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POsimple Express 3.x socket.io chat
 

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    <p>Here is some code from a very popular <a href="http://psitsmike.com/2011/09/node-js-and-socket-io-chat-tutorial/" rel="nofollow noreferrer">webtutorial</a>. Some changes were made in order to use Express 3.x.</p> <p>here is the code of app.js:</p> <pre><code> var express = require('express') , http = require('http'); var app = express(); var server = http.createServer(app); var io = require('socket.io').listen(server); server.listen(8000); // routing app.get('/', function (req, res) { res.sendfile(__dirname + '/index.html'); }); // usernames which are currently connected to the chat var usernames = {}; io.sockets.on('connection', function (socket) { // when the client emits 'sendchat', this listens and executes socket.on('sendchat', function (data) { // we tell the client to execute 'updatechat' with 2 parameters io.sockets.emit('updatechat', socket.username, data); }); // when the client emits 'adduser', this listens and executes socket.on('adduser', function(username){ // we store the username in the socket session for this client socket.username = username; // add the client's username to the global list usernames[username] = username; // echo to client they've connected socket.emit('updatechat', 'SERVER', 'you have connected'); // echo globally (all clients) that a person has connected socket.broadcast.emit('updatechat', 'SERVER', username + ' has connected'); // update the list of users in chat, client-side io.sockets.emit('updateusers', usernames); }); // when the user disconnects.. perform this socket.on('disconnect', function(){ // remove the username from global usernames list delete usernames[socket.username]; // update list of users in chat, client-side io.sockets.emit('updateusers', usernames); // echo globally that this client has left socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected'); }); }); </code></pre> <p>The obove code is the same code as in the webtutorial only some changes for Express 3.x were made using the <a href="https://stackoverflow.com/questions/14279778/tutorial-for-express-3-x-and-socket-io#_=_">answer of Riwels</a> .</p> <p>here is the code of index.html:</p> <pre><code> &lt;script src="/socket.io/socket.io.js"&gt;&lt;/script&gt; &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"&gt;&lt;/script&gt; &lt;script&gt; var socket = io.connect('http://localhost:8080'); // on connection to server, ask for user's name with an anonymous callback socket.on('connect', function(){ // call the server-side function 'adduser' and send one parameter (value of prompt) socket.emit('adduser', prompt("What's your name?")); }); // listener, whenever the server emits 'updatechat', this updates the chat body socket.on('updatechat', function (username, data) { $('#conversation').append('&lt;b&gt;'+username + ':&lt;/b&gt; ' + data + '&lt;br&gt;'); }); // listener, whenever the server emits 'updateusers', this updates the username list socket.on('updateusers', function(data) { $('#users').empty(); $.each(data, function(key, value) { $('#users').append('&lt;div&gt;' + key + '&lt;/div&gt;'); }); }); // on load of page $(function(){ // when the client clicks SEND $('#datasend').click( function() { var message = $('#data').val(); $('#data').val(''); // tell server to execute 'sendchat' and send along one parameter socket.emit('sendchat', message); }); // when the client hits ENTER on their keyboard $('#data').keypress(function(e) { if(e.which == 13) { $(this).blur(); $('#datasend').focus().click(); } }); }); &lt;/script&gt; &lt;div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;"&gt; &lt;b&gt;USERS&lt;/b&gt; &lt;div id="users"&gt;&lt;/div&gt; &lt;/div&gt; &lt;div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;"&gt; &lt;div id="conversation"&gt;&lt;/div&gt; &lt;input id="data" style="width:200px;" /&gt; &lt;input type="button" id="datasend" value="send" /&gt; &lt;/div&gt; </code></pre> <p>Socket.io starts well but the app doesn't show any messages yet. Can you get this to work? </p>
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