Yii2. How to check if one of the two required fields is filled?

Question

Yii

Validation rule:

...
[['field1', 'field2'], 'validateFields', 'skipOnEmpty' => false, 'skipOnError' => false],
...

Validation function:

public function validateFields($attribute, $params)
{
    // делаю очистку ошибок обоих полей (это не работает)
    $this->clearErrors('field1');
    $this->clearErrors('field2');
    // проверяю
    if (empty($this->field1) && empty($this->field2)) {
        // в первый input помещаю пустую ошибку (поля идут вертикальным списком)
        $this->addError('field1', '');
        // во второй инпут помещаю саму ошибку
        $this->addError('field2', 'At least one must not be blank.');
        return false;
    }
    return true;
}

For the ActiveForm itself:

...
'enableAjaxValidation' => true,
'enableClientValidation' => false,
...

The essence of the problem. The fields are empty. We pass the focus to the first field, then the second, remove the focus from the second - the ajax validation works, both fields (in turn) are marked as has-error and an error message appears. We transfer the focus to the first field, enter the data, remove the focus from the field, and the error continues to hang on the second field. How to force the form to "revalidate" one field when the value of another field changes?

Answer 1

Complete the client-side with a validator.