Drupal 8 Module Development

Field formatter

Alright, so our field now also has a widget that users can input data with. We can already use this field if we want, but when viewing the nodes, we have no way of displaying the field data, unless we do some custom preprocessing and retrieve it manually as we’ve seen earlier in the book. So, let's instead create the default field formatter because even if we don't need one, it's still a good practice to have one in place to make the field whole.

Before actually coding it, let's establish what we want our formatter to look and behave like. By default, we want the license plate data to be rendered like this:

 <span class="license-plate--code">{{ code }}</span> <span class="license-plate--number">{{ number }}</span>

So, each ...