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I was wondering if it was possible to know if the caps lock button is active while filling a web form ?

Sometimes, when you are asked to enter your password, softwares notice you that's active, and you be careful.

I would have liked to do the same in web forms.

Any ideas ?

I was wondering if it was possible to know if the caps lock button is active while filling a web form ?

Sometimes, when you are asked to enter your password, softwares notice you that's active, and you be careful.

I would have liked to do the same in web forms.

Any ideas ?

  • javascript
Share Improve this question edited Jun 1, 2009 at 17:53 Boris Guéry asked Jun 1, 2009 at 13:28 Boris GuéryBoris Guéry 47.6k8 gold badges56 silver badges88 bronze badges 1
  • 1 possible duplicate of How do you tell if caps lock is on using JavaScript? – sg3s Commented Aug 27, 2013 at 10:26
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4 Answers 4

Reset to default 1

The following jQuery snippet detects whether caps lock is enabled upon keypress:

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

Taken from StackOverflow answer: https://stackoverflow./a/896515/1113435

try 

<html>
<head>
<script type="text/javascript">
function checar_caps_lock(ev) {
    var e 

    = ev || window.event;
        codigo_tecla = e.keyCode?e.keyCode:e.which;
        tecla_shift = e.shiftKey?e.shiftKey:((codigo_tecla == 16)?true:false);
        if(((codigo_tecla >= 65 && codigo_tecla <= 90) && !tecla_shift) || ((codigo_tecla >= 97 && codigo_tecla <= 122) && tecla_shift)) {
            document.getElementById('aviso_caps_lock').style.visibility = 'visible';
        }
        else {
            document.getElementById('aviso_caps_lock').style.visibility = 'hidden';
        }
    }
    </script>
    </head>
    <body>
    <form>
    <input name="nome_do_campo" type="text" onkeypress="checar_caps_lock(event)" />
    <div id="aviso_caps_lock" style="visibility: hidden">CAPS LOCK ATIVADO</div>
    </form>

</body>
</html>

It is interesting that this only works with keypress and not with keyup and keydown. Just to know, this:

$("#example").keypress(function(e) {
    console.log("keypress: " + e.which);
});
$("#example").keydown(function(e) {
    console.log("keydown: " + e.which);
});
$("#example").keyup(function(e) {
    console.log("keyup: " + e.which);
});

("a" pressed) returns this:

keydown: 65
keypress: 97
keyup: 65

Note: tried with chrome and firefox

Accessing user setting like that would be against any decent security model, however you could check for whether the user has entered ALL_CAPS or aLL_CAPS and warn appropriately.

An elegant work-around can be found here: http://24ways/2007/capturing-caps-lock

Sadly, there’s no way of actually detecting whether Caps Lock is on directly. However, there’s a simple work-around; if the user presses a key, and it’s a capital letter, and they don’t have the Shift key depressed, why then they must have Caps Lock on! Simple.

本文标签： javascriptIs it possible to check if the caps lock button is active while typing in formStack Overflow

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