Checking for empty View Results in Views Block Displays

/**
 * Implements hook_preprocess_views_view().
 * Adds a custom class to the main view wrapper, which includes .view-content.
 */
function yourtheme_preprocess_views_view(&$variables) {
  // The $variables array represents the top-level view wrapper.
  // Target only block displays for safety (optional).
  if (strpos($variables['view']->current_display, 'block') === 0) {

    // Target a specific view/display ID (highly recommended).
    // if ($variables['view']->id() == 'my_table_view_id') {

      // Ensure the attributes array exists.
      if (!isset($variables['attributes']['class'])) {
        $variables['attributes']['class'] = [];
      }

      // Add your custom class.
      $variables['attributes']['class'][] = 'my-custom-table-view-class';
    // }
  }
}

 
  _preprocess_views_view_unformatted(&$variables) {
  // Check if the current view is the one you want to target (optional but recommended).
  // Example: if ($variables['view']->id() == 'my_view_id' && $variables['view']->current_display == 'block_1') {

  // The .view-content class is typically part of the unformatted list wrapper.
  // This template's variables directly control that wrapper.

  if (!isset($variables['attributes']['class'])) {
    $variables['attributes']['class'] = [];
  }

  // Add your custom class to the existing classes.
  $variables['attributes']['class'][] = 'my-custom-view-class';

  // Example for adding a class based on the view's machine name and display
  $variables['attributes']['class'][] = 'view-id-' . $variables['view']->id() . '-' . $variables['view']->current_display;
}
   
    
      /**

 
   * Implements hook_views_view().
 *
 * Prevents rendering a view display if its results are empty.
 */
function your_module_views_view(\Drupal\views\ViewExecutable $view, $display_id) {
  // 1. Target specific View Displays (Optional but Recommended)
  // To avoid affecting all views, you can check for a specific view ID or display ID.
  // Example: if ($view->id() !== 'my_view_id' || $display_id !== 'block_1') { return; }

  // 2. Check if the current display is a Block display type.
  // We only want to apply this logic to blocks.
  if (strpos($display_id, 'block') === 0) {

    // 3. Ensure the view has been executed and check the result count.
    if ($view->executed) {
      $result_count = count($view->result);

      // 4. If the results are empty, set $view->build_renderable to FALSE.
      if ($result_count === 0) {
        // Setting build_renderable to FALSE stops the view from generating
        // any render array, effectively skipping all rendering, including
        // wrappers and contextual links associated with the view's output.
        $view->build_renderable = FALSE;
      }
    }
  }
}



/**
* Implements hook_preprocess_block().
*/
function your_module_or_theme_preprocess_block(&$variables) {
 // Check if the block content is a 'view'.
 if (isset($variables['content']['#block_content']) && $variables['content']['#block_content'] instanceof \Drupal\views\Plugin\Block\ViewsBlock) {
   /** @var \Drupal\views\Plugin\Block\ViewsBlock $block_content */
   $block_content = $variables['content']['#block_content'];
   // Get the view executable object from the block.
   // The view object is available after the block is built.
   // If the view hasn't been executed yet, you might need to
   // check for the 'view' property on the #view_id and #display_id.
   if (isset($block_content->get('view'))) {
     /** @var \Drupal\views\ViewExecutable $view */
     $view = $block_content->get('view');
     // Ensure the view has been executed and has results data.
     if (isset($view) && $view->executed) {
       $result_count = count($view->result);
       // Check if the view results are empty.
       if ($result_count === 0) {
         // Skip rendering the block entirely by setting #access to FALSE.
         // This is the standard Drupal way to prevent rendering.
         $variables['#access'] = FALSE;
       }
     }
   }
 }
}