PowerBuilder

Call a JavaScript Function Returning an Object

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

integer li_rc
integer li_Success
oleobject loo_SbScript
oleobject loo_Js
oleobject loo_Result
oleobject loo_FuncCall

li_Success = 0

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

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

loo_SbScript = create oleobject
li_rc = loo_SbScript.ConnectToNewObject("Chilkat.StringBuilder")
if li_rc < 0 then
    destroy loo_SbScript
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_SbScript.Append("function getSettings() {")
loo_SbScript.Append("    return {")
loo_SbScript.Append("        theme: ~"dark~",")
loo_SbScript.Append("        notifications: true,")
loo_SbScript.Append("        version: 1.0")
loo_SbScript.Append("    };")
loo_SbScript.Append("}")

loo_Js = create oleobject
li_rc = loo_Js.ConnectToNewObject("Chilkat.Js")

loo_Result = create oleobject
li_rc = loo_Result.ConnectToNewObject("Chilkat.JsonObject")

loo_Result.EmitCompact = 0

// Call Eval to add the function to the context's global object
li_Success = loo_Js.Eval(loo_SbScript,loo_Result)
if li_Success = 0 then
    // Examine the result for an exception.
    Write-Debug loo_Result.Emit()

    // Also examine the LastErrorText.
    Write-Debug loo_Js.LastErrorText
    destroy loo_SbScript
    destroy loo_Js
    destroy loo_Result
    return
end if

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

loo_FuncCall = create oleobject
li_rc = loo_FuncCall.ConnectToNewObject("Chilkat.JsonObject")

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

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

loo_FuncCall.UpdateString("name","getSettings")

li_Success = loo_Js.CallFunction(loo_FuncCall,loo_Result)
if li_Success = 0 then
    // Examine the result for an exception.
    Write-Debug loo_Result.Emit()

    // Also examine the LastErrorText.
    Write-Debug loo_Js.LastErrorText
    destroy loo_SbScript
    destroy loo_Js
    destroy loo_Result
    destroy loo_FuncCall
    return
end if

Write-Debug loo_Result.Emit()

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

// Examine the object's members
Write-Debug "theme: " + loo_Result.StringOf("value.theme")
Write-Debug "notifications: " + string(loo_Result.BoolOf("value.notifications"))
Write-Debug "version: " + string(loo_Result.IntOf("value.version"))

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


destroy loo_SbScript
destroy loo_Js
destroy loo_Result
destroy loo_FuncCall