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jQuery Events: Test if an input has focus

jQuery Events : Exercise - 19 with Solution

Test if an input has focus?

HTML code:

<body>
<div id="content">
<input tabIndex="1">
<select tabIndex="3">
    <option>select menu</option>
	</select>
	 <p tabIndex="3">
	 A Paragraph
	 </div>
   </div>
 </body>

CSS Code for focused color :

  <style>
 .focused {
   background: green;
    }
 </style>
 

Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
   <style>
  .focused {
    background: green;
  }
  </style>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
  <meta charset="utf-8">
  <title>Test if an input has focus</title>
</head>
<body>
<div id="content">
  <input tabIndex="1">
  <select tabIndex="3">
    <option>select menu</option>
  </select>
  <p tabIndex="3">
    A Paragraph
  </div>
</div>
</body>
</html>

JavaScript Code:


$( "#content" ).delegate( "*", "focus blur", function() {
  var elem = $( this );
  setTimeout(function() {
    elem.toggleClass( "focused", elem.is( ":focus" ) );
  }, 0 );
});

Live Demo:

See the Pen jquery-events-exercise-19 by w3resource (@w3resource) on CodePen.


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Previous: Set the focus to the first input box.
Next: Set background color of an element when the element (or any elements inside it) gets focus or loses focus.

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