Controlling Navigation With PHP

[Xeon]

Hi,

I got a set of pages which must be navigated in a strict manner. Let's
just say the pages are named A, B, C, and so on. I got no problem with
forward navigation, but I want to disable the client browser's back
button. More specifically, if the user is currently at page D, the
back button doesn't bring the user to page C, but page A instead
(assuming consecutive navigation, from A to B to C and so on).

How can I achieve this with PHP, assuming both the server and the
client are behind strict firewall (both referer and cookies disabled),
and use of client-side javascript are avoided as much as possible (or
even considered disabled as well, either by the firewall or the
browser's setting)?

TIA

[Pedro Graca]

Re: Controlling Navigation With PHP

Xeon wrote:[color=blue]
> I got a set of pages which must be navigated in a strict manner. Let's
> just say the pages are named A, B, C, and so on. I got no problem with
> forward navigation, but I want to disable the client browser's back
> button. More specifically, if the user is currently at page D, the
> back button doesn't bring the user to page C, but page A instead
> (assuming consecutive navigation, from A to B to C and so on).
>
> How can I achieve this with PHP, assuming both the server and the
> client are behind strict firewall (both referer and cookies disabled),
> and use of client-side javascript are avoided as much as possible (or
> even considered disabled as well, either by the firewall or the
> browser's setting)?[/color]


Not tested
=============== =============== =========

page A:
<?php
// disable caching!
session_start() ;
$_SESSION['last_page'] = 'A';
// rest of page A
?>


page B:
<?php
// disable caching!
session_start() ;
if (!isset($_SESSI ON['last_page']) || $_SESSION['last_page'] != 'A') {
header('Locatio n: pageA');
}
$_SESSION['last_page'] = 'B';
// rest of page B
?>


page C:
<?php
// disable caching!
session_start() ;
if (!isset($_SESSI ON['last_page']) || $_SESSION['last_page'] != 'B') {
header('Locatio n: pageA');
}
unset($_SESSION['last_page']);
// rest of page C
?>


page D (and all other pages):
<?php
session_start() ;
unset($_SESSION['last_page']);
// rest of page D
?>


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[Tony Marston]

Re: Controlling Navigation With PHP


"Xeon" <xdblade@zworg. com> wrote in message
news:78321f06.0 407031232.586d4 7a7@posting.goo gle.com...[color=blue]
> Hi,
>
> I got a set of pages which must be navigated in a strict manner. Let's
> just say the pages are named A, B, C, and so on. I got no problem with
> forward navigation, but I want to disable the client browser's back
> button.[/color]

It is simply not possible to disable the BACK button the browser. Take a
look at http://www.tonymarston.co.uk/php-mys...ttonblues.html for a
workaround.

--
Tony Marston

http://www.tonymarston.net

[color=blue]
> More specifically, if the user is currently at page D, the
> back button doesn't bring the user to page C, but page A instead
> (assuming consecutive navigation, from A to B to C and so on).
>
> How can I achieve this with PHP, assuming both the server and the
> client are behind strict firewall (both referer and cookies disabled),
> and use of client-side javascript are avoided as much as possible (or
> even considered disabled as well, either by the firewall or the
> browser's setting)?
>
> TIA[/color]