Back button/clearing form
Posted: Sun May 14, 2006 4:15 pm
Anyone know of any php that would stop a form from being cleared everytime somebody presses the back button?
Thanks.
Chris
Thanks.
Chris
A community of PHP developers offering assistance, advice, discussion, and friendship.
http://forums.devnetwork.net/
hervard at gmail dot com wrote:When using HTML forms, using the browser's back button will sometimes display a message regarding using cached data, and will ask you to refresh the page. This can be very disconcerting for some users, as they might not know whether to hit Refresh or not.
To force pages to always load the data that was entered in the form prior to hitting a submit button, and prevent the browser's cache message from displaying, use the following code:
This will tell the browser that the page will expire in one day, and the cached form data will be used without prompting the user at all.Code: Select all
<?php // Original code found at http://www.mnot.net/cache_docs/ header("Cache-Control: must-revalidate"); $offset = 60 * 60 * 24 * -1; $ExpStr = "Expires: " . gmdate("D, d M Y H:i:s", time() + $offset) . " GMT"; header($ExpStr); ?>
I have tested this in Internet Explorer 6, Firefox 1.5, and Opera 8.51, and it works as intended. I have tried other cache-control and expiry variants, but they either do not work, or do not work in every browser. This code appears to be a winner.