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matted
Smarty Rookie
Joined: 18 Apr 2004
Posts: 14
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 Posted: Wed Apr 28, 2004 2:25 pm Post subject: Posting (without "contains POSTDATA message) |
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I realize this is not a smarty question, per se, but since I can't find a solution anywhere else, but LOTS of web posts asking about it, I figured I'd try you Smarty veterans and see if anyone has a solution. Please bear in mind I am new to much of this sort of programming, so my stupid factor is large.
The problem:
In mozilla 1.4+, and some other browsers, I'm told, when you try to reload a page with a form, or go back to an immediately previous page that contained a form, you get a message like this:
| Code: | | The page you are trying to view contains POSTDATA. If you resend the data, any action the form carried out (such as search.. ) will be repeated. To resend the data, click OK. Otherwise, click Cancel/ |
I assume this is why most bulletin boards, such as this one, alway go to an intermediate report page that lets the user either navigate back to the previous page, or go somewhere else (like the forum index).
Is there ANY way to avoid this annoying message, without that intermediate page? I've asked some pretty knowledgable programmers, and they just shrug and say "don't use mozilla." That solution is not sufficient. Since I have seen sites where it does not happen, there MUST be a way to prevent it.
Solutions welcome? |
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matted
Smarty Rookie
Joined: 18 Apr 2004
Posts: 14
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| Posted: Wed Apr 28, 2004 2:31 pm Post subject: Update on problem and possible solution |
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Ok.. I just tried some new google words, and found this at
http://www.planetsaturn.pwp.blueyonder.co.uk/backbutton/#Duplicate
| Quote: | Duplicate submissions will occur when users refresh an expired POST request, ignoring the browser's warnings, or you have made an incorrect choice of GET request (which the browser assumes to be an 'idempotent' read-only request).
The solution: include a unique identifier or data timestamp in a hidden field on every form. Record the last identifier issued to a given user in a session variable. Warn the user politely when you find a duplicate identifier, or if the data timestamp is inconsistent with the current timestamp. For example; "A duplicate request cannot be accepted, your data has already been processed. Please click here to return to the menu, and try again". |
I grasp this conceptually, but can someone show me some code that will actually do this (or some other solution?) |
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matted
Smarty Rookie
Joined: 18 Apr 2004
Posts: 14
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| Posted: Wed Apr 28, 2004 2:54 pm Post subject: Update 2 (disabling submit. Only a partial solution) |
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This is ok, if you want to prevent a duplicate and tell the user you are. But doesnt just prevent the message if the user simply pages back or reloads.
http://www.ewebarchitecture.com/tip.php?id=218 |
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matted
Smarty Rookie
Joined: 18 Apr 2004
Posts: 14
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| Posted: Wed Apr 28, 2004 3:01 pm Post subject: Clarification of problem |
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There are two issues. 1) preventing a user from resubmitting, and 2) simply reloading the page when resubmission IS allowed, so simply disabling the form is not good enough. #2 is my problem.
For example, I have a form that writes a file update based on some new input. It can be used over and over again. But every time I submit, i get the Contains post data message. That's what I am trying to prevent. But the submit button still has to work. |
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