Sharepoint On-premises script injection with Powershell

Inject custom JavaScript file to all pages

I want add script into site without editing master page. Using JavaScript Injection we can easily add our custom script into all pages.

Below PowerShell script to inject custom file to all pages.

Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll"

Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

$SiteURL = "http://dotnetsharepoint.com/sites/PublishingSite/"

　
$actionName = "Lakshmi_JS_INjection"

$actiontype = "ScriptLink"

#Custom Script File

$actionSourceFile ="http://dotnetsharepoint.com/sites/PublishingSite/Documents/Test%20Inject.js"

 $Context =New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)

$web = $Context.Web

$Context.Load($web)

$context.Load($web.Webs)

  $Context.ExecuteQuery()

 if($web)

{ 

 try

  {

#for all subsites
 foreach($web in $web.Webs)

{
    

$actions = $web.get_userCustomActions();

$Context.Load($actions)

$Context.ExecuteQuery()

if($actions)

{

#Delete existing script inject

 foreach($action in $actions)

{

if($action.get_description() -eq $actionName -and $action.get_location() -eq $actionType){

$action.deleteObject()

}

}

}
 $newAction = $actions.add();

$newAction.set_description($actionName);

$newAction.set_location('ScriptLink');

$scriptBlock = 'var headID = document.getElementsByTagName("head")[0];var newScript = document.createElement("script");newScript.type ="text/javascript";newScript.src ="';

$scriptBlock += $actionSourceFile + '?ver=' +(Get-Date);

$scriptBlock += '";headID.appendChild(newScript);';

$newAction.set_scriptBlock($scriptBlock);

$newAction.update();

$Context.ExecuteQuery();

Write-Host "Added"

}

}
 catch
  {
 Write-Host "error"

}
}   

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