149 lines
4.9 KiB
JavaScript
Executable File
149 lines
4.9 KiB
JavaScript
Executable File
/*! matchMedia() polyfill - Test a CSS media type/query in JS. Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas, David Knight. MIT license */
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window.matchMedia || (window.matchMedia = function() {
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"use strict";
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// For browsers that support matchMedium api such as IE 9 and webkit
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var styleMedia = (window.styleMedia || window.media);
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// For those that don't support matchMedium
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if (!styleMedia) {
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var style = document.createElement('style'),
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script = document.getElementsByTagName('script')[0],
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info = null;
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style.type = 'text/css';
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style.id = 'matchmediajs-test';
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if (!script) {
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document.head.appendChild(style);
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} else {
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script.parentNode.insertBefore(style, script);
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}
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// 'style.currentStyle' is used by IE <= 8 and 'window.getComputedStyle' for all other browsers
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info = ('getComputedStyle' in window) && window.getComputedStyle(style, null) || style.currentStyle;
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styleMedia = {
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matchMedium: function(media) {
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var text = '@media ' + media + '{ #matchmediajs-test { width: 1px; } }';
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// 'style.styleSheet' is used by IE <= 8 and 'style.textContent' for all other browsers
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if (style.styleSheet) {
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style.styleSheet.cssText = text;
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} else {
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style.textContent = text;
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}
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// Test if media query is true or false
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return info.width === '1px';
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}
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};
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}
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return function(media) {
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return {
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matches: styleMedia.matchMedium(media || 'all'),
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media: media || 'all'
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};
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};
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}());
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/*! matchMedia() polyfill addListener/removeListener extension. Author & copyright (c) 2012: Scott Jehl. Dual MIT/BSD license */
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(function() {
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// Bail out for browsers that have addListener support
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if (window.matchMedia && window.matchMedia('all').addListener) {
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return false;
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}
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var localMatchMedia = window.matchMedia,
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hasMediaQueries = localMatchMedia('only all').matches,
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isListening = false,
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timeoutID = 0, // setTimeout for debouncing 'handleChange'
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queries = [], // Contains each 'mql' and associated 'listeners' if 'addListener' is used
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handleChange = function(evt) {
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// Debounce
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clearTimeout(timeoutID);
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timeoutID = setTimeout(function() {
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for (var i = 0, il = queries.length; i < il; i++) {
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var mql = queries[i].mql,
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listeners = queries[i].listeners || [],
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matches = localMatchMedia(mql.media).matches;
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// Update mql.matches value and call listeners
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// Fire listeners only if transitioning to or from matched state
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if (matches !== mql.matches) {
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mql.matches = matches;
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for (var j = 0, jl = listeners.length; j < jl; j++) {
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listeners[j].call(window, mql);
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}
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}
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}
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}, 30);
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};
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window.matchMedia = function(media) {
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var mql = localMatchMedia(media),
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listeners = [],
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index = 0;
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mql.addListener = function(listener) {
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// Changes would not occur to css media type so return now (Affects IE <= 8)
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if (!hasMediaQueries) {
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return;
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}
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// Set up 'resize' listener for browsers that support CSS3 media queries (Not for IE <= 8)
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// There should only ever be 1 resize listener running for performance
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if (!isListening) {
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isListening = true;
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window.addEventListener('resize', handleChange, true);
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}
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// Push object only if it has not been pushed already
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if (index === 0) {
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index = queries.push({
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mql: mql,
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listeners: listeners
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});
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}
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listeners.push(listener);
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};
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mql.removeListener = function(listener) {
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for (var i = 0, il = listeners.length; i < il; i++) {
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if (listeners[i] === listener) {
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listeners.splice(i, 1);
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}
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}
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};
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return mql;
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};
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}());
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window.mediaCheck = function(options) {
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var mq;
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function mqChange(mq, options) {
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if (mq.matches) {
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if (typeof options.entry === "function") {
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options.entry();
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}
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} else if (typeof options.exit === "function") {
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options.exit();
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}
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};
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mq = window.matchMedia(options.media);
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mq.addListener(function() {
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mqChange(mq, options);
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});
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mqChange(mq, options);
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};
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