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
}