<!DOCTYPE html>
<html>
<body>
<p>Press a key on the keyboard in the input field to get the Unicode character code of the pressed key.</p>
<input type="text" size="40" onkeypress="myFunction(event)">
<p id="demo"></p>
<p><strong>Note:</strong> The which property is not supported in IE8 and earlier versions.</p>
<script>
function myFunction(event) {
var x = event.which;
document.getElementById("demo").innerHTML = "The Unicode value is: " + x;
}
</script>
</body>
</html>