| Re: Session Cache [message #169396 is a reply to message #169394] |
Thu, 09 September 2010 12:40   |
alvaro.NOSPAMTHANX
Messages: 277
Registered: September 2010
Karma:
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Senior Member |
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El 09/09/2010 13:57, GarryJones escribió/wrote:
>> How do you want to recover previous form values? Saving them into a
>> session variable or leveraging the browser cache? You are mixing
>> directives for both purposes.
>
> Out of my depth as usual....
>
> What I want...
>
> The user fills in the form input textboxes, clicks textboxes and
> submits form for preview.
> The user sees he has misspelt something or forgotten to tick a box.
>
> He clicks back on the browser. If he does this within say 5 minutes
> then he will return to the form in its previous state, all text and
> boxes will still be entered and status held for checkboxes. (I have
> got this working). The user can also click cancel on the form instead
> of ok, For that I use<input type="button" value="Cancel"
> onClick="history.back()">
>
> The way I got this working was to put
> session_cache_limiter(private_no_expire); before the session_start()
Sorry if I didn't explain myself correctly. I think it's pretty clear
*what* you want to accomplish. But you don't even mention *how* you want
to do it.
Unless I misread your messages, you are not asking for generic ideas
about how it can be done in PHP. You mention some random PHP functions
you are using, you explain that "it didn't work" and you ask some
extremely specific questions that are difficult to put in context.
> If he has waited more than 5 minutes then "page has expired" will be
> displayed in msie. (Resend or something in firefox). In both msie&
> firefox the keyed in data is gone and he will have to start again. I
> don't care about macintosh, google crome, safari or iphone. If people
> use those products that can expect to have to key in the entire data
> again. I don't need to overwork this little problem. Msie v7+ and
> Firefox 2.6+ catches 99% of my users.
>
> For the timeout I tried
> session_cache_limiter('public');
> session_cache_expire (1);
> session_start();
>
> But that didn't work.
>
> So how do I "add" a timeout to
> session_cache_limiter(private_no_expire) ?
> no_expire makes me feel that a timeout can not be added. In that case
> what do I put in to get what I want, ability to use back and cancel
> for 5 minutes.
You cannot add a timeout to an HTTP header. The whole idea does not make
any sense... Given that you "quote" it, I presume it's not a literal
expression.
I'll start guessing:
You want to instruct the browser to keep an HTML document in cache for
certain amount of time (but not more).
In that case, you need to generate the following HTTP headers:
<?php
$minutes = 5;
header('Expires: ' . gmdate('D, d M Y H:i:s', time()+60*$minutes) . ' GMT');
header('Cache-Control: max-age=' . 60*$minutes . ', s-maxage=' .
60*$minutes . ', must-revalidate, proxy-revalidate');
session_cache_limiter(FALSE); // Disable cache headers by session_start()
if( session_id() ){
// session_start() has already generated a "Pragma: no-cache" header
if( function_exists('header_remove') ){
header_remove('Pragma');
}else{
header('Pragma:');
}
}
?>
I haven't tested with POST forms but it should possibly work.
Of course, it's up to the browser whether to obey or discard these
rules. If you want a stronger server-side control, you'd need to send a
new form each time (with previous values pre-filled).
--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://borrame.com
-- Mi web de humor satinado: http://www.demogracia.com
--
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