Issue #3270540 by RenatoG: Move the default case from admin area to JS using Drupal.settings

js/block-class.js

@@ -9,6 +9,15 @@
   Drupal.behaviors.blockClass = {
     attach: function (context, settings) {
 
+      // Get the default case of Block Class.
+      var default_case = 'standard';
+
+      if (typeof settings.block_class != 'undefined' && settings.block_class.default_case != 'undefined') {
+
+        default_case = settings.block_class.default_case;
+
+      }
+
     }
   };
 })(jQuery, Drupal, drupalSettings);

src/Service/BlockClassHelperService.php

@@ -361,6 +361,13 @@ class BlockClassHelperService {
     $form['#validate'][] = 'block_class_form_block_form_validate';
 
     $form['#attached']['library'][] = 'block_class/block-class';
+
+    // Get the default case on settings.
+    $default_case = $config->get('default_case', 'standard');
+
+    // Put the "default case" in the Drupal settings to be used in the JS.
+    $form['#attached']['drupalSettings']['block_class']['default_case'] = $default_case;
+
   }
 
   /**