Node.js socket.io module

Introduction

This example makes use of the Node.js modules: ExpressJS and SocketIO

Please install express and sockets using the Node Package Manager

Command: npm install express

Command: npm install socket.io

The socket.io library (http://socket.io/) is a third-party module for Node which allows for real-time querying of the Node.js web server from the browser. 


var fs = require("fs"),
  config = JSON.parse(fs.readFileSync("files/config.json")),
  express = require("express"),
  app = express(),//from  w w  w. j  a  v  a  2 s  .  c  om
  server = app.listen(config.port, config.host),
  io = require("socket.io").listen(server);

//Set 'public' directory for easy routing of requests to pages
app.use(express.static(__dirname + "/views"));

console.log("Defining a socket triggered by a 'connection' event.");
io.sockets.on("connection", function(socket) {
  //Send data to the browser with an event type of 'connected'
  socket.emit("connected", {
    "source": "backend",
    "greeting": "Hello browser!"
  });
  //Listen for 'frontendEvent's triggered by the browser
  socket.on("frontendEvent", function(data) {
    console.log(data);
  });
});



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