Select

Provides a form element for a drop-down menu or scrolling selection box.

Properties:

  • #options: An associative array, where the keys are the values for each option, and the values are the option labels to be shown in the drop-down list. If a value is an array, it will be rendered similarly, but as an optgroup. The key of the sub-array will be used as the label for the optgroup. Nesting optgroups is not allowed.
  • #empty_option: The label that will be displayed to denote no selection.
  • #empty_value: The value of the option that is used to denote no selection.

Usage example:

$form['example_select'] = [
  '#type' => 'select',
  '#title' => $this->t('Select element'),
  '#options' => [
    '1' => $this->t('One'),
    '2' => [
      '2.1' => $this->t('Two point one'),
      '2.2' => $this->t('Two point two'),
    ],
    '3' => $this->t('Three'),
  ],
];

Plugin annotation

@FormElement("select")

Hierarchy

File

core/lib/Drupal/Core/Render/Element/Select.php, line 38

Namespace

Drupal\Core\Render\Element

Members

Name Modifiers Type Description
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function
DependencySerializationTrait::__wakeup public function
FormElement::processAutocomplete public static function Adds autocomplete functionality to elements.
FormElement::processPattern public static function #process callback for #pattern form element property.
FormElement::validatePattern public static function #element_validate callback for #pattern form element property.
PluginBase::$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.
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
Select::getInfo public function Returns the element properties for this element. Overrides ElementInterface::getInfo
Select::preRenderSelect public static function Prepares a select render element.
Select::processSelect public static function Processes a select list form element.
Select::valueCallback public static function Determines how user input is mapped to an element's #value property. Overrides FormElement::valueCallback
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.
doc_Drupal
2016-10-29 09:41:05
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