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One of the web applications after I logout when I click on back button I am able to access the admin pages I am looking to block that
Here's the sample code that works
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I tried many many many things on different websites. It never worked. Finally I wrote this code which works,
Here's how it works. you need to greate a dummy page say "somepage.aspx" this page has no content only a redirect.
This is the code below that worked for me. please not somepage.aspx canoot have any other functionality other then
just preventing backbutton press.
SomePage.aspx.vb
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Response.Cache.SetCacheability(HttpCacheability.NoCache)
End Sub
SomePage.aspx
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<script type="text/javascript">
function noBack(){window.history.forward();}
noBack();
window.onload=noBack;
window.onpageshow=function(evt){if(evt.persisted)noBack();}
window.onunload=function(){void(0);}
function delayer(){
window.location = "Default.aspx"
}
</script>
<body onLoad="setTimeout('delayer()', 500)">
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>
BELOW IS THE OLD SOLUTION. I FORGOT WETHER IT WORKED BUT U CAN TWEEK
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The "Back" browser button or any browser button cannot be actually disabled by a web application this is because the security context will not allow this
The solution is to present the browser from caching pages
<%
Response.Buffer = true;
Response.Expires = 0;
Response.ExpiresAbsolute = DateTime.Now.AddDays( -1 );
Response.CacheControl = "no-cache";
%>
or try this
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetExpires(DateTime.Now); //or a date much earlier than current time
In ASP.NET 1.x the code was:
Response.CacheControl = "no-cache";
Response.AddHeader("Pragma","no-cache");
Response.Expires = -1;
This causes the postback to the server everytime the back button is clicked and prevent any caching of the pages.
the above did not work in firefox this is one code that worked for me in all browsers firefox, ie opera etc
<script type="text/javascript">
function noBack(){window.history.forward();}
noBack();
window.onload=noBack;
window.onpageshow=function(evt){if(evt.persisted)noBack();}
window.onunload=function(){void(0);}
</script>
Read more from MS site
http://support.microsoft.com/kb/234067/EN-US
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