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POWhy is this a memory leak in JavaScript?
 

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  1. POWhy is this a memory leak in JavaScript?
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    <p>I was reading this article ( <a href="http://www.ibm.com/developerworks/web/library/wa-memleak/" rel="nofollow">http://www.ibm.com/developerworks/web/library/wa-memleak/</a> ) on IBM's website about memory leaks in JavaScript when I came across a memory leak that didn't quite look liked it leaked:</p> <pre><code>&lt;html&gt; &lt;body&gt; &lt;script type="text/javascript"&gt; document.write("Program to illustrate memory leak via closure"); window.onload=function outerFunction(){ var obj = document.getElementById("element"); obj.onclick=function innerFunction(){ alert("Hi! I will leak"); }; obj.bigString=new Array(1000).join(new Array(2000).join("XXXXX")); // This is used to make the leak significant }; &lt;/script&gt; &lt;button id="element"&gt;Click Me&lt;/button&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>I understood all the other leaks but this one stood out. It says there's a circular reference between the DOM and JavaScript object but I don't see it. </p> <p>Can anyone shed some light on this?</p> <p>EDIT: The link seems to have been taken down (I even refreshed the page I had up and it was down). Here's Google's cache (for as long as that lasts: <a href="http://webcache.googleusercontent.com/search?q=cache%3akLR-FJUeKv0J%3awww.ibm.com/developerworks/web/library/wa-memleak/%20memory%20management%20in%20javascript&amp;cd=1&amp;hl=en&amp;ct=clnk&amp;gl=us&amp;client=firefox-a" rel="nofollow">http://webcache.googleusercontent.com/search?q=cache:kLR-FJUeKv0J:www.ibm.com/developerworks/web/library/wa-memleak/+memory+management+in+javascript&amp;cd=1&amp;hl=en&amp;ct=clnk&amp;gl=us&amp;client=firefox-a</a> )</p>
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    1. COIt's not just you. I dont see a circular reference here either.
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    2. COYour IBM link is broken
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    3. COYour link doesn't work? Your DOM object `obj` references `innerFunction`. `innerFunction`, in turn, has a reference to the obj through the closure. You should be able to avoid the memory leak by setting obj.onclick to null onunload.
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      1. POWhy is this a memory leak in JavaScript?
      1. USJuan Mendes
 

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