class ImageButton in Zircon Profile 8

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

Plugin annotation

@FormElement("image_button");

Hierarchy

• class \Drupal\Component\Plugin\PluginBase implements DerivativeInspectionInterface, PluginInspectionInterface
  • class \Drupal\Core\Plugin\PluginBase uses DependencySerializationTrait, StringTranslationTrait
    • class \Drupal\Core\Render\Element\RenderElement implements ElementInterface
      • class \Drupal\Core\Render\Element\FormElement implements FormElementInterface
        • class \Drupal\Core\Render\Element\Button
          • class \Drupal\Core\Render\Element\Submit
            • class \Drupal\Core\Render\Element\ImageButton

2 #type uses of ImageButton

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 18

Contains \Drupal\Core\Render\Element\ImageButton.

Namespace

Drupal\Core\Render\Element

class ImageButton extends Submit {

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

Name	Modifiers	Type	Description	Overrides
Button::processButton	public static	function	Processes a form button element.
DependencySerializationTrait::$_serviceIds	protected	property	An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep	public	function		1
DependencySerializationTrait::__wakeup	public	function		2
FormElement::processAutocomplete	public static	function	Adds autocomplete functionality to elements.
FormElement::processPattern	public static	function	#process callback for #pattern form element property.
FormElement::validatePattern	public static	function	#element_validate callback for #pattern form element property.
ImageButton::getInfo	public	function	Returns the element properties for this element. Overrides Submit::getInfo
ImageButton::preRenderButton	public static	function	Prepares a #type 'button' render element for input.html.twig. Overrides Button::preRenderButton
ImageButton::valueCallback	public static	function	Determines how user input is mapped to an element's #value property. Overrides FormElement::valueCallback
PluginBase::$configuration	protected	property	Configuration information passed into the plugin.	2
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.	69
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
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.	2
StringTranslationTrait::t	protected	function	Translates a string to the current language or to a given language.