for csv files (.csv), use:
<input type="file" accept=".csv" />
For Excel Files 2003-2007 (.xls), use:
<input type="file" accept="application/vnd.ms-excel" />
For Excel Files 2010 (.xlsx), use:
<input type="file" accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" />
For Text Files (.txt) use:
<input type="file" accept="text/plain" />
For Image Files (.png/.jpg/etc), use:
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<input type="file" accept="image/*" />
For HTML Files (.htm,.html), use:
<input type="file" accept="text/html" />
For Video Files (.avi, .mpg, .mpeg, .mp4), use:
<input type="file" accept="video/*" />
For Audio Files (.mp3, .wav, etc), use:
<input type="file" accept="audio/*" />
For PDF Files, use:
<input type="file" accept=".pdf" />
DEMO:
http://jsfiddle.net/dirtyd77/LzLcZ/144/
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