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class ImageButton in Drupal 8

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

Provides a form element for a submit button with an image.

Plugin annotation

@FormElement("image_button");

Hierarchy

Expanded class hierarchy of ImageButton

3 #type uses of ImageButton
AjaxFormsTestImageButtonForm::buildForm in core/modules/system/tests/modules/ajax_forms_test/src/Form/AjaxFormsTestImageButtonForm.php
Form constructor.
EntityDisplayFormBase::buildFieldRow in core/modules/field_ui/src/Form/EntityDisplayFormBase.php
Builds the table row structure for a single field.
FormTestDisabledElementsForm::buildForm in core/modules/system/tests/modules/form_test/src/Form/FormTestDisabledElementsForm.php
Form constructor.

File

core/lib/Drupal/Core/Render/Element/ImageButton.php, line 13

Namespace

Drupal\Core\Render\Element
View source 
class ImageButton extends Submit {

  /**
   * {@inheritdoc}
   */
  public function getInfo() {
    $info = parent::getInfo();
    unset($info['name']);
    return [
      '#return_value' => TRUE,
      '#has_garbage_value' => TRUE,
      '#src' => NULL,
      '#theme_wrappers' => [
        'input__image_button',
      ],
    ] + $info;
  }

  /**
   * {@inheritdoc}
   */
  public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
    if ($input !== FALSE) {
      if (!empty($input)) {

        // If we're dealing with Mozilla or Opera, we're lucky. It will
        // return a proper value, and we can get on with things.
        return $element['#return_value'];
      }
      else {

        // Unfortunately, in IE we never get back a proper value for THIS
        // form element. Instead, we get back two split values: one for the
        // X and one for the Y coordinates on which the user clicked the
        // button. We'll find this element in the #post data, and search
        // in the same spot for its name, with '_x'.
        $input = $form_state
          ->getUserInput();
        foreach (explode('[', $element['#name']) as $element_name) {

          // chop off the ] that may exist.
          if (substr($element_name, -1) == ']') {
            $element_name = substr($element_name, 0, -1);
          }
          if (!isset($input[$element_name])) {
            if (isset($input[$element_name . '_x'])) {
              return $element['#return_value'];
            }
            return NULL;
          }
          $input = $input[$element_name];
        }
        return $element['#return_value'];
      }
    }
  }

  /**
   * {@inheritdoc}
   */
  public static function preRenderButton($element) {
    $element['#attributes']['type'] = 'image';
    Element::setAttributes($element, [
      'id',
      'name',
      'value',
    ]);
    $element['#attributes']['src'] = file_url_transform_relative(file_create_url($element['#src']));
    if (!empty($element['#title'])) {
      $element['#attributes']['alt'] = $element['#title'];
      $element['#attributes']['title'] = $element['#title'];
    }
    $element['#attributes']['class'][] = 'image-button';
    if (!empty($element['#button_type'])) {
      $element['#attributes']['class'][] = 'image-button--' . $element['#button_type'];
    }
    $element['#attributes']['class'][] = 'js-form-submit';
    $element['#attributes']['class'][] = 'form-submit';
    if (!empty($element['#attributes']['disabled'])) {
      $element['#attributes']['class'][] = 'is-disabled';
    }
    return $element;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
Button::processButton public static function Processes a form button element.
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.
ImageButton::getInfo public function Returns the element properties for this element. Overrides Submit::getInfo
ImageButton::preRenderButton public static function Prepares a #type 'button' render element for input.html.twig. Overrides Button::preRenderButton
ImageButton::valueCallback public static function Determines how user input is mapped to an element's #value property. Overrides FormElement::valueCallback
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.