if I using the step module with io.on('connection', function(){
});
it will have some problem, if the socket is lately start than client, the client will not receive other event from the socket server, it on have the connection.
please explain the problem, and how to fix it ?

I tried copying and pasting the code and run the application. I checked the: " io.on('connection', function(socket){ " part and it works when a user connects. But the other part of " socket.on..... " doesn't seem to be working. When I enter texts in the form I get blank on the client page and the server is blank as well. I tried to test it by typing console.log to display something when "socket.on" gets fired, but nothing shows up. What's missing? Can anyone please help?

Thanks

Hello, if i want close the terminal or navigate in other repertory, this close the server. How do for keep the server start ?? Thank you.

In the expamle, index.html

and then we can use io, but i don't understand how can we get this file in my localserver without any setting, the real url is 'http://127.0.0.1:3000/socket.io/socket.io.js'.
this problem has plagued me for a long time, thank U

I have make a new variable call httpd and named it as var httpd = require('http'); and I use it to create and get the client request file, and now I want to emit a value when someone visit /greet path it will emit to chat room so I add this before io.on code
I add the following code
var httpd = require('http);
var path;
httpd.createServer(function (req, res) {
path = req.url;
};
if (path == "/greet") {
io.on ....

But the code doesn't emit a value to chatroom when someone visit /greet
What I'm missing?
Or we can't get req.url in socket.io code?

I'm using Firefox (108.0, MacOS 13.1).
When I run this project, the browser debugger shows there's some 500 responses from the server.

I added this code to the index.js, and the server console logs:

io.engine.on("connection_error", (err) => {
  // console.log(err.req);      // the request object
  console.log(err.code);     // the error code, for example 1
  console.log(err.message);  // the error message, for example "Session ID unknown"
  console.log(err.context);  // some additional error context
});

I guess the problem is: the websocket connection was established successfully, but the polling connection failed.
So I tried to add a parameter to allow only polling:

const io = require('socket.io')(http, {
  transports: ['polling']
});

Then, the connection never establishes successfully. The browser sends requests and gets 500 responses infinitely. The server also gets "Session ID unknown" infinitely.

Looks like a new connection starts to establish when the previous connection hasn't finished establishing.

I've tried the latest version (4.5.4) of "socket.io" and "socket.io-client", the behavior is the same.
And I found the polling connection can be successfully established in the latest version of Chrome, but failed in Edge as in Firefox.

How can I solve this?

Hi, I'm new to NodeJS .. I got to the last step and nothing happened. I looked over the code and noticed it was missing
var socket = io();
like the previous steps had

Messages are being sent repeatedly, and it's on the client side.

1. navigate to https://socketio-chat-example.now.sh/

i use pacaage
npm i socket.io
npm i express

I downloaded the package and received a lot of requests like an image.
What package should we apply?
The code is the same as the original code.

I'm getting this error about the form addEventListener and I can't understand why.
I already tried to copy the code and still get the same error.

Uncaught TypeError: form.addEventListener is not a function
at index.js:10:6

`var socket = io();

var input = document.getElementById('input');
var roomInput = document.getElementById('room-input');
var messages = document.getElementById('messages');
var form = document.getElementById('form');

form.addEventListener('submit', function(e) {
e.preventDefault();
if (input.value) {
socket.emit('chat message', input.value);
input.value = '';
}
});

socket.on('chat message', function(msg){
var item = document.createElement('li');
item.textContent = msg;
messages.appendChild(item);
window.scrollTo(0, document.body.scrollHeight);
});`

Can you help me, please?

Regards!
Pedro

Update socket.io to the latest version (4.1.2)

In this project some i get is
First one is Two user are connected then it's not get alert or any type of other suggestion
Second one is when user click on the send button then the message not send or not show in any place like a nothing to see just realise message was send but which place send it's not see

SO i need some help please

any one do this then tell me i'm still waiting for a good developer

I am able to run the sample app downloaded from the following website: https://github.com/socketio/chat-example

However when I try to copy the index.js and index.html file to my existing project folder, the app can't seem to run. have also installed the dependencies:

• npm install --save [email protected]
• npm install --save socket.io

May I missing other files/ dependencies?

added origins but got the same problem

var io = require('socket.io')(http, {origins: ':'});

If i replace

app.get('/', (req, res) => {
res.sendFile(new URL('./index.html', import.meta.url).pathname);
});

With

app.get("/", (req,res) => {
res.sendFile(__dirname + "/index.html");
});

And insert these codes

import { dirname } from "path";
import { fileURLToPath } from "url";
const __dirname = dirname(fileURLToPath(import.meta.url));

Everything work fine !

This code is not working alrite....multiple socket.ids generated from the same tab. So sometimes client connects to himself or others connect to non existing client.

You Must include <script src="/socket.io/socket.io.js"></script> before the other script otherwise it wont work.

"Chat" works fine on "localhost", using 3 different browsers but on intranet, page is not"sending" or receiving. tried suggestion on #21 but did not fix

What the title says. I have copied and slightly modified the code. It works as intended, but I can only connect from the machine it is running on (using localhost:3000 or 192.168.1.3:3000). I have attempted to use port forwarding but it did not help the issue. I'd like to know how I can make the app accessible from another machine, and if it is possible to host the app on GH Pages.

I got the socket js and jquery js file offline and ran my nodemon, but it doesn't work, but works if am using the socket js and jquery js file from cdn

index.html, line 26:
var socket = io();

=> 'io' not defined

Will this run on socket.io v2.0 and later?

Hi,
The example, if you install express and socket.io via

npm install express socket.io

,doesn't work anymore, because the client index.html file references to an old socket.io version.

For me, the browser opens a lot of connection every second instead of keeping one.

If i change the script on the index.html to https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.3.0/socket.io.js it works again flawlessly.

BR
kekerooo

when I download this demo; I can run it on chrome ;but not send message on ie or edge ; always say io is not defined

Hi, I'll maybe use this code or snippet from this.

I can't see any license, so for now it means it's closed by default.

Is is free software ?

Great example, however it seems my Microsoft Edge v 123.0.2420.1 is killing the script every time I start typing in Edge.

Edge is receiving other messages from Chrome and Firefox without problem.

C:\Users\ted\NODEDEV\WEBSOCKET3\index.js:46
callback();
^

TypeError: callback is not a function
at Socket. (C:\Users\ted\NODEDEV\WEBSOCKET3\index.js:46:7)

Node.js v18.18.2
[nodemon] app crashed - waiting for file changes before starting...
[nodemon] restarting due to changes...
[nodemon] starting node index.js
server running at http://localhost:3000

How can I resolve sending messages by Edge?

Messages written before a user opens the page do not appear

I wasted around 2 hours wondering why it's not working when I did everything like in this tutorial:
https://socket.io/get-started/chat/
I downloaded code from github. Copied everything from index.js - not working, everything from index.html - not working. Then I look to package.json - damn, that's some old one. Finally when I copied package.json and reinstalled it started working.

But I can't get it going with newest version because... tutorial is just shi**y, sorry

The example has Access-Control-Allow-Origin problem.

I just edit index.html

var socket = io('http://localhost:3000');

Then the Chrome Console print like this

Failed to load http://localhost:3000/socket.io/?EIO=3&transport=polling&t=1521768422803-4: The 'Access-Control-Allow-Origin' header has a value 'null' that is not equal to the supplied origin. Origin 'null' is therefore not allowed access.

I followed the tutorial and I test it by opening 2 tabs to connect and it shows both are connected but when I send the message on one tab the other tab is not updated.

I have few users who spam my chat. How can I determine their ip?

In this sample app, it hard codes a CDN reference to v1.2 of socket.io. When someone tries to implement this sample app and the current version of socket.io that they are using on their server is no longer 1.2, it does not work and it is difficult to figure out why. I would think the script tag should be <script src="/socket.io/socket.io.js"></script> so that it always loads the right version of the client. For an example of how confused a socket.io newbie gets when this happens see this question/answer on stackoverflow.