Error checking for NULL in VBScript

Question

I have the following VBScript in a Classic ASP page:

function getMagicLink(fromWhere, provider)
    dim url 
    url = \"magic.asp?fromwhere=\" & fromWhe         


        

Answer 1

I will just add a blank ("") to the end of the variable and do the comparison. Something like below should work even when that variable is null. You can also trim the variable just in case of spaces.

If provider & "" <> "" Then 
    url = url & "&provider=" & provider 
End if