How to correctly pass changes on click to another class?

Question

JavaScript

There are 2 different classes, how to connect them correctly, in one, onclick should occur, and in the other, the reaction to these changes.
Without using jQ

Answer 1

Through events. For example in jQuery:

// класс1
$some.on('click', function () {
    $(document).trigger('custom_event', data);
});

// в классе 2 подписываемся на это событие
$(document).on('custom_event', function (data) {
    // выполняем наш код, после события в классе 1
});

UDP: You can repeat it on pure JS: habrahabr.ru/post/229189
In react, too, through events, only if you use Flux, events should fly through the dispatcher. Google flux.