Fixes #3216: Fixed the bug that `yii.activeForm.destroy()` did not remove `submit` event handlers

framework/CHANGELOG.md

@@ -18,6 +18,7 @@ Yii Framework 2 Change Log
 - Bug #3184: Fixed the bug that client validation for string length comparison did not set error message correctly (Sergeygithub)
 - Bug #3194: Date formatter works only for timestamps in the year range 1970 to 2038 (kartik-v)
 - Bug #3204: `yii\di\Container` did not handle the `$config` parameter well in case when it does not have a default value (qiangxue)
+- Bug #3216: Fixed the bug that `yii.activeForm.destroy()` did not remove `submit` event handlers (qiangxue)
 - Enh #2837: Error page now shows arguments in stack trace method calls (samdark)
 - Enh #3088: The debug and gii modules will manage their own URL rules now (hiltonjanfield, qiangxue)
 - Enh #3103: debugger panel is now not displayed when printing a page (githubjeka)

framework/assets/yii.activeForm.js

@@ -111,7 +111,7 @@
                     $form.on('mouseup.yiiActiveForm keyup.yiiActiveForm', ':submit', function () {
                         $form.data('yiiActiveForm').submitObject = $(this);
                     });
-                    $form.on('submit', methods.submitForm);
+                    $form.on('submit.yiiActiveForm', methods.submitForm);
                 }
             });
         },