Skip to content


 Zabbix
 Grafana
 Prometheus
 React Three Fiber
 Threejs and TypeScript
 SocketIO and TypeScript
 Blender Topological Earth
 Sweet Home 3D
 Design Patterns Python
 Design Patterns TypeScript
   
 Course Coupon Codes
Three.js and TypeScript
Kindle Edition
$6.99 $9.99 Paperback 
$22.99 $29.99




Design Patterns in TypeScript
Kindle Edition
$6.99 $9.99 Paperback
$11.99 $19.99




Design Patterns in Python
Kindle Edition
$6.99 $9.99 Paperback
$11.99 $19.99




Server IO Emit

Video Lecture

Server IO Emit Server IO Emit

Description

Emit a message to all connected sockets. Used most often when a server level event occurs, eg, a timer event occured and you want to send a message to all clients.

img/server-io-broadcast-emit.jpg

./src/server/server.ts

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
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)

            socket.emit('message', 'Hello ' + socket.id)

            socket.broadcast.emit(
                'message',
                'Everybody, say hello to ' + socket.id
            )

            socket.on('disconnect', function () {
                console.log('socket disconnected : ' + socket.id)
            })
        })

        setInterval(() => {
            this.io.emit('random', Math.floor(Math.random() * 10))
        }, 1000)
    }

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

new App(port).Start()

./src/client/client.ts

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
class Client {
    private socket: SocketIOClient.Socket

    constructor() {
        this.socket = io()

        this.socket.on('message', function (message: any) {
            console.log(message)
            document.body.innerHTML += message + '<br/>'
        })

        this.socket.on('random', function (message: any) {
            console.log(message)
            document.body.innerHTML += 'Winning number is ' + message + '<br/>'
        })
    }
}

const client = new Client()