public static function Tableselect::preRenderTableselect in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Render/Element/Tableselect.php \Drupal\Core\Render\Element\Tableselect::preRenderTableselect()

Prepares a 'tableselect' #type element for rendering.

Adds a column of radio buttons or checkboxes for each row of a table.

Parameters

array $element: An associative array containing the properties and children of the tableselect element. Properties used: #header, #options, #empty, and #js_select. The #options property is an array of selection options; each array element of #options is an array of properties. These properties can include #attributes, which is added to the table row's HTML attributes; see table.html.twig. An example of per-row options:

$options = array(
  array(
    'title' => $this
      ->t('How to Learn Drupal'),
    'content_type' => $this
      ->t('Article'),
    'status' => 'published',
    '#attributes' => array(
      'class' => array(
        'article-row',
      ),
    ),
  ),
  array(
    'title' => $this
      ->t('Privacy Policy'),
    'content_type' => $this
      ->t('Page'),
    'status' => 'published',
    '#attributes' => array(
      'class' => array(
        'page-row',
      ),
    ),
  ),
);
$header = array(
  'title' => $this
    ->t('Title'),
  'content_type' => $this
    ->t('Content type'),
  'status' => $this
    ->t('Status'),
);
$form['table'] = array(
  '#type' => 'tableselect',
  '#header' => $header,
  '#options' => $options,
  '#empty' => $this
    ->t('No content available.'),
);

Return value

array The processed element.

File

core/lib/Drupal/Core/Render/Element/Tableselect.php, line 149

Class

Tableselect

Provides a form element for a table with radios or checkboxes in left column.

Namespace

Drupal\Core\Render\Element

Code

public static function preRenderTableselect($element) {
  $rows = [];
  $header = $element['#header'];
  if (!empty($element['#options'])) {

    // Generate a table row for each selectable item in #options.
    foreach (Element::children($element) as $key) {
      $row = [];
      $row['data'] = [];
      if (isset($element['#options'][$key]['#attributes'])) {
        $row += $element['#options'][$key]['#attributes'];
      }

      // Render the checkbox / radio element.
      $row['data'][] = \Drupal::service('renderer')
        ->render($element[$key]);

      // As table.html.twig only maps header and row columns by order, create
      // the correct order by iterating over the header fields.
      foreach ($element['#header'] as $fieldname => $title) {

        // A row cell can span over multiple headers, which means less row
        // cells than headers could be present.
        if (isset($element['#options'][$key][$fieldname])) {

          // A header can span over multiple cells and in this case the cells
          // are passed in an array. The order of this array determines the
          // order in which they are added.
          if (is_array($element['#options'][$key][$fieldname]) && !isset($element['#options'][$key][$fieldname]['data'])) {
            foreach ($element['#options'][$key][$fieldname] as $cell) {
              $row['data'][] = $cell;
            }
          }
          else {
            $row['data'][] = $element['#options'][$key][$fieldname];
          }
        }
      }
      $rows[] = $row;
    }

    // Add an empty header or a "Select all" checkbox to provide room for the
    // checkboxes/radios in the first table column.
    if ($element['#js_select']) {

      // Add a "Select all" checkbox.
      $element['#attached']['library'][] = 'core/drupal.tableselect';
      array_unshift($header, [
        'class' => [
          'select-all',
        ],
      ]);
    }
    else {

      // Add an empty header when radio buttons are displayed or a "Select all"
      // checkbox is not desired.
      array_unshift($header, '');
    }
  }
  $element['#header'] = $header;
  $element['#rows'] = $rows;
  return $element;
}