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<!DOCTYPE html>
<html>
<body>
​
<p>This example uses the addEventListener() method to attach a "focusin" event to an input element.</p>
​
Enter your name: <input type="text" id="fname">
​
<script>
document.getElementById("fname").addEventListener("focusin", myFunction);
​
function myFunction() {
  document.getElementById("fname").style.backgroundColor = "red";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_onfocusin_addeventlistener by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:02:56 GMT -->
</html>
​
​
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