Fixes #4241: `yii\widgets\Pjax` was incorrectly setting container id

framework/CHANGELOG.md

@@ -65,6 +65,7 @@ Yii Framework 2 Change Log
 - Bug #4123: Trace level in logger had no effect in Targets, traces where not logged (cebe)
 - Bug #4127: `CaptchaValidator` clientside error message wasn't formed properly (samdark)
 - Bug #4162: Fixed bug where schema name was not used in ’SHOW CREATE TABLE’ query in `yii\db\mysql\Schema` (stevekr)
+- Bug #4241: `yii\widgets\Pjax` was incorrectly setting container id (mitalcoi)
 - Bug: Fixed inconsistent return of `\yii\console\Application::runAction()` (samdark)
 - Bug: URL encoding for the route parameter added to `\yii\web\UrlManager` (klimov-paul)
 - Bug: Fixed the bug that requesting protected or private action methods would cause 500 error instead of 404 (qiangxue)

framework/widgets/Pjax.php

@@ -152,7 +152,7 @@ class Pjax extends Widget
     {
         $headers = Yii::$app->getRequest()->getHeaders();
 
-        return $headers->get('X-Pjax') && $headers->get('X-Pjax-Container') === '#' . $this->getId();
+        return $headers->get('X-Pjax') && $headers->get('X-Pjax-Container') === '#' . $this->options['id'];
     }
 
     /**