Re: Prevent Browser From Going Back

[Jeffrey Lee <jeff@xxxxxxxxxxx>]

On the page that you do not want them to go back to you could put an onload
event that would set the value of all of the fields.

< body onLoad="return empty()" >
<!-- 
<!--
function empty()
{

document.CCForm.CCNumber.value=""
document.CCForm.CCExDate.value=""

return true
}
//-->
// -->


On 1/25/06 6:26 PM, "Joe Giusto II" <midrange@xxxxxxxxxxxx> wrote:

> thanks for that info.  perhaps I should not have said Credit Card.  Just
> happens
> that is the page I am dealing with at this time.  the idea is not to allow the
> user to go back to a previous page (not all pages, just certain ones) after a
> certain point.
> I have noticed when I hit the refresh button on the page, I get a message
> about
> resending the information, which brings the screen back with none of the form
> values filled in.  with this in mind, is there a script that will force the
> refresh when coming back to the page?
> 
> ----- Original Message -----
> From: "Bob Cozzi" <cozzi@xxxxxxxxx>
> To: "'Web Enabling the AS400 / iSeries'" <web400@xxxxxxxxxxxx>
> Sent: Wednesday, January 25, 2006 6:25 PM
> Subject: Re: [WEB400] Prevent Brower From Going Back To Credit Card Page
> 
> 
> Using AJAX techniques you might try this:
> 
> They enter the credit card.
> When they hit submit, you do NOT automatically submit the page.
> Instead you issue an Ajax request (XMLHttpRequest) to the server with the
> credit card data.
> The CGI program you call via that requests, takes the card number, stores it
> someplace on your iSeries, and returns a key to that number. Probably a
> 32-byte MD5 Message Digest. That is the key to a file or user index that
> holds the number.
> Then you return that number to your browser within an XML, for example:
> <?XML version="1.0" ?)
> <CipherData>
>  <ccnbr>1lk2j3h4knfkluasdhfiasnf103</ccnbr>
> </cipherData>
> 
> Then you, using JavaScript set the field containing the credit card number
> to the value returned in the CCNBR value. You may also want to set a hidden
> field to some flag that says you did this conversion in case you want to
> permit back and forth processing.
> Then, while still in the javascript, you issue the normal form submit
> method. This time the subsequent CGI programs use the message digest to
> access the credit card number as needed. The history cache only contains the
> message digest which is worthless to hacks.
> 
> 
> -Bob Cozzi
> www.RPGxTools.com
> RPG xTools - Enjoy programming again.
> 
> 
> -----Original Message-----
> From: web400-bounces@xxxxxxxxxxxx [mailto:web400-bounces@xxxxxxxxxxxx] On
> Behalf Of Joe Giusto II
> Sent: Wednesday, January 25, 2006 3:32 PM
> To: web400@xxxxxxxxxxxx
> Subject: [WEB400] Prevent Brower From Going Back To Credit Card Page
> 
> I am trying to prevent users from using the Back button in the web browser
> to get back to the page where the credit card number was entered.  Or
> alternatively, be able to erase that page from the history log or back
> button log.
> 
> The closest I have come is with this JavaScript, which will throw the page
> forward again when the user hits the back button.
> 
> </script><script
> language="JavaScript">javascript:window.history.forward(-1);</script>
> 
> But does not prevent them from using the drop down arrow on the back button
> to go back several pages to get to it.
> 
> I realize the script will work if I put it on each page, but I need to allow
> them to go back and make changes until the final order page is accepted or
> rejected.  That is when I write out a confirmation page with the script in
> it.
> 
>