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<?php
namespace Drupal\form_api_example\Form;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
class MultistepForm extends FormBase {
public function getFormId() {
return 'form_api_example_multistep_form';
}
public function buildForm(array $form, FormStateInterface $form_state) {
if ($form_state
->has('page_num') && $form_state
->get('page_num') == 2) {
return self::fapiExamplePageTwo($form, $form_state);
}
$form_state
->set('page_num', 1);
$form['description'] = [
'#type' => 'item',
'#title' => $this
->t('A basic multistep form (page 1)'),
];
$form['first_name'] = [
'#type' => 'textfield',
'#title' => $this
->t('First Name'),
'#description' => $this
->t('Enter your first name.'),
'#default_value' => $form_state
->getValue('first_name', ''),
'#required' => TRUE,
];
$form['last_name'] = [
'#type' => 'textfield',
'#title' => $this
->t('Last Name'),
'#default_value' => $form_state
->getValue('last_name', ''),
'#description' => $this
->t('Enter your last name.'),
];
$form['birth_year'] = [
'#type' => 'number',
'#title' => $this
->t('Birth Year'),
'#default_value' => $form_state
->getValue('birth_year', ''),
'#description' => $this
->t('Format is "YYYY" and value between 1900 and 2000'),
];
$form['actions'] = [
'#type' => 'actions',
];
$form['actions']['next'] = [
'#type' => 'submit',
'#button_type' => 'primary',
'#value' => $this
->t('Next'),
'#submit' => [
'::fapiExampleMultistepFormNextSubmit',
],
'#validate' => [
'::fapiExampleMultistepFormNextValidate',
],
];
return $form;
}
public function submitForm(array &$form, FormStateInterface $form_state) {
$page_values = $form_state
->get('page_values');
$this
->messenger()
->addMessage($this
->t('The form has been submitted. name="@first @last", year of birth=@year_of_birth', [
'@first' => $page_values['first_name'],
'@last' => $page_values['last_name'],
'@year_of_birth' => $page_values['birth_year'],
]));
$this
->messenger()
->addMessage($this
->t('And the favorite color is @color', [
'@color' => $form_state
->getValue('color'),
]));
}
public function fapiExampleMultistepFormNextValidate(array &$form, FormStateInterface $form_state) {
$birth_year = $form_state
->getValue('birth_year');
if ($birth_year != '' && ($birth_year < 1900 || $birth_year > 2000)) {
$form_state
->setErrorByName('birth_year', $this
->t('Enter a year between 1900 and 2000.'));
}
}
public function fapiExampleMultistepFormNextSubmit(array &$form, FormStateInterface $form_state) {
$form_state
->set('page_values', [
'first_name' => $form_state
->getValue('first_name'),
'last_name' => $form_state
->getValue('last_name'),
'birth_year' => $form_state
->getValue('birth_year'),
])
->set('page_num', 2)
->setRebuild(TRUE);
}
public function fapiExamplePageTwo(array &$form, FormStateInterface $form_state) {
$form['description'] = [
'#type' => 'item',
'#title' => $this
->t('A basic multistep form (page 2)'),
];
$form['color'] = [
'#type' => 'textfield',
'#title' => $this
->t('Favorite color'),
'#required' => TRUE,
'#default_value' => $form_state
->getValue('color', ''),
];
$form['back'] = [
'#type' => 'submit',
'#value' => $this
->t('Back'),
'#submit' => [
'::fapiExamplePageTwoBack',
],
'#limit_validation_errors' => [],
];
$form['submit'] = [
'#type' => 'submit',
'#button_type' => 'primary',
'#value' => $this
->t('Submit'),
];
return $form;
}
public function fapiExamplePageTwoBack(array &$form, FormStateInterface $form_state) {
$form_state
->setValues($form_state
->get('page_values'))
->set('page_num', 1)
->setRebuild(TRUE);
}
}