Pass Nothing from Javascript to VBScript in IE9

Javascript Problem Overview

I have a framework written in VBScript. Inside some function in this framework parameter of the function is checked for Nothing in If statement and then some actions executed. Code that uses framework written in Javascript. So I need to pass Nothing to function to perform some actions. In IE8 and earlier versions worked next approach:

<script type="text/vbscript">
	Function Test(val)
		If (IsNull(val)) Then
			Test = "Null"
		ElseIf (IsObject(val)) Then
			If (val Is Nothing) Then
				Test = "Nothing"
			End If
		End If
	End Function

	Dim jsNothing
	Set jsNothing = Nothing
	msgBox(Test(jsNothing))
	msgBox(Test(Null))
</script>


<script type="text/javascript">
	alert(Test(jsNothing));
</script>

In IE < 9 output will: Nothing, Null, Nothing.

In IE9: Nothing, Null, Null.

How can I pass Nothing from Javascript to VBScript in IE9?

Sorry, I know it's ugly, but I'm trapped. And hate VBScript.

edit: There is an example of framework function. I can not change it because it is widely used in application.

Function ExampleFunction(val)
	If (val Is Nothing) Then
		ExampleFunction = 1
	Else
		ExampleFunction = 0
	End If
End Function

Update

Quit job. Found a better one.

Javascript Solutions

Solution 1 - Javascript

Unfortunately, you are probably stuck here - JavaScript does not have a "Nothing" equivalent. See This Article for more information.

[Edit] However, the following may work. In your VBScript create a function called "GetNothing" that returns "Nothing". In your JavaScript use "var jsNothing = GetNothing()". Comes from this article

Solution 2 - Javascript

This question is fascinating, I thought I'd try and answer it just for the fun of it.

(Congrats to mixel on getting a better job!)

I don't have access to IE right now, so I can't test this, but what if you tried writing a function like this:

<script type="text/vbscript">
  Function CallWithNulls(fn, arg1, arg2, arg3)
    If (isNull(arg1)) arg1 = Nothing
    If (isNull(arg2)) arg2 = Nothing
    If (isNull(arg3)) arg3 = Nothing
    fn(arg1, arg2, arg3)
  End Function
  Function IsNothing(arg1, arg2, arg3)
     return arg1 is Nothing
  End Function
</script>
<script type="text/javascript">
  alert(CallWithNulls(IsNothing, null, 1, 2));
</script>

Of course I don't know if VB script allows calling functions like that... and you'd have to deal with more/fewer arguments.

Solution 3 - Javascript

Use a value such as zero or even a negative number that would allow for you simply use falsy evaluations, then you don't have to worry about different browsers and their quirks in evaluating the NULL object.

Solution 4 - Javascript

As an example, something like this will work but if the browser is IE11 or later you will need the 'meta' tag.

<HTML>
<HEAD>
<meta http-equiv="x-ua-compatible" content="IE=10">
<TITLE>Pass Javscript to VBScript</TITLE>

<script>
	var val = "null";
	
	window.alert("Test: " +  val);
</script>

<script type="text/vbscript">
	
	PassNothing(val)
		
		
	Sub PassNothing(value)
		If LCase(value) = "null" Then
			MsgBox "Java passed 'null' so VBScript = 'Nothing'"
		Else
			Msgbox "Nothing received"
		End If
	End Sub

	</script>
	
</HEAD>
</HTML>

Content Type	Original Author	Original Content on Stackoverflow
Question	mixel	View Question on Stackoverflow
Solution 1 - Javascript	Pandelon	View Answer on Stackoverflow
Solution 2 - Javascript	cwohlman	View Answer on Stackoverflow
Solution 3 - Javascript	Timothy Allyn Drake	View Answer on Stackoverflow
Solution 4 - Javascript	svstackoverflow	View Answer on Stackoverflow