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    <p>Your code works fine on IE9 &amp; IE10. However, previous versions do not support <code>addEventListener</code>, and the <code>attachEvent</code> method <a href="http://www.quirksmode.org/js/events_order.html" rel="nofollow noreferrer">does not supply a <code>currentTarget</code> property</a>. For this reason, the only way to determine the calling object is to replace the <code>this</code> reference <a href="https://stackoverflow.com/a/4590302/1170489">via prototyping</a> (or use a framework).</p> <p>Another problem with your code is that IE8 does not support <code>getElementsByClassName()</code>. While your code tests for this, the fallback tries to use it again to instantiate <code>subMenuItems</code>. A better approach would be to use <a href="https://developer.mozilla.org/en-US/docs/DOM/Document.querySelectorAll" rel="nofollow noreferrer">Document.querySelectorAll</a>, which works in IE8 and up and would allow you to avoid duplicated code.</p> <p>Complete example:</p> <pre><code>Element.prototype.addAnEvent = function(name, funct) { if (this.addEventListener) { this.addEventListener(name, funct, false); } else if (this.attachEvent) { var _this = this; this.attachEvent("on" + name, function() { funct.apply(_this); // where the value of "this" in funct should point to "element" }); } }; function initiate() { var sideMenuOptions = document.querySelectorAll('.sidemenu-maincat'); for (var i = 0; i &lt; sideMenuOptions.length; i++) { sideMenuOptions[i].addAnEvent('click', function() { openSubmenu(this); }); } } function openSubmenu(element) { var subMenuItems = element.querySelectorAll('.sidemenu-subcat'); for (var s = 0; s &lt; subMenuItems.length; s++) { var subItem = subMenuItems[s]; if (subItem.offsetWidth === 0 &amp;&amp; subItem.offsetHeight === 0) { subItem.className = 'sidemenu-subcat'; } else { subItem.className = subItem.className + ' hidden'; } } } window.onload = initiate; </code></pre>
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    1. POJavascript dropdown menu not working in Internet Explorer
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    1. COSo I just put this in front of my line of code with the `addEventListener`? I'm quite new with javascript and I don't fully understand all of this code.
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    2. COI don't really understand how to get it to work :/
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    3. COBenji - I added a complete code example. Hope this helps.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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