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class Dropdown in Open Social 10.3.x

Same name in this branch
  1. 10.3.x modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  2. 10.3.x modules/custom/dropdown/src/Plugin/Field/FieldType/Dropdown.php \Drupal\dropdown\Plugin\Field\FieldType\Dropdown
Same name and namespace in other branches
  1. 8.9 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  2. 8 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  3. 8.2 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  4. 8.3 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  5. 8.4 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  6. 8.5 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  7. 8.6 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  8. 8.7 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  9. 8.8 modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  10. 10.0.x modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  11. 10.1.x modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown
  12. 10.2.x modules/custom/dropdown/src/Element/Dropdown.php \Drupal\dropdown\Element\Dropdown

Provides an dropdown element.

Plugin annotation

@RenderElement("dropdown");

Hierarchy

Expanded class hierarchy of Dropdown

1 string reference to 'Dropdown'
dropdown.info.yml in modules/custom/dropdown/dropdown.info.yml
modules/custom/dropdown/dropdown.info.yml
1 #type use of Dropdown
DropdownWidgetType::formElement in modules/custom/dropdown/src/Plugin/Field/FieldWidget/DropdownWidgetType.php
Returns the form for a single field widget.

File

modules/custom/dropdown/src/Element/Dropdown.php, line 15

Namespace

Drupal\dropdown\Element
View source
class Dropdown extends FormElement {
  use CompositeFormElementTrait;

  /**
   * {@inheritdoc}
   */
  public function getInfo() {
    $class = get_class($this);
    return [
      '#label' => 'Default Label',
      '#process' => [
        [
          $class,
          'processDropdown',
        ],
      ],
      '#description' => t('Dropdown element.'),
      '#theme_wrappers' => [
        'dropdown',
      ],
      '#pre_render' => [
        [
          $class,
          'preRenderDropdown',
        ],
      ],
    ];
  }

  /**
   * Prepare the render array for the template.
   */
  public static function preRenderDropdown($element) {

    // @todo Attach $element['#attached']['library'][] = 'dropdown';
    return $element;
  }

  /**
   * Expands a radios element into individual radio elements.
   */
  public static function processDropdown(&$element, FormStateInterface $form_state, &$complete_form) {
    if (count($element['#options']) > 0) {
      $weight = 0;
      foreach ($element['#options'] as $key => $option) {
        $value = HtmlUtility::escape($option['value']);
        $label = HtmlUtility::escape($option['label']);
        $description = isset($option['description']) ? HtmlUtility::escape($option['description']) : NULL;

        // 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' => $label,
          '#description' => $description,
          // The key is sanitized in Drupal\Core\Template\Attribute during
          // output from the theme function.
          '#return_value' => $value,
          // Use default or FALSE. A value of FALSE means that the radio button
          // is not 'checked'.
          '#default_value' => isset($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;
    }
  }

}

Members

Namesort descending Modifiers Type Description Overrides
CompositeFormElementTrait::preRenderCompositeFormElement public static function Adds form element theming to an element if its title or description is set.
DependencySerializationTrait::$_entityStorages protected property
DependencySerializationTrait::$_serviceIds protected property
DependencySerializationTrait::__sleep public function 2
DependencySerializationTrait::__wakeup public function 2
Dropdown::getInfo public function Returns the element properties for this element. Overrides ElementInterface::getInfo
Dropdown::preRenderDropdown public static function Prepare the render array for the template.
Dropdown::processDropdown public static function Expands a radios element into individual radio elements.
Dropdown::valueCallback public static function Determines how user input is mapped to an element's #value property. Overrides FormElement::valueCallback
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.
MessengerTrait::$messenger protected property The messenger. 27
MessengerTrait::messenger public function Gets the messenger. 27
MessengerTrait::setMessenger public function Sets the messenger.
PluginBase::$configuration protected property Configuration information passed into the plugin. 1
PluginBase::$pluginDefinition protected property The plugin implementation definition. 1
PluginBase::$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 2
PluginBase::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::isConfigurable public function Determines if the plugin is configurable.
PluginBase::__construct public function Constructs a \Drupal\Component\Plugin\PluginBase object. 98
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. 1
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. 4
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. 2
StringTranslationTrait::t protected function Translates a string to the current language or to a given language.