Functions/GenXdev.Queries/Invoke-WebbrowserTabPollingScript.ps1
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<##############################################################################
Part of PowerShell module : GenXdev.Queries Original cmdlet filename : Invoke-WebbrowserTabPollingScript.ps1 Original author : René Vaessen / GenXdev Version : 1.300.2025 ################################################################################ Copyright (c) René Vaessen / GenXdev Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ################################################################################> ############################################################################### <# .SYNOPSIS Executes a background polling script in a previously selected webbrowser tab. .DESCRIPTION Continuously executes JavaScript in a browser tab and processes results through an optional callback. The script runs in a separate thread to prevent blocking. .PARAMETER Scripts JavaScript code, URLs, or file paths to execute in the browser tab. .PARAMETER InitialUrl Optional URL to navigate to before starting the polling process. .PARAMETER Callback Optional scriptblock that processes results after each poll iteration. .EXAMPLE Invoke-WebbrowserTabPollingScript -Scripts "console.log('polling')" ` -InitialUrl "https://example.com" ` -Callback { Write-Host "Polled" } .NOTES Requires Windows 10 or later. #> function Invoke-WebbrowserTabPollingScript { [CmdletBinding()] [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidGlobalVars', '')] [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseUsingScopeModifierInNewRunspaces', '')] param( ####################################################################### [Parameter( Position = 0, Mandatory = $false, HelpMessage = 'JavaScript code, URLs or file paths to execute', ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true )] [Alias('FullName')] [object[]] $Scripts, ####################################################################### [Parameter( Position = 1, Mandatory = $false, HelpMessage = 'URL to navigate to before polling starts' )] [string] $InitialUrl, ####################################################################### [Parameter( Position = 2, Mandatory = $false, HelpMessage = 'Callback scriptblock to process poll results' )] [ScriptBlock] $Callback ####################################################################### ) begin { Microsoft.PowerShell.Utility\Write-Verbose "Starting browser tab polling with $( $Scripts.Count) scripts" # validate scripts parameter if provided if ($Scripts) { foreach ($script in $Scripts) { if ($script -isnot [string]) { throw 'Scripts must be strings containing JavaScript, URLs, or file paths' } } } } process { # initialize thread job to run polling in background $job = ThreadJob\Start-ThreadJob ` -InitializationScript { Microsoft.PowerShell.Core\Import-Module GenXdev.Queries } ` -ScriptBlock { param ($scripts, $reference, $initialUrl, $callback) # initialize global state $global:data = @{ urls = @() query = $Query } # select the target browser tab GenXdev.Webbrowser\Select-WebbrowserTab -ByReference $reference # navigate to initial url if specified if (![string]::IsNullOrWhiteSpace($initialUrl)) { $null = GenXdev.Webbrowser\Invoke-WebbrowserEvaluation ` "document.location.href='$initialUrl'" -NoAutoSelectTab } # start polling loop do { Microsoft.PowerShell.Utility\Start-Sleep -Milliseconds 250 # execute scripts in browser $null = GenXdev.Webbrowser\Invoke-WebbrowserEvaluation ` -Scripts $scripts -NoAutoSelectTab # process results via callback if provided if ($null -ne $callback) { try { Microsoft.PowerShell.Core\Invoke-Command -ScriptBlock $callback ` -ErrorAction SilentlyContinue } catch { Microsoft.PowerShell.Utility\Write-Warning $PSItem.Exception } # reselect browser tab after callback GenXdev.Webbrowser\Select-WebbrowserTab -ByReference $reference } } while ($global:data.more) } -ArgumentList @( $Scripts, (GenXdev.Webbrowser\Get-ChromiumSessionReference), $InitialUrl, $Callback ) $null = Microsoft.PowerShell.Core\Wait-Job -Job $job Microsoft.PowerShell.Core\Receive-Job -Job $job $null = Microsoft.PowerShell.Core\Remove-Job -Job $job Microsoft.PowerShell.Utility\Write-Verbose "Started polling job with ID: $($job.Id)" } end { } } |