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

 

[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

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 doesnt 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).