How to declare optional arguments in a function in VBScript?

[maggiezhao]

The following syntax is wrong, is there anyone know how
to define a function with optioanl arguments and
default arguments?

Function f(str1, optional str2)

End Function

 

[topher0303]

Can't be done.

Chris.

 

[DanaHallenbeck]

You could include the 2 variables and then test for the existence of data in the one you want to be optional. A null value will have to be passed to the optional variable if you don't want to use it. If you include a variable in your function call, you have to fill it with something.

Example:

Dim WshShell
Set WshShell = CreateObject("wscript.shell&quot
test "try this",null 'try putting a number in place of the null

Function test(opt1, opt2)
If isnull(opt2) Then
MsgBox opt1
Else
Wshshell.Popup opt1,opt2,"Popup"
End if
End function

Dana Hallenbeck