How to check input file is empty, and also display an alert if png format is selected using jquery

Question

I have got an input file upload , need to check which file is uploaded / if no file is selected by the client using jquery.

Answer 1

Testing for...

$('#file1')[0].files.length == 0

...is working for me in Chrome. The jQuery is actually not even necessary as the raw HTML element (returned by the [0] on the jQuery object) gives access to the files list.