PowerShell Requires Chilkat v11.4.0+

Call a JavaScript Function Returning an Object

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

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

$success = $false

#  This is the JavaScript function we'll call:

#  function getSettings() {
#      return {
#          theme: "dark",
#          notifications: true,
#          version: 1.0
#      };
#  }

$sbScript = New-Object Chilkat.StringBuilder
$sbScript.Append("function getSettings() {")
$sbScript.Append("    return {")
$sbScript.Append("        theme: `"dark`",")
$sbScript.Append("        notifications: true,")
$sbScript.Append("        version: 1.0")
$sbScript.Append("    };")
$sbScript.Append("}")

$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 getSettings()

$funcCall = New-Object Chilkat.JsonObject

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

#  {
#    "name": "getSettings",
#  }

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

$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": "object",
#    "value": {
#      "theme": "dark",
#      "notifications": true,
#      "version": 1
#    }
#  }

#  Examine the object's members
$("theme: " + $result.StringOf("value.theme"))
$("notifications: " + $result.BoolOf("value.notifications"))
$("version: " + $result.IntOf("value.version"))

#  Output:
#  theme: dark
#  notifications: True
#  version: 1