Server Emit to Specific Socket
Video Lecture
Description
Emit a message to a specific socket id
src/server/luckyNumbersGame.ts
``` typescript hl_lines=""
export default class LuckyNumbersGame {
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13 | public LuckyNumbers: { [id: string]: number } = {}
constructor() { }
public GetWinners(number: number): string[] {
let ret: string[] = []
for (let key in this.LuckyNumbers) {
if (number === this.LuckyNumbers[key]) {
ret.push(key)
}
}
return ret
}
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}
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64 | ### src/server/server.ts
``` typescript hl_lines="5 15 26 31 33 42 43 44 45 46 47 48 49 50 51"
import express from "express"
import path from "path"
import http from "http"
import socketIO from "socket.io"
import LuckyNumbersGame from "./luckyNumbersGame"
const port: number = 3000
class App {
private server: http.Server
private port: number
private io: socketIO.Server
private game: LuckyNumbersGame
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.game = new LuckyNumbersGame()
this.io.on('connection', (socket: socketIO.Socket) => {
console.log('a user connected : ' + socket.id)
this.game.LuckyNumbers[socket.id] = Math.floor(Math.random() * 10)
socket.emit("message", "Hello " + socket.id + ", your lucky number is " + this.game.LuckyNumbers[socket.id]);
socket.broadcast.emit("message", "Everybody, say hello to " + socket.id)
socket.on('disconnect', function () {
console.log('socket disconnected : ' + socket.id);
})
})
setInterval(() => {
let randomNumber: number = Math.floor(Math.random() * 10)
let winners: string[] = this.game.GetWinners(randomNumber);
if (winners.length) {
winners.forEach(w => {
this.io.to(w).emit("message", "*** You are the winner ***")
})
}
this.io.emit("random", randomNumber)
}, 1000)
}
public Start() {
this.server.listen(this.port)
console.log( `Server listening on port ${this.port}.` )
}
}
new App(port). Start()
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src/client/client.ts
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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()
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