javascript Socket.io Starter

Posted 2021-05-03

const express = require('express');
const app = express();
const http = require('http').Server(app);
const io = require('socket.io')(http);
 
app.use(express.static(__dirname + '/'));
app.get('/', function (req, res) {
    res.render('index');
});

// user connects
io.on('connection', function(socket){
    // function sendMessage is called by frontend
    socket.on('sendMessage', function(message){
    
            // message is pushed to all connected sockets
            io.emit('getMessage', message);
        }
    });
});
 
//_____Start server_____/
http.listen(8080, function () {
    console.log('listening on *:8080');
});

// <script src="/socket.io/socket.io.js"></script>
// needs to be included in .html
 
var socket = io();
 
document.body.addEventListener('click', function() {
  // Hallo Welt is pushed to backend on body click
  socket.emit('sendMessage', "Hallo Welt");
}, true);
 
// Message is received from backend
socket.on('getMessage', function(msg){
  console.log(msg);
});