capture event when ctrl key is pressed

#1 July 20th, 2005, 12:52 PM

Hello,
I want to capture the event when the <ctrl> key is pressed.

How can I do that ?

Thanks :)

#2 July 20th, 2005, 12:52 PM

"Mr. x" wrote on 14/11/2003:
[color=blue]
> Hello,
> I want to capture the event when the <ctrl> key is pressed.
>
> How can I do that ?[/color]

This is under IE 6 (I don't have any other browsers, so someone else
will have to chip in).

A onkeydown event is fired when the CTRL key is pressed, but the
event.which and event.modifiers properties are undefined (even when a
letter key is pressed). This means that there is no reliable way to
detect it. The onkeypress event doesn't work with modifier keys
(ctrl, alt, shift, etc).

Do Mac keyboards even have CTRL keys?

Mike

--
Michael Winter
M.Winter@[no-spam]blueyonder.co.uk (remove [no-spam] to reply)

#3 July 20th, 2005, 12:53 PM

Michael Winter hu kiteb:
[color=blue]
> "Mr. x" wrote on 14/11/2003:
>[color=green]
>> Hello,
>> I want to capture the event when the <ctrl> key is pressed.
>>
>> How can I do that ?[/color]
>
> This is under IE 6 (I don't have any other browsers, so someone else
> will have to chip in).
>
> A onkeydown event is fired when the CTRL key is pressed, but the
> event.which and event.modifiers properties are undefined (even when a
> letter key is pressed). This means that there is no reliable way to
> detect it. The onkeypress event doesn't work with modifier keys
> (ctrl, alt, shift, etc).[/color]

Both navigator 7 and explorer 6 can detect the onkeyup event, and do
recognise the control key. onkeydown and onkeypress may also be
supported. However, control+[key] combo keystrokes are rather more
difficult to detect. I haven't tried.

--
--
Fabian
Visit my website often and for long periods!
http://www.lajzar.co.uk

ckohtz · #4 May 4th, 2006, 06:07 PM

This works completely in Mozilla (ns), have problems in IE when only using the ev.ctrlKey && ev.keyCode, it's like it won't capture the ctrl unless the shift or alt key are pressed too. Annoying!

Expand|Select|Wrap|Line Numbers

 var captureKeys = function(ev) {

    ev = ev || window.event;             // gets the event in ie or ns

    kCode = ev.keyCode || ev.which;   // gets the keycode in ie or ns
 
    /* in ie, when pressing the ctrl + shift + key, it gives the key code for the capitalized key (probably because shift is pressed) 

       in ns pressing ctrl, shift and another key doesn't change the keycode

       thus, the || and two different numbers */
 
    if (ev.ctrlKey && ev.shiftKey && kCode == 19 || ev.ctrlKey && ev.shiftKey && kCode == 83) {    // ctrl+alt+s

                saveFunction() // another function that does something

        return false;  // make it so the browser ignores key combo

    }

    if (ev.ctrlKey && kCode == 119) { // ctrl+w

        closeWin();  // run your own script to close the window 

                                 // doesn't work in ie, ie just closes the window

        return false;

    }

}

and then put this in the body tag...

onload="document.onkeypress=captureKeys;"

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