Develop Reference

Client not connecting wits server Socket.IO

Hi I am making a chat site with the url http://localhost/Seminarska%20naloga%20NRSA/index.php?stran=chat
Once the message is submitted the server doesn't recive it and the client doesn't even connect to the server. The server is running on http://localhost:3000 when the code is in index.html file the chat works fina and with no problems connects to the server but when i put it in the php file called chat.html.php the connection fails.
HTML code:
<ul id="messages"></ul>
<form id="form" action="">
<input id="input" autocomplete="off" /><button>Send</button>
</form>
<script src="/Seminarska naloga NRSA/template/node_modules/socket.io/client-dist/socket.io.js"></script>
<script>
const socket = io("http://192.168.88.152:3000");
var messages = document.getElementById('messages');
var form = document.getElementById('form');
var input = document.getElementById('input');
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);
});
</script>
Server code:
const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const { Server } = require("socket.io");
const io = new Server(server);
app.get('/', (req, res) => {
res.sendFile(__dirname+'/chat.html.php');
});
io.on('connection', (socket) => {
console.log('a user connected');
});
io.on('connection', (socket) => {
console.log('a user connected');
socket.on('disconnect', () => {
console.log('user disconnected');
});
});
io.on('connection', (socket) => {
socket.on('chat message', (msg) => {
console.log('message: ' + msg);
});
});
io.on('connection', (socket) => {
socket.on('chat message', (msg) => {
io.emit('chat message', msg);
});
});
server.listen(3000, () => {
console.log('listening on *:3000');
});
In the console there are no errors or warnings if the code is in index.html and i go to http://logalhost:3000 the ctah works perfectly.

This should be your client
<script src="/Seminarska naloga NRSA/template/node_modules/socket.io/client-dist/socket.io.js"></script>
<script>
const socket = io("http://192.168.88.152:3000");
var messages = document.getElementById('messages');
var form = document.getElementById('form');
var input = document.getElementById('input');
form.addEventListener('submit', function(e) {
e.preventDefault();
if (input.value) {
socket.emit('SendMsg', input.value);
input.value = '';
}
});
socket.on('RecieveMsg', msg => {
var item = document.createElement('li');
item.textContent = msg;
messages.appendChild(item);
window.scrollTo(0, document.body.scrollHeight);
});
</script>
This should be your server
const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const io = require("socket.io")(server,
cors: {
origin: 'http://localhost',
methods: ["GET", "POST"]
}
);
app.get('/', (req, res) => {
res.sendFile(__dirname+'/chat.html.php');
});
io.on('connection', (socket) => {
console.log('a user connected');
io.on('SendMsg', msg => {
console.log('Message: ' + msg);
io.emit('RecieveMsg', msg);
});
io.on('disconnect', () => {
console.log('A user disconnected');
})
});
server.listen(3000, () => {
console.log('listening on *:3000');
});
all of your io.on() functions should be inside of io.on('connection'), because you want your server to listen after the connection.
Hope this helps :D

Node spits out this random error, I cant see the problem in my code

I am working on a esp32 wifi speaker, I got the board going, and now I need to make a server from where you can stream what songs you'd like. I'm new to working on the backend and i'm having trouble with this error: node:internal/errors:465 ErrorCaptureStackTrace(err);
Here is my code:
const fs = require("fs");
const ytdl = require("ytdl-core");
const express = require("express");
var cors = require("cors");
var path = require("path");
const app = express();
var http = require("http").createServer(app);
const io = require("socket.io")(http);
const bodyParser = require('body-parser');
const port = process.env.PORT || 8080;
const adress = '127.0.0.1';
var clientGlob = null;
var destDir = "./Music";
var songs = [];
var songDur = [];
var playing = false;
var curSong = '';
app.use(express.json()); // to support JSON-encoded bodies
app.use(express.urlencoded({ extended: true })); // to support URL-encoded bodies
app.use(cors());
app.use(bodyParser.urlencoded({ extended: true }));
app.get("/", (req, res) => {
res.sendFile(path.join(__dirname,"index.html"));
});
app.post("/downAudio", (req, res) => {
getAudio(req.body.url, res);
});
getAudio = (videoURL, res) => {
console.log(videoURL);
var stream = ytdl(videoURL, {
quality: "highestaudio",
filter: "audioonly",
})
var videoReadableStream = ytdl(videoURL, { filter: 'audioonly'});
ytdl.getInfo(videoURL).then((info) => {
console.log("title:", info.videoDetails.title);
console.log("rating:", info.player_response.videoDetails.averageRating);
console.log("uploaded by:", info.videoDetails.author.name);
var videoName = info.videoDetails.title.replace('|','').toString('ascii');
var videoWritableStream = fs.createWriteStream(destDir + '\\' + videoName + '.mp3');
var stream = videoReadableStream.pipe(videoWritableStream);
stream.on('finish', function() {
res.writeHead(204);
res.end();
});
console.log("File downloaded and added to the queue");
songs.push(destDir + '\\' + videoName + '.mp3');
var duration = parseInt(info.videoDetails.lengthSeconds);
songDur.push(duration*1000);
console.log("Audio added to the queue")
if(!playing)
play();
});
};
play = ()=>{
playing=true;
curSong=songs[0];
setTimeout(playNext(),songDur[0]);
}
playNext = ()=>
{
fs.unlink(curSong, function (err) {
if (err) throw err;
console.log('File deleted!');
});
songs.pop()
songDur.pop();
if(songs.length!=0)
play();
else
playing=false;
}
io.on("connection", (client) => {
clientGlob = client;
console.log("User connected");
});
app.listen(port,adress, () => {
console.log(`Server started, link: ${adress}:${port}`);
});
It downloads the songs fine but it has a problem in the playnext function. I cant relate this error to anything in there. What am I doing wrong?
Also any help into improving the code and performance is welcome.
If needed I will provide more information, thanks!

Fixed the problem, for some reason it didn't like the type of function I used. After making it a normal function playnext(){}... it worked.

Why Will My Script Not Print Errors?? Using JS and MongoDB in Replit

So, recently I've been working on this school project. Nothing too much honestly, as I am not completely fluent in js. But I ran into this tutorial when trying to use the MongoDB database for my site.
After following the guide up to the point where the simple database is finished, there seem to be errors in my code. But for some reason, no errors are being printed, making it very difficult to work on. Here is an example of some of my files:
index.js
const express = require('express');
const app = express();
const server = 0000;
const socket = require('socket.io');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const Users = require('./public/UserModel.js');
let rooms = [];
app.use(express.static('./public'));
app.use(bodyParser.json());
const MongoClient = require('mongodb').MongoClient;
const mongo_username = process.env.MONGO_USERNAME
const mongo_password = process.env.MONGO_PASSWORD
const uri = "mongodb+srv://Killerswordsman9776:<password>#cluster0.r92qc.mongodb.net/Cluster0?retryWrites=true&w=majority";
console.log("grabbed link");
const client = new MongoClient(uri, { useNewUrlParser: true });
let http = require('http').Server(app);
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: true }));
app.set('port', process.env.PORT || server);
http.listen(app.get('port'), function() {
app.post('/index', function (req, res, next) {
client.connect(err => {
const users = client.db("crmdb").collection("users");
let user = { name: req.body.name, email: req.body.email, note: req.body.note };
users.insertOne(user, function(err, res) {
if (err) concole.log("{error}");
console.log("1 user inserted");
});
})
})
console.log('listening on port', app.get('port'));
});
script.js
input = document.createElement('textarea');
input.setAttribute('type', 'text');
input.setAttribute('placeholder', 'Message');
document.body.appendChild(input);
sendBtn = createButton('Send Message');
sendBtn.mousePressed(send);
del = createButton('Delete Messages');
del.mousePressed(deleteMess);
createP('');
info = '<strong><u>Messages:</u></strong><br/>';
output = document.createElement('iframe');
output.setAttribute('scrolling', 'auto');
output.setAttribute('srcdoc', info);
output.setAttribute('title', 'messages');
document.body.appendChild(output);
socket.on('message', (data, color) => {
info += `<strong>${data.handle}</strong>: ${data.value} || <i>${hr}:${min} ${time}</i><br>`;
output.setAttribute('srcdoc', info);
});
}
function send() {
data = {
value: input.value,
handle: username.value
}
socket.emit('message', data);
}
function deleteMess() {
info = '<strong><u>Messages:</u></strong><br/>';
}
function joining() {
if (room.value != '') {
socket.emit('join', room.value);
} else {
socket.emit('join', 'Default Room');
}
}
function draw() {
hr = hour();
min = minute();
if (hr / 12 > 1) {
hr -= 12;
time = 'PM';
} else {
time = 'AM';
}
}
If any other files need viewing, or I'm not including enough information, please let me know and I will fix that. But the main problem I have here is just to get my errors printing. Thx

Cannot send message to client in nodejs with socket.io

I have 2 pages: play page, live page and server. I want to use socket.io to do this: i want to send data from play page to server and then to live and show a text that update automatically when I change it in play page.
play page emit this
var n = <%-JSON.stringify(v1)%>;
var socket = io.connect('http://localhost:3000');
socket.emit('event', { message: n });
server code
var server = app.listen(3000); //port 3000 is only for sockets. my app has web traffic on port 5000.
var io = require('socket.io')(server);
io.on('connection', function(socket) {
socket.on('event', function(data) {
console.log('A client sent us this dumb message:', data.message);
var n = data.message;
console.log("");
console.log("data received from play client..trying to send to live");
console.log("");
console.log("var n is");
console.log(n);
console.log("sending data...");
socket.emit('event', { message: n });
Whatever I do in live page it don't receive message.
I solved 50% of my problem creating another socket in server.js that listen to port 3002 and this worked. But now my content don't update automatically on live page. I have to refresh manually and I don't want this.
This is my new server.js code that worked(without realtime update on live.ejs page):
const express = require('express');
const store = require('./store');
const storeLyric = require('./storeLyric');
const searchF = require('./search');
// middleware to handle HTTP POST request
// extract the entire body portion of an incoming request and exposes it on req.body
const bodyParser = require('body-parser');
const app = express();
app.set('port', (process.env.PORT || 5000));
app.set('view engine', 'ejs');
app.use(express.static('public'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
///new
var server = app.listen(3000);
var io = require('socket.io')(server);
var server2 = app.listen(3002);
var io2 = require('socket.io')(server2);
io.on('connection', function(socket) {
socket.on('event', function(data) {
console.log('A client sent us this dumb message:', data.message);
var n = data.message;
console.log("");
console.log("data received from play client..trying to send to live");
console.log("");
console.log("var n is");
console.log(n);
console.log("sending data...");
io2.on('connection', function(socket2) {
socket2.on('live', function(data2) {
console.log('status from live client:', data2);
socket2.emit('live', n);
});
});
////////////////////
});
});
//end new
////////////
// default page
app.get('/', (req,res) => {
let students = [];
var end = req.query.end;
if(end==1 || end==2){
io2.on('connection', function(socket2) {
socket2.on('live', function(data2) {
console.log('status from live client:', data2);
socket2.emit('live', '');
});
});
}
store.studentList().then((req,respond) => {
students = req;
res.render('pages/index', {
title: '',
students:students
})
})
})
//live page
app.get('/live', function (req, res) {
res.render('pages/live', {
n:'gsgs'
})
})
// search page
app.get('/search', (req,res) => {
let search = [];
var q = req.query.q; // $_GET["q"]
searchF.search(q).then((req,respond) => {
search = req;
res.render('pages/search', {
search:search,
q:q
})
})
})
// play page
app.get('/play', (req,res) => {
let lyrics = [];
var vers = req.query.vers; // $_GET["vers"]
var for_id = req.query.for_id; // $_GET["vers"]
storeLyric.lyrics(for_id, vers).then((req,respond) => {
lyrics = req;
res.render('pages/play', {
title: '',
lyrics:lyrics
})
});
////////
})
app.listen(app.get('port'), () => {
console.log("Listening to port: ", app.get("port"))
});
What I'm doing wrong and why socket.io doesn't work in realtime?
Thanks for help!

You need to emit the event from server side to the client side and then catch data there
var server = app.listen(3000);
var io = require('socket.io')(server);
io.on('connection', function(socket) {
socket.on('event', function(data) {
var n = data.message;
io.sockets.emit('event', message);
});
And then on frontend in live page you write this
var n = <%-JSON.stringify(v1)%>;
var socket = io.connect('http://localhost:3000');
socket.on('event', (data)=>{
console.log(data)
});

Page refresh clears all the data

I'm working on basic chat-application running on express.js and socket.io.
Server-side code:
var express = require("express");
var app = express();
var server = require('http').createServer(app);
var io = require("socket.io").listen(server);
var path = require("path");
app.use(express.static(path.join(__dirname, "public")));
app.set("view engine", "ejs");
server.listen(process.env.PORT || 3000, function() {
console.log("Server listening");
})
app.get("/", function(req, res) {
res.render("chat");
})
io.sockets.addListener("connection", function(socket) {
socket.addListener("chat-message", function(message, nickname) {
io.sockets.emit("chat-message", message, nickname)
})
})
Client-side code:
var socket = io();
var nickname = prompt("Whats your name?");
var input = document.getElementById("text-input");
var container = document.getElementById("chat-container");
input.addEventListener("keydown", function() {
if (event.keyCode == 13) {
event.preventDefault();
if (input.value !== "") {
socket.emit("chat-message", nickname + ": " + input.value);
input.value = "";
}
}
})
socket.addEventListener("chat-message", function(message) {
container.innerHTML += message + "</br>";
})
Is there any way to avoid deleting info from the webpage after refresh?

You can save all the messages and nicknames in a globar variable and send them on every new connection to the socket.
var messages = [];
io.sockets.addListener("connection", function(socket) {
//send messages to new connection
socket.addListener("chat-message", function(message, nickname) {
messages.push({message: message, nickname: nickname});
io.sockets.emit("chat-message", message, nickname)
})
})
[Edit]
Client Side
socket.addEventListener("chat-previous-messages", function(messages) {
for(let i = 0; i < messages.length; i++){
container.innerHTML += messages[i].message + "</br>";
}
})
Server side
var messages = [];
io.sockets.addListener("connection", function(socket) {
socket.emit('chat-previous-messages', messages); //new code
socket.addListener("chat-message", function(message, nickname) {
messages.push({message: message, nickname: nickname});
io.sockets.emit("chat-message", message, nickname)
})
})
Or you can serve the chat page with the messages already displayed
app.get("/", function(req, res) {
res.render("chat", messages);
})
//in the html part something like this
#chat-container
- each message in messages
message.message + '<br>'