1. 8.5.x core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php StringItem
  2. 8.0.x core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php StringItem
  3. 8.1.x core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php StringItem
  4. 8.2.x core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php StringItem
  5. 8.3.x core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php StringItem
  6. 8.4.x core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php StringItem
  7. 8.6.x core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php StringItem

Defines the 'string' entity field type.

Plugin annotation

  id = "string",
  label = @Translation("Text (plain)"),
  description = @Translation("A field containing a plain string value."),
  category = @Translation("Text"),
  default_widget = "string_textfield",
  default_formatter = "string"


Expanded class hierarchy of StringItem

2 files declare their use of StringItem


core/lib/Drupal/Core/Field/Plugin/Field/FieldType/StringItem.php, line 22


View source
class StringItem extends StringItemBase {

   * {@inheritdoc}
  public static function defaultStorageSettings() {
    return array(
      'max_length' => 255,
      'is_ascii' => FALSE,
    ) + parent::defaultStorageSettings();

   * {@inheritdoc}
  public static function schema(FieldStorageDefinitionInterface $field_definition) {
    return array(
      'columns' => array(
        'value' => array(
          'type' => $field_definition
            ->getSetting('is_ascii') === TRUE ? 'varchar_ascii' : 'varchar',
          'length' => (int) $field_definition
          'binary' => $field_definition

   * {@inheritdoc}
  public function getConstraints() {
    $constraints = parent::getConstraints();
    if ($max_length = $this
      ->getSetting('max_length')) {
      $constraint_manager = \Drupal::typedDataManager()
      $constraints[] = $constraint_manager
        ->create('ComplexData', array(
        'value' => array(
          'Length' => array(
            'max' => $max_length,
            'maxMessage' => t('%name: may not be longer than @max characters.', array(
              '%name' => $this
              '@max' => $max_length,
    return $constraints;

   * {@inheritdoc}
  public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
    $random = new Random();
    $values['value'] = $random
      ->word(mt_rand(1, $field_definition
    return $values;

   * {@inheritdoc}
  public function storageSettingsForm(array &$form, FormStateInterface $form_state, $has_data) {
    $element = array();
    $element['max_length'] = array(
      '#type' => 'number',
      '#title' => t('Maximum length'),
      '#default_value' => $this
      '#required' => TRUE,
      '#description' => t('The maximum length of the field in characters.'),
      '#min' => 1,
      '#disabled' => $has_data,
    return $element;



Contains filters are case sensitive
Namesort descending Modifiers Type Description Overrides
FieldItemBase::calculateDependencies public static function Calculates dependencies for field items. Overrides FieldItemInterface::calculateDependencies
FieldItemBase::calculateStorageDependencies public static function Calculates dependencies for field items on the storage level. Overrides FieldItemInterface::calculateStorageDependencies
FieldItemBase::defaultFieldSettings public static function Defines the field-level settings for this plugin. Overrides FieldItemInterface::defaultFieldSettings
FieldItemBase::delete public function Defines custom delete behavior for field values. Overrides FieldItemInterface::delete
FieldItemBase::deleteRevision public function Defines custom revision delete behavior for field values. Overrides FieldItemInterface::deleteRevision
FieldItemBase::fieldSettingsForm public function Returns a form for the field-level settings. Overrides FieldItemInterface::fieldSettingsForm
FieldItemBase::fieldSettingsFromConfigData public static function Returns a settings array in the field type's canonical representation. Overrides FieldItemInterface::fieldSettingsFromConfigData
FieldItemBase::fieldSettingsToConfigData public static function Returns a settings array that can be stored as a configuration value. Overrides FieldItemInterface::fieldSettingsToConfigData
FieldItemBase::getEntity public function Gets the entity that field belongs to. Overrides FieldItemInterface::getEntity
FieldItemBase::getFieldDefinition public function Gets the field definition. Overrides FieldItemInterface::getFieldDefinition
FieldItemBase::getLangcode public function Gets the langcode of the field values held in the object. Overrides FieldItemInterface::getLangcode
FieldItemBase::getSetting protected function Returns the value of a field setting.
FieldItemBase::getSettings protected function Returns the array of field settings.
FieldItemBase::mainPropertyName public static function Returns the name of the main property, if any. Overrides FieldItemInterface::mainPropertyName
FieldItemBase::onDependencyRemoval public static function Informs the plugin that a dependency of the field will be deleted. Overrides FieldItemInterface::onDependencyRemoval
FieldItemBase::postSave public function Defines custom post-save behavior for field values. Overrides FieldItemInterface::postSave
FieldItemBase::preSave public function Defines custom presave behavior for field values. Overrides FieldItemInterface::preSave
FieldItemBase::setValue public function Overrides \Drupal\Core\TypedData\TypedData::setValue(). Overrides Map::setValue
FieldItemBase::storageSettingsFromConfigData public static function Returns a settings array in the field type's canonical representation. Overrides FieldItemInterface::storageSettingsFromConfigData
FieldItemBase::storageSettingsToConfigData public static function Returns a settings array that can be stored as a configuration value. Overrides FieldItemInterface::storageSettingsToConfigData
FieldItemBase::view public function Returns a renderable array for a single field item. Overrides FieldItemInterface::view
FieldItemBase::writePropertyValue protected function Different to the parent Map class, we avoid creating property objects as far as possible in order to optimize performance. Thus we just update $this->values if no property object has been created yet. Overrides Map::writePropertyValue
FieldItemBase::__construct public function Constructs a TypedData object given its definition and context. Overrides TypedData::__construct
FieldItemBase::__get public function Magic method: Gets a property value. Overrides FieldItemInterface::__get
FieldItemBase::__isset public function Magic method: Determines whether a property is set. Overrides FieldItemInterface::__isset
FieldItemBase::__set public function Magic method: Sets a property value. Overrides FieldItemInterface::__set
FieldItemBase::__unset public function Magic method: Unsets a property. Overrides FieldItemInterface::__unset
Map::$definition protected property The data definition. Overrides TypedData::$definition
Map::$properties protected property The array of properties.
Map::$values protected property An array of values for the contained properties.
Map::applyDefaultValue public function Applies the default value. Overrides TypedData::applyDefaultValue
Map::get public function Gets a property object. Overrides ComplexDataInterface::get
Map::getIterator public function
Map::getProperties public function Gets an array of property objects. Overrides ComplexDataInterface::getProperties
Map::getString public function Returns a string representation of the data. Overrides TypedData::getString
Map::getValue public function Gets the data value. Overrides TypedData::getValue
Map::onChange public function Overrides TraversableTypedDataInterface::onChange
Map::set public function Sets a property value. Overrides ComplexDataInterface::set
Map::toArray public function Returns an array of all property values. Overrides ComplexDataInterface::toArray
Map::__clone public function Magic method: Implements a deep clone.
StringItem::defaultStorageSettings public static function Defines the storage-level settings for this plugin. Overrides StringItemBase::defaultStorageSettings
StringItem::generateSampleValue public static function Generates placeholder field values. Overrides FieldItemBase::generateSampleValue
StringItem::getConstraints public function Gets a list of validation constraints. Overrides TypedData::getConstraints
StringItem::schema public static function Returns the schema for the field. Overrides FieldItemInterface::schema
StringItem::storageSettingsForm public function Returns a form for the storage-level settings. Overrides FieldItemBase::storageSettingsForm
StringItemBase::isEmpty public function Determines whether the data structure is empty. Overrides Map::isEmpty
StringItemBase::propertyDefinitions public static function Defines field item properties. Overrides FieldItemInterface::propertyDefinitions
StringTranslationTrait::$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.
TypedData::$name protected property The property name.
TypedData::$parent protected property The parent typed data object.
TypedData::createInstance public static function Constructs a TypedData object given its definition and context. Overrides TypedDataInterface::createInstance
TypedData::getDataDefinition public function Gets the data definition. Overrides TypedDataInterface::getDataDefinition
TypedData::getName public function Returns the name of a property or item. Overrides TypedDataInterface::getName
TypedData::getParent public function Returns the parent data structure; i.e. either complex data or a list. Overrides TypedDataInterface::getParent
TypedData::getPluginDefinition public function Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition
TypedData::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
TypedData::getPropertyPath public function Returns the property path of the data. Overrides TypedDataInterface::getPropertyPath
TypedData::getRoot public function Returns the root of the typed data tree. Overrides TypedDataInterface::getRoot
TypedData::setContext public function Sets the context of a property or item via a context aware parent. Overrides TypedDataInterface::setContext
TypedData::validate public function Validates the currently set data value. Overrides TypedDataInterface::validate
TypedData::__sleep public function
TypedDataTrait::$typedDataManager protected property The typed data manager used for creating the data types.
TypedDataTrait::getTypedDataManager public function Gets the typed data manager.
TypedDataTrait::setTypedDataManager public function Sets the typed data manager.