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 take a look at 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...