Node.js, Socket.io emit not working

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I am making a website in Socket.io. But emit method not working in my code. I can't see any errors in my code. Here is my server code.

var io = require("socket.io").listen(server);

//Some external codes for running server in Node.js

io.on("connection", function(socket) {
    //This line is working.
    console.log("Socket connected.");

    io.on("requestNewMap", function(data) {
        //Create new map object in here.
        io.emit("responseNewMap", { mapData: map });
    });
});

And this is my client side javascript code.

var socket = io();

socket.on("responseNewMap", function(data) {
    var map = data.mapData;

    //Draw map in canvas's context.
});

//setInterval runs this method every 2 seconds.
function requestNewMap() {
    socket.emit("requestNewMap");
}

This part could be wrong:

io.on("requestNewMap", function(data) {
    //Create new map object in here.
    io.emit("responseNewMap", { mapData: map });
});

I would use socket there as in:

socket.on("requestNewMap", function(data) {
    //Create new map object in here.
    socket.emit("responseNewMap", { mapData: map });
});

I think io.emit should work fine, it would just send the response to every connected client, but io.on('requestNewMap',...) won't work since requestNewMap is not an io standard event.

Node.js - Socket.io io.emit() doing nothing, I'm having a problem with my socket.io applicaiton, the io.emit(), and io.sockets. emit() straight up do not work, they do nothing, and return no� I am new to sockets, so I'm not certain they would come through, but I'm also not seeing any network activity, which makes me think that the failure is in the server's emit, not on my client. Of note, I'm using the socket.io-client lib on the client, but I assumed these are compatible.

change this

io.on("requestNewMap", function(data) {
    //Create new map object in here.
    io.emit("responseNewMap", { mapData: map });
});

into this

socket.on("requestNewMap", function(data) {
    //Create new map object in here.
    socket.emit("responseNewMap", { mapData: map });
});

you are adding an event listener to the server object not the client socket.

Emit cheatsheet, io.on('connect', onConnect);function onConnect(socket){ // sending to the client WARNING: `socket.to(socket.id).emit()` will NOT work, as it will send to everyone in the room sending to all clients on this node (when using multiple nodes) // WARNING: `socket.to(socket.id).emit()` will NOT work, as it will send to everyone in the room // named `socket.id` but the sender. Please use the classic `socket.emit()` instead.

I'm not certain, but I believe your problem is that your function on the client side is written like you are expective 'requestNewMap' to be passing along data. Instead of:

io.on("requestNewMap", function(data){

Try:

io.on("requestNewMap", function(){

OR pass an empty object or some other kind of junk data along with the emit from client side like this:

function requestNewMap() {
  socket.emit("requestNewMap", {});
}

function requestNewMap() {
  socket.emit("requestNewMap", undefined);
}

function requestNewMap() {
  socket.emit("requestNewMap", -1);
}

Hopefully this is helpful and correct!

Edit: This turned out to not be the answer to your question, but still something worth considering. If you're not passing data along you should avoid writing the event handler as if it expects data.

Nodejs/Socket.emit not working, data not found � Issue #1806 , So I'm currently getting uuid and rssi from Beacon and send it to the server using socket.io Actually I get the necessary data : when I test in� Socket.IO provides additional features over a plain WebSocket object, which are listed below. But first, let’s detail what the Socket.IO library is not. What Socket.IO is not. Socket.IO is NOT a WebSocket implementation. Although Socket.IO indeed uses WebSocket as a transport when possible, it adds additional metadata to each packet.

This works fine only you want to send the "responseNewMap" event back to the sender only.

socket.on("requestNewMap", function(data) {
    //Create new map object in here.
    socket.emit("responseNewMap", { mapData: map });
});

Implement this if you want to send the event back to all connected users

socket.on("requestNewMap", function(data) {
    //Create new map object in here.
    io.emit("responseNewMap", { mapData: map });
});

If you use a namespace like this:

io.of('/api/v1/chat').on('connection', function (socket) { 
//Your code here
});

Then include a namespace like this:

io.of('/api/v1/chat').emit("responseNewMap", { mapData: map })

cant emit data from python (sio.emit('test data', 'data') to nodejs , https://stackoverflow.com/questions/43414318/node-js-socket-io-emit-not- working. So I've found a solution. I had a wrong server code. It should� I'm working on a simple Node.js bi-directional client\server communication channel and I'm attempting to use socket.io on the server and socket.io-client on the client. I've inserted the code below, as you'll see it's pretty basic stuff, and I'm running both on my local machine - to minimise complexity.

Socket.io node.js socket.emit not working - node.js - html, But , the other way around is not working. for some reason , sending data from client to client does not work. here is the client.js let io = require('socket.io-� Related Searches to Simple Way to Emit Messages By User Id Socket io emit to specific socket id Socket io sending messages to individual clients socket io broadcast to specific users how to get socket id Socket io private chat example socket io emit to specific client Socket io send message to all clients socket io send message to server Socket io emit to room Socket io join multiple rooms

Socket.io Client.emit not working inside if loop - node.js - html, I am starting with Node.js. I want to emit some data to client at the starting of every hour. var d = new Date(); var a=d.getDate(); var h = d.getHours(); if(h<10){� Hi, I am using version 1.4.4 and none of the above methods work for me. I want to get a reference to a socket using it's socket.id. All the above methods mentioned here does not work. What I really want to do is get a socket reference of one namespace from another namespace. A tutorial gives the following code snippet, but uses 0.9.x version.

Everything You Need To Know About Socket.IO, Node.js io.on("connection", function(socket) { io.emit(“user connected”); });. If you want to To solve this problem you need to have a pub/sub store (e.g. Redis). Among those options: The pingTimeout and pingInterval parameters will impact the delay before a client knows the server is not available anymore. For example, if the underlying TCP connection is not closed properly due to a network issue, a client may have to wait up to pingTimeout + pingInterval ms before getting a disconnect event.

Comments
  • did you try emitting outside of connection, by the way put a log inside connection, if there is no log, there then there is no connection being made
  • But when i call io() it connects server successfully. My console.log() working well.
  • He's connecting fine, he's connecting to the url and port of his web server.
  • Oh. It's true. I forgot to use socket.on() in my code. I will try and see if it works. I changed io.on() with socket.on() and it works. Thanks.
  • You guys are right, I always enter the address, I didn't know you could do it without specifying the address :) Deleting the first part from the answer