PowerShell

Eval JavaScript Returning String

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Demonstrates getting the completion value of a JavaScript that returns a string. PowerShell

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

$success = $false

#  This example demonstrates getting the completion value of a script,
#  where the last evaluated expression is a string.

#  The Javascript run in this example is shown below.

#  Load the JavaScript from a file.
$sbScript = New-Object Chilkat.StringBuilder
$success = $sbScript.LoadFile("js_eval_return_string.js","utf-8")
if ($success -eq $false) {
    $($sbScript.LastErrorText)
    exit
}

$js = New-Object Chilkat.Js
$result = New-Object Chilkat.JsonObject

#  Run the JavaScript
#  Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
#  In this case, the last evaluated expression is a string.
$success = $js.Eval($sbScript,$result)
if ($success -eq $false) {
    $($js.LastErrorText)
    exit
}

$result.EmitCompact = $false
$($result.Emit())

#  Output:

#  {
#    "type": "string",
#    "value": "Ready for Chilkat.Js"
#  }

JavaScript

var status = "Ready";
var system = "Chilkat.Js";

// The last statement is an expression
status + " for " + system;