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function render_example_preprocess_block in Examples for Developers 8

Same name and namespace in other branches
  1. 3.x modules/render_example/render_example.module \render_example_preprocess_block()

Implements hook_preprocess_block().

Related topics

Example: Render API
The Render API consists of two parts: one, structured arrays that provide data, and hints about how that data should be rendered, and two, a rendering pipeline that can be used to render these arrays into various output formats. This example module…

File

render_example/render_example.module, line 164
Demonstrates using Drupal's Render API.

Code

function render_example_preprocess_block(&$variables) {

  // Only modify the 'altering' page.
  if (\Drupal::routeMatch()
    ->getRouteName() !== 'render_example.altering') {
    return;
  }
  $config = \Drupal::config('render_example.settings');

  // This example shows how you can manipulate an existing renderable array. In
  // this case by adding #prefix and #suffix properties to the block in order to
  // wrap a <div> around it.
  if ($config
    ->get('wrap_blocks')) {
    $variables['content']['#prefix'] = '<div class="block-prefix"><p>' . t('Prefixed') . '</p>';
    $variables['content']['#suffix'] = '<span class="block-suffix">' . t('Block suffix') . '</span></div>';
  }

  // Show the render array used to build each block if the Devel module is
  // installed and the feature is enabled.
  if (Drupal::moduleHandler()
    ->moduleExists('devel') && $config
    ->get('show_block')) {
    $variables['content']['block_render_array'] = [
      '#type' => 'markup',
      '#prefix' => '<h2>' . t('The block render array for @block_id.', [
        '@block_id' => $variables['plugin_id'],
      ]) . '</h2>',
      'dump' => \Drupal::service('devel.dumper')
        ->exportAsRenderable($variables, $variables['plugin_id']),
    ];
  }
}