
if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) {
|
|
ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true);
|
|
ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler);
|
|
}
|
|
ko.utils.domData.set(element, selectionChangeHandlerName, handler);
|
|
};
|
|
}
|
|
|
|
ko.bindingHandlers['textInput'] = {
|
|
'init': function (element, valueAccessor, allBindings) {
|
|
|
|
var previousElementValue = element.value,
|
|
timeoutHandle,
|
|
elementValueBeforeEvent;
|
|
|
|
var updateModel = function (event) {
|
|
clearTimeout(timeoutHandle);
|
|
elementValueBeforeEvent = timeoutHandle = undefined;
|
|
|
|
var elementValue = element.value;
|
|
if (previousElementValue !== elementValue) {
|
|
// Provide a way for tests to know exactly which event was processed
|
|
if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type;
|
|
previousElementValue = elementValue;
|
|
ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue);
|
|
}
|
|
};
|
|
|
|
var deferUpdateModel = function (event) {
|
|
if (!timeoutHandle) {
|
|
// The elementValueBeforeEvent variable is set *only* during the brief gap between an
|
|
// event firing and the updateModel function running. This allows us to ignore model
|
|
// updates that are from the previous state of the element, usually due to techniques
|
|
// such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost.
|
|
elementValueBeforeEvent = element.value;
|
|
var handler = DEBUG ? updateModel.bind(element, {type: event.type}) : updateModel;
|
|
timeoutHandle = ko.utils.setTimeout(handler, 4);
|
|
}
|
|
};
|
|
|
|
// IE9 will mess up the DOM if you handle events synchronously which results in DOM changes (such as other bindings);
|
|
// so we'll make sure all updates are asynchronous
|
|
var ieUpdateModel = ko.utils.ieVersion == 9 ? deferUpdateModel : updateModel,
|
|
ourUpdate = false;
|
|
|
|
var updateView = function () {
|
|
var modelValue = ko.utils.unwrapObservable(valueAccessor());
|
|
|
|
if (modelValue === null || modelValue === undefined) {
|
|
modelValue = '';
|
|
}
|
|
|
|
if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) {
|
|
ko.utils.setTimeout(updateView, 4);
|
|
return;
|
|
}
|
|
|
|
// Update the element only if the element and model are different. On some browsers, updating the value
|
|
// will move the cursor to the end of the input, which would be bad while the user is typing.
|
|
if (element.value !== modelValue) {
|
|
ourUpdate = true; // Make sure we ignore events (propertychange) that result from updating the value
|
|
element.value = modelValue;
|
|
ourUpdate = false;
|
|
previousElementValue = element.value; // In case the browser changes the value (see #2281)
|
|
}
|
|
};
|
|
|
|
var onEvent = function (event, handler) {
|
|
ko.utils.registerEventHandler(element, event, handler);
|
|
};
|
|
|
|
if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) {
|
|
// Provide a way for tests to specify exactly which events are bound
|
|
ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function(eventName) {
|
|
if (eventName.slice(0,5) == 'after') {
|
|
onEvent(eventName.slice(5), deferUpdateModel);
|
|
} else {
|
|
onEvent(eventName, updateModel);
|
|
}
|
|
});
|
|
} else {
|
|
if (ieVersion) {
|
|
// All versions (including 11) of Internet Explorer have a bug that they don't generate an input or propertychange event when ESC is pressed
|
|
onEvent('keypress', updateModel);
|
|
}
|
|
if (ieVersion < 11) {
|
|
// Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever
|
|
// any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code,
|
|
// but that's an acceptable compromise for this binding. IE 9 and 10 support 'input', but since they don't always
|
|
// fire it when using autocomplete, we'll use 'propertychange' for them also.
|
|
onEvent('propertychange', function(event) {
|
|
if (!ourUpdate && event.propertyName === 'value') {
|
|
ieUpdateModel(event);
|
|
}
|
|
});
|
|
}
|
|
if (ieVersion == 8) {
|
|
// IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from
|
|
// JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following
|
|
// events too.
|
|
onEvent('keyup', updateModel); // A single keystoke
|
|
onEvent('keydown', updateModel); // The first character when a key is held down
|
|
}
|
|
if (registerForSelectionChangeEvent) {
|
|
// Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using
|
|
// the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text
|
|
// out of the field, and cutting or deleting text using the context menu. 'selectionchange'
|
|
// can detect all of those except dragging text out of the field, for which we use 'dragend'.
|
|
// These are also needed in IE8 because of the bug described above.
|
|
registerForSelectionChangeEvent(element, ieUpdateModel); // 'selectionchange' covers cut, paste, drop, delete, etc.
|
|
onEvent('dragend', deferUpdateModel);
|
|
}
|
|
|
|
if (!ieVersion || ieVersion >= 9) {
|
|
// All other supported browsers support the 'input' event, which fires whenever the content of the element is changed
|
|
// through the user interface.
|
|
onEvent('input', ieUpdateModel);
|
|
}
|
|
|
|
if (safariVersion < 5 && ko.utils.tagNameLower(element) === "textarea") {
|
|
// Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput'
|
|
// but only when typing). So we'll just catch as much as we can with keydown, cut, and paste.
|
|
onEvent('keydown', deferUpdateModel);
|
|
onEvent('paste', deferUpdateModel);
|
|
onEvent('cut', deferUpdateModel);
|
|
} else if (operaVersion < 11) {
|
|
// Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations.
|
|
// We can try to catch some of those using 'keydown'.
|
|
onEvent('keydown', deferUpdateModel);
|
|
} else if (firefoxVersion < 4.0) {
|
|
// Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete
|
|
onEvent('DOMAutoComplete', updateModel);
|
|
|
|
// Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input.
|
|
onEvent('dragdrop', updateModel); // <3.5
|
|
onEvent('drop', updateModel); // 3.5
|
|
} else if (edgeVersion && element.type === "number") {
|
|
// Microsoft Edge doesn't fire 'input' or 'change' events for number inputs when
|
|
// the value is changed via the up / down arrow keys
|
|
onEvent('keydown', deferUpdateModel);
|
|
}
|
|
}
|
|
|
|
// Bind to the change event so that we can catch programmatic updates of the value that fire this event.
|
|
onEvent('change', updateModel);
|
|
|
|
// To deal with browsers that don't notify any kind of event for some changes (IE, Safari, etc.)
|
|
onEvent('blur', updateModel);
|
|
|
|
ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
|
|
}
|
|
};
|
|
ko.expressionRewriting.twoWayBindings['textInput'] = true;
|
|
|
|
// textinput is an alias for textInput
|
|
ko.bindingHandlers['textinput'] = {
|
|
// preprocess is the only way to set up a full alias
|
|
'preprocess': function (value, name, addBinding) {
|
|
addBinding('textInput', value);
|
|
}
|
|
};
|
|
|
|
})();ko.bindingHandlers['uniqueName'] = {
|
|
'init': function (element, valueAccessor) {
|
|
if (valueAccessor()) {
|
|
var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
|
|
ko.utils.setElementName(element, name);
|
|
}
|
|
}
|
|
};
|
|
ko.bindingHandlers['uniqueName'].currentIndex = 0;
|
|
ko.bindingHandlers['using'] = {
|
|
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
var options;
|
|
|
|
if (allBindings['has']('as')) {
|
|
options = { 'as': allBindings.get('as'), 'noChildContext': allBindings.get('noChildContext') };
|
|
}
|
|
|
|
var innerContext = bindingContext['createChildContext'](valueAccessor, options);
|
|
ko.applyBindingsToDescendants(innerContext, element);
|
|
|
|
return { 'controlsDescendantBindings': true };
|
|
}
|
|
};
|
|
ko.virtualElements.allowedBindings['using'] = true;
|
|
ko.bindingHandlers['value'] = {
|
|
'init': function (element, valueAccessor, allBindings) {
|
|
var tagName = ko.utils.tagNameLower(element),
|
|
isInputElement = tagName == "input";
|
|
|
|
// If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit
|
|
if (isInputElement && (element.type == "checkbox" || element.type == "radio")) {
|
|
ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor });
|
|
return;
|
|
}
|
|
|
|
var eventsToCatch = [];
|
|
var requestedEventsToCatch = allBindings.get("valueUpdate");
|
|
var propertyChangedFired = false;
|
|
var elementValueBeforeEvent = null;
|
|
|
|
if (requestedEventsToCatch) {
|
|
// Allow both individual event names, and arrays of event names
|
|
if (typeof requestedEventsToCatch == "string") {
|
|
eventsToCatch = [requestedEventsToCatch];
|
|
} else {
|
|
eventsToCatch = ko.utils.arrayGetDistinctValues(requestedEventsToCatch);
|
|
}
|
|
ko.utils.arrayRemoveItem(eventsToCatch, "change"); // We'll subscribe to "change" events later
|
|
}
|
|
|
|
var valueUpdateHandler = function() {
|
|
elementValueBeforeEvent = null;
|
|
propertyChangedFired = false;
|
|
var modelValue = valueAccessor();
|
|
var elementValue = ko.selectExtensions.readValue(element);
|
|
ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue);
|
|
}
|
|
|
|
// Workaround for https://github.com/SteveSanderson/knockout/issues/122
|
|
// IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
|
|
var ieAutoCompleteHackNeeded = ko.utils.ieVersion && isInputElement && element.type == "text"
|
|
&& element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
|
|
if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
|
|
ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
|
|
ko.utils.registerEventHandler(element, "focus", function () { propertyChangedFired = false });
|
|
ko.utils.registerEventHandler(element, "blur", function() {
|
|
if (propertyChangedFired) {
|
|
valueUpdateHandler();
|
|
}
|
|
});
|
|
}
|
|
|
|
ko.utils.arrayForEach(eventsToCatch, function(eventName) {
|
|
// The syntax "after<eventname>" means "run the handler asynchronously after the event"
|
|
// This is useful, for example, to catch "keydown" events after the browser has updated the control
|
|
// (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
|
|
var handler = valueUpdateHandler;
|
|
if (ko.utils.stringStartsWith(eventName, "after")) {
|
|
handler = function() {
|
|
// The elementValueBeforeEvent variable is non-null *only* during the brief gap between
|
|
// a keyX event firing and the valueUpdateHandler running, which is scheduled to happen
|
|
// at the earliest asynchronous opportunity. We store this temporary information so that
|
|
// if, between keyX and valueUpdateHandler, the underlying model value changes separately,
|
|
// we can overwrite that model value change with the value the user just typed. Otherwise,
|
|
// techniques like rateLimit can trigger model changes at critical moments that will
|
|
// override the user's inputs, causing keystrokes to be lost.
|
|
elementValueBeforeEvent = ko.selectExtensions.readValue(element);
|
|
ko.utils.setTimeout(valueUpdateHandler, 0);
|
|
};
|
|
eventName = eventName.substring("after".length);
|
|
}
|
|
ko.utils.registerEventHandler(element, eventName, handler);
|
|
});
|
|
|
|
var updateFromModel;
|
|
|
|
if (isInputElement && element.type == "file") {
|
|
// For file input elements, can only write the empty string
|
|
updateFromModel = function () {
|
|
var newValue = ko.utils.unwrapObservable(valueAccessor());
|
|
if (newValue === null || newValue === undefined || newValue === "") {
|
|
element.value = "";
|
|
} else {
|
|
ko.dependencyDetection.ignore(valueUpdateHandler); // reset the model to match the element
|
|
}
|
|
}
|
|
} else {
|
|
updateFromModel = function () {
|
|
var newValue = ko.utils.unwrapObservable(valueAccessor());
|
|
var elementValue = ko.selectExtensions.readValue(element);
|
|
|
|
if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) {
|
|
ko.utils.setTimeout(updateFromModel, 0);
|
|
return;
|
|
}
|
|
|
|
var valueHasChanged = newValue !== elementValue;
|
|
|
|
if (valueHasChanged || elementValue === undefined) {
|
|
if (tagName === "select") {
|
|
var allowUnset = allBindings.get('valueAllowUnset');
|
|
ko.selectExtensions.writeValue(element, newValue, allowUnset);
|
|
if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) {
|
|
// If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
|
|
// because you're not allowed to have a model value that disagrees with a visible UI selection.
|
|
ko.dependencyDetection.ignore(valueUpdateHandler);
|
|
}
|
|
} else {
|
|
ko.selectExtensions.writeValue(element, newValue);
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
if (tagName === "select") {
|
|
var updateFromModelComputed;
|
|
ko.bindingEvent.subscribe(element, ko.bindingEvent.childrenComplete, function () {
|
|
if (!updateFromModelComputed) {
|
|
ko.utils.registerEventHandler(element, "change", valueUpdateHandler);
|
|
updateFromModelComputed = ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
|
|
} else if (allBindings.get('valueAllowUnset')) {
|
|
updateFromModel();
|
|
} else {
|
|
valueUpdateHandler();
|
|
}
|
|
}, null, { 'notifyImmediately': true });
|
|
} else {
|
|
ko.utils.registerEventHandler(element, "change", valueUpdateHandler);
|
|
ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
|
|
}
|
|
},
|
|
'update': function() {} // Keep for backwards compatibility with code that may have wrapped value binding
|
|
};
|
|
ko.expressionRewriting.twoWayBindings['value'] = true;
|
|
ko.bindingHandlers['visible'] = {
|
|
'update': function (element, valueAccessor) {
|
|
var value = ko.utils.unwrapObservable(valueAccessor());
|
|
var isCurrentlyVisible = !(element.style.display == "none");
|
|
if (value && !isCurrentlyVisible)
|
|
element.style.display = "";
|
|
else if ((!value) && isCurrentlyVisible)
|
|
element.style.display = "none";
|
|
}
|
|
};
|
|
|
|
ko.bindingHandlers['hidden'] = {
|
|
'update': function (element, valueAccessor) {
|
|
ko.bindingHandlers['visible']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
|
|
}
|
|
};
|
|
// 'click' is just a shorthand for the usual full-length event:{click:handler}
|
|
makeEventHandlerShortcut('click');
|
|
// If you want to make a custom template engine,
|
|
//
|
|
// [1] Inherit from this class (like ko.nativeTemplateEngine does)
|
|
// [2] Override 'renderTemplateSource', supplying a function with this signature:
|
|
//
|
|
// function (templateSource, bindingContext, options) {
|
|
// // - templateSource.text() is the text of the template you should render
|
|
// // - bindingContext.$data is the data you should pass into the template
|
|
// // - you might also want to make bindingContext.$parent, bindingContext.$parents,
|
|
// // and bindingContext.$root available in the template too
|
|
// // - options gives you access to any other properties set on "data-bind: { template: options }"
|
|
// // - templateDocument is the document object of the template
|
|
// //
|
|
// // Return value: an array of DOM nodes
|
|
// }
|
|
//
|
|
// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
|
|
//
|
|
// function (script) {
|
|
// // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
|
|
// // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
|
|
// }
|
|
//
|
|
// This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
|
|
// If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
|
|
// and then you don't need to override 'createJavaScriptEvaluatorBlock'.
|
|
|
|
ko.templateEngine = function () { };
|
|
|
|
ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
|
|
throw new Error("Override renderTemplateSource");
|
|
};
|
|
|
|
ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
|
|
throw new Error("Override createJavaScriptEvaluatorBlock");
|
|
};
|
|
|
|
ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
|
|
// Named template
|
|
if (typeof template == "string") {
|
|
templateDocument = templateDocument || document;
|
|
var elem = templateDocument.getElementById(template);
|
|
if (!elem)
|
|
throw new Error("Cannot find template with ID " + template);
|
|
return new ko.templateSources.domElement(elem);
|
|
} else if ((template.nodeType == 1) || (template.nodeType == 8)) {
|
|
// Anonymous template
|
|
return new ko.templateSources.anonymousTemplate(template);
|
|
} else
|
|
throw new Error("Unknown template type: " + template);
|
|
};
|
|
|
|
ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
|
|
var templateSource = this['makeTemplateSource'](template, templateDocument);
|
|
return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument);
|
|
};
|
|
|
|
ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
|
|
// Skip rewriting if requested
|
|
if (this['allowTemplateRewriting'] === false)
|
|
return true;
|
|
return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
|
|
};
|
|
|
|
ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
|
|
var templateSource = this['makeTemplateSource'](template, templateDocument);
|
|
var rewritten = rewriterCallback(templateSource['text']());
|
|
templateSource['text'](rewritten);
|
|
templateSource['data']("isRewritten", true);
|
|
};
|
|
|
|
ko.exportSymbol('templateEngine', ko.templateEngine);
|
|
|
|
ko.templateRewriting = (function () {
|
|
var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\d*)(?:\s+(?!data-bind\s*=\s*)[a-z0-9\-]+(?:=(?:\"[^\"]*\"|\'[^\']*\'|[^>]*))?)*\s+)data-bind\s*=\s*(["'])([\s\S]*?)\3/gi;
|
|
var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
|
|
|
|
function validateDataBindValuesForRewriting(keyValueArray) {
|
|
var allValidators = ko.expressionRewriting.bindingRewriteValidators;
|
|
for (var i = 0; i < keyValueArray.length; i++) {
|
|
var key = keyValueArray[i]['key'];
|
|
if (Object.prototype.hasOwnProperty.call(allValidators, key)) {
|
|
var validator = allValidators[key];
|
|
|
|
if (typeof validator === "function") {
|
|
var possibleErrorMessage = validator(keyValueArray[i]['value']);
|
|
if (possibleErrorMessage)
|
|
throw new Error(possibleErrorMessage);
|
|
} else if (!validator) {
|
|
throw new Error("This template engine does not support the '" + key + "' binding within its templates");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) {
|
|
var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
|
|
validateDataBindValuesForRewriting(dataBindKeyValueArray);
|
|
var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, {'valueAccessors':true});
|
|
|
|
// For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
|
|
// anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
|
|
// extra indirection.
|
|
var applyBindingsToNextSiblingScript =
|
|
"ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()},'" + nodeName.toLowerCase() + "')";
|
|
return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
|
|
}
|
|
|
|
return {
|
|
ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
|
|
if (!templateEngine['isTemplateRewritten'](template, templateDocument))
|
|
templateEngine['rewriteTemplate'](template, function (htmlString) {
|
|
return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
|
|
}, templateDocument);
|
|
},
|
|
|
|
memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
|
|
return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
|
|
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine);
|
|
}).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
|
|
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", /* nodeName: */ "#comment", templateEngine);
|
|
});
|
|
},
|
|
|
|
applyMemoizedBindingsToNextSibling: function (bindings, nodeName) {
|
|
return ko.memoization.memoize(function (domNode, bindingContext) {
|
|
var nodeToBind = domNode.nextSibling;
|
|
if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) {
|
|
ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
})();
|
|
|
|
|
|
// Exported only because it has to be referenced by string lookup from within rewritten template
|
|
ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
|
|
(function() {
|
|
// A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
|
|
// logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
|
|
//
|
|
// Two are provided by default:
|
|
// 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element
|
|
// 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
|
|
// without reading/writing the actual element text content, since it will be overwritten
|
|
// with the rendered template output.
|
|
// You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
|
|
// Template sources need to have the following functions:
|
|
// text() - returns the template text from your storage location
|
|
// text(value) - writes the supplied template text to your storage location
|
|
// data(key) - reads values stored using data(key, value) - see below
|
|
// data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten".
|
|
//
|
|
// Optionally, template sources can also have the following functions:
|
|
// nodes() - returns a DOM element containing the nodes of this template, where available
|
|
// nodes(value) - writes the given DOM element to your storage location
|
|
// If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
|
|
// for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
|
|
//
|
|
// Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
|
|
// using and overriding "makeTemplateSource" to return an instance of your custom template source.
|
|
|
|
ko.templateSources = {};
|
|
|
|
// ---- ko.templateSources.domElement -----
|
|
|
|
// template types
|
|
var templateScript = 1,
|
|
templateTextArea = 2,
|
|
templateTemplate = 3,
|
|
templateElement = 4;
|
|
|
|
ko.templateSources.domElement = function(element) {
|
|
this.domElement = element;
|
|
|
|
if (element) {
|
|
var tagNameLower = ko.utils.tagNameLower(element);
|
|
this.templateType =
|
|
tagNameLower === "script" ? templateScript :
|
|
tagNameLower === "textarea" ? templateTextArea :
|
|
// For browsers with proper <template> element support, where the .content property gives a document fragment
|
|
tagNameLower == "template" && element.content && element.content.nodeType === 11 ? templateTemplate :
|
|
templateElement;
|
|
}
|
|
}
|
|
|
|
ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
|
|
var elemContentsProperty = this.templateType === templateScript ? "text"
|
|
: this.templateType === templateTextArea ? "value"
|
|
: "innerHTML";
|
|
|
|
if (arguments.length == 0) {
|
|
return this.domElement[elemContentsProperty];
|
|
} else {
|
|
var valueToWrite = arguments[0];
|
|
if (elemContentsProperty === "innerHTML")
|
|
ko.utils.setHtml(this.domElement, valueToWrite);
|
|
else
|
|
this.domElement[elemContentsProperty] = valueToWrite;
|
|
}
|
|
};
|
|
|
|
var dataDomDataPrefix = ko.utils.domData.nextKey() + "_";
|
|
ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
|
|
if (arguments.length === 1) {
|
|
return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key);
|
|
} else {
|
|
ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]);
|
|
}
|
|
};
|
|
|
|
var templatesDomDataKey = ko.utils.domData.nextKey();
|
|
function getTemplateDomData(element) {
|
|
return ko.utils.domData.get(element, templatesDomDataKey) || {};
|
|
}
|
|
function setTemplateDomData(element, data) {
|
|
ko.utils.domData.set(element, templatesDomDataKey, data);
|
|
}
|
|
|
|
ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
|
|
var element = this.domElement;
|
|
if (arguments.length == 0) {
|
|
var templateData = getTemplateDomData(element),
|
|
nodes = templateData.containerData || (
|
|
this.templateType === templateTemplate ? element.content :
|
|
this.templateType === templateElement ? element :
|
|
undefined);
|
|
if (!nodes || templateData.alwaysCheckText) {
|
|
// If the template is associated with an element that stores the template as text,
|
|
// parse and cache the nodes whenever there's new text content available. This allows
|
|
// the user to update the template content by updating the text of template node.
|
|
var text = this['text']();
|
|
if (text && text !== templateData.textData) {
|
|
nodes = ko.utils.parseHtmlForTemplateNodes(text, element.ownerDocument);
|
|
setTemplateDomData(element, {containerData: nodes, textData: text, alwaysCheckText: true});
|
|
}
|
|
}
|
|
return nodes;
|
|
} else {
|
|
var valueToWrite = arguments[0];
|
|
if (this.templateType !== undefined) {
|
|
this['text'](""); // clear the text from the node
|
|
}
|
|
setTemplateDomData(element, {containerData: valueToWrite});
|
|
}
|
|
};
|
|
|
|
// ---- ko.templateSources.anonymousTemplate -----
|
|
// Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
|
|
// For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
|
|
// Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
|
|
|
|
ko.templateSources.anonymousTemplate = function(element) {
|
|
this.domElement = element;
|
|
}
|
|
ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
|
|
ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;
|
|
ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
|
|
if (arguments.length == 0) {
|
|
var templateData = getTemplateDomData(this.domElement);
|
|
if (templateData.textData === undefined && templateData.containerData)
|
|
templateData.textData = templateData.containerData.innerHTML;
|
|
return templateData.textData;
|
|
} else {
|
|
var valueToWrite = arguments[0];
|
|
setTemplateDomData(this.domElement, {textData: valueToWrite});
|
|
}
|
|
};
|
|
|
|
ko.exportSymbol('templateSources', ko.templateSources);
|
|
ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
|
|
ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
|
|
})();
|
|
(function () {
|
|
var _templateEngine;
|
|
ko.setTemplateEngine = function (templateEngine) {
|
|
if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
|
|
throw new Error("templateEngine must inherit from ko.templateEngine");
|
|
_templateEngine = templateEngine;
|
|
}
|
|
|
|
function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) {
|
|
var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
|
|
while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
|
|
nextInQueue = ko.virtualElements.nextSibling(node);
|
|
action(node, nextInQueue);
|
|
}
|
|
}
|
|
|
|
function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
|
|
// To be used on any nodes that have been rendered by a template and have been inserted into some parent element
|
|
// Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
|
|
// the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
|
|
// (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
|
|
// (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
|
|
|
|
if (continuousNodeArray.length) {
|
|
var firstNode = continuousNodeArray[0],
|
|
lastNode = continuousNodeArray[continuousNodeArray.length - 1],
|
|
parentNode = firstNode.parentNode,
|
|
provider = ko.bindingProvider['instance'],
|
|
preprocessNode = provider['preprocessNode'];
|
|
|
|
if (preprocessNode) {
|
|
invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node, nextNodeInRange) {
|
|
var nodePreviousSibling = node.previousSibling;
|
|
var newNodes = preprocessNode.call(provider, node);
|
|
if (newNodes) {
|
|
if (node === firstNode)
|
|
firstNode = newNodes[0] || nextNodeInRange;
|
|
if (node === lastNode)
|
|
lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling;
|
|
}
|
|
});
|
|
|
|
// Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match.
|
|
// We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real
|
|
// first node needs to be in the array).
|
|
continuousNodeArray.length = 0;
|
|
if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do
|
|
return;
|
|
}
|
|
if (firstNode === lastNode) {
|
|
continuousNodeArray.push(firstNode);
|
|
} else {
|
|
continuousNodeArray.push(firstNode, lastNode);
|
|
ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
|
|
}
|
|
}
|
|
|
|
// Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
|
|
// whereas a regular applyBindings won't introduce new memoized nodes
|
|
invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
|
|
if (node.nodeType === 1 || node.nodeType === 8)
|
|
ko.applyBindings(bindingContext, node);
|
|
});
|
|
invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
|
|
if (node.nodeType === 1 || node.nodeType === 8)
|
|
ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
|
|
});
|
|
|
|
// Make sure any changes done by applyBindings or unmemoize are reflected in the array
|
|
ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
|
|
}
|
|
}
|
|
|
|
function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
|
|
return nodeOrNodeArray.nodeType ? nodeOrNodeArray
|
|
: nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
|
|
: null;
|
|
}
|
|
|
|
function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
|
|
options = options || {};
|
|
var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
|
|
var templateDocument = (firstTargetNode || template || {}).ownerDocument;
|
|
var templateEngineToUse = (options['templateEngine'] || _templateEngine);
|
|
ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
|
|
var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
|
|
|
|
// Loosely check result is an array of DOM nodes
|
|
if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
|
|
throw new Error("Template engine must return an array of DOM nodes");
|
|
|
|
var haveAddedNodesToParent = false;
|
|
switch (renderMode) {
|
|
case "replaceChildren":
|
|
ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
|
|
haveAddedNodesToParent = true;
|
|
break;
|
|
case "replaceNode":
|
|
ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
|
|
haveAddedNodesToParent = true;
|
|
break;
|
|
case "ignoreTargetNode": break;
|
|
default:
|
|
throw new Error("Unknown renderMode: " + renderMode);
|
|
}
|
|
|
|
if (haveAddedNodesToParent) {
|
|
activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
|
|
if (options['afterRender']) {
|
|
ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext[options['as'] || '$data']]);
|
|
}
|
|
if (renderMode == "replaceChildren") {
|
|
ko.bindingEvent.notify(targetNodeOrNodeArray, ko.bindingEvent.childrenComplete);
|
|
}
|
|
}
|
|
|
|
return renderedNodesArray;
|
|
}
|
|
|
|
function resolveTemplateName(template, data, context) {
|
|
// The template can be specified as:
|
|
if (ko.isObservable(template)) {
|
|
// 1. An observable, with string value
|
|
return template();
|
|
} else if (typeof template === 'function') {
|
|
// 2. A function of (data, context) returning a string
|
|
return template(data, context);
|
|
} else {
|
|
// 3. A string
|
|
return template;
|
|
}
|
|
}
|
|
|
|
ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
|
|
options = options || {};
|
|
if ((options['templateEngine'] || _templateEngine) == undefined)
|
|
throw new Error("Set a template engine before calling renderTemplate");
|
|
renderMode = renderMode || "replaceChildren";
|
|
|
|
if (targetNodeOrNodeArray) {
|
|
var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
|
|
|
|
var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
|
|
var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
|
|
|
|
return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
|
|
function () {
|
|
// Ensure we've got a proper binding context to work with
|
|
var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
|
|
? dataOrBindingContext
|
|
: new ko.bindingContext(dataOrBindingContext, null, null, null, { "exportDependencies": true });
|
|
|
|
var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext),
|
|
renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
|
|
|
|
if (renderMode == "replaceNode") {
|
|
targetNodeOrNodeArray = renderedNodesArray;
|
|
firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
|
|
}
|
|
},
|
|
null,
|
|
{ disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
|
|
);
|
|
} else {
|
|
// We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
|
|
return ko.memoization.memoize(function (domNode) {
|
|
ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
|
|
});
|
|
}
|
|
};
|
|
|
|
ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
|
|
// Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
|
|
// activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
|
|
var arrayItemContext, asName = options['as'];
|
|
|
|
// This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
|
|
var executeTemplateForArrayItem = function (arrayValue, index) {
|
|
// Support selecting template as a function of the data being rendered
|
|
arrayItemContext = parentBindingContext['createChildContext'](arrayValue, {
|
|
'as': asName,
|
|
'noChildContext': options['noChildContext'],
|
|
'extend': function(context) {
|
|
context['$index'] = index;
|
|
if (asName) {
|
|
context[asName + "Index"] = index;
|
|
}
|
|
}
|
|
});
|
|
|
|
var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);
|
|
return executeTemplate(targetNode, "ignoreTargetNode", templateName, arrayItemContext, options);
|
|
};
|
|
|
|
// This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
|
|
var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
|
|
activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
|
|
if (options['afterRender'])
|
|
options['afterRender'](addedNodesArray, arrayValue);
|
|
|
|
// release the "cache" variable, so that it can be collected by
|
|
// the GC when its value isn't used from within the bindings anymore.
|
|
arrayItemContext = null;
|
|
};
|
|
|
|
var setDomNodeChildrenFromArrayMapping = function (newArray, changeList) {
|
|
// Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
|
|
// If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
|
|
ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, newArray, executeTemplateForArrayItem, options, activateBindingsCallback, changeList]);
|
|
ko.bindingEvent.notify(targetNode, ko.bindingEvent.childrenComplete);
|
|
};
|
|
|
|
var shouldHideDestroyed = (options['includeDestroyed'] === false) || (ko.options['foreachHidesDestroyed'] && !options['includeDestroyed']);
|
|
|
|
if (!shouldHideDestroyed && !options['beforeRemove'] && ko.isObservableArray(arrayOrObservableArray)) {
|
|
setDomNodeChildrenFromArrayMapping(arrayOrObservableArray.peek());
|
|
|
|
var subscription = arrayOrObservableArray.subscribe(function (changeList) {
|
|
setDomNodeChildrenFromArrayMapping(arrayOrObservableArray(), changeList);
|
|
}, null, "arrayChange");
|
|
subscription.disposeWhenNodeIsRemoved(targetNode);
|
|
|
|
return subscription;
|
|
} else {
|
|
return ko.dependentObservable(function () {
|
|
var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
|
|
if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
|
|
unwrappedArray = [unwrappedArray];
|
|
|
|
if (shouldHideDestroyed) {
|
|
// Filter out any entries marked as destroyed
|
|
unwrappedArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
|
|
return item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
|
|
});
|
|
}
|
|
setDomNodeChildrenFromArrayMapping(unwrappedArray);
|
|
|
|
}, null, { disposeWhenNodeIsRemoved: targetNode });
|
|
}
|
|
};
|
|
|
|
var templateComputedDomDataKey = ko.utils.domData.nextKey();
|
|
function disposeOldComputedAndStoreNewOne(element, newComputed) {
|
|
var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
|
|
if (oldComputed && (typeof(oldComputed.dispose) == 'function'))
|
|
oldComputed.dispose();
|
|
ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && (!newComputed.isActive || newComputed.isActive())) ? newComputed : undefined);
|
|
}
|
|
|
|
var cleanContainerDomDataKey = ko.utils.domData.nextKey();
|
|
ko.bindingHandlers['template'] = {
|
|
'init': function(element, valueAccessor) {
|
|
// Support anonymous templates
|
|
var bindingValue = ko.utils.unwrapObservable(valueAccessor());
|
|
if (typeof bindingValue == "string" || 'name' in bindingValue) {
|
|
// It's a named template - clear the element
|
|
ko.virtualElements.emptyNode(element);
|
|
} else if ('nodes' in bindingValue) {
|
|
// We've been given an array of DOM nodes. Save them as the template source.
|
|
// There is no known use case for the node array being an observable array (if the output
|
|
// varies, put that behavior *into* your template - that's what templates are for), and
|
|
// the implementation would be a mess, so assert that it's not observable.
|
|
var nodes = bindingValue['nodes'] || [];
|
|
if (ko.isObservable(nodes)) {
|
|
throw new Error('The "nodes" option must be a plain, non-observable array.');
|
|
}
|
|
|
|
// If the nodes are already attached to a KO-generated container, we reuse that container without moving the
|
|
// elements to a new one (we check only the first node, as the nodes are always moved together)
|
|
var container = nodes[0] && nodes[0].parentNode;
|
|
if (!container || !ko.utils.domData.get(container, cleanContainerDomDataKey)) {
|
|
container = ko.utils.moveCleanedNodesToContainerElement(nodes);
|
|
ko.utils.domData.set(container, cleanContainerDomDataKey, true);
|
|
}
|
|
|
|
new ko.templateSources.anonymousTemplate(element)['nodes'](container);
|
|
} else {
|
|
// It's an anonymous template - store the element contents, then clear the element
|
|
var templateNodes = ko.virtualElements.childNodes(element);
|
|
if (templateNodes.length > 0) {
|
|
var container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
|
|
new ko.templateSources.anonymousTemplate(element)['nodes'](container);
|
|
} else {
|
|
throw new Error("Anonymous template defined, but no template content was provided");
|
|
}
|
|
}
|
|
return { 'controlsDescendantBindings': true };
|
|
},
|
|
'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
|
|
var value = valueAccessor(),
|
|
options = ko.utils.unwrapObservable(value),
|
|
shouldDisplay = true,
|
|
templateComputed = null,
|
|
template;
|
|
|
|
if (typeof options == "string") {
|
|
template = value;
|
|
options = {};
|
|
} else {
|
|
template = 'name' in options ? options['name'] : element;
|
|
|
|
// Support "if"/"ifnot" conditions
|
|
if ('if' in options)
|
|
shouldDisplay = ko.utils.unwrapObservable(options['if']);
|
|
if (shouldDisplay && 'ifnot' in options)
|
|
shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
|
|
|
|
// Don't show anything if an empty name is given (see #2446)
|
|
if (shouldDisplay && !template) {
|
|
shouldDisplay = false;
|
|
}
|
|
}
|
|
|
|
if ('foreach' in options) {
|
|
// Render once for each data point (treating data set as empty if shouldDisplay==false)
|
|
var dataArray = (shouldDisplay && options['foreach']) || [];
|
|
templateComputed = ko.renderTemplateForEach(template, dataArray, options, element, bindingContext);
|
|
} else if (!shouldDisplay) {
|
|
ko.virtualElements.emptyNode(element);
|
|
} else {
|
|
// Render once for this single data point (or use the viewModel if no data was provided)
|
|
var innerBindingContext = bindingContext;
|
|
if ('data' in options) {
|
|
innerBindingContext = bindingContext['createChildContext'](options['data'], {
|
|
'as': options['as'],
|
|
'noChildContext': options['noChildContext'],
|
|
'exportDependencies': true
|
|
});
|
|
}
|
|
templateComputed = ko.renderTemplate(template, innerBindingContext, options, element);
|
|
}
|
|
|
|
// It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
|
|
disposeOldComputedAndStoreNewOne(element, templateComputed);
|
|
}
|
|
};
|
|
|
|
// Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
|
|
ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
|
|
var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
|
|
|
|
if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
|
|
return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
|
|
|
|
if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
|
|
return null; // Named templates can be rewritten, so return "no error"
|
|
return "This template engine does not support anonymous templates nested within its templates";
|
|
};
|
|
|
|
ko.virtualElements.allowedBindings['template'] = true;
|
|
})();
|
|
|
|
ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
|
|
ko.exportSymbol('renderTemplate', ko.renderTemplate);
|
|
// Go through the items that have been added and deleted and try to find matches between them.
|
|
ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) {
|
|
if (left.length && right.length) {
|
|
var failedCompares, l, r, leftItem, rightItem;
|
|
for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) {
|
|
for (r = 0; rightItem = right[r]; ++r) {
|
|
if (leftItem['value'] === rightItem['value']) {
|
|
leftItem['moved'] = rightItem['index'];
|
|
rightItem['moved'] = leftItem['index'];
|
|
right.splice(r, 1); // This item is marked as moved; so remove it from right list
|
|
failedCompares = r = 0; // Reset failed compares count because we're checking for consecutive failures
|
|
break;
|
|
}
|
|
}
|
|
failedCompares += r;
|
|
}
|
|
}
|
|
};
|
|
|
|
ko.utils.compareArrays = (function () {
|
|
var statusNotInOld = 'added', statusNotInNew = 'deleted';
|
|
|
|
// Simple calculation based on Levenshtein distance.
|
|
function compareArrays(oldArray, newArray, options) {
|
|
// For backward compatibility, if the third arg is actually a bool, interpret
|
|
// it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }.
|
|
options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {});
|
|
oldArray = oldArray || [];
|
|
newArray = newArray || [];
|
|
|
|
if (oldArray.length < newArray.length)
|
|
return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options);
|
|
else
|
|
return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options);
|
|
}
|
|
|
|
function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) {
|
|
var myMin = Math.min,
|
|
myMax = Math.max,
|
|
editDistanceMatrix = [],
|
|
smlIndex, smlIndexMax = smlArray.length,
|
|
bigIndex, bigIndexMax = bigArray.length,
|
|
compareRange = (bigIndexMax - smlIndexMax) || 1,
|
|
maxDistance = smlIndexMax + bigIndexMax + 1,
|
|
thisRow, lastRow,
|
|
bigIndexMaxForRow, bigIndexMinForRow;
|
|
|
|
for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
|
|
lastRow = thisRow;
|
|
editDistanceMatrix.push(thisRow = []);
|
|
bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
|
|
bigIndexMinForRow = myMax(0, smlIndex - 1);
|
|
for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
|
|
if (!bigIndex)
|
|
thisRow[bigIndex] = smlIndex + 1;
|
|
else if (!smlIndex) // Top row - transform empty array into new array via additions
|
|
thisRow[bigIndex] = bigIndex + 1;
|
|
else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
|
|
thisRow[bigIndex] = lastRow[bigIndex - 1]; // copy value (no edit)
|
|
else {
|
|
var northDistance = lastRow[bigIndex] || maxDistance; // not in big (deletion)
|
|
var westDistance = thisRow[bigIndex - 1] || maxDistance; // not in small (addition)
|
|
thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
var editScript = [], meMinusOne, notInSml = [], notInBig = [];
|
|
for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
|
|
meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
|
|
if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {
|
|
notInSml.push(editScript[editScript.length] = { // added
|
|
'status': statusNotInSml,
|
|
'value': bigArray[--bigIndex],
|
|
'index': bigIndex });
|
|
} else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
|
|
notInBig.push(editScript[editScript.length] = { // deleted
|
|
'status': statusNotInBig,
|
|
'value': smlArray[--smlIndex],
|
|
'index': smlIndex });
|
|
} else {
|
|
--bigIndex;
|
|
--smlIndex;
|
|
if (!options['sparse']) {
|
|
editScript.push({
|
|
'status': "retained",
|
|
'value': bigArray[bigIndex] });
|
|
}
|
|
}
|
|
}
|
|
|
|
// Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
|
|
// smlIndexMax keeps the time complexity of this algorithm linear.
|
|
ko.utils.findMovesInArrayComparison(notInBig, notInSml, !options['dontLimitMoves'] && smlIndexMax * 10);
|
|
|
|
return editScript.reverse();
|
|
}
|
|
|
|
return compareArrays;
|
|
})();
|
|
|
|
ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
|
|
(function () {
|
|
// Objective:
|
|
// * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
|
|
// map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
|
|
// * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
|
|
// so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
|
|
// previously mapped - retain those nodes, and just insert/delete other ones
|
|
|
|
// "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
|
|
// You can use this, for example, to activate bindings on those nodes.
|
|
|
|
function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
|
|
// Map this array value inside a dependentObservable so we re-map when any dependency changes
|
|
var mappedNodes = [];
|
|
var dependentObservable = ko.dependentObservable(function() {
|
|
var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || [];
|
|
|
|
// On subsequent evaluations, just replace the previously-inserted DOM nodes
|
|
if (mappedNodes.length > 0) {
|
|
ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);
|
|
if (callbackAfterAddingNodes)
|
|
ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
|
|
}
|
|
|
|
// Replace the contents of the mappedNodes array, thereby updating the record
|
|
// of which nodes would be deleted if valueToMap was itself later removed
|
|
mappedNodes.length = 0;
|
|
ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
|
|
}, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });
|
|
return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };
|
|
}
|
|
|
|
var lastMappingResultDomDataKey = ko.utils.domData.nextKey(),
|
|
deletedItemDummyValue = ko.utils.domData.nextKey();
|
|
|
|
ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes, editScript) {
|
|
array = array || [];
|
|
if (typeof array.length == "undefined") // Coerce single value into array
|
|
array = [array];
|
|
|
|
options = options || {};
|
|
var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey);
|
|
var isFirstExecution = !lastMappingResult;
|
|
|
|
// Build the new mapping result
|
|
var newMappingResult = [];
|
|
var lastMappingResultIndex = 0;
|
|
var currentArrayIndex = 0;
|
|
|
|
var nodesToDelete = [];
|
|
var itemsToMoveFirstIndexes = [];
|
|
var itemsForBeforeRemoveCallbacks = [];
|
|
var itemsForMoveCallbacks = [];
|
|
var itemsForAfterAddCallbacks = [];
|
|
var mapData;
|
|
var countWaitingForRemove = 0;
|
|
|
|
function itemAdded(value) {
|
|
mapData = { arrayEntry: value, indexObservable: ko.observable(currentArrayIndex++) };
|
|
newMappingResult.push(mapData);
|
|
if (!isFirstExecution) {
|
|
itemsForAfterAddCallbacks.push(mapData);
|
|
}
|
|
}
|
|
|
|
function itemMovedOrRetained(oldPosition) {
|
|
mapData = lastMappingResult[oldPosition];
|
|
if (currentArrayIndex !== mapData.indexObservable.peek())
|
|
itemsForMoveCallbacks.push(mapData);
|
|
// Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray
|
|
mapData.indexObservable(currentArrayIndex++);
|
|
ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode);
|
|
newMappingResult.push(mapData);
|
|
}
|
|
|
|
function callCallback(callback, items) {
|
|
if (callback) {
|
|
for (var i = 0, n = items.length; i < n; i++) {
|
|
ko.utils.arrayForEach(items[i].mappedNodes, function(node) {
|
|
callback(node, i, items[i].arrayEntry);
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
if (isFirstExecution) {
|
|
ko.utils.arrayForEach(array, itemAdded);
|
|
} else {
|
|
if (!editScript || (lastMappingResult && lastMappingResult['_countWaitingForRemove'])) {
|
|
// Compare the provided array against the previous one
|
|
var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; }),
|
|
compareOptions = {
|
|
'dontLimitMoves': options['dontLimitMoves'],
|
|
'sparse': true
|
|
};
|
|
editScript = ko.utils.compareArrays(lastArray, array, compareOptions);
|
|
}
|
|
|
|
for (var i = 0, editScriptItem, movedIndex, itemIndex; editScriptItem = editScript[i]; i++) {
|
|
movedIndex = editScriptItem['moved'];
|
|
itemIndex = editScriptItem['index'];
|
|
switch (editScriptItem['status']) {
|
|
case "deleted":
|
|
while (lastMappingResultIndex < itemIndex) {
|
|
itemMovedOrRetained(lastMappingResultIndex++);
|
|
}
|
|
if (movedIndex === undefined) {
|
|
mapData = lastMappingResult[lastMappingResultIndex];
|
|
|
|
// Stop tracking changes to the mapping for these nodes
|
|
if (mapData.dependentObservable) {
|
|
mapData.dependentObservable.dispose();
|
|
mapData.dependentObservable = undefined;
|
|
}
|
|
|
|
// Queue these nodes for later removal
|
|
if (ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode).length) {
|
|
if (options['beforeRemove']) {
|
|
newMappingResult.push(mapData);
|
|
countWaitingForRemove++;
|
|
if (mapData.arrayEntry === deletedItemDummyValue) {
|
|
mapData = null;
|
|
} else {
|
|
itemsForBeforeRemoveCallbacks.push(mapData);
|
|
}
|
|
}
|
|
if (mapData) {
|
|
nodesToDelete.push.apply(nodesToDelete, mapData.mappedNodes);
|
|
}
|
|
}
|
|
}
|
|
lastMappingResultIndex++;
|
|
break;
|
|
|
|
case "added":
|
|
while (currentArrayIndex < itemIndex) {
|
|
itemMovedOrRetained(lastMappingResultIndex++);
|
|
}
|
|
if (movedIndex !== undefined) {
|
|
itemsToMoveFirstIndexes.push(newMappingResult.length);
|
|
itemMovedOrRetained(movedIndex);
|
|
} else {
|
|
itemAdded(editScriptItem['value']);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
while (currentArrayIndex < array.length) {
|
|
itemMovedOrRetained(lastMappingResultIndex++);
|
|
}
|
|
|
|
// Record that the current view may still contain deleted items
|
|
// because it means we won't be able to use a provided editScript.
|
|
newMappingResult['_countWaitingForRemove'] = countWaitingForRemove;
|
|
}
|
|
|
|
// Store a copy of the array items we just considered so we can difference it next time
|
|
ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
|
|
|
|
// Call beforeMove first before any changes have been made to the DOM
|
|
callCallback(options['beforeMove'], itemsForMoveCallbacks);
|
|
|
|
// Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
|
|
ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
|
|
|
|
var i, j, lastNode, nodeToInsert, mappedNodes, activeElement;
|
|
|
|
// Since most browsers remove the focus from an element when it's moved to another location,
|
|
// save the focused element and try to restore it later.
|
|
try {
|
|
activeElement = domNode.ownerDocument.activeElement;
|
|
} catch(e) {
|
|
// IE9 throws if you access activeElement during page load (see issue #703)
|
|
}
|
|
|
|
// Try to reduce overall moved nodes by first moving the ones that were marked as moved by the edit script
|
|
if (itemsToMoveFirstIndexes.length) {
|
|
while ((i = itemsToMoveFirstIndexes.shift()) != undefined) {
|
|
mapData = newMappingResult[i];
|
|
for (lastNode = undefined; i; ) {
|
|
if ((mappedNodes = newMappingResult[--i].mappedNodes) && mappedNodes.length) {
|
|
lastNode = mappedNodes[mappedNodes.length-1];
|
|
break;
|
|
}
|
|
}
|
|
for (j = 0; nodeToInsert = mapData.mappedNodes[j]; lastNode = nodeToInsert, j++) {
|
|
ko.virtualElements.insertAfter(domNode, nodeToInsert, lastNode);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
|
|
for (i = 0; mapData = newMappingResult[i]; i++) {
|
|
// Get nodes for newly added items
|
|
if (!mapData.mappedNodes)
|
|
ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
|
|
|
|
// Put nodes in the right place if they aren't there already
|
|
for (j = 0; nodeToInsert = mapData.mappedNodes[j]; lastNode = nodeToInsert, j++) {
|
|
ko.virtualElements.insertAfter(domNode, nodeToInsert, lastNode);
|
|
}
|
|
|
|
// Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
|
|
if (!mapData.initialized && callbackAfterAddingNodes) {
|
|
callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
|
|
mapData.initialized = true;
|
|
lastNode = mapData.mappedNodes[mapData.mappedNodes.length - 1]; // get the last node again since it may have been changed by a preprocessor
|
|
}
|
|
}
|
|
|
|
// Restore the focused element if it had lost focus
|
|
if (activeElement && domNode.ownerDocument.activeElement != activeElement) {
|
|
activeElement.focus();
|
|
}
|
|
|
|
// If there's a beforeRemove callback, call it after reordering.
|
|
// Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
|
|
// some sort of animation, which is why we first reorder the nodes that will be removed. If the
|
|
// callback instead removes the nodes right away, it would be more efficient to skip reordering them.
|
|
// Perhaps we'll make that change in the future if this scenario becomes more common.
|
|
callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
|
|
|
|
// Replace the stored values of deleted items with a dummy value. This provides two benefits: it marks this item
|
|
// as already "removed" so we won't call beforeRemove for it again, and it ensures that the item won't match up
|
|
// with an actual item in the array and appear as "retained" or "moved".
|
|
for (i = 0; i < itemsForBeforeRemoveCallbacks.length; ++i) {
|
|
itemsForBeforeRemoveCallbacks[i].arrayEntry = deletedItemDummyValue;
|
|
}
|
|
|
|
// Finally call afterMove and afterAdd callbacks
|
|
callCallback(options['afterMove'], itemsForMoveCallbacks);
|
|
callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
|
|
}
|
|
})();
|
|
|
|
ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
|
|
ko.nativeTemplateEngine = function () {
|
|
this['allowTemplateRewriting'] = false;
|
|
}
|
|
|
|
ko.nativeTemplateEngine.prototype = new ko.templateEngine();
|
|
ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;
|
|
ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
|
|
var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
|
|
templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
|
|
templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
|
|
|
|
if (templateNodes) {
|
|
return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
|
|
} else {
|
|
var templateText = templateSource['text']();
|
|
return ko.utils.parseHtmlFragment(templateText, templateDocument);
|
|
}
|
|
};
|
|
|
|
ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
|
|
ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
|
|
|
|
ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
|
|
(function() {
|
|
ko.jqueryTmplTemplateEngine = function () {
|
|
// Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
|
|
// doesn't expose a version number, so we have to infer it.
|
|
// Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
|
|
// which KO internally refers to as version "2", so older versions are no longer detected.
|
|
var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
|
|
if (!jQueryInstance || !(jQueryInstance['tmpl']))
|
|
return 0;
|
|
// Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
|
|
try {
|
|
if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
|
|
// Since 1.0.0pre, custom tags should append markup to an array called "__"
|
|
return 2; // Final version of jquery.tmpl
|
|
}
|
|
} catch(ex) { /* Apparently not the version we were looking for */ }
|
|
|
|
return 1; // Any older version that we don't support
|
|
})();
|
|
|
|
function ensureHasReferencedJQueryTemplates() {
|
|
if (jQueryTmplVersion < 2)
|
|
throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
|
|
}
|
|
|
|
function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
|
|
return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
|
|
}
|
|
|
|
this['renderTemplateSource'] = function(templateSource, bindingContext, options, templateDocument) {
|
|
templateDocument = templateDocument || document;
|
|
options = options || {};
|
|
ensureHasReferencedJQueryTemplates();
|
|
|
|
// Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
|
|
var precompiled = templateSource['data']('precompiled');
|
|
if (!precompiled) {
|
|
var templateText = templateSource['text']() || "";
|
|
// Wrap in "with($whatever.koBindingContext) { ... }"
|
|
templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
|
|
|
|
precompiled = jQueryInstance['template'](null, templateText);
|
|
templateSource['data']('precompiled', precompiled);
|
|
}
|
|
|
|
var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
|
|
var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
|
|
|
|
var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
|
|
resultNodes['appendTo'](templateDocument.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
|
|
|
|
jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
|
|
return resultNodes;
|
|
};
|
|
|
|
this['createJavaScriptEvaluatorBlock'] = function(script) {
|
|
return "{{ko_code ((function() { return " + script + " })()) }}";
|
|
};
|
|
|
|
this['addTemplate'] = function(templateName, templateMarkup) {
|
|
document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "<" + "/script>");
|
|
};
|
|
|
|
if (jQueryTmplVersion > 0) {
|
|
jQueryInstance['tmpl']['tag']['ko_code'] = {
|
|
open: "__.push($1 || '');"
|
|
};
|
|
jQueryInstance['tmpl']['tag']['ko_with'] = {
|
|
open: "with($1) {",
|
|
close: "} "
|
|
};
|
|
}
|
|
};
|
|
|
|
ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
|
|
ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine;
|
|
|
|
// Use this one by default *only if jquery.tmpl is referenced*
|
|
var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
|
|
if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
|
|
ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
|
|
|
|
ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
|
|
})();
|
|
}));
|
|
}());
|
|
})();
|