owl/doc/reference/event_bus.md

🦉 Event Bus 🦉

It is sometimes useful to use a Bus to communicate informations between various parts of the code. Owl has a very simple bus class, which manages subscriptions, triggering events, and callbacks.

const bus = new owl.core.EventBus();

bus.on("some-event", null, function(...args) {
  console.log(...args);
});

bus.trigger("some-event", 1, 2, 3);
// [1,2,3] will be logged to the console

Its API is:

Method	Description
on(eventType, owner, callback)	add a listener
off(eventType, owner)	remove all listeners for an owner
trigger(eventType, ...args)	trigger an event
clear	remove all subscriptions

Note that the Store is an example of an EventBus.