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javascriptdom-eventsgreasemonkeykeypress

Greasemonkey Javascript Key Press

I'm currently trying to make a GreaseMonkey script that will allow a user to press left or right on their keyboard and have that go to a previous comic strip or go to the next strip. I currently have some code up but it's not giving me any results.

function KeyCheck()
{
var KeyID = event.keyCode;
alert(KeyID);
}

document.onKeyDown = KeyCheck();

The code is just for debugging to see if it's actually executing but when I press a key nothing will happen on the page. I'm testing in Firefox also.

Solution

  • So after Googling for a good 30 minutes, I found out GreaseMonkey doesn't support onkeydown out of the box. I had to use a function called "addEventListener". My final code returns the keyCode of a key pressed on the site properly:

    function KeyCheck(e)
{
alert(e.keyCode);
}

window.addEventListener('keydown', KeyCheck, true);