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    <p>You cannot rely on <code>file.type</code>. A file without an extension will have a type of <code>""</code>. Save a text file with a <code>.jpg</code> extension and load it into a file control, and its type will display as <code>image/jpeg</code>. And, a folder named "someFolder.jpg" will also have its type as <code>image/jpeg</code>.</p> <p>Try to read the file with a <code>FileReader</code>. If a directory is dragged in, the <code>FileReader</code> will raise the <code>error</code> event:</p> <pre><code>var reader = new FileReader(); reader.onload = function (e) { // it's a file }; reader.onerror = function (e) { // it's a directory }; reader.readAsText(file); </code></pre> <p>Happily, in IE11, when a directory is dropped, the <code>e.dataTransfer.files</code> collection is empty.</p> <p>Chrome exposes an additional property in <code>e.dataTransfer</code> called <code>items</code> containing a collection of <code>DataTransferItem</code> objects. On each of these objects, you can call <code>item.webkitGetAsEntry()</code>, which returns an <code>Entry</code> object. The <code>Entry</code> object has properties <code>isDirectory</code> and <code>isFile</code>:</p> <pre><code>// Chrome only if (e.dataTransfer.items &amp;&amp; e.dataTransfer.items.length) { [].forEach.call(e.dataTransfer.items, function(item) { var entry = item.webkitGetAsEntry(); if (entry &amp;&amp; entry.isFile) { var file = item.getAsFile(); // same as object in e.dataTransfer.files[] // do something with the file } } } </code></pre> <p>Interestingly, in my experimentation, every folder I've looked at has had its <code>File.size % 4096</code> as zero. However, of course, some files will have that as well. <code>File.size</code> is not a reliable indicator of whether a file is actually a folder.</p>
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    1. COThanks for the suggestion - I was wondering if rejecting zero sized files would be a good starting point (this seems to be the size of folders on Windows) and then using FileReader to check if the contents is \0 when File.size % 4096 is zero
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    2. COAbsolutely. The most surprising discovery for me was that size was not consistently 0 for folders. The `% 4096` thing is interesting. Certainly, more research is called for. Like, is 4096 universal, or is it specific to 64 bit Windows 7?
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    3. COOdd - I was getting size 0 consistently with Win 7 (64bit) (will double-check, but tried with Chrome/Firefox). However, I was getting 4096 bytes (exactly) with Ubuntu 11.10 (64bit) (again with Chrome/Firefox).
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