<!DOCTYPE html>
<html>
<body>
<p>This example uses the HTML DOM to assign an "oninput" event to an input element.</p>
<p>Write something in the text field to trigger a function.</p>
Enter name: <input type="text" id="myInput" value="Mickey">
<script>
document.getElementById("myInput").oninput = function() {myFunction()};
function myFunction() {
alert("The value of the input field was changed.");
}
</script>
</body>
</html>