PowerShell

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. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# 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;
# }

$sbScript = New-Object Chilkat.StringBuilder
$success = $sbScript.LoadFile("js_function_array_arg.js","utf-8")
if ($success -eq $false) {
    $($sbScript.LastErrorText)
    exit
}

$js = New-Object Chilkat.Js

$result = New-Object Chilkat.JsonObject
$result.EmitCompact = $false

# Call Eval to add the function to the context's global object
$success = $js.Eval($sbScript,$result)
if ($success -eq $false) {
    # Examine the result for an exception.
    $($result.Emit())

    # Also examine the LastErrorText.
    $($js.LastErrorText)
    exit
}

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

$funcCall = New-Object Chilkat.JsonObject
$funcCall.EmitCompact = $false

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

$funcCall.UpdateString("name","calculateTotal")

# Create the arguments array.
$argsArray = New-Object Chilkat.JsonArray

# The 1st argument in the arguments array is itself an array.
# Passing -1 indicates to append to the array.
$arg = New-Object Chilkat.JsonArray
$argsArray.AddArrayAt2(-1,$arg)

# Fill in the values for the 1st argument.
$arg.AddNumberAt(-1,"10.50")
$arg.AddNumberAt(-1,"20.00")
$arg.AddNumberAt(-1,"5.25")

# Add the "args" array to the funcCall.
$funcCall.AppendArrayCopy("args",$argsArray)

$($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
#     ]
#   ]
# }

$success = $js.CallFunction($funcCall,$result)
if ($success -eq $false) {
    # Examine the result for an exception.
    $($result.Emit())

    # Also examine the LastErrorText.
    $($js.LastErrorText)
    exit
}

$($result.Emit())

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

# The function also emitted text to the console.

$sbOut = New-Object Chilkat.StringBuilder
$js.ConsoleOutputSb($sbOut)
$($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:

$funcCall.Clear()
$funcCall.UpdateString("name","calculateTotal")
$funcCall.UpdateNumber("args[0][0]","10.50")
$funcCall.UpdateNumber("args[0][1]","20.00")
$funcCall.UpdateNumber("args[0][2]","5.25")
$($funcCall.Emit())