[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")


Function Get-SPOCredentials([string]$UserName,[string]$Password)
{
   if([string]::IsNullOrEmpty($Password)) {
      $SecurePassword = Read-Host -Prompt "Enter the password" -AsSecureString
   }
   else {
      $SecurePassword = $Password | ConvertTo-SecureString -AsPlainText -Force
   }
   return New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($UserName, $SecurePassword)
}

Function Configure-ListView([Microsoft.SharePoint.Client.ClientContext]$Context, [string]$ListTitle,[string]$ViewTitle)
{
    $list = $Context.Web.Lists.GetByTitle($ListTitle)
    $view = $list.Views.GetByTitle($ViewTitle)
    $view.JSLink = "~sitecollection/SiteAssets/Tasks.js"
    $view.Update()
    $Context.Load($view)
    $Context.ExecuteQuery()
}

$UserName = "username@contoso.onmicrosoft.com"
$Password = Read-Host -Prompt "Enter the password"
$WebUrl = "https://contoso.sharepoint.com"


$Context = New-Object Microsoft.SharePoint.Client.ClientContext($WebUrl)
$Context.Credentials = Get-SPOCredentials -UserName $UserName -Password $Password
Configure-ListView -Context $Context -ListTitle "Tasks" -ViewTitle "All Tasks"
$Context.Dispose()