server.js

//////////////////////////////// HTTP Portion
var http = require('http');
var fs = require('fs'); // Using the filesystem module
var path = require('path');
var httpServer = http.createServer(requestHandler);
httpServer.listen(8088);

/*
function requestHandler(req, res) {
	// Read index.html
	fs.readFile(__dirname + '/index.html', 
		// Callback function for reading
		function (err, data) {
			// if there is an error
			if (err) {
				res.writeHead(500);
				return res.end('Error loading canvas_socket.html');
			}
			// Otherwise, send the data, the contents of the file
			res.writeHead(200);
			res.end(data);
  		}
  	);
  	
  	
}
*/

function requestHandler(req, res) {
	///PATHNAME STUFF
	var pathname = req.url;

	if (pathname == '/') { // if blank let's ask for index.html
		pathname = '/mobile.html';
	}

	var ext = path.extname(pathname);	// what's our file extension
	
	var typeExt = {	// map extension to file type
		'.html': 'text/html',
		'.js':   'text/javascript',
		'.css':  'text/css'
	};

	var contentType = typeExt[ext] || 'text/plain';

	// Now read and write back the file with the appropriate content type
	fs.readFile(__dirname + pathname,
	  	function (err, data) {
	  		if (err) {
	        	res.writeHead(500);
	        	return res.end('Error loading ' + pathname);
	     	}
	     	res.writeHead(200,{ 'Content-Type': contentType });	// dynamically setting content type
	     	res.end(data);
	    }
	);
}


// WebSocket Portion
// WebSockets work with the HTTP server
var io = require('socket.io').listen(httpServer);

// Register a callback function to run when we have an individual connection
// This is run for each individual user that connects
io.on('connection', 
	// We are given a websocket object in our function
	function (socket) {
	
		console.log("We have a new client: " + socket.id);
		
		// When this user emits, client side: socket.emit('otherevent',some data);
		socket.on('chatmessage', function(data) {
			// Data comes in as whatever was sent, including objects
			console.log("Received: 'chatmessage' " + data);
			
			// Send it to all of the clients
			
			io.emit('chatmessage', data);
		});
		
		socket.on('backcolor', function(data) {
			// Data comes in as whatever was sent, including objects
			console.log("Received: 'backcolor' " + data);
			
			// Send it to all of the clients
			/* io.emit('backcolor', data); */
			socket.broadcast.emit('backcolor', data);
		});
		
		
		socket.on('disconnect', function() {
			console.log("Client has disconnected " + socket.id);
		});
	}
);