Server IO Emit
Video Lecture
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.
src/server/server.ts
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46 | 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()
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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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