How do I start an empty breadcrumb?

Question

I am modifying a module that extends PathBasedBreadcrumbBuilder, but that only has methods to add a link at the end of the bread and I want in certain cases to start the breadcrumb from scratch or add a link at the beginning of the breadcrumbs.

How can I do this?

Answer 1

I'm looking at this documentation and I think it says that you could start from scratch using:

$breadcrumb = new Breadcrumb();

And the class:

use Drupal\Core\Breadcrumb\Breadcrumb 

Answer 2

In your custom PathBasedBreadcrumbBuilder, you have to return true in the applies() method and additionally return your new Breadcrumb object in the build() method.

And you need this import

use Drupal\Core\Breadcrumb\Breadcrumb;

And in the services.yml of your module you must register the breadcrumb_builder plugin like so:

  preosasde.breadcrumb:
    class: Drupal\preosasde\PreosAsdeBreadcrumben
    arguments: ["@proreosservice", "@request_stack"]
    tags:
      - { name: breadcrumb_builder, priority: 100 }