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<?php
namespace Drupal\Core\Render\Element;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Component\Utility\Html as HtmlUtility;
/**
* Provides a form element for a set of radio buttons.
*
* Properties:
* - #options: An associative array, where the keys are the returned values for
* each radio button, and the values are the labels next to each radio button.
*
* Usage example:
* @code
* $form['settings']['active'] = array(
* '#type' => 'radios',
* '#title' => $this->t('Poll status'),
* '#default_value' => 1,
* '#options' => array(0 => $this->t('Closed'), 1 => $this->t('Active')),
* );
* @endcode
*
* @see \Drupal\Core\Render\Element\Checkboxes
* @see \Drupal\Core\Render\Element\Radio
* @see \Drupal\Core\Render\Element\Select
*
* @FormElement("radios")
*/
class Radios extends FormElement {
use CompositeFormElementTrait;
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = get_class($this);
return [
'#input' => TRUE,
'#process' => [
[$class, 'processRadios'],
],
'#theme_wrappers' => ['radios'],
'#pre_render' => [
[$class, 'preRenderCompositeFormElement'],
],
];
}
/**
* Expands a radios element into individual radio elements.
*/
public static function processRadios(&$element, FormStateInterface $form_state, &$complete_form) {
if (count($element['#options']) > 0) {
$weight = 0;
foreach ($element['#options'] as $key => $choice) {
// Maintain order of options as defined in #options, in case the element
// defines custom option sub-elements, but does not define all option
// sub-elements.
$weight += 0.001;
$element += [$key => []];
// Generate the parents as the autogenerator does, so we will have a
// unique id for each radio button.
$parents_for_id = array_merge($element['#parents'], [$key]);
$element[$key] += [
'#type' => 'radio',
'#title' => $choice,
// The key is sanitized in Drupal\Core\Template\Attribute during output
// from the theme function.
'#return_value' => $key,
// Use default or FALSE. A value of FALSE means that the radio button is
// not 'checked'.
'#default_value' => isset($element['#default_value']) ? $element['#default_value'] : FALSE,
'#attributes' => $element['#attributes'],
'#parents' => $element['#parents'],
'#id' => HtmlUtility::getUniqueId('edit-' . implode('-', $parents_for_id)),
'#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
// Errors should only be shown on the parent radios element.
'#error_no_message' => TRUE,
'#weight' => $weight,
];
}
}
return $element;
}
/**
* {@inheritdoc}
*/
public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
if ($input !== FALSE) {
// When there's user input (including NULL), return it as the value.
// However, if NULL is submitted, FormBuilder::handleInputElement() will
// apply the default value, and we want that validated against #options
// unless it's empty. (An empty #default_value, such as NULL or FALSE, can
// be used to indicate that no radio button is selected by default.)
if (!isset($input) && !empty($element['#default_value'])) {
$element['#needs_validation'] = TRUE;
}
return $input;
}
else {
// For default value handling, simply return #default_value. Additionally,
// for a NULL default value, set #has_garbage_value to prevent
// FormBuilder::handleInputElement() converting the NULL to an empty
// string, so that code can distinguish between nothing selected and the
// selection of a radio button whose value is an empty string.
$value = isset($element['#default_value']) ? $element['#default_value'] : NULL;
if (!isset($value)) {
$element['#has_garbage_value'] = TRUE;
}
return $value;
}
}
}