File: keyListener.html

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<!DOCTYPE html>
<html>
<body>

<p>A function is triggered when the user is pressing a key in the input field.</p>

<form action="/">
<input id="k" type="text">
<input type="submit">
</form>
<script>
function myFunction(event)
{
  window.alert("You pressed a key with code " + event.keyCode + " inside the input field");
}

document.getElementById('k').addEventListener('keydown', myFunction);
</script>
</body>
</html>