How can the file extension be validated in an input type file using JQuery?

Question

HTML:

Rule: The file to

Answer 1

The following gets the extension of the file:

JS:

$('#group_documents_file').change(function(){
    var value = this.value;
    val = value.split("\\");
    var file = (val[val.length - 1]).split('.');
    var ext = file[file.length - 1];
    alert(ext);
})

Fiddle: http://jsfiddle.net/maniator/gveqX/