A PowerShell script SharePoint Online that will recursively sort the Quick Launch navigation for a web and its subwebs

O365QuickLaunchSortRecursive.ps1

[CmdletBinding()]
Param(
    [Parameter(Mandatory=$true, HelpMessage="This is the URL to the SharePoint Online site.")]
    [string]$Url, 

    [Parameter(Mandatory=$true, HelpMessage="This is the ordering method: 0=Automatic, 1=Manual with Automatic Page Sorting, 2=Manual.")]
    [ValidateSet(0, 1, 2)]
    [int]$OrderingMethod,

    [Parameter(Mandatory=$true, HelpMessage="This is the automatic sorting method: 0=Title, 1=Created Date, 2=Last Modified Date.")]
    [ValidateSet(0, 1, 2)]
    [int]$AutomaticSortingMethod,

    [Parameter(Mandatory=$true, HelpMessage="This is to sort the navigation nodes in ascending order.")]
    [bool]$SortAscending,

    [Parameter(Mandatory=$true, HelpMessage="This is the path to the DLLs for CSOM.")]
    [string]$CSOMPath
)

Set-Strictmode -Version 1

If ($CSOMPath -eq $null -or $CSOMPath -eq "") { $CSOMPath = "." }

Add-Type -Path "$CSOMPath\Microsoft.SharePoint.Client.dll" 
Add-Type -Path "$CSOMPath\Microsoft.SharePoint.Client.Runtime.dll" 

function getWeb ([Microsoft.SharePoint.Client.Web]$currentWeb) {
    $clientContext.Load($currentWeb)
    $clientContext.Load($currentWeb.AllProperties)
    $clientContext.Load($currentWeb.Webs)
    $clientContext.ExecuteQuery()

    Write-Host $currentWeb.Title: $currentWeb.Url

    $currentWeb.AllProperties["__NavigationOrderingMethod"] = $OrderingMethod
    $currentWeb.AllProperties["__NavigationAutomaticSortingMethod"] = $AutomaticSortingMethod
    $currentWeb.AllProperties["__NavigationSortAscending"] = $SortAscending
    $currentWeb.Update()
    $clientContext.ExecuteQuery()

    $currentWeb.Webs | ForEach-Object {
        getWeb($_)
    }
}

$psCredentials = Get-Credential
$spoCredentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($psCredentials.UserName, $psCredentials.Password)
$clientContext = New-Object Microsoft.SharePoint.Client.ClientContext($Url) 
$clientContext.Credentials = $spoCredentials 

If ($clientContext.ServerObjectIsNull.Value) { 
    Write-Error "Could not connect to SharePoint Online site collection: $Url"
} Else {
    Write-Host "Connected to SharePoint Online site collection: " $Url -ForegroundColor Green

    $web = $clientContext.Web
    getWeb($web)
}