jQuery focusin()

Introduction

Set background color of a <div> element when the <div> element or any children elements get focus:

<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>//from  w w w.j av a  2s.  c o  m
<script>
$(document).ready(function(){
  $("div").focusin(function(){
    $(this).css("background-color", "blue");
  });
  $("div").focusout(function(){
    $(this).css("background-color", "yellow");
  });
});
</script>
</head>
<body>

<div style="border: 1px solid black;padding:10px;">
  First name: <input type="text"><br>
  Last name: <input type="text">
</div>

<p>Click an input field to get focus. 
Click outside an input field to lose focus.</p>

</body>
</html>

The focusin event occurs when an element or any children elements gets focus.

The focusin() method runs a function when a focus event occurs on the element, or its children element.

The focusin() method triggers if any child elements get focus.

$(selector).focusin(function)

Parameter	Optional	Description
function	Required.	function to run when the focusin event occurs.

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