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Capture ESCAPE and Function keys in Firefox with Javascript

Posted on 2009-05-06
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Last Modified: 2013-12-07
Hi,

I am attempting to write a web app that uses key presses for different things. I wish to be able to use the Escape key and Function in Javascript to call a funtion, and can in Internet Explorer and Google Chrome (not all function keys, but F6 onwards, which is enough), but can't in Firefox.

Now, what I am using it for will be only used on a certain number of computers, each of which I am able to modify settings on, so I am trying to find a way that I can either alter a Firefox setting, or install an extension, that will allow Javascript to use the Escape Key and the Function Keys (and possibly disable some of the default browser action of some of these, such as F3 which is search page).

The code that I have attached is what I am using to capture keys currently (goes in the <head> tag), and will capture F8. Also, this is simply copied and pasted code, but if there is a better way to capture the key (which I am sure there is), that would also be appreciated).
<script>
document.onkeydown = function getcode(ev) {
 
value = (window.external) ? event.keyCode : ev.keyCode;
 
//tells you the code of the button which was pressed
//F5 = 116, F8 = 119
 
if (window.external) {
		if (event.keyCode == 119 || value == 119) {
			alert("You pressed F8");
		}
	} else {
		if (ev.keyCode == 119 || value == 119) {
			alert("You pressed F8");
		}
	}
}
</script>

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Question by:dh-s
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7 Comments
 
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Expert Comment

by:Haris V
ID: 24313543
please check this link,

1. http://www.cambiaresearch.com/c4/702b8cd1-e5b0-42e6-83ac-25f0306e3e25/Javascript-Char-Codes-Key-Codes.aspx

and


<html>

<head>

<script>
      function keypress()
      {
            if(event.keyCode == 27){ // Capture Esc key
                                            window.close();
            }
      }
</script>

</head>

<body onkeyup="keypress()">

</body>

</html>

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LVL 10

Expert Comment

by:bugada
ID: 24313837
To be crossbrowser you need to modify your function as follow

<script>
      function keypress(e)
      {
         e = e || window.event;
         var keyCode = e.which || e.keyCode; 
         if(keyCode == 27){ // Capture Esc key
             window.close();
         }
      }
</script>

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Author Comment

by:dh-s
ID: 24313905
The script supplied (even the cross browser one) works PERFECT in Internet Explorer, but not Firefox.

I need it to be able to work in Firefox... is there anything that I need to modify in the settings?
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Accepted Solution

by:
bugada earned 125 total points
ID: 24313963
Following modern unobtrusive javascript, you can also write the code like this:
<script>
 
      document.onkeydown = function(e) {
         e = e || window.event;
         var keyCode = e.which || e.keyCode; 
         switch(keyCode) {
            case 27:
              alert("you pressed ESC");
              break;
            case 119:
              alert("you pressed F8");
              break;  
            default:
              alert("you pressed a not handled key: " + keyCode)
         }
      }
</script>

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Expert Comment

by:bugada
ID: 24314012
remember that the code inside the if (window.external) { } block will never be executed by FF or other browser rather than IE.

If you don't need it, remove it, or make an else branch for other browsers.
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Author Comment

by:dh-s
ID: 24314028
Hi, thanks bugada... that is the first code that I have tried that works in Firefox. Thanks.
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Expert Comment

by:bugada
ID: 24314080
glad that helped you.

Another tip: if you want prevent the default action (like reloading the page after a F5 keypress) just add a return false; at the end of the function.
<script>
 
      document.onkeydown = function(e) {
         e = e || window.event;
         var keyCode = e.which || e.keyCode; 
         switch(keyCode) {
            case 27:
              alert("you pressed ESC");
              break;
            case 119:
              alert("you pressed F8");
              break;  
            default:
              alert("you pressed a not handled key: " + keyCode)
         }
         return false; // prevent default behaviour
      }
</script>

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