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POFailure to override Element's addEventListener in Firefox
 

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  1. POFailure to override Element's addEventListener in Firefox
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    <p>I'm trying to override the Element object's <code>addEventListener</code> method, in a cross-browser manner. The purpose is so that I can load some 3rd party scripts asynchronously, and those scripts call this method prematurely. </p> <p>I created an HTML file that works perfectly in Chrome, but on Firefox I get this exception:</p> <blockquote> <p>"Illegal operation on WrappedNative prototype object" nsresult: "0x8057000c (NS_ERROR_XPC_BAD_OP_ON_WN_PROTO)" </p> </blockquote> <p>If you comment out the lines in the file that change the INSTANCE methods, it works. But I need to do it on the "class type" (i.e. prototype). </p> <p>Any suggestions would be appreciated.</p> <p>Thanks, Guypo</p> <p>Here's the file I created</p> <pre><code>&lt;html&gt;&lt;body&gt; &lt;img id="testImg" src="http://www.blaze.io/wp-content/themes/Blaze/images/header_logoB.png"&gt; &lt;script&gt; function myLog(msg) { "undefined" != typeof(console) &amp;&amp; console.log("Log: " + msg); } function customListener(type, event, useCapture) { // Register the event myLog('Registering event'); this._origListener.apply(this, arguments); } // Also tried HTMLImageElement Element.prototype._origListener = Element.prototype.addEventListener; Element.prototype.addEventListener = customListener; var img = document.getElementById("testImg"); // Uncommenting these lines works - but in the real case I can't access these objects //img._origListener = img.addEventListener; //img.addEventListener = customListener; img.addEventListener('load',function() { myLog('load callback'); }, false); &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. USMarcel Korpel
    1. USGuypo
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      1. USMisha Reyzlin
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    1. COI think element prototyping isn't cross-compatible, I would suggest using jQuery or some framework.
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    2. COI agree, but I can't modify the 3rd party scripts I'm using, so my only option is to change the JavaScript environment they run in by changing the prototype
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