nodejs socket.io cannot connect to server?

Question

I\'ve been staring at node.js and socket.io examples all afternoon and i\'m trying to piece together a simple page that will tell me how many users I have connected to the s

Answer 1

I set up a test environment, installed express 3.0 and socket.io 0.9.5, and reproduced your error.

Then I ran npm install express@2.5.1 made a couple backwards tweaks based on the migration guide, and it ran great.

So I'm going to go ahead and suggest that socket.io is probably not compatible with express 3 yet, which still looks pretty unstable.

My app.js tweaked for express 2:

var express = require('express'),
    config = {
    port: 8080,
    hostname: 'localhost'
};

var server = module.exports = express.createServer();
/* server configuration */
server.set('views', __dirname + '/lib/views');
server.set('view options', { layout: false });
server.set('view engine', 'ejs');
//server.register('.html', 'ejs');require('ejs').__express);
server.use(express.cookieParser('keyboard unicorn'));
server.use(express.bodyParser());
server.use(express.methodOverride());
server.use(express.session({ secret: 'keyboard unicorn' }));
server.use('/', express.static(__dirname + '/lib/assets'));
server.use(server.router);

var io = require('socket.io').listen(server);

io.set('log level', 2);

var connections = { 'length': 0 };

server.get('/', function( req, res ) {
        res.render('index', {
                'page_title': 'sample application',
                    'number_of_connections': connections.length
                    });
    });

io.sockets.on('connection', function(socket) {
        socket.__fd = socket.fd;
        connections[socket.__fd]=socket.remoteAddress;
        ++connections.length;
        console.log('user connected! There are a total of ' + connections.length + ' users online.');
        return socket.on('disconnect',function(){
                delete conns[socket.__fd];
                --connections.length;
                console.log('user disconnected! There are a total of ' + connections.length + ' users remaining online.');
            });
    });

server.listen(config.port);

My index.ejs file:

   
   


There is a total of <%= number_of_connections %> user(s) connected.

I hope something here helps.