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<?php $form = ActiveForm::begin([
	    'id' => 'registration-form',
	    'enableAjaxValidation' => true,
	    'validationUrl' => \yii\helpers\Url::to(['validate-form']), // Добавить URL валидации
    ]); ?>public function actionValidateForm() 
    {
        if (Yii::$app->request->isAjax) {
            Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
            $model = new \app\models\Predreg();
            if($model->load(Yii::$app->request->post()))
                return \yii\widgets\ActiveForm::validate($model);
        }
        throw new \yii\web\BadRequestHttpException('Bad request!');
    }