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

JavaScript

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;
}