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<?php
namespace Drupal\form_test\Form;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
class FormTestValidateRequiredForm extends FormBase {
public function getFormId() {
return 'form_test_validate_required_form';
}
public function buildForm(array $form, FormStateInterface $form_state) {
$options = array(
'foo' => 'foo',
'bar' => 'bar',
);
$validate = array(
'::elementValidateRequired',
);
$form['textfield'] = array(
'#type' => 'textfield',
'#title' => 'Name',
'#required' => TRUE,
'#required_error' => t('Please enter a name.'),
);
$form['checkboxes'] = array(
'#type' => 'checkboxes',
'#title' => 'Checkboxes',
'#options' => $options,
'#required' => TRUE,
'#form_test_required_error' => t('Please choose at least one option.'),
'#element_validate' => $validate,
);
$form['select'] = array(
'#type' => 'select',
'#title' => 'Select',
'#options' => $options,
'#required' => TRUE,
'#form_test_required_error' => t('Please select something.'),
'#element_validate' => $validate,
);
$form['radios'] = array(
'#type' => 'radios',
'#title' => 'Radios',
'#options' => $options,
'#required' => TRUE,
);
$form['radios_optional'] = array(
'#type' => 'radios',
'#title' => 'Radios (optional)',
'#options' => $options,
);
$form['radios_optional_default_value_false'] = array(
'#type' => 'radios',
'#title' => 'Radios (optional, with a default value of FALSE)',
'#options' => $options,
'#default_value' => FALSE,
);
$form['actions'] = array(
'#type' => 'actions',
);
$form['actions']['submit'] = array(
'#type' => 'submit',
'#value' => 'Submit',
);
return $form;
}
public function elementValidateRequired($element, FormStateInterface $form_state) {
if (!empty($element['#required_but_empty']) && isset($element['#form_test_required_error'])) {
$form_state
->setError($element, $element['#form_test_required_error']);
}
}
public function submitForm(array &$form, FormStateInterface $form_state) {
drupal_set_message('The form_test_validate_required_form form was submitted successfully.');
}
}