Hadi.M Hadi.M - 2 years ago 311
Javascript Question

Real time notification from web server to client bowers

I am developing an appointments center web application using php+mysql. what I currently trying to do is to send notification when an appointment has been made from web server to client/user bowers without third party pushers and without using jQuery SetInterval AJAX request. I think SetInterval & AJAX is a bad approach because there would be too much traffic between the client and the server.

How can I implement notifications without polling the server with SetInterval?

Answer Source

You can do this using NodeJs. NodeJS is javascript on your server that pushes content to connected clients in real time.

Its really easy to use and setup. You need a server dedicated to the real time app, I use http://nodejitsu.com.

Server Side

var app = require('http').createServer(handler)
, io = require('socket.io').listen(app)
, url = require('url')


function handler (req, res) {
// parse URL
var requestURL = url.parse(req.url, true);

// if there is a message, send it

// end the response
res.writeHead(200, {'Content-Type': 'text/plain'});

function sendMessage(message) {
io.sockets.emit('notification', {'message': message});

Client Side

<script src="socket.io.min.js"></script>
var socket = io.connect('http://localhost:8080');
socket.on('notification', function (data) {

I added the easy to use example by @intivev below to complete the answer for future readers

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