Yii2 how to dynamically add validated fields?

Question

Yii

Good afternoon,
I want to make a Button + and - when you click on it, the field is added and the page is not reloaded.
Can you suggest how to do it? Maybe someone did and there is a solution :-)

Answer 1

Ajax, so as not to be smart with layout in js and overriding validation methods on the client.
In Yii1, I did just that.

Answer 2

You can create an array of values ​​and write your own validator.
to the model

public function rules() {
  return [
    ...
    ['fields', 'validateFields'],
    ...
  ];
}

public function validateFields() {
  for ($i = 0; $i < count($this->fields); ++$i) {
    ...
  }
}

In the shape of
<?php $form->field($model, 'fields[]') ?>