Xojo Plugin Requires Chilkat v11.4.0+

Call a JavaScript Function Returning an Object

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Demonstrates how to call a JavaScript function that returns an object. Xojo Plugin

Dim success As Boolean
success = False

//  This is the JavaScript function we'll call:

//  function getSettings() {
//      return {
//          theme: "dark",
//          notifications: true,
//          version: 1.0
//      };
//  }

Dim sbScript As New Chilkat.StringBuilder
success = sbScript.Append("function getSettings() {")
success = sbScript.Append("    return {")
success = sbScript.Append("        theme: ""dark"",")
success = sbScript.Append("        notifications: true,")
success = sbScript.Append("        version: 1.0")
success = sbScript.Append("    };")
success = sbScript.Append("}")

Dim js As New Chilkat.Js

Dim result As New Chilkat.JsonObject
result.EmitCompact = False

//  Call Eval to add the function to the context's global object
success = js.Eval(sbScript,result)
If (success = False) Then
    //  Examine the result for an exception.
    System.DebugLog(result.Emit())

    //  Also examine the LastErrorText.
    System.DebugLog(js.LastErrorText)
    Return
End If

//  ------------------------------------------------------------------------------
//  Call the function getSettings()

Dim funcCall As New Chilkat.JsonObject

//  Create JSON specifying the function name and arguments
//  The function has no arguments, so we only specify the name.

//  {
//    "name": "getSettings",
//  }

success = funcCall.UpdateString("name","getSettings")

success = js.CallFunction(funcCall,result)
If (success = False) Then
    //  Examine the result for an exception.
    System.DebugLog(result.Emit())

    //  Also examine the LastErrorText.
    System.DebugLog(js.LastErrorText)
    Return
End If

System.DebugLog(result.Emit())

//  Output:
//  {
//    "type": "object",
//    "value": {
//      "theme": "dark",
//      "notifications": true,
//      "version": 1
//    }
//  }

//  Examine the object's members
System.DebugLog("theme: " + result.StringOf("value.theme"))
System.DebugLog("notifications: " + Str(result.BoolOf("value.notifications")))
System.DebugLog("version: " + Str(result.IntOf("value.version")))

//  Output:
//  theme: dark
//  notifications: True
//  version: 1