jQuery focusout()

Introduction

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

<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>//w w w .j  a  v  a  2 s  . 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 focusout event occurs when an element or its children element loses focus.

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

The focusout() method triggers if any child elements lose focus.

$(selector).focusout(function)

Parameter	Optional	Description
function	Optional.	the function to run when the focusout event occurs

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