To determine the actual character, you should use the keypress event instead of keydown. While keydown provides you with a key code, keypress indicates the character which was entered by the user.
Another difference is that when the user presses and holds a key, a keydown event is triggered only once, but separate keypress events are triggered for each inserted character.
Here's an example of using the keypress event:
<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; // charCode will contain the code of the character inputted
var theChar = String.fromCharCode(charCode); // theChar will contain the actual character
});
</script>
</body>
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