Detect key press

<script type="text/javascript">
document.addEventListener('keyup', function(event) {
	document.getElementById("keyno").innerHTML = event.keyCode;
	if(event.keyCode == 13){
		alert("Enter");
	}
});
</script>

Common keycodes

13	Enter
16	Shift
17	Ctrl
49	1
50	2
51	3
52	4
53	5
54	6
55	7
56	8
57	9
107	+ (plus)
109	- (minus)
37	left arrow
39	right arrow
38	up arrow
40	down arrow

Press key to get code:

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(unless other is noted)