Ребят, подскажите что не так делаю? https://ru.stackoverflow.com/questions/1104170/%D0%9A%D0%B0%D0%BA-%D0%BF%D0%B5%D1%80%D0%B5%D0%B4%D0%B0%D1%82%D1%8C-onchange-%D0%B2-%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D1%8C%D1%81%D0%BA%D0%B8%D0%B9-materialize-%D0%BA%D0%BE%D0%BC%D0%BF%D0%BE%D0%BD%D0%B5%D0%BD%D1%82-react