Re: Prevent Browser From Going Back

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.
> 
>