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

This demo works in IE9 + Chrome:

http://jsfiddle.net/brdFq/

using Jquery, you get the val();

a quick implementation here:

function hasFile(selector){
    //if there is a value, return true, else: false;
    return $(selector).val()? true: false;
}