Issue with a javascript code.

[mike55]

Hi all

 

I am using the following code to get the name of the previous page that the user visited:

Private Function GetPreviousURL() As String

 

Dim script As String = Nothing

 

script &= "<script language=JavaScript id='previous'>" & vbCrLf

script &= "document.referrer;" & vbCrLf

script &= "</script>" & vbCrLf

 

'Verify script has not already been registered.

If Not ClientScript.IsStartupScriptRegistered("previous") Then

'Register the script.

ClientScript.RegisterStartupScript(Page.GetType, "previous", script)

End If

 

End Function

[code]

 

My only problem is that I am unsure as to how to get the value generated by document.referrer back to a vb.net variable. Any suggestions?

 

Mike55.

[MrPaul]

Request.UrlReferrer

 

There is no need to use client-side scripts for this. You can use just:

 

Private Function GetPreviousURL() As String
   Return Request.UrlReferrer
End Function

 

Good luck :cool:

[mike55]

There is no need to use client-side scripts for this. You can use just:

 

Private Function GetPreviousURL() As String
   Return Request.UrlReferrer
End Function

 

Good luck :cool:

 

Thanks for the reply MrPaul.

 

Would love to be able to use that simple command, however, it appears not to work on all occasions. When I call it, it throws an exception, and all hell breaks loose.

 

Mike55.

[PlausiblyDamp]

On what occasions doesn't it work?

[mike55]

Ok, the code:

Request.UrlReferrer.AbsoluteUri

works correctly, if I am moving from page A to B. The problem arises when I use the browser back button to go from page B back to A, or a button that I have added to the page that redirects the user back to page A. I have had a number of problems with the above command in that it does not always have a value, thus causing me problems.

 

Mike55.

[PlausiblyDamp]

You are probably going to encounter the same problems via Javascript that you are encountering from .Net - the Referer will only contain a valid value when you have been referred to the current page (i.e. following a link or submitting a page).