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    <p>Add the following CSS and JavaScript to your page, and use the <code>addResizeListener</code> and <code>removeResizeListener</code> methods to listen for element size changes (blog post for further details: <a href="http://www.backalleycoder.com/2013/03/18/cross-browser-event-based-element-resize-detection/" rel="nofollow noreferrer">http://www.backalleycoder.com/2013/03/18/cross-browser-event-based-element-resize-detection/</a>):</p> <p><strong>Resize Sensor CSS</strong></p> <pre><code>.resize-triggers { visibility: hidden; } .resize-triggers, .resize-triggers &gt; div, .contract-trigger:before { content: " "; display: block; position: absolute; top: 0; left: 0; height: 100%; width: 100%; overflow: hidden; } .resize-triggers &gt; div { background: #eee; overflow: auto; } .contract-trigger:before { width: 200%; height: 200%; } </code></pre> <p><strong>Resize Event Methods</strong></p> <p>The following is the JavaScript you’ll need to enable resize event listening. The first two functions are prerequisites that are used in the main addResizeListener and removeResizeListener methods.</p> <pre><code>(function(){ var attachEvent = document.attachEvent; if (!attachEvent) { var requestFrame = (function(){ var raf = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || function(fn){ return window.setTimeout(fn, 20); }; return function(fn){ return raf(fn); }; })(); var cancelFrame = (function(){ var cancel = window.cancelAnimationFrame || window.mozCancelAnimationFrame || window.webkitCancelAnimationFrame || window.clearTimeout; return function(id){ return cancel(id); }; })(); function resetTriggers(element){ var triggers = element.__resizeTriggers__, expand = triggers.firstElementChild, contract = triggers.lastElementChild, expandChild = expand.firstElementChild; contract.scrollLeft = contract.scrollWidth; contract.scrollTop = contract.scrollHeight; expandChild.style.width = expand.offsetWidth + 1 + 'px'; expandChild.style.height = expand.offsetHeight + 1 + 'px'; expand.scrollLeft = expand.scrollWidth; expand.scrollTop = expand.scrollHeight; }; function checkTriggers(element){ return element.offsetWidth != element.__resizeLast__.width || element.offsetHeight != element.__resizeLast__.height; } function scrollListener(e){ var element = this; resetTriggers(this); if (this.__resizeRAF__) cancelFrame(this.__resizeRAF__); this.__resizeRAF__ = requestFrame(function(){ if (checkTriggers(element)) { element.__resizeLast__.width = element.offsetWidth; element.__resizeLast__.height = element.offsetHeight; element.__resizeListeners__.forEach(function(fn){ fn.call(element, e); }); } }); }; } window.addResizeListener = function(element, fn){ if (attachEvent) element.attachEvent('resize', fn); else { if (!element.__resizeTriggers__) { if (getComputedStyle(element).position == 'static') element.style.position = 'relative'; element.__resizeLast__ = {}; element.__resizeListeners__ = []; (element.__resizeTriggers__ = document.createElement('div')).className = 'resize-triggers'; element.__resizeTriggers__.innerHTML = '&lt;div class="expand-trigger"&gt;&lt;div&gt;&lt;/div&gt;&lt;/div&gt;' + '&lt;div class="contract-trigger"&gt;&lt;/div&gt;'; element.appendChild(element.__resizeTriggers__); resetTriggers(element); element.addEventListener('scroll', scrollListener, true); } element.__resizeListeners__.push(fn); } }; window.removeResizeListener = function(element, fn){ if (attachEvent) element.detachEvent('resize', fn); else { element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1); if (!element.__resizeListeners__.length) { element.removeEventListener('scroll', scrollListener); element.__resizeTriggers__ = !element.removeChild(element.__resizeTriggers__); } } } })(); </code></pre> <p><strong>Demo-licious!</strong></p> <p>Here’s a pseudo code usage of the method.</p> <pre><code>var myElement = document.getElementById('my_element'), myResizeFn = function(){ /* do something on resize */ }; addResizeListener(myElement, myResizeFn); removeResizeListener(myElement, myResizeFn); </code></pre>
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