Get Correct keyCode for keypad(numpad) keys

Use the keypress handler:

[somelement].onkeypress = function(e){
  e = e || event;
  console.log(String.fromCharCode(e.keyCode));
}

See also: this W3C testdocument

if you want to use the keyup or keydown handler, you can subtract 48 from e.keyCode to get the number (so String.fromCharCode(e.keyCode-48))