PowerBuilder

Call a JavaScript Function Passing an Array Argument

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Demonstrates how to call a JavaScript function with an argument that is an array. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_SbScript
oleobject loo_Js
oleobject loo_Result
oleobject loo_FuncCall
oleobject loo_ArgsArray
oleobject loo_Arg
oleobject loo_SbOut

li_Success = 0

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

// function calculateTotal(numbers) {
//   console.log(numbers);
//   let total = 0;
//   
//   // Loop through every number in the array
//   for (const num of numbers) {
//     console.log(num);
//     total += num;
//   }
//   
//   return total;
// }

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
li_Success = loo_SbScript.LoadFile("js_function_array_arg.js","utf-8")
if li_Success = 0 then
    Write-Debug loo_SbScript.LastErrorText
    destroy loo_SbScript
    return
end if

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 calculateTotal(numbers)

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

loo_FuncCall.EmitCompact = 0

// Create JSON specifying the function name and arguments
// In this case, there is only 1 argument, and it is an array.

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

// Create the arguments array.
loo_ArgsArray = create oleobject
li_rc = loo_ArgsArray.ConnectToNewObject("Chilkat.JsonArray")

// The 1st argument in the arguments array is itself an array.
// Passing -1 indicates to append to the array.
loo_Arg = create oleobject
li_rc = loo_Arg.ConnectToNewObject("Chilkat.JsonArray")

loo_ArgsArray.AddArrayAt2(-1,loo_Arg)

// Fill in the values for the 1st argument.
loo_Arg.AddNumberAt(-1,"10.50")
loo_Arg.AddNumberAt(-1,"20.00")
loo_Arg.AddNumberAt(-1,"5.25")

// Add the "args" array to the funcCall.
loo_FuncCall.AppendArrayCopy("args",loo_ArgsArray)

Write-Debug loo_FuncCall.Emit()

// The funcCall is as follows.  Notice that the 1st (and only) argument is an array.

// {
//   "name": "calculateTotal",
//   "args": [
//     [
//       10.50,
//       20.00,
//       5.25
//     ]
//   ]
// }

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
    destroy loo_ArgsArray
    destroy loo_Arg
    return
end if

Write-Debug loo_Result.Emit()

// Result:
// {
//   "type": "double",
//   "value": 35.75
// }

// The function also emitted text to the console.

loo_SbOut = create oleobject
li_rc = loo_SbOut.ConnectToNewObject("Chilkat.StringBuilder")

loo_Js.ConsoleOutputSb(loo_SbOut)
Write-Debug loo_SbOut.GetAsString()

// Output:
// 10.5,20,5.25
// 10.5
// 20
// 5.25

// -----------------------------------------------------------
// Note: If the array argument is simple, this is an alternative
// and simpler way of creating the funcCall:

loo_FuncCall.Clear()
loo_FuncCall.UpdateString("name","calculateTotal")
loo_FuncCall.UpdateNumber("args[0][0]","10.50")
loo_FuncCall.UpdateNumber("args[0][1]","20.00")
loo_FuncCall.UpdateNumber("args[0][2]","5.25")
Write-Debug loo_FuncCall.Emit()


destroy loo_SbScript
destroy loo_Js
destroy loo_Result
destroy loo_FuncCall
destroy loo_ArgsArray
destroy loo_Arg
destroy loo_SbOut