Communicating Between Server and Clients

Common Use Cases and there Relevant Events and Methods

img/client-server-comms.jpg

Server Side Event and Method Examples

Client Side Event and Method Examples

Note

To start, ensure your server.ts and client.ts are identical to below

src/server/server.ts

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import express from "express"
import path from "path"
import http from "http"
import socketIO from "socket.io"

const port: number = 3000

class App {
    private server: http.Server
    private port: number

    private io: socketIO.Server

    constructor(port: number) {
        this.port = port

        const app = express()
        app.use(express.static(path.join(__dirname, '../client')))

        this.server = new http.Server(app)
        this.io = new socketIO.Server(this.server);

        this.io.on('connection', (socket: socketIO.Socket) => {
            console.log('a user connected : ' + socket.id)
        })
    }

    public Start() {
        this.server.listen(this.port)
        console.log(`Server listening on port ${this.port}.`)
    }
}

new App(port).Start()

src/client/client.ts

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class Client {
    private socket: SocketIOClient.Socket

    constructor() {
        this.socket = io();
    }
}

const client = new Client();

Emit Cheatsheet

https://socket.io/docs/emit-cheatsheet/