Add js validation to event registration form

mjwshared.php

@@ -137,20 +137,14 @@ function mjwshared_civicrm_entityTypes(&$entityTypes) {
   _mjwshared_civix_civicrm_entityTypes($entityTypes);
 }
 
-
 /**
- * Implements hook_civicrm_navigationMenu().
- *\/
-function mjwshared_civicrm_navigationMenu(&$menu) {
-  $item = [
-    'label' => E::ts('Haystack theme settings'),
-    'name'  => 'Haystack theme settings',
-    'url'   => 'civicrm/admin/haystack/settings',
-    'permission' => 'administer CiviCRM',
-    'operator'   => NULL,
-    'separator'  => NULL,
-  ];
-  _mjwshared_civix_insert_navigation_menu($menu, 'Administer/Customize Data and Screens', $item);
-  _mjwshared_civix_navigationMenu($menu);
-}
+ * This hook is invoked when the 'confirm register' and 'thank you' form is rendered
  */
+function mjwshared_civicrm_buildForm($formName, &$form) {
+  switch ($formName) {
+    case 'CRM_Event_Form_Registration_Register':
+      CRM_Core_Region::instance('page-body')->add([
+        'template' => 'CRM/Form/validate.tpl'
+      ]);
+  }
+}