If your php form is entered via a post, my experience is that most browsers do not save post information, therefore, clicking "back" to a page that was entered via a form using the post method, the browser complains that it does not have enough information to display the form, and that you must retry or something like that. I have found that the simplest way to avoid this is divide each page into two php routines. Displaypage.php will check in session data for contents for the form, or fetch the information from the database, then it will format the html for the page with values from session variables or from the database. The action field of this form will specify the postform.php routine below. Postform.php will perform all validations and echo nothing to the browser. It will then either update session data or post the valid data to the database. The only output of this routine is a header sending the browser back to the previous module displaypage.php when it has done all it can. Notice that anytime you use a header to redirect the browser you can send variables if you need to via the URL parameter list "?var1=1&var2=2" string (they show up in the $_GET array). These variables are saved by all browsers that I know about, which means your displaypage.php program is never entered via a post (and always via a "get"), and because the redirect comes from the postform.php page, the postform.php module is removed from the browser history list by the redirect. This means that every click of the back button, or JavaScript history reference (-1) will take you back to the previous entry in the history list and if you are consistent, none of them will have been entered via a form post (i.e. no complaints). Hope this was clearer than mud, good luck. Warren Vail > -----Original Message----- > From: Cyrus [mailto:cyrus_chan@xxxxxxxxxxxxxxxx] > Sent: Wednesday, December 01, 2004 5:59 PM > To: php-general@xxxxxxxxxxxxx > Subject: Go Back Problem > > > Dear All, > > I have a problem of back to the previous page in php..... > I need to create a form let people to fill in .It can let > user to preview the form, if information is not correct , > user can back to previous page and correct it, > I have used the javascript : OnClick='history.go(-1)' and > OnClick='history.back()' in php , but it can not > works....pls help me. > > Thanks and Regards, > > Cyrus Chan > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
