To determine the actual character, you should use keypress instead keydown. While it keydownprovides you with key code, keypressindicates the character that was entered by the user.
, , keydown , keypress.
keypress:
<body>
<form>
<input id="target" type="text" />
</form>
<script src="http://api.jquery.com/scripts/events.js"></script>
<script>
$("#target").keypress(function(event) {
var charCode = event.which;
var theChar = String.fromCharCode(charCode);
});
</script>
</body>