socket..io
<script src="https://cdn.socket.io/socket.io-3.0.1.min.js"></script>socket..io
<script src="https://cdn.socket.io/socket.io-3.0.1.min.js"></script>socket io nodejs
const express = require('express');const app = express();const http = require('http');const server = http.createServer(app);const { Server } = require("socket.io");const io = new Server(server);app.get('/', (req, res) => { res.sendFile(__dirname + '/index.html');});io.on('connection', (socket) => { console.log('a user connected');});server.listen(3000, () => { console.log('listening on *:3000');});how to check whether the user is online or not using socket.io
const users = {};
io.on('connection', function(socket){
console.log('a user connected');
socket.on('login', function(data){
console.log('a user ' + data.userId + ' connected');
// saving userId to array with socket ID
users[socket.id] = data.userId;
});
socket.on('disconnect', function(){
console.log('user ' + users[socket.id] + ' disconnected');
// remove saved socket from users object
delete users[socket.id];
});
});socket io node js
npm install socket.iosocket.io
var app = require('express')();
var http = require('http').Server(app);
app.get('/', function(req, res) {
res.sendFile('index.html');
});
http.listen(3000, function() {
console.log('listening on *:3000');
});Copyright © 2021 Codeinu
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