PowerBuilder

Call a JavaScript Function Returning a Boolean

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Demonstrates how to call a JavaScript function that returns a boolean. PowerBuilder

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

li_Success = 0

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

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

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 isEven(8)

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

// Create JSON specifying the function name and arguments

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

loo_FuncCall.UpdateString("name","isEven")
loo_FuncCall.UpdateInt("args[0]",8)

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": "bool",
//   "value": true
// }

li_Retval = loo_Result.BoolOf("value")
Write-Debug string(li_Retval)

// Output:
// 1


destroy loo_SbScript
destroy loo_Js
destroy loo_Result
destroy loo_FuncCall