How to highlight multiple fields in yii2 for one validation error?

Question

Yii

Is it possible to highlight several related fields at once while validating the active form, displaying only one error??

Answer 1

In Yii1, the logic was as follows: validation is assigned to one of the fields through a class method in which errors are set for several fields at once.

public function rules () {
    return [
        ['field1', 'customValidate'],
    ];
}

public function customValidate ($attribute, $params) {
    if (some_expression) {
        $this->addError('field1', 'Error description');
        $this->addError('field2', '');
        $this->addError('field3', '');
    }
}

In Yii2, I think you can do it a little easier:

public function rules () {
    return [
        [
            'field1',
            function($attribute, $params){
                if (some_expression) {
                    $this->addError('field1', 'Error1 description');
                    $this->addError('field2', '');
                    $this->addError('field3', '');
                }
            }
        ],
    ];
}