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Using Back Button
- Thread starter bduke
- Start date
no!
but you can validate where they came from and catch that conmdition in the other pages. you can manipulate the cache settings also.
what exactely is it you want to do?
____________________________________________________
Python????? The other programming language you never thought of!
thread333-584700
but you can validate where they came from and catch that conmdition in the other pages. you can manipulate the cache settings also.
what exactely is it you want to do?
____________________________________________________
Python????? The other programming language you never thought of!
thread333-584700
- Thread starter
- #3
I had the same problem a few projects ago and I found the following code online... You'll have to adapt it to your purposes, but the idea is that it detects whether the page was pulled from the cache (assuming by the back button) or loaded.
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<BODY ONLOAD="handleBackButton()">
<FORM NAME="_mine">
<INPUT NAME="_a1" VALUE="1" STYLE="visibility:hidden">
</FORM>
<SCRIPT LANGUAGE="JAVASCRIPT">
var x="1";
var isBack;
function handleBackButton(){
isBack = (x != document._mine._a1.value);
document._mine._a1.value=2;
document._mine._a1.defaultValue=2;
}
function isBackButtonUsed(){
return isBack;
}
</SCRIPT>
<H1>Back button testing</H1>
<form>
<input type=button value="is back button" onclick="(isBackButtonUsed())?
alert('Back button was used'):alert('Page was loaded normally')">
</form>
</BODY>
</HTML>If you put this at the top of the page they shouldn't be able to back into it. They'll get a message that the page has expired. Keep in mind though that you can hit the refresh button and reload it.
<%
Response.ExpiresAbsolute = #2000-01-01#
Response.AddHeader "pragma", "no-cache"
Response.AddHeader "cache-control", "private, no-cache, must-revalidate"
%>
<%
Response.ExpiresAbsolute = #2000-01-01#
Response.AddHeader "pragma", "no-cache"
Response.AddHeader "cache-control", "private, no-cache, must-revalidate"
%>
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