PowerShell

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