How to disconnect the user by emitting disconnect event in socket.io - node.js

Below is my server script. I want to show " a particular user has left the chat" by clicking leave button index.html which is emitting 'disconnect' event. But this doesn't seem to work. I guess it implies that default event can't be emitted. Plz help me do that. Any sort of help is appreciated.
socket.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.on('connection',function(socket)
{
//console.log("user connected")
socket.on('new user', function(data) {
console.log(data);})
socket.on('disconnect', function(data) {
console.log(data);
})
})
http.listen(3000, function(){
console.log('listening on *:3000');
})
index.html
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<style>
</style>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io.connect();
//
$(function(){
$('#join').click(function(){
var name= $('input').val();
socket.emit('new user', name + ' has just joined the chat');
})
$('#leave').click(function(){
var name= $('input').val();
socket.emit('disconnect', name + ' has left the chat');
})
})
</script>
Choose your username <input type="text">
<button id="join" type="submit">
Enter
</button>
<button id="leave" type="submit">
Leave
</button>
</body>

try this
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.on('connection', function(socket){
socket.on('new user', function(data) {
console.log(data)
})
socket.on('disconnect', function(data) {
console.log(data)
})
http.listen(3000, function(){
console.log('listening on *:3000');
})
}

Related

Socket.io getting disconnected unexpectedly

<body>
<ul id="messages"></ul>
<form action="">
<input id="m" autocomplete="off" /><button onclick="message()">Send</button>
</form>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io();
var message = function(){
var msg = document.getElementById("m").value;
if(msg !== ""){
alert(msg);
socket.emit('chat message',msg);
}
document.getElementById("m").value="";
}
socket.on('display',function(value){
console.log(value);
document.getElementById("messages").innerHTML += "<li>"+value+"</li>";
})
</script>
This is my index.html page to design a group chat using socket.io
var express = require('express');
var app = express();
var http = require('http').createServer(app);
var io = require('socket.io')(http);
app.get('/', function(request, response) {
response.sendFile(__dirname + '/index.html');
});
io.on('connection',function(socket){
console.log('a user connected');
socket.on('chat message',function(msg){
console.log('message: '+msg);
io.emit('display',msg);
});
socket.on('disconnect',function(){
console.log('user disconnected')
})
});
http.listen(3000, function() {
console.log("listening on 3000");
});
This is my index.js file. The user is getting disconnected each time a message is sent. Any suggestions why this happened
Thanks in advance
Add message(event) to your form:
<form action="">
<input id="m" autocomplete="off" /><button onclick="message(event)">Send</button>
</form>
and change your message function to:
var message = function(event){
event.preventDefault();
var msg = document.getElementById("m").value;
if(msg !== ""){
alert(msg);
socket.emit('chat message',msg);
}
document.getElementById("m").value="";
}
The default html method when you submit a form is GET. When express receives GET it resends index.html to the browser and the page refreshes. We can change it with event.preventDefault(). It should work now.
You shouldn't do:
io.emit
You should do:
socket.emit

HTML button communicating with Node server + Socket.io

When a user clicks an html button (#new) I want to store their socket.id into an array (userQueue) on my node server but I'm having trouble figuring out how to do this. Do I need to set up a post request or is there a way through socket.io?
App.js (Server):
// App setup
var express = require('express'),
socket = require('socket.io'),
app = express(),
bodyParser = require("body-parser");
var server = app.listen(3000, function() {
console.log('listening to requests on port 3000');
});
var io = socket(server);
app.use(bodyParser.urlencoded({extended: true}));
app.use(express.static('public'));
// Room Logic
var userQueue = [];
io.on('connection', function(socket) {
console.log('made socket connection', socket.id);
socket.on('chat', function(data) {
io.sockets.emit('chat', data);
});
socket.on('typing', function(data) {
socket.broadcast.emit('typing', data);
});
});
Chat.js (client side):
// Make connection
var socket = io.connect('http://localhost:3000');
// Query DOM
var message = document.getElementById('message');
handle = document.getElementById('handle'),
btn = document.getElementById('send'),
btnNew = document.getElementById('new'),
output = document.getElementById('output'),
feedback = document.getElementById('feedback');
// Emit events
btn.addEventListener('click', function(){
socket.emit('chat', {
message: message.value,
handle: handle.value
});
});
message.addEventListener('keypress', function() {
socket.emit('typing', handle.value);
});
// Listen for events
socket.on('chat', function(data) {
feedback.innerHTML = ""
output.innerHTML += '<p><strong>' + data.handle + ':</strong>' + data.message + '</p>'
});
// Emit 'is typing'
socket.on('typing', function(data) {
feedback.innerHTML = '<p><em>' + data + ' is typing a message...</em></p>'
});
Index.html:
<!DOCTYPE html>
<html>
<head>
<title>WebSockets 101</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.3/socket.io.js"></script>
<link rel="stylesheet" type="text/css" href="/styles.css">
</head>
<body>
<div id="mario chat">
<div id="chat-window">
<div id="output"></div>
<div id="feedback"></div>
</div>
<input id="handle" type="text" placeholder="Handle">
<input id="message" type="text" placeholder="Message">
<button id="send">Send</button>
<button id="new">New</button>
</div>
<script type="text/javascript" src="/chat.js"></script>
</body>
</html>
I believe that a post request will probably work as well, but if you want to simply work with socket.io you can consider doing something similar to your chat event by adding this in your chat.js:
btnNew.addEventListener('click', function() {
socket.emit('new user', socket.id);
});
And on the server side, app.js:
socket.on('new user', function(id) {
userQueue.push(id);
});
And it should be stored in the array. Hope this helps!

Append a div with an array in Node.js

I am creating a chat where there will be a div that displays the users that have connected to the server. The user's name is being taken from a prompt. I have managed to push each connected user to the array but can't figure out how to display that array. At the moment it only appends the div with the name of the individual user but I want them all to be displayed.
<body>
<div id="chatlog" class="col-sm-9">
<ul id="messages"></ul>
</div>
<div id="online" class="col-sm-3">
<div id="username"></div>
</div>
<form class="col-sm-12" action="">
<input id="type" type="text" />
<input type="submit" id="submit" />
</form>
<script>
var socket = io();
var user = prompt("What's your name?");
$('form').submit(function() {
socket.emit('chat message', $('#type').val());
$('#type').val('');
return false;
});
socket.on('chat message', function(msg) {
$('#messages').append($('<li>').text(msg));
});
socket.emit("join", user);
socket.on("join", function(user) {
$("#username").append($("<p>").text(user));
})
</script>
</body>
server.js
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var express = require("express");
var port = 3000;
var onlineUsers = [];
console.log(onlineUsers);
app.use(express.static(__dirname + '/'));
app.get('/', function(req, res) {
res.sendFile(__dirname + '/index.html');
});
io.on('connection', function(socket) {
console.log('a user connected');
socket.on("join", function(user) {
socket.emit("join", user);
onlineUsers.push(user);
console.log(onlineUsers);
});
socket.on('chat message', function(msg) {
console.log('message: ' + msg);
io.emit('chat message', msg);
});
socket.on('disconnect', function() {
console.log('user disconnected');
});
});
http.listen(port, function() {
console.log('listening on *:' + port);
});
I am also open to suggestions how to do this another way but node.js is very new to me and think this might be the easiest way.
Send the array of users back to the clients when a user joins. This way all clients will have a updated user list every time a user joins. Below is a suggestion on how you could implement this
server:
socket.on("join", function(user) {
onlineUsers.push(user);
io.emit("user list", onlineUsers);
});
client:
socket.emit("join", user);
socket.on('user list', function(onlineUsers) {
$("#username").empty();
for(var i=0;i<onlineUsers.length;i++){
$("#username").append($("<p>").text(onlineUsers[i]));
}
});

socket io not parse string and any characters

I want send simple message to node.js console from html. But number is working , string and any characters not working,
Display message is
message: NaN
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', function(req, res){
res.sendFile('sample.html', {
root:'/home/deneebo/Documents/apidevelopment/nodejs'});
});
io.on('connection', function(socket) {
socket.on('chat message', function(msg) {
console.log('message: ', + msg);});
});
http.listen(3000, function(){
console.log('listening on *:3000');
});
below html code
<!doctype html>
<html>
<head>
<title>Socket.IO chat</title>
</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="http://code.jquery.com/jquery-1.11.1.js"></script>
<script>
var socket = io();
$('form').submit(function(){
socket.emit('chat message', $('#m').val());
alert($('#m').val());
$('#m').val('');
return false;
});
</script>
</body>
</html>
I tried your code my local work well
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', function(req, res){
res.sendfile('stack.html', {root: __dirname });
});
io.on('connection', function(socket) {
socket.on('chat message', function(msg) {
console.log('message: ', msg);}); //Remove + from here
});
http.listen(3000, function(){
console.log('listening on *:3000');
});

How to write tests: Socket.io app unit testing

I am trying to make simple chat app using socket.io. Manually it's working fine (via browser localhost:3000/) but I want to write unit tests to verify logic of the server. I don't know which tools/libraries to use for testing.
Here is my node server code:
index.js
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var socketCount = 0;
http.listen(3000, function(){
console.log('listening on *:3000');
});
app.get('/', function(req, res){
res.sendFile(__dirname + '/index.html');
});
io.on('connection', function(socket) {
socketCount++;
console.log('new user connected');
// Let all sockets know how many are connected
io.emit('users connected', socketCount);
socket.on('disconnect', function(){
// Decrease the socket count on a disconnect, emit
socketCount--;
io.emit('users connected', socketCount);
});
socket.on('chat message', function(msg){
// New message added, broadcast it to all sockets
io.emit('chat message', msg);
});
});
And here is my html page:
file: index.html
<html>
...
<body>
<ul id="messages"></ul>
<div class='footer'>
<div id="usersConnected"></div>
<form action="">
<input id="m" autocomplete="off" /><button>Send</button>
</form>
</div>
</body>
...
<script>
$(document).ready(function(){
$('#messages').val('');
var socket = io();
$('form').submit(function(){
socket.emit('chat message', $('#m').val());
$('#m').val('');
return false;
});
// New message emitted, add it to our list of current messages
socket.on('chat message', function(msg){
$('#messages').append($('<li>').text(msg));
});
// New socket connected, display new count on page
socket.on('users connected', function(count){
$('#usersConnected').html('Users connected: ' + count);
});
});
</script>
</html>
Thanks.
I had this problem: How to do unit test with a "socket.io-client" if you don't know how long the server take to respond?.
I've solved so using mocha and chai:
var os = require('os');
var should = require("chai").should();
var socketio_client = require('socket.io-client');
var end_point = 'http://' + os.hostname() + ':8081';
var opts = {forceNew: true};
describe("async test with socket.io", function () {
this.timeout(10000);
it('Response should be an object', function (done) {
setTimeout(function () {
var socket_client = socketio_client(end_point, opts);
socket_client.emit('event', 'ABCDEF');
socket_client.on('event response', function (data) {
data.should.be.an('object');
socket_client.disconnect();
done();
});
socket_client.on('event response error', function (data) {
console.error(data);
socket_client.disconnect();
done();
});
}, 4000);
});
});

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