The JavaScript Source: Forms : Check Cap Locks

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If a user enters his password in a Web-based form with [Caps Lock] accidentally on, he can become frustrated because his password is not being accepted, and may assume the script is the source of the problem. This script will let the user know his [Caps Lock] is on and about the potential for error.

Notes

Created by: John G. Wang
Web Site: http://www.csua.berkeley.edu/~jgwang/
Posted: March 6, 2002

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: checkCapLocks.js

/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: John G. Wang | http://www.csua.berkeley.edu/~jgwang/ */

function checkCapsLock( e ) {
	var myKeyCode=0;
	var myShiftKey=false;
	var myMsg='Caps Lock is On.\n\nTo prevent entering your password incorrectly,\nyou should press Caps Lock to turn it off.';

	// Internet Explorer 4+
	if ( document.all ) {
		myKeyCode=e.keyCode;
		myShiftKey=e.shiftKey;

	// Netscape 4
	} else if ( document.layers ) {
		myKeyCode=e.which;
		myShiftKey=( myKeyCode == 16 ) ? true : false;

	// Netscape 6
	} else if ( document.getElementById ) {
		myKeyCode=e.which;
		myShiftKey=( myKeyCode == 16 ) ? true : false;

	}

	// Upper case letters are seen without depressing the Shift key, therefore Caps Lock is on
	if ( ( myKeyCode >= 65 && myKeyCode <= 90 ) && !myShiftKey ) {
		alert( myMsg );

	// Lower case letters are seen while depressing the Shift key, therefore Caps Lock is on
	} else if ( ( myKeyCode >= 97 && myKeyCode <= 122 ) && myShiftKey ) {
		alert( myMsg );

	}
}

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="checkCapLocks.js"></script>

Body

Paste this code into the BODY section of your HTML document


<form>
<strong>Password:</strong>
<input type="Password" name="Password" size="16" maxlength="16" onkeypress="checkCapsLock( event )">
<p>
<input type="Reset">
</form>

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User Comments

3. From: Pabitra Bajracharya
06/12/2008 05:49:32

1. From: Paul Brown
Caps Lock Script doesn't work
02/26/2008 02:44:56

2. From: Lee (Admin)
06/26/2008 11:21:50

Navigation Menu

Internet.commerce

Internet.com

Developer Channel

Great Sites

Promotions

General

Notes

Source Code

External file

Head

Body

User Comments

3. From: Pabitra Bajracharya06/12/2008 05:49:32

1. From: Paul BrownCaps Lock Script doesn't work02/26/2008 02:44:56

2. From: Lee (Admin)06/26/2008 11:21:50

3. From: Pabitra Bajracharya
06/12/2008 05:49:32

1. From: Paul Brown
Caps Lock Script doesn't work
02/26/2008 02:44:56

2. From: Lee (Admin)
06/26/2008 11:21:50