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POChrome sometimes calls incorrect constructor
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  1. POChrome sometimes calls incorrect constructor
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    copied!<p>We have a web site that uses extensively jQuery and it works fine in Firefox and IE. However in Chrome, we are getting frequently (and semi-randomly) <code>Uncaught TypeError: Cannot call method 'apply' of undefined</code> (also other jQuery methods appear in place of <code>apply</code>).</p> <p>We managed to track down the problem to jQuery method <code>pushStack()</code>.</p> <p>Original source code (jQuery 1.7.1):</p> <pre><code>// Take an array of elements and push it onto the stack // (returning the new matched element set) pushStack: function( elems, name, selector ) { // Build a new jQuery matched element set var ret = this.constructor(); // (etc.) } </code></pre> <p>Instrumented code:</p> <pre><code>pushStack: function( elems, name, selector ) { if (!(this instanceof jQuery.fn.init)) throw this; // Build a new jQuery matched element set var ret = this.constructor(); if (!(ret instanceof jQuery.fn.init)) { console.log("pushStack&gt;this: " + this.constructor); console.log("pushStack&gt;ret: " + ret.constructor); throw ret; } // (etc.) } </code></pre> <p>In most cases <code>pushStack()</code> runs correctly. However sometimes Chrome constructs an object of type <code>Object</code> instead of <code>jQuery.fn.init</code>. Console output:</p> <pre><code>pushStack&gt;this: function ( selector, context ) { // The jQuery object is actually just the init constructor 'enhanced' return new jQuery.fn.init( selector, context, rootjQuery ); } pushStack&gt;ret: function Object() { [native code] } Uncaught #&lt;Object&gt; </code></pre> <p>Did anybody encounter similar problem? Is it a (known) bug of Chrome?</p> <p><strong>Update</strong></p> <p>I managed to simplify our page, so that it could be loaded on its own. I filled <a href="http://code.google.com/p/chromium/issues/detail?id=125148" rel="noreferrer">bug in Chromium project</a> project, the page for reproducing the issue is attached there. </p>
 

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