Untitled

<html>

  term:
   <input  id='term'   />

   <hr />

    files:
    <input multiple type='file'  onchange="grepFiles(this.files)" />

    <hr />  <hr />

  results:<br />
    <textarea rows='10' cols='80' id='output'></textarea>

<script type='text/javascript'>

       function el(tid) {return document.getElementById(tid);}

	function grepFiles(r){
		var term=el("term").value;
		el("output").value=[].slice.call(r).filter(function(a){
			var val=a.getAsBinary()+"";
			return val.indexOf(term) > -1;
		}).map(function(a){
			return a.fileName;
		}).join("\n\n")
	}

</script>
</html>