Allow only pdf, doc, docx format for file upload?

Question

I am triggering a file upload on href click.
I am trying to block all extension except doc, docx and pdf.
I am not getting the correct alert value.

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Answer 1

Better to use change event on input field.

Updated source:

var myfile="";

$('#resume_link').click(function( e ) {
    e.preventDefault();
    $('#resume').trigger('click');
});

$('#resume').on( 'change', function() {
   myfile= $( this ).val();
   var ext = myfile.split('.').pop();
   if(ext=="pdf" || ext=="docx" || ext=="doc"){
       alert(ext);
   } else{
       alert(ext);
   }
});

Updated jsFiddle.