Xbase++ Requires Chilkat v11.4.0+

Call a JavaScript Function Passing an Array Argument

See more JavaScript Examples

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

LOCAL nSuccess
LOCAL oSbScript
LOCAL oJs
LOCAL oResult
LOCAL oFuncCall
LOCAL oArgsArray
LOCAL oArg
LOCAL oSbOut

nSuccess := 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;
//  }

oSbScript := CreateObject("Chilkat.StringBuilder")
nSuccess := oSbScript:LoadFile("js_function_array_arg.js", "utf-8")
IF (nSuccess == 0)
    ? oSbScript:LastErrorText
    oSbScript:destroy()
    RETURN
ENDIF

oJs := CreateObject("Chilkat.Js")

oResult := CreateObject("Chilkat.JsonObject")
oResult:EmitCompact := 0

//  Call Eval to add the function to the context's global object
nSuccess := oJs:Eval(oSbScript, oResult)
IF (nSuccess == 0)
    //  Examine the result for an exception.
    ? oResult:Emit()

    //  Also examine the LastErrorText.
    ? oJs:LastErrorText
    oSbScript:destroy()
    oJs:destroy()
    oResult:destroy()
    RETURN
ENDIF

//  ------------------------------------------------------------------------------
//  Call the function calculateTotal(numbers)

oFuncCall := CreateObject("Chilkat.JsonObject")
oFuncCall:EmitCompact := 0

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

oFuncCall:UpdateString("name", "calculateTotal")

//  Create the arguments array.
oArgsArray := CreateObject("Chilkat.JsonArray")

//  The 1st argument in the arguments array is itself an array.
//  Passing -1 indicates to append to the array.
oArg := CreateObject("Chilkat.JsonArray")
oArgsArray:AddArrayAt2(-1, oArg)

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

//  Add the "args" array to the funcCall.
oFuncCall:AppendArrayCopy("args", oArgsArray)

? oFuncCall: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
//      ]
//    ]
//  }

nSuccess := oJs:CallFunction(oFuncCall, oResult)
IF (nSuccess == 0)
    //  Examine the result for an exception.
    ? oResult:Emit()

    //  Also examine the LastErrorText.
    ? oJs:LastErrorText
    oSbScript:destroy()
    oJs:destroy()
    oResult:destroy()
    oFuncCall:destroy()
    oArgsArray:destroy()
    oArg:destroy()
    RETURN
ENDIF

? oResult:Emit()

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

//  The function also emitted text to the console.

oSbOut := CreateObject("Chilkat.StringBuilder")
oJs:ConsoleOutputSb(oSbOut)
? oSbOut: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:

oFuncCall:Clear()
oFuncCall:UpdateString("name", "calculateTotal")
oFuncCall:UpdateNumber("args[0][0]", "10.50")
oFuncCall:UpdateNumber("args[0][1]", "20.00")
oFuncCall:UpdateNumber("args[0][2]", "5.25")
? oFuncCall:Emit()

oSbScript:destroy()
oJs:destroy()
oResult:destroy()
oFuncCall:destroy()
oArgsArray:destroy()
oArg:destroy()
oSbOut:destroy()

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;
}