socket.io: disconnect event isn't fired

Question

I have made a simple realtime visitor counter.

You can download it from this repository.

What happens is that disconnect event (even after browser closing) on server is never fired.

server.js is:

(function () { var app, count, express, io;  express = require('express'); io = require('socket.io');  app = module.exports = express.createServer();  app.configure(function () {     app.set('views', __dirname + '/views');     app.set('view engine', 'jade');     app.use(express.bodyParser());     app.use(express.methodOverride());     app.use(require('stylus').middleware({         src: __dirname + '/public'     }));     app.use(app.router);     return app.use(express.static(__dirname + '/public')); });  app.configure('development', function () {     return app.use(express.errorHandler({         dumpExceptions: true,         showStack: true     })); }); app.configure('production', function () {     return app.use(express.errorHandler()); });  io = require('socket.io').listen(app);  count = 0;  io.sockets.on('connection', function (socket) {     count++;     io.sockets.emit('count', {         number: count     }); });  io.sockets.on('disconnect', function () {     console.log('DISCONNESSO!!! ');     count--;     io.sockets.emit('count', {         number: count     }); });   app.get('/', function (req, res) {     return res.render('index', {         title: 'node.js express socket.io counter'     }); }); if (!module.parent) {     app.listen(10927);     console.log("Express server listening on port %d", app.address().port); }  }).call(this); 

Script on the client is:

    script(type='text/javascript')          var socket = io.connect();          socket.on('count', function (data) {             $('#count').html( data.number );         }); 

Answer 1

Put your on disconnect code inside your on connect block and edit it a bit like so:

io.sockets.on('connection', function (socket) {     count++;     io.sockets.emit('count', {         number: count     });      socket.on('disconnect', function () {         console.log('DISCONNESSO!!! ');         count--;         io.sockets.emit('count', {             number: count         });     }); }); 

This way you're detecting when a specific socket (specifically the socket you pass to your anonymous function that is run on connection) is disconnected.