<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {
var x = document.getElementById("fname");
x.value = x.value.toUpperCase();
}
</script>
</head>
<body>
<p>A function is triggered when the user releases a key in the input field. The function transforms the character to upper case.</p>
Enter your name: <input type="text" id="fname" onkeyup="myFunction()">
</body>
</html>