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Show alert when back button is pressed

Posted on 2006-11-22
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Last Modified: 2011-10-03
Hi all,

how can I show a message box when the back button is pressed?

Thanks
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Question by:zattz
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9 Comments
 
LVL 3

Expert Comment

by:viveksg
ID: 18001013
<script>
 window.close = function(){alert("your message");}
</script>
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LVL 6

Expert Comment

by:aescnt
ID: 18001050
Don't you mean window.onunload?
Although, even clicking a link or going forward will make the event fire.
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Author Comment

by:zattz
ID: 18001057
Dosn't work
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LVL 6

Accepted Solution

by:
aescnt earned 250 total points
ID: 18001073
<html>
<head>
<script type="text/javascript">
window.onunload = function() { alert("You navigated out of the page."); }
</script>
</head>
<body>Try hitting the back button or something.</body>
</html>

IE and Firefox tested.
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LVL 51

Expert Comment

by:ahoffmann
ID: 18001339
> .. show a message box when the back button is pressed?
impossible (except patching the browser)
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LVL 75

Assisted Solution

by:Michel Plungjan
Michel Plungjan earned 250 total points
ID: 18001352
As you said yourself:
"Try hitting the back button or something" where "something" is also "clicking a link or going forward"

This is such a FAQ.

zattz, please tell us why you need this functionality and perhaps we can give you a solution that does no require this alert.

For example to not HAVE a page to go back to, you can have a link on the page before:
<a href="page2.html" onClick="location.replace(this.href); return false">Replace this page with page 2</a>

Also you can do some things with framesets to avoid the alert to be triggered when moving back, and you can use this to stop links from triggering:

<body onLoad="leaving=false" onUnload="if (leaving) alert('Sorry to see you go')">
<a href="http://www.google.com/search?q=back+button+javascript" onClick="leaving=true">Leave for Google</a>
<a href="page2.html" >Staying on the site</a>
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LVL 51

Expert Comment

by:ahoffmann
ID: 18002598
window.onunload() does not work if you navigate with the browser's back button from http://..../this#that to http://..../this

Hence this is not a working answer if you read the question verbatim.
Just my 2 pence ...
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LVL 6

Expert Comment

by:aescnt
ID: 18002625
Hehe, yep... it's really not the fix for that. In fact, onunload is a very unreliable way to detect back navigations, I admit.
If you want to detect back navigations from this.htm#that to this.htm, I'd put a timer that checks window.location.hash -- I believe this method is being used by a few Flash-based websites to detect back button clicks.
0
 

Author Comment

by:zattz
ID: 18002652
Hmm..

that window.location.hash is interesting,

but anyway the onunload is good enough for the page I want it on.

thanks guys
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