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The XMLHttpRequest Level 2 standard (still a working draft) defines the FormData interface. This interface enables appending File objects to XHR-requests (Ajax-requests). Btw, this is a new feature - in the past, the "hidden-iframe-trick" was used (read about that in my other question ). This is how it works (example): var xhr = new XMLHttpRequest(), fd = new FormData(); fd.append( 'file', input.files[0] ); xhr.open( 'POST', 'http://example.com/script.php', true ); xhr.onreadystatechange = handler; xhr.send( fd ); where input is a <input type="file"> field, and handler is the success-handler for the Ajax-request. This works beautifully in all browsers (again, except IE). Now, I would like to make this functionality work with jQuery. I tried this: var fd = new FormData(); fd.append( 'file', input.files[0] ); $.post( 'http://example.com/script.php', fd, handler ); Unfortunately, that won't w