PowerShell

Call a JavaScript Function Returning an Array

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Demonstrates how to call a JavaScript function that returns an array. PowerShell

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

$success = $false

#  ----------------------------------------------------------------------------------
#  The Javascript functions called in this example are shown at the bottom of this page.
#  -----------------------------------------------------------------------------------

$sbScript = New-Object Chilkat.StringBuilder
$success = $sbScript.LoadFile("js_function_returning_array.js","utf-8")
if ($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 each function

$funcCall = New-Object Chilkat.JsonObject

#  Create JSON specifying the function name and arguments
#  The function has no arguments, so we only specify the name.

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

$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())

#  Output:
#  {
#    "type": "array",
#    "value": [
#      "Monday",
#      "Tuesday",
#      "Wednesday",
#      "Thursday",
#      "Friday"
#    ]
#  }

#  Access each array value..
$count = $result.SizeOfArray("value")
$i = 0
while ($i -lt $count) {
    $result.I = $i
    $($result.StringOf("value[i]"))
    $i = $i + 1
}

#  ------------------------------------------------------------------------------
#  Call the getRange(start,end) function

$funcCall.Clear()
$funcCall.UpdateString("name","getRange")
$funcCall.UpdateInt("args[0]",14)
$funcCall.UpdateInt("args[1]",21)
$success = $js.CallFunction($funcCall,$result)
$($result.Emit())

#  Output:
#  {
#    "type": "array",
#    "value": [
#      14,
#      15,
#      16,
#      17,
#      18,
#      19,
#      20,
#      21
#    ]
#  }

$count = $result.SizeOfArray("value")
$i = 0
while ($i -lt $count) {
    $result.I = $i
    $($result.IntOf("value[i]"))
    $i = $i + 1
}

#  ------------------------------------------------------------------------------
#  Call the getEmployees() function

$funcCall.Clear()
$funcCall.UpdateString("name","getEmployees")
$success = $js.CallFunction($funcCall,$result)
$($result.Emit())

#  Output:
#  {
#    "type": "array",
#    "value": [
#      {
#        "id": 101,
#        "name": "Alice",
#        "role": "Dev"
#      },
#      {
#        "id": 102,
#        "name": "Bob",
#        "role": "Manager"
#      }
#    ]
#  }

$count = $result.SizeOfArray("value")
$i = 0
while ($i -lt $count) {
    $result.I = $i
    $("name: " + $result.StringOf("value[i].name"))
    $("role: " + $result.StringOf("value[i].role"))
    $("id: " + $result.IntOf("value[i].id"))
    $("")
    $i = $i + 1
}

JavaScript

function getDays() {
    return ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
}

function getRange(start, end) {
    var arr = [];
    for (var i = start; i <= end; i++) {
        arr.push(i);
    }
    return arr;
}
// Usage: getRange(1, 5) -> [1, 2, 3, 4, 5]

function getEmployees() {
    return [
        { id: 101, name: "Alice", role: "Dev" },
        { id: 102, name: "Bob", role: "Manager" }
    ];
}