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POaddEventListener in JS not working as expected
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  1. POaddEventListener in JS not working as expected
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    copied!<p>Firstly skim codes please.</p> <p>index.html is :</p> <pre><code>&lt;html&gt;&lt;head&gt;&lt;title&gt;Home&lt;/title&gt;&lt;script src="js/script.js"&gt;&lt;/script&gt;&lt;/head&gt; &lt;body onLoad="init()"&gt; &lt;ul class="sup" id="sup"&gt; &lt;li class="supitem"&gt; &lt;a href="#" class="supcont"&gt;Home&lt;div class="v"&gt;&lt;/div&gt;&lt;/a&gt; &lt;ul class="sub"&gt; &lt;li class="subitem"&gt;&lt;a href="#" class="subcont"&gt;Home1&lt;/a&gt;&lt;/li&gt; &lt;li class="subitem"&gt;&lt;a href="#" class="subcont"&gt;Home2&lt;/a&gt;&lt;/li&gt; &lt;li class="subitem"&gt;&lt;a href="#" class="subcont"&gt;Home3&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li class="supitem"&gt; &lt;a href="#" class="supcont"&gt;Blog&lt;div class="v"&gt;&lt;/div&gt;&lt;/a&gt; &lt;ul class="sub"&gt; &lt;li class="subitem"&gt;&lt;a href="#" class="subcont"&gt;Blog1&lt;/a&gt;&lt;/li&gt; &lt;li class="subitem"&gt;&lt;a href="#" class="subcont"&gt;Blog2&lt;/a&gt;&lt;/li&gt; &lt;li class="subitem"&gt;&lt;a href="#" class="subcont"&gt;Blog3&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>script.js is :</p> <pre><code>function init() { var sky = 0; var sup = document.getElementById("sup"); var supitems = sup.getElementsByClassName("supitem"); for (var i = 0, ln = supitems.length; i &lt; ln; i++) { var supconts = supitems[i].getElementsByClassName("supcont"); var subs = supitems[i].getElementsByClassName("sub"); var supcont = supconts[0]; supcont.innerHTML = "SuperMenu"+i; if (subs.length &gt; 0) { var sub = subs[0]; supcont.addEventListener("click",function() { toggleVisibility(sub); }); supcont.style.background = "#"+sky+sky+sky; sub.style.background = "#"+sky+sky+sky; sky += 4; } } } function toggleVisibility(object) { object.style.visibility = (object.style.visibility == "hidden" ?"visible" :"hidden"); } </code></pre> <p>What I would like to do is when I press supermenu all sub-menus' visibility to be toggled. But I don't know where I have made a mistake. When I press Supmenu0, submenus of Supmenu1 are toggled, not submenus of Supmenu1. Thanks in advance.</p> <p>P.S. I think the problem is in addEventListener.</p>
 

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