An example of socket.io

socketio.js

/***
/* Example by Viktor Hundahl Strate
*/

// The server stored in the variable 'app', with the function on line 12 called 'handler'
var app = require("http").createServer(handler),
// Imports the socket.io in the folder 'node_modules'
io = require("socket.io").listen(app),
// Imports the file server
fs = require("fs");

// Starts the server on port '8000'
app.listen(8000);

// Handler is called when somone joins the server, and it shows the 'index.html' file, to the user.
function handler(req, res){
	// Reads the file 'index.html'
	fs.readFile("index.html", function (err, data){
		// Sets the response code to 200 aka OK
		res.writeHead(200);
		// Sends the data from the 'index.html' file to the user.
		res.end(data);
	})
}

// When somone connects to the server it gets called
io.sockets.on('connection', function(socket){
	// Sends out some data with the name 'news'
	socket.emit('news', {hello: "world"});
	// Waits to somone sends out some data with the name 'back',
	// and when it happends get the data
	socket.on('back', function(data){
		// logs out the data in the console
		console.log(data);
	});
});