Yii2 run JS-script on error ajax-validation - php

Question

There is my form:
$form = ActiveForm::begin([
'id' => 'user-create-form',
'enableAjaxValidation' => true,
'enableClientValidation' => false,
'validationUrl' => Url::toRoute(Yii::$app->controller->id . '/validation'),
'validateOnType' => true,
]);
JS-script is registered on this form and performed Russian to English transliteration according to some rules on .keyup() event. Transliteration result is added to samname field.
There is validation rule in UserCreateForm model:
public function rules()
{
return [
[['samname'], 'validateUserExist'],
];
}
public function validateUserExist()
{
$check = Yii::$app->CustomComponents->checkUserExist($this->samname);
if ($check) {
$errorMessage = 'User exists: ' . $check;
$this->addError('samname', $errorMessage);
}
}
Function checkUserExist() checks existing of created name and returns an error in matching case.
There is action on controller:
public function actionValidation()
{
$model = new UserCreateForm();
if (\Yii::$app->request->isAjax && $model->load(\Yii::$app->request->post())) {
\Yii::$app->response->format = Response::FORMAT_JSON;
echo json_encode(ActiveForm::validate($model));
\Yii::$app->end();
}
}
It works great, validation is performed, matching case returns an error...
But!
It's required that JS-script is run again and added next letter to the name on error (JS-script provides this functionality). How to run JS-script again after validator was return an error?

Answer 1

#yafater Thanks for help! I find solution.
$('form').on('afterValidateAttribute', function (event, attribute, message) {
if (attribute.name === 'samname')
{
$.ajax({
url: "url-to-action",
type: "POST",
dataType: "json",
data: $(this).serialize(),
success: function(response) {
if ( typeof(response["form-samname"]) != "undefined" && response["form-samname"] !== null ) {
// code here
}
},
});
return false;
}
});