How can I tell if an event comes from right Ctrl key?

Question

I have an event listener in Javascript, I can tell whether a key event is Ctrl (e.keyCode == 17), but how can I know this Ctrl comes from the right one or left

Answer 1

MSIE provides a ctrlLeftproperty on most events. The property values are:

• true if the left key was pressed during the event
• false if the left key was not pressed.

You can combine event.ctrlKey and event.ctrlLeft to determine if the right Ctrl key was pressed:

if (event.ctrlKey) {
    if (event.ctrlLeft) {
        // left Ctrl key pressed
    } else {
        // right Ctrl key pressed
    }
} else {
    // no Ctrl key pressed
}

Note that the ctrlLeftproperty in a keyup is undefined because the Ctrl key is not pressed anymore.

Tested under MSIE7 and MSIE9. Does not work under Firefox.

See http://help.dottoro.com/ljqlvhuf.php for details.