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    <p>If <code>files</code> doesn't exist on <code>e.target</code>, you're looking for a <code>files</code> on <code>e.dataTransfer</code>&nbsp;&mdash; but if there's no <code>dataTransfer</code> property on <code>e</code> (and there doesn't seem to be in your screenshot) you'll try to dereference <code>undefined</code>, resulting in this error.</p> <p>I'd change the code to:</p> <pre><code>function HandleDropEvent(e){ var files = e.target.files || (e.dataTransfer &amp;&amp; e.dataTransfer.files); if (files) { UploadFile(files[0]); } else { // Perhaps some kind of message here } } </code></pre> <p>That way, if <code>e.target.files</code> doesn't exist and <code>e.dataTransfer</code> <em>also</em> doesn't exist, you'll get <code>files</code> being <code>undefined</code>, rather than an error.</p> <hr> <p>The event object that jQuery gives you is created and normalized by jQuery. Since we know <code>e.dataTransfer</code> doesn't exist on that event object (from your screenshot), my guess is that it's not one of the properties jQuery copies over from the original event object. That's okay, though, because jQuery gives us access to the original event via <code>e.originalEvent</code>. So I'd try:</p> <pre><code>function HandleDropEvent(e){ var dt = e.dataTransfer || (e.originalEvent &amp;&amp; e.originalEvent.dataTransfer); var files = e.target.files || (dt &amp;&amp; dt.files); if (files) { UploadFile(files[0]); } else { // Perhaps some kind of message here } } </code></pre> <p>That grabs <code>files</code> from <code>e.target</code> if that's where it is, or from the <code>dataTransfer</code> object wherever we find it (on <code>e</code>, or on <code>e.originalEvent</code>).</p>
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    1. POJavaScript/HTML5/jQuery Drag-And-Drop Upload - "Uncaught TypeError: Cannot read property 'files' of undefined"
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    1. COI **know** the files object exists, it's just that I think that Chrome isn't passing it to the function.
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    2. CO@Joe: My point was that your code is dereferencing `undefined`, which is why you get the error. I've added a thought: I suspect you're looking for `e.originalEvent.dataTransfer.files`.
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    3. COThat has worked excellently; Thank you!!!
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