Fixes #2380: `yii\widgets\ActiveForm` will register validation js even if there…

framework/CHANGELOG.md

@@ -216,6 +216,7 @@ Yii Framework 2 Change Log
 - Enh: ListView now uses the widget ID in the base tag, consistent to gridview (cebe)
 - Enh: Added `yii\web\Response::enableCsrfCookie` to support storing CSRF tokens in session (qiangxue)
 - Chg #2287: Split `yii\db\ColumnSchema::typecast()` into two methods `phpTypecast()` and `dbTypecast()` to allow specifying PDO type explicitly (cebe)
+- Chg #2380: `yii\widgets\ActiveForm` will register validation js even if there are not fields inside (qiangxue)
 - Chg #2898: `yii\console\controllers\AssetController` is now using hashes instead of timestamps (samdark)
 - Chg #2913: RBAC `DbManager` is now initialized via migration (samdark)
 - Chg #3036: Upgraded Twitter Bootstrap to 3.1.x (qiangxue)

framework/widgets/ActiveForm.php

@@ -250,14 +250,13 @@ class ActiveForm extends Widget
             throw new InvalidCallException('Each beginField() should have a matching endField() call.');
         }
 
-        if (!empty($this->attributes)) {
         $id = $this->options['id'];
         $options = Json::encode($this->getClientOptions());
         $attributes = Json::encode($this->attributes);
         $view = $this->getView();
         ActiveFormAsset::register($view);
         $view->registerJs("jQuery('#$id').yiiActiveForm($attributes, $options);");
-        }
+
         echo Html::endForm();
     }