Display validation errors without page refresh - mysql

Question

Is there any way I can just display validation errors in Yii2 without a redirect or refresh?
This is my default controller code performing the login action, I would like to highlight the text fields when the data entered does not match the data in the database, a simple validation against the database.
public function actionLogin()
{
/** #var \amnah\yii2\user\models\forms\LoginForm $model */
$model = $this->module->model("LoginForm");
// load post data and login
$post = Yii::$app->request->post();
if ($model->load($post) && $model->validate()) {
$returnUrl = $this->performLogin(
$model->getUser(), $model->rememberMe
);
return $this->redirect($returnUrl);
}
return $this->render('login', compact("model"));
}

Answer 1

You can do it this way:
form login
<?php $form = ActiveForm::begin([
'validationUrl' => Url::toRoute(['site/login-validate']),
'action' => Url::toRoute(['site/login']),
'options' => [
'class' => 'form login'
],
]); ?>
Site Controller
public function actionLoginValidate(){
if(Yii::$app->request->isAjax){
$model = new Login();
if($model->load(Yii::$app->request->post())){
Yii::$app->response->format = Response::FORMAT_JSON;
return ActiveForm::validate($model);
}
}
throw new BadRequestHttpException("This action is not allowed.");
}