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ASP FAQ Tutorials :: Classic ASP 1.0 :: General Topics :: How do I make sure people go to page x before page y?
How do I make sure people go to page x before page y?
There are at least three valid answers to this, depending on your goal.
- If you need to make sure that someone has been to a.asp before you will process anything on b.asp, you can set a session variable in a.asp that flags a.asp as having been visited. Check for this session variable in b.asp; if it exists/is true, do the processing.
a.asp:
<%
session("VisitedPageA") = true
%>
b.asp:
<%
if (session("VisitedPageA")) then
Response.Write "They've been to page a."
else
Response.Redirect "a.asp"
end if
%> - If you need to make sure that b.asp is only accessed once per session, you can set a session variable in that page, check to see if that variable exists... if it does, that means they've already been there.
a.asp:
<%
if (session("VisitedPageA")) then
Response.Write "Hey, you've already been here!"
Response.End
else
session("VisitedPageA") = true
end if
%>
Remember that not all users have enabled session cookies, so for some users, the above solutions won't work.
- If you need to make sure that someone goes directly from a.asp to b.asp, check Request.ServerVariables("HTTP_REFERER") in b.asp. If it's not a.asp, then they didn't arrive here through the proper route.
a.asp:
<%
Response.Redirect "a.asp"
%>
b.asp:
<%
ref = Request.ServerVariables("HTTP_REFERER")
if lcase(ref) <> "http://yourserver/yourpage.asp" then
Response.Redirect "a.asp"
end if
%>
However, you might need a workaround, depending on how users move around your site (see Article #2169 for information about the problems with HTTP_REFERER).
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