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POIf / Else on Function
 

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    <p>I am using Paul Hayes' CSS Transitions Media Query script and can not figure out how to do a simple if/else.</p> <p>Here is what I am going after:</p> <pre><code>mql('all and (max-width: 959px)', change); mql('all and (min-width: 960px)', change); function change(mql) { if(max-width: 959px) { console.log("Do this"); } else { console.log("Do that"); } } </code></pre> <p>Here is <code>mql</code> / paul's script:</p> <pre><code>mql = (function(doc, undefined) { var docElem = doc.documentElement, refNode = docElem.firstElementChild || docElem.firstChild, idCounter = 0; if(!doc.getElementById('mq-style')) { style = doc.createElement('style'); style.id = 'mq-style'; style.textContent = '.mq { -webkit-transition: width 0.001ms; -moz-transition: width 0.001ms; -o-transition: width 0.001ms; -ms-transition: width 0.001ms; width: 0; position: absolute; top: -100em; }\n'; docElem.insertBefore(style, refNode); } var transitionEnds = Array('transitionend','webkitTransitionEnd','oTransitionEnd','msTransitionEnd'); for(var i in transitionEnds) { if ('on'+ transitionEnds[i].toLowerCase() in window) transitionEnd = transitionEnds[i]; } return function(q, cb) { var id = 'mql-' + idCounter++, callback = function() { // perform test and send results to callback cb({ matches: (div.offsetWidth == 42), media: q }); }, div = doc.createElement('div'); div.className = 'mq'; // mq class in CSS declares width: 0 and transition on width of duration 0.001ms div.id = id; style.textContent += '@media ' + q + ' { #' + div.id + ' { width: 42px; } }\n'; // add transition event listener div.addEventListener(transitionEnd, callback, false); docElem.insertBefore(div, refNode); // original polyfill removes element, we need to keep element for transitions to continue and events to fire. return { matches: div.offsetWidth == 42, media: q }; }; })(document); </code></pre>
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