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Detecting browser refresh

Posted on 2000-04-13
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Last Modified: 2008-02-01
Is there any way to detect if the user has pressed the refresh button on the browser? The reason why I'm asking this is I'm trying to prevent an ASP script from re-running when the user presses the Refresh button (I know it sounds stupid, but someone out there is likely to do it!)
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Question by:iukpo
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djbusychild earned 300 total points
ID: 2714246
well, the irony is that you want to detect browser refresh using javascript to prevent ASP from reexecuting?
what are you gonna do? write to the from javascript cookie or soemthing?

you can detect refresh by waiting for an onunload event. That event will also fire when the user leaves the page, but if you're only concern is to mark the page so that it won't reexecute, than it make perfect sense, since if the user goes somewhere else and comes back the page shouldn't refresh, right?
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Expert Comment

by:chandlermcc
ID: 2714286
you could use a session object on the server side to track this sort of thing. the session wouldnt expire until the client closes the browser or it times out. refreshing the browser wouldnt effect the session
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Expert Comment

by:chandlermcc
ID: 2714314
you could use a session object on the server side to track this sort of thing. the session wouldnt expire until the client closes the browser or it times out. refreshing the browser wouldnt effect the session
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by:djbusychild
ID: 2714581
chandlermcc, imagine keeping all those in a session object on a website that has 100 pages and 10000 people visit the site and quit the browser without giving the site a chance to explicitly expire the session.... assume the integer stored in the session object is 4byes, that's 400 bytes per use who has seen 100 pages
and that's 4000000 bytes (or about 4MB)... don't you think that's a waste of memory?

the memory won't be able to be reclaimed for a while, either...

what you should rather do is tweak the page expiration so that the page will be loaded from cache rather than from the server
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Expert Comment

by:chandlermcc
ID: 2714612
Yeah, that's why it was a comment and not an answer :) But I do agree with you. Funny, I've never heard anyone say good things about sessions...
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by:djbusychild
ID: 2714627
Actually, I think Sessions are awesome. It's just that it's not all that great to be used here. ;) It's cool to have it to store something small and if kept at a minimum. ^^;
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