Instantiating a VBScript class in JavaScript

russellloi · January 7th, 2004, 09:49 PM

Hi
I have created a class in VBScript (server-side) and would like to instantiate it from within JavaScript (server-side). At the top of my ASP page (the one containing the server-side JavaScript) I have used an #include statement to reference the page with the VBScript. Is it at all possible to instantiate a VBScript class in JavaScript? I have scoured the web for the last couple of hours and have not been able to get an answer. Much appreciated of any help.

Cheers
Russell

pgtips · January 8th, 2004, 08:22 AM

I had a similar problem where I wanted to instantiate a js class from vbs and I never found a way to do it directly. What I did instead was write wrapper functions in js for each of the class methods I wanted to call - luckily I only had a few methods.

For example lets say you have a VB class called foo with a single method called bar. Then what you do is
1.add a new VBS variable to contain the class instance
2.add a new wrapper function to create the class object and store it in the new variable
3.add a new wrapper function to call the class method using the new stored variable
example:

Code:

' VBS code
Dim vbClassVar
Function createFooClass()
    Set vbClassVar = New foo
End Function
Function callBarMethod(param1, param2, paramN)
    callBarMethod = vbClassVar.bar(param1, param2, paramN)
End Function

//JS code
createFooClass(); 
var x = callBarMethod(param1, param2, paramN);

hth
Phil

planoie · January 8th, 2004, 08:22 AM

I think you are out of luck with this. They are two different languages. I know that with the right pokes and prods you can get client-side VBS and JS to share variables, but not much more than that. But server-side, I can't imagine it'd be possible.

Peter
------------------------------------------------------
Work smarter, not harder.

pgtips · January 12th, 2004, 11:17 AM

Another way to do this would be to turn your VBS class into a scriptlet, which is a COM object written in script. You would then be able to create the VBS class from JS using the standard COM way of new ActiveXObject(...)

see here for more details on scriptlets
http://msdn.microsoft.com/library/de...letcreates.asp

SageCat · July 14th, 2004, 11:47 AM

There is actually a really easy way to do this. Assume an object "Foo." In your VB class file, but not the class itself, create a "constructor" function that looks like this:

Function NewFoo()
Set NewFoo = New Foo
End Function

Class Foo
[Foo code here]
End Class

In the javascript code, you'd do this:

var oFoo = NewFoo()

You can optionally pass in arguments to this function (if the VB corresponding function accepts them) and configure your new object appropriately.

&y