Sometimes, we want to send a message to a particular client with socket.io and JavaScript.
In this article, we’ll look at how to send a message to a particular client with socket.io and JavaScript.
How to send a message to a particular client with socket.io and JavaScript?
To send a message to a particular client with socket.io and JavaScript, we call the socket.emit and socket.on method.
For instance, on client side, we write
const socket = io.connect("http://localhost");
socket.emit("join", { email: "user1@example.com" });
to call socket.emit to emit the join event with some event data.
Then on server side, we write
const io = require("socket.io").listen(80);
io.sockets.on("connection", (socket) => {
socket.on("join", (data) => {
socket.join(data.email);
});
});
to call io.sockets.on with 'connection' to listen to the connection event.
In the callback, we call socket.on with 'join' to listen to the join event.
In the join callback, we get the email value we sent from data.email.
Conclusion
To send a message to a particular client with socket.io and JavaScript, we call the socket.emit and socket.on method.
