Prevent Page Refresh

[Bari Allen]

How do I prevent a user from going back to a previous page, and also from
refreshing a current page? Forgive me for my ignorance, here; but I've
created a credit card billing page that has a form, which is processed on a
"Thank you form", which processes through Verisign & to a SQL database.
More than occasionally, people are being "double-billed". In some cases,
they are refreshing the page, and other times they're returning "back" to
the submission page, changing the "name on card" to include a middle
initial, or something of the like and resubmitting the form. How do I
prevent the user from doing this? Thanks in advance for your help.

Bari

[Ray at]

You cannot prevent people from doing foolish things, but you can prevent
posting-back by means of a refresh by not displaying any response on the
page that processes the form data, i.e.


pagewithform.asp--POST--pagethatprocesses.asp---REDIRECT---pagewiththankyou.
asp

If the person refreshes, all he'll get is the thank you page again.

Aside from that, you'll have to check for double postings in code on the
server.

Ray at work

"Bari Allen" <bari@sos.REMOVETHIS.state.ga.us> wrote in message
news:%23o4OvlJUDHA.2228@tk2msftngp13.phx.gbl...

> How do I prevent a user from going back to a previous page, and also from
> refreshing a current page? Forgive me for my ignorance, here; but I've
> created a credit card billing page that has a form, which is processed on

a

> "Thank you form", which processes through Verisign & to a SQL database.
> More than occasionally, people are being "double-billed". In some cases,
> they are refreshing the page, and other times they're returning "back" to
> the submission page, changing the "name on card" to include a middle
> initial, or something of the like and resubmitting the form. How do I
> prevent the user from doing this? Thanks in advance for your help.
>
> Bari
>
>

[Bari Allen]

I'm looking at all of your suggestions. Thank you. The session code would
also be helpful, if you would post it :)
Bari

"John Beschler" <giles@geewhiz.com> wrote in message
news:007201c351f9$09971a30$a301280a@phx.gbl...

> I had a similiar problem with one of my sites. What I did
> was store a session variable that controlled whether the
> page would load or not. As soon as the user clicked the
> submit button, I changed the session variable to prevent
> the page from reloading. If you need the details leave a
> note here and I'll pull the code and post it.
>
> John
>
>
>
>

> >-----Original Message-----
> >How do I prevent a user from going back to a previous

> page, and also from

> >refreshing a current page? Forgive me for my ignorance,

> here; but I've

> >created a credit card billing page that has a form, which

> is processed on a

> >"Thank you form", which processes through Verisign & to a

> SQL database.

> >More than occasionally, people are being "double-

> billed". In some cases,

> >they are refreshing the page, and other times they're

> returning "back" to

> >the submission page, changing the "name on card" to

> include a middle

> >initial, or something of the like and resubmitting the

> form. How do I

> >prevent the user from doing this? Thanks in advance for

> your help.

> >
> >Bari
> >
> >
> >.
> >

[John Beschler]

In the form page (data entry)
Session("OK2Pro") = True

In the process page:
if Session("OK2Pro") <> true then
response.redirect("default.asp")
else
Session("OK2Pro") = False
End if


When the user clicks the submit button, the first thing
the process page does is set the session variable to
False. Then if the user clicks the back button, Session
("OK2Pro") will be false and the user will be redirected
to the main page if they click submit a second time.

This also prevents the user from updating data on the
server if they leave their browser open on the form page
for longer than the session timeout value. Since Session
("OK2Pro") will be empty after session timeout, the user
will be redirected to the main page.

>-----Original Message-----
>I'm looking at all of your suggestions. Thank you. The

session code would

>also be helpful, if you would post it :)
>Bari
>
>"John Beschler" <giles@geewhiz.com> wrote in message
>news:007201c351f9$09971a30$a301280a@phx.gbl...

>> I had a similiar problem with one of my sites. What I

did

>> was store a session variable that controlled whether the
>> page would load or not. As soon as the user clicked the
>> submit button, I changed the session variable to prevent
>> the page from reloading. If you need the details leave a
>> note here and I'll pull the code and post it.
>>
>> John
>>
>>
>>
>>

>> >-----Original Message-----
>> >How do I prevent a user from going back to a previous

>> page, and also from

>> >refreshing a current page? Forgive me for my

ignorance,

>> here; but I've

>> >created a credit card billing page that has a form,

which

>> is processed on a

>> >"Thank you form", which processes through Verisign &

to a

>> SQL database.

>> >More than occasionally, people are being "double-

>> billed". In some cases,

>> >they are refreshing the page, and other times they're

>> returning "back" to

>> >the submission page, changing the "name on card" to

>> include a middle

>> >initial, or something of the like and resubmitting the

>> form. How do I

>> >prevent the user from doing this? Thanks in advance

for

>> your help.

>> >
>> >Bari
>> >
>> >
>> >.
>> >

>
>
>.
>