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<html>
<body>
<script language="JavaScript">
function onLoad() {
    console.log(document.getElementById("test"));
    document.getElementById("test").onkeydown = function(event) {
                console.log("Code: "+event.keyCode+"; Key: "+String.fromCharCode(event.keyCode));
        }
}
</script>
<body onLoad="onLoad();">
    <input id="test">
</body>
</html>

document.onkeypress = function(evt) {
    evt = evt || window.event;
    var charCode = evt.which || evt.keyCode;
    var charTyped = String.fromCharCode(charCode);
    alert("Character typed: " + charTyped);
};