ADF 10G : How to disable CTRL + Combination key ?

Question

Dear all,
I developed ADF application using ADF 10.1.3 and have the requirement to prevent user from press the ctrl+ key ( like ctrl + p ) .
Firstly , I used JavaScript to disable this function and it worked on IE and Chrome but not on Firefox.
Actually, it work on firefox only the first time that user press ctrl key but when user press it again without reloading page , it is not worked.
This is JavaScript that I used
function disableCtrlKeyCombination(e)
            var isCtrl;
            if(window.event)
                //IE
                 if(window.event.ctrlKey)
                    isCtrl = true;
                 else
                    isCtrl = false;
            else{
                //firefox
                if(e.ctrlKey)
                     isCtrl = true;
                else
                     isCtrl = false;
            //if ctrl is pressed return false to disable
            if(isCtrl){
               alert('Key CTRL has been disabled.');
               return false;
            return true;
        }and I call this javaScript function with this code.
<af:document title="test" id="document1"
                    onkeydown="disableCtrlKeyCombination(event)"
                    onkeypress="disableCtrlKeyCombination(event)">So, I think there are other way that we can do with this problem or I have to modify coding to support this functionality on FireFox Browser.
Regards,
zenoni

Answer 1

Thank Frank and John,
I tried to follow the instruction that you give me but result still be the same.
I think the problem is not involve with javaScript because I can detect CTRL at the first time but the problem will occur in 2 cases.
1 . It will occurs when user press ctrl button for the second time after we close alert box .
2. when the page still shows alert message and user tried to press ctrl button ( ctrl+n and it worked)
So, I think Firefox have some background process that monitor user input or have some thing .
Regards,
zenoni