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POHow do I find where a variable is defined at runtime?
 

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  1. POHow do I find where a variable is defined at runtime?
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    <p>I've been using jQuery and YUI side-by-side with no issues until recently. Occasionally, inside of a callback for, say, a YUI button, <code>$</code> will be shadowed by some other function (click for big version): <a href="https://i.stack.imgur.com/o0y4B.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/o0y4B.png" alt="console"></a></p> <p>and for the life of me, <em>I cannot figure out why this is happening</em>. Yes, I know I could be safe and use <code>jQuery</code> or <code>window.$</code> everywhere instead of just <code>$</code>, but that's just a workaround and not an actual fix.</p> <p>At runtime, how can I find where this <code>$</code> impostor is coming from? - e.g. find where it's declared, and why it's in my bleedin' scope.</p> <hr> <p>It turns out that this behavior is easily reproduced (at least in Chrome and Firefox 4) right here on Stack Overflow, since SO uses jQuery (again, click for full size):</p> <p><a href="https://i.stack.imgur.com/DSwZ3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DSwZ3.png" alt="more console"></a> <a href="https://stack.i.imgur.com/9c4aL.png" rel="nofollow noreferrer"><img src="https://i.imgur.com/9c4aL.png" alt="still more console"></a></p> <p>I can only infer that <code>$</code> as </p> <pre><code>function () { return document.getElementById.apply(document, arguments) } </code></pre> <p>must be from the console itself!</p> <h2>Found it.</h2> <p><code>with</code> strikes again.</p> <p><img src="https://i.stack.imgur.com/Yd3DU.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/IThcT.png" alt="enter image description here"></p> <p>Chromium bug for this: <a href="http://code.google.com/p/chromium/issues/detail?id=70969" rel="nofollow noreferrer">http://code.google.com/p/chromium/issues/detail?id=70969</a></p>
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    1. USMatt Ball
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    1. COIn the upper right corner of your screen shot - the Search Scripts input box - search for: `return document.getElementById.apply(document, arguments)`
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      1. USŠime Vidas
    2. COI think the only way to really find out would be to go line-by-line in a debugger, like what Juan suggested, to see where $ is being introduced. If it really is some Chrome problem... it should be fixed ASAP.
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    3. CO@vol7ron: http://code.google.com/p/chromium/issues/detail?id=70969
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      1. USMatt Ball
 

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