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class Weight in Drupal 8

Same name and namespace in other branches
  1. 9 core/lib/Drupal/Core/Render/Element/Weight.php \Drupal\Core\Render\Element\Weight

Provides a form element for input of a weight.

Weights are integers used to indicate ordering, with larger numbers later in the order.

Properties:

  • #delta: The range of possible weight values used. A delta of 10 would indicate possible weight values between -10 and 10.

Usage example:

$form['weight'] = array(
  '#type' => 'weight',
  '#title' => $this
    ->t('Weight'),
  '#default_value' => $edit['weight'],
  '#delta' => 10,
);

Plugin annotation

@FormElement("weight");

Hierarchy

Expanded class hierarchy of Weight

1 file declares its use of Weight
WeightTest.php in core/tests/Drupal/KernelTests/Core/Render/Element/WeightTest.php
54 string references to 'Weight'
block.schema.yml in core/modules/block/config/schema/block.schema.yml
core/modules/block/config/schema/block.schema.yml
BlockListBuilder::buildBlocksForm in core/modules/block/src/BlockListBuilder.php
Builds the main "Blocks" portion of the form.
Book::fields in core/modules/book/src/Plugin/migrate/source/Book.php
Returns available fields on the source.
BookAdminEditForm::bookAdminTable in core/modules/book/src/Form/BookAdminEditForm.php
Builds the table portion of the form for the book administration page.
BookManager::addFormElements in core/modules/book/src/BookManager.php
Builds the common elements of the book form for the node and outline forms.

... See full list

24 #type uses of Weight
BlockListBuilder::buildBlocksForm in core/modules/block/src/BlockListBuilder.php
Builds the main "Blocks" portion of the form.
BookAdminEditForm::bookAdminTableTree in core/modules/book/src/Form/BookAdminEditForm.php
Helps build the main table in the book administration page form.
BookManager::addFormElements in core/modules/book/src/BookManager.php
Builds the common elements of the book form for the node and outline forms.
ConfigTestForm::form in core/modules/config/tests/config_test/src/ConfigTestForm.php
Gets the actual form array to be built.
ContactFormEditForm::form in core/modules/contact/src/ContactFormEditForm.php
Gets the actual form array to be built.

... See full list

File

core/lib/Drupal/Core/Render/Element/Weight.php, line 29

Namespace

Drupal\Core\Render\Element
View source
class Weight extends FormElement {

  /**
   * {@inheritdoc}
   */
  public function getInfo() {
    $class = get_class($this);
    return [
      '#input' => TRUE,
      '#delta' => 10,
      '#default_value' => 0,
      '#process' => [
        [
          $class,
          'processWeight',
        ],
        [
          $class,
          'processAjaxForm',
        ],
      ],
    ];
  }

  /**
   * Expands a weight element into a select/number element.
   */
  public static function processWeight(&$element, FormStateInterface $form_state, &$complete_form) {

    // If the number of options is small enough, use a select field. Otherwise,
    // use a number field.
    $type = $element['#delta'] <= \Drupal::config('system.site')
      ->get('weight_select_max') ? 'select' : 'number';
    $element = array_merge($element, \Drupal::service('element_info')
      ->getInfo($type));
    $element['#is_weight'] = TRUE;
    if ($type === 'select') {
      $weights = [];
      for ($n = -1 * $element['#delta']; $n <= $element['#delta']; $n++) {
        $weights[$n] = $n;
      }
      $default_value = (int) $element['#default_value'];
      if (!isset($weights[$default_value])) {
        $weights[$default_value] = $default_value;
        ksort($weights);
      }
      $element['#options'] = $weights;
    }
    else {

      // Use a field big enough to fit most weights.
      $element['#size'] = 10;
    }
    return $element;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
DependencySerializationTrait::$_entityStorages protected property An array of entity type IDs keyed by the property name of their storages.
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function 1
DependencySerializationTrait::__wakeup public function 2
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.
FormElement::valueCallback public static function Determines how user input is mapped to an element's #value property. Overrides FormElementInterface::valueCallback 15
MessengerTrait::$messenger protected property The messenger. 29
MessengerTrait::messenger public function Gets the messenger. 29
MessengerTrait::setMessenger public function Sets the messenger.
PluginBase::$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 3
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. 92
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. 1
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.
Weight::getInfo public function Returns the element properties for this element. Overrides ElementInterface::getInfo
Weight::processWeight public static function Expands a weight element into a select/number element.