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<!DOCTYPE html>
<html>
<body>
​
<p>When you enter the input field (child of FORM), a function is triggered which sets the background color to yellow. When you leave the input field, a function is triggered which removes the background color.</p>
​
<form id="myForm">
  <input type="text" id="myInput">
</form>
​
<script>
var x = document.getElementById("myForm");
x.addEventListener("focus", myFocusFunction, true);
x.addEventListener("blur", myBlurFunction, true);
​
function myFocusFunction() {
  document.getElementById("myInput").style.backgroundColor = "yellow";  
}
​
function myBlurFunction() {
  document.getElementById("myInput").style.backgroundColor = "";  
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_onfocus_eventdelegation by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:02:21 GMT -->
</html>
​
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