<!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>
<script>
/* In this example, we use a cross-browser solution, because the keyCode property does not work on the onkeypress event in Firefox. However, the which property does.
Explanation of the first line in the function below: if the browser supports event.which, then use event.which, otherwise use event.keyCode */
function myFunction(event) {
var x = event.which || event.keyCode;
document.getElementById("demo").innerHTML = "The Unicode value is: " + x;
}
</script>
</body>
</html>