<html>
<head>
<script>
function myFunction()
{
var x=document.getElementById("fname");
x.value=x.value.toUpperCase();
}
</script>
</head>
<body>
Enter your name: <input type="text" id="fname" onblur="myFunction()">
<p>When you leave the input field, a function is triggered which transforms the input text to upper case.</p>
</body>
</html>