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<?php
namespace Drupal\Core\Render\Element;
use Drupal\Core\Render\Element;
/**
* Provides a render element for a details element, similar to a fieldset.
*
* Fieldsets can only be used in forms, while details elements can be used
* outside of forms. Users click on the title to open or close the details
* element, showing or hiding the contained elements.
*
* Properties:
* - #title: The title of the details container. Defaults to "Details".
* - #open: Indicates whether the container should be open by default.
* Defaults to FALSE.
*
* Usage example:
* @code
* $form['author'] = array(
* '#type' => 'details',
* '#title' => $this->t('Author'),
* );
*
* $form['author']['name'] = array(
* '#type' => 'textfield',
* '#title' => $this->t('Name'),
* );
* @endcode
*
* @see \Drupal\Core\Render\Element\Fieldset
* @see \Drupal]Core\Render\Element\VerticalTabs
*
* @RenderElement("details")
*/
class Details extends RenderElement {
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = get_class($this);
return [
'#open' => FALSE,
'#value' => NULL,
'#process' => [
[$class, 'processGroup'],
[$class, 'processAjaxForm'],
],
'#pre_render' => [
[$class, 'preRenderDetails'],
[$class, 'preRenderGroup'],
],
'#theme_wrappers' => ['details'],
];
}
/**
* Adds form element theming to details.
*
* @param $element
* An associative array containing the properties and children of the
* details.
*
* @return
* The modified element.
*/
public static function preRenderDetails($element) {
Element::setAttributes($element, ['id']);
// The .js-form-wrapper class is required for #states to treat details like
// containers.
static::setAttributes($element, ['js-form-wrapper', 'form-wrapper']);
// Collapsible details.
$element['#attached']['library'][] = 'core/drupal.collapse';
// Open the detail if specified or if a child has an error.
if (!empty($element['#open']) || !empty($element['#children_errors'])) {
$element['#attributes']['open'] = 'open';
}
// Do not render optional details elements if there are no children.
if (isset($element['#parents'])) {
$group = implode('][', $element['#parents']);
if (!empty($element['#optional']) && !Element::getVisibleChildren($element['#groups'][$group])) {
$element['#printed'] = TRUE;
}
}
return $element;
}
}