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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript HTML Events</h1>
<h2>The onchange Attribute</h2>
Enter your name: <input type="text" id="fname" onchange="upperCase()">
<p>When you leave the input field, a function transforms the input to upper case.</p>
<script>
  function upperCase() {
    const x = document.getElementById("fname");
    x.value = x.value.toUpperCase();
  }
</script>
</body>
<!-- /js/tryit.asp?filename=tryjs_events_onchange Thu, 06 Feb 2025 19:15:34 GMT -->
</html>