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POJavascript dropdown menu not working in Internet Explorer
 

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  1. POJavascript dropdown menu not working in Internet Explorer
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    <p>I've got a dropdown menu that I'm having trouble to get to work in Internet Explorer. It's working fine with Chrome and Firefox but it doesn't do anything in Internet Explorer. And I prefer to keep all my javascript in my separate document javascript.js as well as I don't want to work with a library. The HTML code I'm using is this:</p> <pre><code>&lt;div id="sidemeny-container"&gt; &lt;div class="sidemenu-maincat"&gt; &lt;img src="cat1.jpg" alt="cat1" /&gt; &lt;div class="sidemenu-subcat hidden"&gt; &lt;a href="subcat1.html"&gt; - Subcat 1 &lt;/a&gt; &lt;/div&gt; &lt;div class="sidemenu-subcat hidden"&gt; &lt;a href="subcat2.html"&gt; - Subcat 2 &lt;/a&gt; &lt;/div&gt; &lt;div class="sidemenu-subcat hidden"&gt; &lt;a href="subcat3.html"&gt; - Subcat 3 &lt;/a&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class="sidemenu-maincat"&gt; &lt;img src="cat2.jpg" alt="cat2" /&gt; &lt;div class="sidemenu-subcat hidden"&gt; &lt;a href="subcat2-1.html"&gt; - Subcat 2-1 &lt;/a&gt; &lt;/div&gt; &lt;div class="sidemenu-subcat hidden"&gt; &lt;a href="subcat2-2.html"&gt; - Subcat 2-2 &lt;/a&gt; &lt;/div&gt; &lt;div class="sidemenu-subcat hidden"&gt; &lt;a href="subcat2-3.html"&gt; - Subcat 2-3 &lt;/a&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>And the CSS code:</p> <pre><code>#sidemeny-container { border-bottom:1px #000 solid; height: auto; width: 153px; float:left; padding: 10px 0px 0px 0px; } .sidemenu-maincat { border-top: 1px #000 solid; border-right: 1px #000000 solid; width:148px; height:auto; float:left; padding: 0px 0px 0px 5px; } .sidemenu-subcat.hidden { display:none; width:148px; height:auto; float:left; padding: 0px 0px 0px 15px; } </code></pre> <p>And the javascript, which I have in a separate .js document:</p> <pre><code> function initiate() { if (document.getElementsByClassName) { var sideMenuOptions = document.getElementsByClassName('sidemenu-maincat'); for (var i = 0; i &lt; sideMenuOptions.length; i++) { sideMenuOptions[i].addEventListener('click', function () { var subMenuItems = this.getElementsByClassName('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'; } } }); } } else { var sideMenuOptions = document.getElementsByTagName('div'); for (var i = 0; i &lt; sideMenuOptions.length; i++) { if (sideMenuOptions[i].className == 'sidemenu-maincat') { sideMenuOptions[i].addEventListener('click', function () { var subMenuItems = this.getElementsByClassName('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. COPress F12 to bring up the developer tools and press "Start debugging" on the script tab then rerun your code. Are there any errors? IE likes to silently fail unless you tell it you want to know.
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    2. CO@Plynx It says "Object doesn't support this propery or method" and marks up from the line that starts `sideMenuOptions[i]` and the rest of the script.
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    3. COWhat version of IE is this? IE 8 and less did not support `addEventListener`.
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