Classic ASP Requires Chilkat v11.4.0+
Call a JavaScript Function Returning a Boolean

Demonstrates how to call a JavaScript function that returns a boolean.
Chilkat Classic ASP Downloads

Classic ASP
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

'  This is the JavaScript function we'll call:

'  function isEven(number) {
'      return number % 2 === 0;
'  }

set sbScript = Server.CreateObject("Chilkat.StringBuilder")
success = sbScript.Append("function isEven(number) { return number % 2 === 0; }")

set js = Server.CreateObject("Chilkat.Js")

set result = Server.CreateObject("Chilkat.JsonObject")
result.EmitCompact = 0

'  Call Eval to add the function to the context's global object
success = js.Eval(sbScript,result)
If (success = 0) Then
    '  Examine the result for an exception.
    Response.Write "<pre>" & Server.HTMLEncode( result.Emit()) & "</pre>"

    '  Also examine the LastErrorText.
    Response.Write "<pre>" & Server.HTMLEncode( js.LastErrorText) & "</pre>"
    Response.End
End If

'  ------------------------------------------------------------------------------
'  Call the function isEven(8)

set funcCall = Server.CreateObject("Chilkat.JsonObject")

'  Create JSON specifying the function name and arguments

'  {
'    "name": "isEven",
'    "args": [ 8 ]
'  }

success = funcCall.UpdateString("name","isEven")
success = funcCall.UpdateInt("args[0]",8)

success = js.CallFunction(funcCall,result)
If (success = 0) Then
    '  Examine the result for an exception.
    Response.Write "<pre>" & Server.HTMLEncode( result.Emit()) & "</pre>"

    '  Also examine the LastErrorText.
    Response.Write "<pre>" & Server.HTMLEncode( js.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( result.Emit()) & "</pre>"

'  Output:
'  {
'    "type": "bool",
'    "value": true
'  }

retval = result.BoolOf("value")
Response.Write "<pre>" & Server.HTMLEncode( retval) & "</pre>"

'  Output:
'  1

%>
</body>
</html>