jQuery keydown()

Introduction

Set the background color of an <input> field when a keyboard key is pressed down:

<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>/*from  www  . ja  v  a  2 s. c  o  m*/
<script>
$(document).ready(function(){
  $("input").keydown(function(){
    $("input").css("background-color", "yellow");
  });
  $("input").keyup(function(){
    $("input").css("background-color", "pink");
  });
});
</script>
</head>
<body>

Enter your name: <input type="text">

<p>Enter your name in the input field above. 
It will change background color on keydown and keyup.</p>

</body>
</html>

The keydown event occurs when a keyboard key is pressed down.

The keydown() method triggers the keydown event.

The keydown() method can run a function when a keydown event occurs.

We can use the event.which property to return which keyboard key was pressed.

Trigger the keydown event for the selected elements:

$(selector).keydown()

Attach a function to the keydown event:

$(selector).keydown(function)

Parameter	Optional	Description
function	Optional.	function to run when the keydown event is triggered

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