Book Image

Drupal 10 Development Cookbook - Third Edition

By : Matt Glaman, Kevin Quillen
Book Image

Drupal 10 Development Cookbook - Third Edition

By: Matt Glaman, Kevin Quillen

Overview of this book

This new and improved third edition cookbook is packed with the latest Drupal 10 features such as a new, flexible default frontend theme - Olivero, and improved administrative experience with a new theme - Claro. This comprehensive recipe book provides updated content on the WYSIWYG (What You See Is What You Get) editing experience, improved core code performance, and code cleanup. Drupal 10 Development Cookbook begins by helping you create and manage a Drupal site. Next, you’ll get acquainted with configuring the content structure and editing content. You’ll also get to grips with all new updates of this edition, such as creating custom pages, accessing and working with entities, running and writing tests with Drupal, migrating external data into Drupal, and turning Drupal into an API platform. As you advance, you’ll learn how to customize Drupal’s features with out-of-the-box modules, contribute extensions, and write custom code to extend Drupal. By the end of this book, you’ll be able to create and manage Drupal sites, customize them to your requirements, and build custom code to deliver your projects.
Table of Contents (17 chapters)

Creating a custom form and saving configuration changes

In this recipe, we will create a form that allows saving the company name and phone number for the website to the configuration. Forms are defined as classes that implement \Drupal\Core\Form\FormInterface. \Drupal\Core\Form\FormBase serves as a standard base class for forms. We will extend this class to create a new form that saves the custom configuration.

How to do it…

  1. First, we need to create the src/Form directory in the module’s directory. We will put our form class in this directory, which gives our form class the Form namespace:
    mkdir -p src/Form
  2. Create a file named CompanyForm.php in the Form directory. This will hold our CompanyForm form class.
  3. Our CompanyForm class will extend the FormBase class provided by Drupal core:
    <?php
    namespace Drupal\mymodule\Form;
    use Drupal\Core\Form\FormBase;
    use Drupal\Core\Form\FormStateInterface;
    class CompanyForm extends FormBase {
      public function...