The document provides an overview of the Form API in Drupal 8, highlighting its object-oriented features. It includes the definition of example forms and their respective methods such as buildForm, validateForm, and submitForm. Additionally, it demonstrates how to implement a configuration form using the Form API.

1. Form API – Drupal 8
Крайнюк Михаил

2. Drupal 8 – объектно-ориентирован.
Form API теперь тоже…

3. <?php
/**
* @file
* Contains DrupalExampleFormExampleForm.
*/
namespace DrupalexampleForm;
use DrupalCoreFormFormInterface;
/**
* Provides a simple example form.
*/
class ExampleForm implements FormInterface {
}
public function getFormID()
public function buildForm(array $form, array &$form_state)
public function validateForm(array &$form, array &$form_state)
public function submitForm(array &$form, array &$form_state)

4. public function buildForm(array $form, array &$form_state) {
$form['my_text_field'] = array(
'#type' => 'textfield',
'#title' => 'Example',
);
return $form;
}
Form Builder

5. public function validateForm(array $form, FormStateInterface &$form_state) {
if (strlen($form_state->getValue('phone_number')) < 3) {
$form_state->setErrorByName('phone_number', $this->t('The phone number is too short.'));
}
}
Form Validate

6. use DrupalsystemSystemConfigFormBase;
class ExampleConfigForm extends SystemConfigFormBase {
/**
* Implements DrupalCoreFormFormInterface::getFormID().
*/
public function getFormID() {
return 'example_systemconfigformbase';
}
/**
* Implements DrupalCoreFormFormInterface::buildForm().
*/
public function buildForm(array $form, array &$form_state) {
$form = parent::buildForm($form, $form_state);
// Use the Form API to define form elements.
return $form;
}
…
system_settings_form()

7. Спасибо!
Крайнюк Михаил
kraynuk.m@i20.biz