add JS magic

app/assets/javascripts/dispatcher.js

@@ -602,6 +602,21 @@ import initGroupAnalytics from './init_group_analytics';
         case 'groups:analytics:show':
           initGroupAnalytics();
           break;
+        case 'admin:groups:edit':
+        case 'groups:ldap_group_links:index':
+          const $cnLink = $('.cn-link');
+          const $filterLink = $('.filter-link');
+
+          const showGroupLink = () => {
+            const $checkedSync = $('input[name="sync_method"]:checked').val() === 'group';
+
+            $cnLink.toggle($checkedSync);
+            $filterLink.toggle(!$checkedSync);
+          };
+
+          $('input[name="sync_method"]').on('change', showGroupLink);
+          showGroupLink();
+          break;
       }
       switch (path[0]) {
         case 'sessions':