1. 8.3.x core/lib/Drupal/Core/Render/Element/Radios.php Radios
  2. 8.0.x core/lib/Drupal/Core/Render/Element/Radios.php Radios
  3. 8.1.x core/lib/Drupal/Core/Render/Element/Radios.php Radios
  4. 8.2.x core/lib/Drupal/Core/Render/Element/Radios.php Radios
  5. 8.4.x core/lib/Drupal/Core/Render/Element/Radios.php Radios

Provides a form element for a set of radio buttons.


  • #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:

$form['settings']['active'] = array(
  '#type' => 'radios',
  '#title' => $this->t('Poll status'),
  '#default_value' => 1,
  '#options' => array(0 => $this->t('Closed'), 1 => $this->t('Active')),

Plugin annotation



Expanded class hierarchy of Radios

See also




1 file declares its use of Radios
views_ui.theme.inc in core/modules/views_ui/views_ui.theme.inc
Preprocessors and theme functions for the Views UI.
3 string references to 'Radios'
FilterPluginBase::buildExposedFiltersGroupForm in core/modules/views/src/Plugin/views/filter/FilterPluginBase.php
Build the form to let users create the group of exposed filters. This form is displayed when users click on button 'Build group'
FormTestCheckboxesRadiosForm::buildForm in core/modules/system/tests/modules/form_test/src/Form/FormTestCheckboxesRadiosForm.php
Form constructor.
FormTestValidateRequiredForm::buildForm in core/modules/system/tests/modules/form_test/src/Form/FormTestValidateRequiredForm.php
Form constructor.
66 #type uses of Radios
AccountForm::form in core/modules/user/src/AccountForm.php
Gets the actual form array to be built.
AccountSettingsForm::buildForm in core/modules/user/src/AccountSettingsForm.php
Form constructor.
ArgumentPluginBase::buildOptionsForm in core/modules/views/src/Plugin/views/argument/ArgumentPluginBase.php
Provide a form to edit options for this plugin.
ArgumentPluginBase::defaultSummaryForm in core/modules/views/src/Plugin/views/argument/ArgumentPluginBase.php
Provide a form for selecting further summary options when the default action is set to display one.
Attachment::buildOptionsForm in core/modules/views/src/Plugin/views/display/Attachment.php
Provide the default form for setting options.

... See full list


core/lib/Drupal/Core/Render/Element/Radios.php, line 31


View source
class Radios extends FormElement {

  use CompositeFormElementTrait;

   * {@inheritdoc}
  public function getInfo() {
    $class = get_class($this);
    return array(
      '#input' => TRUE,
      '#process' => array(
        array($class, 'processRadios'),
      '#theme_wrappers' => array('radios'),
      '#pre_render' => array(
        array($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;

        $element += array($key => array());
        // 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'], array($key));
        $element[$key] += array(
          '#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;



Contains filters are case sensitive
Namesort descending Modifiers Type Description
CompositeFormElementTrait::preRenderCompositeFormElement public static function Adds form element theming to an element if its title or description is set.
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function Prevents serializing any properties.
DependencySerializationTrait::__wakeup public function
FormElement::processAutocomplete public static function Adds autocomplete functionality to elements.
FormElement::processPattern public static function #process callback for #pattern form element property.
FormElement::validatePattern public static function #element_validate callback for #pattern form element property.
PluginBase::$configuration protected property Configuration information passed into the plugin.
PluginBase::$pluginDefinition protected property The plugin implementation definition.
PluginBase::$pluginId protected property The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR constant A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId public function Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId public function Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition public function Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition
PluginBase::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::__construct public function Constructs a Drupal\Component\Plugin\PluginBase object.
Radios::getInfo public function Returns the element properties for this element. Overrides ElementInterface::getInfo
Radios::processRadios public static function Expands a radios element into individual radio elements.
Radios::valueCallback public static function Determines how user input is mapped to an element's #value property. Overrides FormElement::valueCallback
RenderElement::preRenderAjaxForm public static function Adds Ajax information about an element to communicate with JavaScript.
RenderElement::preRenderGroup public static function Adds members of this group as actual elements for rendering.
RenderElement::processAjaxForm public static function Form element processing handler for the #ajax form property.
RenderElement::processGroup public static function Arranges elements into groups.
RenderElement::setAttributes public static function Sets a form element's class attribute. Overrides ElementInterface::setAttributes
StringTranslationTrait::$stringTranslation protected property The string translation service.
StringTranslationTrait::formatPlural protected function Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals protected function Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation protected function Gets the string translation service.
StringTranslationTrait::setStringTranslation public function Sets the string translation service to use.
StringTranslationTrait::t protected function Translates a string to the current language or to a given language.