How to attach an event listener to the client?

Question

JavaScript

Greetings. I organize a chat (correspondence) on django. I would like to know how messengers, etc. receive messages without ajax (Their pages do not send or receive requests every 2 seconds). How do messages arrive instantly? How to organize a client listener on the user's side and on the sender's server, so as not to fill up with endless ajax requests? Help me please.

Answer 1

You need to use either AJAX or sockets. If you don't want to mess with sockets, use long polling. Scheme:
The schema works fine via AJAX. See here for more details.