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POjQuery Drag-and-Drop Flickering on Hover (Webkit only)
 

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  1. POjQuery Drag-and-Drop Flickering on Hover (Webkit only)
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    <h2>Issue</h2> <p>I've just finished implementing a feature in which users can drag files into the browser and drop upon a supporting File Upload plugin, which processes the drop.</p> <p>However, in order to give users a hint that they can even drop things in the first place, I've implemented a <code>dragover</code> event to show a <code>div</code> that says something akin to "Drop Here". This, in turn, hides the <code>div</code> which has the "Choose File..." button, and replaces it, until the user stops dragging.</p> <p>But it seems, when I implement this, dragging over the target area is causing flickering. To be clear:</p> <ul> <li><code>div</code> with "Choose File" interface is shown.</li> <li>Item dragged (or selected text dragged); "Drop here" is shown.</li> <li>Item dragged over the "Drop here" area; flickering begins.</li> </ul> <p>Additionally:</p> <ul> <li>There is no issue in Opera 12 or Firefox 16.</li> <li>The issue is blatantly obvious in Chrome 23 and Safari 5.</li> <li>The issue is partly there in IE 9 (IE 10 untested); it flickers for about 5 seconds, then stops.</li> </ul> <h2><a href="http://jsfiddle.net/ezCEG/" rel="noreferrer">jsFiddle</a></h2> <p><em>(Warning: the fiddle is very crude.)</em></p> <p>Just select some of the text and drag it over the blue box and you will see what happens; it will be obvious the behavior it should not be exhibiting.</p> <h3>Code used in fiddle</h3> <pre><code>var $dropTarget = $("#container"); $(document).bind("dragover", function(e) { if ($dropTarget.hasClass("highlight")) return; $dropTarget.addClass("highlight"); $dropTarget.find("[name='drop']").show(); $dropTarget.find("[name='drag']").hide(); }).bind("dragleave drop", function(e) { if (!$dropTarget.hasClass("highlight")) return; $dropTarget.removeClass("highlight"); $dropTarget.find("[name='drop']").hide(); $dropTarget.find("[name='drag']").show(); });​ </code></pre> <h2>My solution...?</h2> <p>To be honest, I've got no idea of what to try. There is not extensive documentation on the behavior of <code>dragover</code> or <code>dragleave</code>, and I don't even know why this is happening, so I can't even begin to debug it. I feel like <code>dragover</code> should only fire once, but even dragging around the screen just fires it over and over and over again.</p> <p>I've looked at Google Images and Google Contacts for their drag-and-drop behavior, but their code is completely minified and unreadable, and I can't even find any specified "drag" behavior.</p> <p>So, is there some fix to this seemingly odd behavior? If this is a bug in WebKit, which I suspect, is there some brilliant workaround and/or hack I can use?</p> <p>Thanks to everyone for their time!</p>
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