Soket.io Use Of Ping Pong Events | node-js-tutorial.blogspot.in

When we Create Client Server Application,
Some time we Need To Check out Live Connectivity between Client & Server.

Let's we Understand by Example,

Server Code.

 const fs       = require('fs');  
 const http      = require('http');  
 const path      = require('path');  
 const SocketIOServer = require('socket.io');  
 const app = new http.Server();  
 app.on('request', (req, res) => {  
  const index = path.join(__dirname, 'public', 'index.html')  
  fs.readFile(index, function (err, data) {  
   if (err) {  
    res.writeHead(500);  
    return res.end('Error loading index.html');  
   }  
   res.writeHead(200);  
   res.end(data);  
  });  
 });  
 app.listen(3000, 'localhost');  
 const io = new SocketIOServer(app);  
 // could also use "connection"  
 io.on('connect', function (socket) {  
  console.log(`${socket.id} "connect"`);  
  socket.on('ping', (data) => {  
   console.log('Receive "Ping Form Client"');  
   io.emit('pong', {});   
   console.log('Send "Pong To Client"');   
  });  
  socket.on('disconnect', () => {  
   console.log(`${socket.id} "disconnect"`);    
  });  
 });  

When Server Recive Ping event , then he send Cilent Pong Event.

Client Side Code.

 <!DOCTYPE html>  
 <html lang="en">  
  <head>  
   <meta charset="utf-8">  
   <meta http-equiv="X-UA-Compatible" content="IE=edge">  
   <meta name="viewport" content="width=device-width, initial-scale=1">  
   <title>Socket.IO Events</title>  
  </head>  
  <body>  
   <h1>Socket.IO Events</h1>  
   <script src="/socket.io/socket.io.js"></script>  
   <script>  
    const socket = io();  
    socket.on('pong', (data) => {  
     console.log('Receive "pong Form Server"');  
    });  
    socket.emit('ping', {});  
    console.log('Send "ping To Client"');  
   </script>  
  </body>  
 </html>  

Here, Client Send Ping Event To Server. and server Replay With Pong Methods.

Just Copy & Past Above code for Test Ping Pong.

Thanks.
NodeJs Tutorial