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