Defining contextual links

Contextual links are a bit more complicated than the other types of links we’ve seen before, but nothing is too challenging for us. Let’s see how we can add contextual links to our salutation component so that users can navigate to the configuration form via a contextual link.

First, we will need to create the *.links.contextual.yml file and define the link:

hello_world.override:
  title: 'Override'
  route_name: hello_world.greeting_form
  group: hello_world

Nothing too complicated here. Again, we have a title link and a route_name. Additionally, we have a group key, which indicates the group name that this link will be a part of. We will reference this later.

Next, we will need to alter our theme hook template file because the contextual links are printed in a title_suffix variable that is available in all theme hooks and is used by various modules to add miscellaneous data to templates. The...