Beginning Drupal 8

Chapter 5 ■ Content Types
Figure 5-17. Adding a list field
The next step in the process is to provide the values that will appear in the list (see Figure 5-18). On this
screen we have to specify the “Allowed values list,” which is the list of options that will be presented to the
author. Drupal requires that options be listed as a “key|label” pair, where key is a value representing which
option that was selected (the key value will be stored in the database), followed by the “pipe” character
(press the Shift key and \ to enter a pipe character), and label is the value that will be displayed on the
screen. In the example in Figure 5-18, I used reserved|Reserved and general|General Admission, resulting
in the values of reserved or general being stored in the database. By setting the “Allowed number of values”
field to “Limited” and “1,” Drupal will render this list as radio buttons, as the user is restricted to selecting
a single value. If the number is greater than 1, Drupal will render this list as check boxes. After entering the
values, click the “Save field settings” button to continue the process.
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