We can able to detect the Caps lock key is ON/OFF using Jquery. My question is

"can we possible to Turn ON/OFF the Caps lock key using Jquery or Javascript in Keypress event".

And also using C#, How to achieve this?

Thanks in advance !!!

We can able to detect the Caps lock key is ON/OFF using Jquery. My question is

"can we possible to Turn ON/OFF the Caps lock key using Jquery or Javascript in Keypress event".

And also using C#, How to achieve this?

Thanks in advance !!!

• c#
• javascript
• jquery

• 2 Nope. Javascript cannot interfere with the OS like that. – joshley Commented May 10, 2012 at 13:09
• If it can alter with OS then it will be very easy for programmer to make a virus in js which is not possible – user1432124 Commented May 10, 2012 at 13:11

4 Answers 4

You can't change whether the caps lock key is on or off. You can however change whether your input strings are lower or upper case with Javascript based on whether the caps lock key is on or off.

for (char in inputString) {
    if(capslock) { // do your caps lock detection here
        if(char === char.toUpperCase()) { // it's upper case
            char = char.toLowerCase();
        } else {
            char = char.toUpperCase();
        }
    }
}

You can't do this jquery like javascript will be sandboxed inside the browser.

Detection only:

$('#id').keypress(function(e) { 
    var s = String.fromCharCode( e.which );
    if ( s.toUpperCase() === s && s.toLowerCase() !== s && !e.shiftKey ) {
        alert('caps is on');
    }
});

If this would be possible, then I would be able to control user's sound volume, or maybe check what he have in hard disk, I may be more curious and spy his network card traffic...
I would own the world with a simple JavaScript file :)