Apply Alternate CSS to all site collections via Powershell in SharePoint 2013

Question

I have a SharePoint 2013 environment where I want to apply a single Alternate CSS file across all site collections and subsites. I am using the following method. When I run this I receive a single error, the Alternate CSS is applied to all sites and subsites EXCEPT on the root site collection. Any ideas how I can get this to work for the root site collection as well?

$Webapp = Get-SPWebApplication "http://MyServer/"

$Sites = $Webapp.sites.url
foreach ($site in $sites)
{
  $web = Get-SPWeb $site
  $cssurl = "/SiteAssets/DevColorChange.css"
  $web.AlternateCssUrl = $cssurl
  $web.AllProperties["__InheritsAlternateCssUrl"] = $True
  $web.Update()
}

ERROR:

Exception calling "Update" with "0" argument(s): "Specified data type does not match the current data type of the property." At line:10 char:1 + $web.Update() + ~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : SPInvalidPropertyException

Colin · Accepted Answer · 2016-04-07 16:40:55Z

4

Get-SPWebApplication "http://MyServer/" | Get-SPSite -Limit All | Get-SPWeb -Limit All | % { $_.AlternateCssUrl = ($_.Site.Url + "/SiteAssets/DevColorChange.css");$_.Update() }

answered Apr 7, 2016 at 16:40

Colin

4,66519 silver badges26 bronze badges

Thanks! In my case I have a single CSS file located at: MyServer/SiteAssets/DevColorChange.css When I run your command it does make the Alternate CSS changes across all site collections/subsites including the root, however on every site collect EXCEPT the root it points to: MyServer/sites/SITECOLLECTION/SiteAssets/DevColorChange.css Instead of MyServer/SiteAssets/DevColorChange.css Removing $_.Site.Url + from $_.AlternateCssUrl = ($_.Site.Url + "/SiteAssets/DevColorChange.css") Gives me the results I am looking for

Josh Wayman
– Josh Wayman

2016-04-07 17:08:17 +00:00
Commented Apr 7, 2016 at 17:08
True, your URL is a serverrelative URL already ;-)

Colin
– Colin

2016-04-08 13:34:01 +00:00
Commented Apr 8, 2016 at 13:34

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