StackOverflow2013

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plurals

PO
primarykey
Id
9301634
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-02-15T21:23:23.950
FavoriteCount
0
LastActivityDate
2012-02-26T14:23:54.810
LastEditDate
2017-05-23T10:34:20.603
LastEditorUserId
-1
OwnerUserId
907779
ParentId
9301310
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
<p><strong>Edit:</strong> This solution has been implemented where <a href="https://github.com/joelpurra/emulatetab/issues/2" rel="nofollow noreferrer">the problem was first found</a>, in <a href="http://joelpurra.github.com/emulatetab" rel="nofollow noreferrer">EmulateTab</a>. See <a href="https://github.com/joelpurra/emulatetab/blob/master/src/emulatetab.joelpurra.js#L97" rel="nofollow noreferrer">getFocusedElement()</a>.</p> <hr> <p>Found a solution myself, after a break from coding - but it is not a very <em>clean</em> solution. It is basically the <a href="https://stackoverflow.com/a/9301634/907779">same solution</a> suggested by <a href="https://stackoverflow.com/users/182705/neil">@Neil</a> while I first wrote this post.</p> <p>Try <a href="http://jsfiddle.net/joelpurra/bzsv7/2/" rel="nofollow noreferrer">the updated jsFiddle version with focus listeners and try-catch logic</a> in Firefox. It combines <code>:focus</code>, <code>document.activeElement</code> and document level focus listeners that keep track of the last "known" focused element.</p> <h2>Function to find focused element</h2> <pre><code>// Comined function to get the focused element trying as long as possible. // Extra work done trying to avoid problems with security features around // <input type="file" /> in Firefox (tested using 10.0.1). function getFocused() { // Try the well-known, recommended method first. var $focused = $(':focus'); if ($focused.size() === 0) { try { // Fall back to a fast method that might fail. // Known to fail for Firefox (tested using 10.0.1) with // Permission denied to access property 'nodeType'. $focused = $(document.activeElement) } catch (error1) { warnToConsole("Could not use document.activeElement", document.activeElement, error1); if (lastFocusedElement !== null) { try { // As a last resort, use the last known focused element. // Has not been tested enough to be sure it works as expected. $focused = $(lastFocusedElement); } catch (error3) { warnToConsole("Could not use lastFocusedElement ", lastFocusedElement, error3); } } } } return $focused; } </code></pre> <h2>Focus listeners</h2> <pre><code>// Keep a reference to the last focused element, use as a last resort. var lastFocusedElement = null; function focusInElement(event) { lastFocusedElement = event.target; } function focusOutElement(event) { lastFocusedElement = null; } // Start listeners. $(function() { // Start listeners that keep track of the last focused element. $(document).on("focusin", focusInElement); $(document).on("focusout", focusOutElement); }); </code></pre> <p>I don't like this solution very much, as it is far from as clean as just a one-line <code>$(':focus')</code>. Other answers are welcome!</p>
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1. PO$(":focus") returns no element for <input type="file" /> in Firefox
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