asked on

redirect a user by where they came from

I have a cold fusion app that i need to add some redirection code to trhe front page of

the home page is index.cfm

when this page is accessed i want to find out where the user has come from, if the user has come from URL a then i dont want the script to anything, it should just carry on with the rest of the code on the page. but if the refurer is not URL a then the user should be redirected to URL B

URL_A = http://mysite.com/application

URL_B = http://somothersite/application

ASKER CERTIFIED SOLUTION

sandy12879

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willa666

ASKER

Hi sandy12879

could you provide a full example, i am not a CF developer and need this to add a hot fix to the app :)

SOLUTION

_agx_

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willa666

ASKER

Good morning _agx_

So what would you suggest?

_agx_

Good day :)

I would still use CGI.http_referer. Its a simple string variable that you can parse using string or list functions. I only mentioned it because some people don't realize the value can be blank. So they fail to setup a condition to handle that case.

If you create a simple page with a link, you can experiment with the available CGI variables.


<a href="somedirec/somepage.cfm?id=23&phrase=maps">GO</a>



<cfdump var="#CGI#">

Results from: somedirec/somepage.cfm
===================================
HTTP_REFERER = http://127.0.0.1/somedirec/somePage.cfm?id=85&phrase=maps

_agx_

Oops. The referrer results should have been:

HTTP_REFERER = http://127.0.0.1/somedirec/somePage.cfm?id=23&phrase=maps

willa666

ASKER

so would something like this work, for what i want to do?

<cfset URLA ="http://mysite.com/application">
<cfset URLB ="http://somothersite/application">

<cfif #CGI.HTTP_REFERER# eq URLA >
<cflocation url=URLB >
<cfelse>
</cfif>

_agx_

The referer may also contain url variables:
http://mysite.com/application/index.cfm?id=23&phrase=maps

So it might be safer to use something like findNoCase() rather than EQ

<cfif findNoCase("http://mysite.com/application", CGI.HTTP_REFERER) gt 0>
... do something
<cfelse>
... do something else
</cfif>

willa666

ASKER

Ok, so does findNoCase look for a matching string inside CGI.HTTP_REFERER?

IE if the CGI.HTTP_REFERER was http://mysite.com/application/somepage.cfm?var1=val1 then it would find http://mysite.com/application in that string? and of course all the letter are converted to lower case.

sandy12879

<cfparam
name="URL.A"
type="string"
default="No"
/>

<cfparam
name="URL.B"
type="boolean"
default="false"
/>


<cfif URL.A>
<cflocation
url="#CGI.script_name#?URLA=Yes"
addtoken="false"
/>
</cfif>
</cfsilent>
<cfoutput>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
</head>
<body>

CFLocation: #URL.A# 
Referrer: #ListFirst(
ListLast( CGI.http_referer, "\/" ),
"?"
)#



<a
href="#CGI.script_name#"
>Refresh</a>

 | 
<a
href="#CGI.script_name#?URL.B=true"
>Refresh With CFLocation</a>

</body>
</html>
</cfoutput>

Try this shd take care of blank scenario also as mentioned by agx...
let me know if it works......

_agx_

> Ok, so does findNoCase look for a matching string inside CGI.HTTP_REFERER?

Yes

willa666

ASKER

thanx sandy12879 i will try this and my little hack code and see how we go.

I have to drive into the office now so it will be an hour or so till this gets tested :)

willa666

ASKER

Hi guys

well #CGI.HTTP_REFERER# does not show up the referer if you go from one domain to another.

Any ideas?

W

_agx_

Why do you say that?

willa666

ASKER

ok so i managed to sort it out guys! :)