[thelist] Back button issue with QueryString

[Michael Robertson]

thanks for your help. I agree with you guys it is a little ridulous, but
it's my client's request. :-)

----- Original Message -----
From: "Joshua Olson" <joshua at waetech.com>
To: <thelist at lists.evolt.org>
Sent: Thursday, January 23, 2003 10:32 AM
Subject: Re: [thelist] Back button issue with QueryString


> ----- Original Message -----
> From: "Michael Robertson" <mike at mikeemedia.com>
> Sent: Thursday, January 23, 2003 9:59 AM
>
>
> > Basically this part of the QueryString  "?msg=23" tells the server to
call
> a
> > sub that pulls the corresponding message from a database and displays it
> in
> > the browser. That is working fine.
> >
> > The problem is if follow I link to another page and decide I want to go
> back
> > and hit the back button, the browser history calls
> > MyPage.asp?msg=23 and displays the message again which in most case is
not
> > appropriate anymore.
> >
> > So I'm wondering if there is a way to eliminate that problem.
>
> Here's a completely ridiculously complex way to deal with this:
>
> 1.  Change the display code so that the error message is generated via JS
> using document.write instead of being inserted into the HTML directly.
>
> 2.  Set a cookie indicating that the message has already been displayed.
>
> 3.  Check for this cookie prior to actually calling the document.write.
If
> the cookie exists, do not display the text.
>
> This technique could work, but opens up a vast array of cans of worms.
>
> Here's another technique:
>
> Use session variables to make sure that the message is only displayed
once.
>
> This would not work too well if the file came directly out of the users
> cache instead of being reloaded from the server.  Adding the appropriate
> headers to force the page to not be cached may help in this case.
>
>
>
> In a nutshell, what you are trying to do is basically impossible without
JS.
> With JS, you could also use the location.replace function to make it so
that
> the page that is concerning you get overwritten with the following page.
>
>
> I have other ideas too... ask if you need them.
>
> HTH,
>
> -joshua
>
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