Socket.io event not firing

Question

Here is the full code :- index.html

<!doctype html> <html> <head> <title>Socket.IO chat</title> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { font: 13px Helvetica, Arial; } form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; } form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; } form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; } #messages { list-style-type: none; margin: 0; padding: 0; } #messages li { padding: 5px 10px; } #messages li:nth-child(odd) { background: #eee; } </style> </head> <body> <ul id="messages"></ul> <form action=""> <input id="m" autocomplete="off" /><button>Send</button> </form> <script src="/socket.io/socket.io.js"></script> <script src="https://code.jquery.com/jquery-1.11.1.js"></script> <script> $(function () { var socket = io(); $('form').submit(function(){ socket.emit('chatIN', $('#m').val()); $('#m').val(''); return false; }); socket.on('chatOUT', function(msg){ $('#messages').append('<li><span>'+msg+'</span></li>'); }); }); </script> </body> </html>

And here is my index.js

var app = require('express')(); var http = require('http').Server(app); var io = require('socket.io')(http); app.get('/', function(req, res){ res.sendFile(__dirname + '/index.html'); }); io.sockets.on('connection', function(socket){ socket.on('chatIN', function(msg){ console.log('message:'+ msg); socket.emit('chatOUT:'+ msg); }); socket.on('disconnect', function(){ console.log('user disconnected'); }); }); http.listen(3000, function(){ console.log('listening on *:3000'); });

I am facing a problem while trying out a socket.io beginner's tutorial, I followed this tutorial https://socket.io/get-started/chat/

Everything seems to be okay till the very last thing, when they build a chat app, and when you hit submit in textbox, it updates the contents of the element.

I can see the messages getting printed in the node js console, but nothing in chrome's console. I also tried debugging it using developer options, but the control just never goes in this method in the index.html.

socket.on('chat message', function(msg){

Can someone please help ? I am really new to socket.io and nodejs. Thanks

Please provide more of your code. There isn't much information to help you with here... — Max Weinzierl
– Max Weinzierl, Commented Mar 12, 2017 at 2:28
Here is my code github.com/mithuns/my_node_app/tree/TestBranch — MithunS
– MithunS, Commented Mar 12, 2017 at 3:28
@MithunS - On this site, your code MUST be pasted into your question, not only referenced via an external link. This is because external links have a nasty habit of changing over time or disappearing, thus ruining the value of the question as a reference for those who come in the future. So, please paste the relevant portions of your code directly into your question and format it appropriately. — jfriend00
– jfriend00, Commented Mar 12, 2017 at 4:07

jfriend00 · Accepted Answer · 2017-03-12 04:11:11Z

You are sending the wrong message from the server.

On the server, change this:

socket.emit('chatOUT:'+ msg);

to this:

socket.emit('chatOUT', msg);

Your client code is listening for the chatOUT message so that's the exact message name need to send. Here's the matching client code:

socket.on('chatOUT', function(msg){...}

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