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Preventing F5 from reloading the page.

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LFI

LFI

Programmer
Apr 27, 1999
1,996
US
Hey, all.

I seem to be able to catch F5 when it's pressed (calling a function using the BODY tag's onkeydown event and checking for a keyCode of 116), but I still can't seem to prevent the page from reloading.

This is all I've tried so far:

Code: 
<html>
<head>
<script>
function rejectF5()
{
 if(event.keyCode == 116)
  return false;
}
</script>
</head>
<body onkeydown='return rejectF5();'>
<script>
document.write(new Date()); [b]//I use this to see if page reloads.[/b]
</script>
</body>
</html>

Is it (what I want to do) do-able?

Thanks.

--Dave
 
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Hey Dave,
(just so that you know), what makes Jeff's code stop the postback is the "return false"; line at the end of the function. Thus, whenever you have a situation where a postback occurs and you want to stop it (such as clicking a button), simply say return false right after it, and that will do the trick. Take a look at this:
Code: 
btn.Attributes.Add("onclick", 
   "someFunc(); [b]return false;[/b]);
JC


Friends are angels who lift us to our feet when our wings have trouble remembering how to fly...
 
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JC,

In this case, it was a keyboard key that was posting back. I don't think I can add an attribute to that.

I did have a 'return false' on my first attempt. The line that made it work for me is changing the keyCode to 0 so that when postback happened, the direction was to do nothing. If I comment out the 'return false,' it stops working again, so both lines are needed here.

This is what I ended up with (for a test):

Code: 
<html>
<head>
<script>
function rejectF5()
{
 if(event.keyCode == 116)
 {
  event.keyCode = 0;
  return false;
 }
}
</script>
</head>
<body onkeydown='return rejectF5();'>
<script>
document.write(new Date());
</script>
</body>
</html>

Thanks for your post.

--Dave
 
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Dave,
I didn't mean you could add attributes to the keyboard event. I meant that return false stops a postback. I didn't know you needed to change the keyCode to 0 in this case, though, so thanks for clearing that up!

JC

Friends are angels who lift us to our feet when our wings have trouble remembering how to fly...
 
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Would using:

Code: 
event.cancelBubble = true;

work instead of assinging 0 to event.keyCode?

Just a theory ;o)

Dan
 
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Dan,

I just tried it. It did not work. Thanks for the suggestion though!

The solution to change the keyCode is IE-specific (according to Jeff's original post at the other end of the link, above, anyway) and that's not a problem for me where I work, but I would be interested in a multi-browser-compatible solution.

--Dave
 
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There are so many ways of refreshing a page...

You'd have to stop right-click (so the user couldn't refresh using the menu), and open in a menuless window, so the user couldn't click "View" then "Refresh".

Too many things to trap ;o(

Dan
 
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Jeff, Dan...

You guys are right. I was actually asking the question for a co-worker. He began seeking an alternate route to his problem anyway, but once I "figured out" how to "disable" F5, he seemed to consider going back to that.

I'll remind him of all these other methods of refreshing the page.

Thanks!

--Dave
 
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