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PO$(":focus") returns no element for <input type="file" /> in Firefox
 

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  1. PO$(":focus") returns no element for <input type="file" /> in Firefox
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    <p>I can't seem to get the currently focused/active element as a jQuery object <em>in Firefox</em>, if it is an <code>&lt;input type="file" /&gt;</code>. It works on other input types (text, password, submit, others) and on other element types (<code>&lt;select&gt;</code>, <code>&lt;textarea&gt;</code>, others).</p> <h2>HTML</h2> <pre class="lang-html prettyprint-override"><code>&lt;input type="file" /&gt; </code></pre> <h2>Javascript</h2> <pre class="lang-js prettyprint-override"><code>// Cannot find input type file elements with :focus, // $focused.length is always 0 in Firefox (tested using FF 10.0.1) var $focusedTest1 = $(':focus'); // This line throws for Firefox (tested using FF 10.0.1) // Permission denied to access property 'nodeType' // @ http://code.jquery.com/jquery-1.7.1.js:108 // in jQuery.fn.init, below "Handle $(DOMElement)" var $focusedTest2 = $(document.activeElement); </code></pre> <h2>Steps to reproduce</h2> <ol> <li>Use Firefox.</li> <li>Focus the file box: <ul> <li>press tab until you reach it</li> <li>or click in it.</li> </ul></li> <li>While focusing the file box, try to get a result from <code>$(':focus')</code>.</li> </ol> <p>See <a href="http://jsfiddle.net/joelpurra/bzsv7/" rel="nofollow">jsFiddle demonstration of getting the id of the focused element</a> - test it with Firefox.</p> <p><strong>Does anyone have a solution for getting the focused/active element as a jQuery object that works for <code>&lt;input type="file" /&gt;</code>?</strong></p> <p>The solution needs to be fully generic as the functionality is part of a plugin. I will not have control over the page the script will run on.</p>
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    1. COI have found something that works (in the test case at least), but it involves document level listeners and try-catch logic. Will post it in a little while.
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    2. COhmm, the document.activeElement seems to yield a textfield with no id, that seems to be the problem. And somehow it's just a different kind of element, can't do much with it.
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      1. USJohan
    3. CO@Johan: It might be an [XrayWrapper object](https://developer.mozilla.org/en/XPConnect_wrappers), which I suspect is part of the problem. *"Wrappers can appear in the console log; for example "[object XrayWrapper [object blah]]". Because these are wrapped, you won't be able to peek down inside them from the console."*
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