page expired, please refreh note, how to avoid it?

searain

when use back button, sometimes we get the "page expired, please refresh" note.

Is there a way to avoid this note?

Add a refresh javascript to this page to make it refresh every time will avoid this note, right? But it creates unnecessary refresh in the case we didn't back button to this page, it still refresh.

Any suggestions?

Thanks!

konsu

this page is shown by the browser when you navigate to a page that submits a form using a POST request. this is shown to prevent the user from submitting the form multiple times. i would say it is better not to avoid it for sites like online shopping. but if you still want to avoid it, consider using GET to submit forms instead of POST, although the amount of data that can be submitted by a GET request is limited by the maximum length of URL.

LoganK

No, and you won't get that page in Firefox - you'll get an alert. That's something built into browsers to protect online shoppers, who might submit information through POST, and accidentally go back to the page. The browser displays that page to make sure that you explicitly want to re-send that POST data, otherwise online shoppers would end up with two orders.

Sorry, not much you can do.

searain

But for example, I have a search page

After the search form submit, I have a page to display the "search results".

Then the client may go to one of the search results detailed page to view the detail. And then click the back button to go back to the "search results" page.

This "please refresh" notes are troublesome in this case.

Any help?

liquorvicar

i generally avoid these errors by making each POST form go to a processing script which does it's work and then redirects to either a success or failure page:
[form] - [processing] - [display]
since the processing page has no output if uses click back from [display] they get back to [form] without the POST error.

in your case, you could either build the [processing] page to assign all your POST data to the $SESSION superglobal, use GET, or build your own back buttons on the page (populating a new POST form with the $POST data).

searain

So let me wrap up my questions here to see if I understand you guys right.

1) If the post form result page is NOT set to be "expired and no cache". It will cache old information, So when use the back button, it will not have the "resubmit" message. But you may get the old cached (wrong) information, right?

2) If the post form result page is set to be "expired and no cache". When use back button, it will show the the "resubmit" message, because the page is expired, to display it, we need to resubmit the form, right?

3) If the page is set to be "expired with no cache", but the form use "get" method, when use back button, you get the new information, but due to the "get" is in url, it will not need to resubmit to display the new information for you, so that is the reason, ''get" will not show the "resubmit" message?

4) if the page is NOT set to be expired, and the form use the "get" method, when use the back button, what happens? I got the cached old (wrong) information?

5) I didn't set the page to be expired, but I used the session in the page, somehow, it is same as I expire the page, will use session means expire the page?

6) i used to expire the php page as default, so to have best results and not over use the "expire", when should I expire php page and when can I safely not expire it?

7) If I use session in that page, that page will be set to be "expire and no cache", right?

8) so if i don't want to expire that page, i cannot use session at that page, right? so if I cannot use session, i have to use cookie, but cookie has size limitations, right?

9) Any "html or javascript solutions" + php can solve this problem?

Thanks!