I'm trying to use the ThemeNegotiator to change the theme of the add and edit pages of one content type. I've followed the following very extensive posts/blogs.

Don't use admin theme for adding editing specific content type

Dynamic theme switching in Drupal 8

Soft launching your new drupal theme

Choose your theme dynamically Drupal 8

I have a user that is allowed to see the Admin theme seven, but for one content type documenten I want him to see the front-end theme svds. I'm able to get this to work for front-end pages but not for admin pages. What I think is that the applies part doesn't match on the add and edit pages. So it doesn't know it's on a documenten content type. Does anyone has an idea on how to solve this?

Module structure:



name: Theme Switcher
type: module
description: 'Switch theme for specific Content Type'
package: SVDS
core: 8.x


        class: Drupal\theme_switcher\Theme\SwitcherNegotiator
          - { name: theme_negotiator, priority: -50 }


 * @file
 * Contains \Drupal\theme_switcher\Theme\SwitcherNegotiator

namespace Drupal\theme_switcher\Theme;

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Theme\ThemeNegotiatorInterface;

class SwitcherNegotiator implements ThemeNegotiatorInterface
     * {@inheritdoc}
    public function applies(RouteMatchInterface $route_match)
        // Use this theme on a certain route.
        $node = $route_match->getParameter('node');
        if (!is_null($node) && $node instanceof \Drupal\node\Entity\Node) {
            return $node->getType() == 'documenten';

        // apply default theme
        return false;

     * {@inheritdoc}
    public function determineActiveTheme(RouteMatchInterface $route_match)
        // Here you return the actual theme name.
        return 'svds';

1 Answer 1


The admin theme negotiator is tagged with a priority of -40:


    class: Drupal\user\Theme\AdminNegotiator
    arguments: ['@current_user', '@config.factory', '@entity_type.manager', '@router.admin_context']
      - { name: theme_negotiator, priority: -40 }

So you have to use at least -39, since the first negotiator returning a theme name wins and on an admin page this core service will return the admin theme.

  • Thanks for the quick reply, this solves the problem when editing a node. But not when adding one. So /node/add/documenten still shows the admin theme.
    – Joost
    Commented May 22, 2019 at 19:51
  • That's a different route /node/add/{node_type}, so you have to check for the node type as route parameter.
    – 4uk4
    Commented May 22, 2019 at 20:21
  • See drupal.stackexchange.com/a/249297/47547 for a code example which covers both cases.
    – 4uk4
    Commented May 23, 2019 at 8:56
  • Just what I needed! Thanks.
    – Joost
    Commented May 23, 2019 at 14:24

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