Drupal 8 Custom Plugin Types

Drupal 8 comes with a great addition to the backend developer toolkit in the form of the plugin system. Completely new, specific to Drupal and evolved from serving only a few specific purposes, plugins have become the go-to system for reusable functionality in Drupal 8.

Drupal 8 logo

In this article series of two parts, we will use this system to build a feature that allows the use of custom forms together with node entities. After we’re done, we’ll be able to do the following:

  • configure node bundles to use one of multiple form types to be displayed together with the node display
  • easily define new form types by extending from a sensible base class

Because the topic is very well covered elsewhere, I will not go into the details of how plugins work. But do feel free to brush up on the theory before diving into the crux of it here. And if you want to take a look at the end result, the code we write in both articles can be found in this repository.

We will get started by creating our custom plugin type. To this end, we will have 2 interfaces and 6 classes. It sounds like much, but I assure you they are rather boilerplate and quick to set up. Then, in the next installment of this series, we will see how to use it for our reusable forms attached to nodes.

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