How do I make an Capslock Validator?

How do I make an action to detect if the capslock key is activated or no? Thanks in advance.

Thats real a problem. Javascript so also construct can only check capslock, when you press another key.

Because it only can check keycodes.

This would be look like this in javascript, you see you cant directly:

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