printing a variable into a div - javascript

I am atempting to build a chatroom with NodeJS and Socket.io and I have gotten so far as to get the users input and send it to the Node server but that's all I want to be able to display it up in a div
Client-side script
var socket = io();
$('form').submit(function(e) {
e.preventDefault();
// gets the value from the message text feild and sets it as the message var
var message = {
text: $('#chat-box-div-txtinpt').val()
}
if (message.text.trim().length !== 0) {
socket.emit('chat-message', message);
}
$('#chat-box-div-txtinpt').focus();
document.getElementById('chat-box-div-txtinpt').value='';
});
Server-side script
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', function(req, res) {
res.sendfile('index.html');
});
http.listen(3000, function() {
console.log('listening on *:3000');
});
io.on('connection', function (socket) {
console.log('a user connected');
socket.on('disconnect', function () {
console.log('user disconected');
});
socket.on('chat-message', function (message) {
console.log('message: ' + message.text);
});
});
Here is the site

It appears you're using jQuery, so for this line: document.getElementById('chat-box-div-txtinpt').value=''; you could just do $('#chat-box-div-txtinpt').val('');
to answer your question: you could just do $('#chatlog-display-div').append(message.text)
Your code would end up looking something like this
$('form').submit(function(e) {
e.preventDefault();
//gets the value from the message text feild and sets it as the message var
var message = {
text : $('#chat-box-div-txtinpt').val()
}
if (message.text.trim().length !== 0) {
socket.emit('chat-message', message);
//append the message to the chatlog-display-div
$('#chatlog-display-div').append(message.text);
}
//clear the value of the txtinput after you focus it.
$('#chat-box-div-txtinpt').focus().val('');
});
please mark as accepted answer if you feel this adequately solves the issue.

To send messages to everyone from the server use emit() from io
on server
socket.on('chat-message', function (message) {
console.log('message : ' + message.text);
io.emit("chat-message",message);
});
on client
socket.on('chat-message',function(message){
//add message to the chat window
});
If you do not want the person sending the message to get the chat-message emit then use broadcast.emit() from the socket that sent it
//server
socket.on('chat-message', function (message) {
console.log('message : ' + message.text);
//excludes "socket" from getting the emit
socket.broadcast.emit("chat-message",message);
});
To actually put the message in the div just use any of jQuery's various methods html()/text()/append()
//client
socket.on('chat-message', function (message) {
jQuery(".chat-window").append('<div>'+message.text+'</div>');
});

You could simple .append the text to "chatlog-display-div" with a templet if you use ES6 could be something like
$('form').submit(function(e) {
e.preventDefault();
//gets the value from the message text feild and sets it as the message var
var message = {
text : $('#chat-box-div-txtinpt').val()
}
if (message.text.trim().length !== 0) {
socket.emit('chat-message', message);
document.getElementById('chatlog-display-div').append('<divclass="message-style" > ${message.text}</div>')
}
$('#chat-box-div-txtinpt').focus();
document.getElementById('chat-box-div-txtinpt').value='';
});

Related

Emit to a specific room using SocketIo

I'm trying to allow users on client-side pages to chat with other users on the same page (a room), but not with users on different pages. Right now my socket is emitting across all pages. I'd like to confine the emissions to one room for each page.
App.js server side code
const io = require('socket.io')(server, { cors: { origin: "*"}});
io.on('connection', (socket) => {
socket.on('chat message', (msg) => {
io.emit('chat message', msg);
});
});
Client side tag
<script src="/javascripts/socketIo.js"></script>
SocketIo.js
const socket = io();
const messages = document.getElementById('messages');
const form = document.getElementById('form');
const input = document.getElementById('input');
socket.on('connection', (socket) => {
socket.join(room);
});
form.addEventListener('submit', function (e) {
e.preventDefault();
if (input.value) {
const alias = socket.id.slice(-5);
socket.emit('chat message', alias + ": " + input.value);
input.value = '';
}
});
socket.on('chat message', function (msg) {
const item = document.createElement('ul');
item.textContent = msg;
messages.appendChild(item);
window.scrollTo(0, document.body.scrollHeight);
});
The current code sends messages to all users (no rooms). If I update the code below to include prefix "socket.to" like the docs instruct, messages stop sending altogether.
from
socket.emit('chat message', alias + ": " + input.value)
to
socket.to(room).emit('chat message', alias + ": " + input.value)
How do I get socket to send the messages to page-specific rooms?

socket.emit and socket.on is not connected

I was adding a chat page in my existing express app using socket.io.
My server code :
var io = socket(server);
io.on('connection', (socket) => {
console.log('made socket connection', socket.id);
// Handle chat event
socket.on('chat', function(data){
console.log("second");
io.sockets.emit('chat', data);
});
});
and my client code :
var socket = io.connect("http://localhost:3000/chat")
//Query elements
var message = document.getElementById('message'),
btn = document.getElementById('send'),
output = document.getElementById('output');
btn.addEventListener("click", function(){
socket.emit('chat', {
message: message.value,
});
console.log("First")
message.value = "";
})
socket.on('chat', function(data){
console.log("final function")
output.innerHTML += `<p>${data.message}</p>`;
});
socket.emit is fired on click in client side but socket.on in server doesn,t run.
Note : console.log('made socket connection', socket.id); run normally
there is an issue in your client side . you are trying to connecting with namsespaces "chat" , remove chat
var socket = io.connect("http://localhost:3000")

Express not doing anything but sending HTML file

I'm using an app.post method in Express like so:
app.post('/race', function(req,res) {
let raceResponse = {
user_name: req.body.userName
}
console.log('Express has received race.');
//Socket.IO
let race = io.of('/race').on('connection', (socket) => {
console.log('A user has entered the race!');
socket.on('racePageReady', function() {
console.log('race page ready recieved');
socket.emit('racePageInfo', raceResponse);
});
socket.on('createRoom', function(roomName) {
socket.join(roomName);
let clients = io.sockets.adapter.rooms[roomName].sockets;
console.log("A room with the name " + roomName + "was created.");
console.log(clients);
socket.emit('roomCreated', clients);
});
socket.on('joinRoom', function(roomName) {
socket.join(roomName);
let clients = io.sockets.adapter.rooms[roomName].sockets;
console.log('A user joined the room with the name: ' + roomName + ". The user's name is " + raceResponse.user_name);
console.log(clients);
socket.emit('roomCreated', clients);
});
});
res.sendFile(path.join(__dirname, '/client/race/index.html'));
}
The page is being sent fine, but the console.log and all the other Socket.IO stuff just doesn't happen. I'm finding this peculiar, because I have a different app.post method that works just fine, all console.logging and Socket.IO business happens. Here's the code:
app.post('/city', function(req,res) {
let cityResponse = {
user_name: req.body.userName
}
console.log('Express has received city.');
//Socket.IO
let city = io.of('/city').on('connection', (socket) => {
socket.id = Math.random();
socket.name = cityResponse.user_name;
SOCKET_LIST[socket.id] = socket; //defined earlier
User.onConnect(socket); //defined earlier
socket.on('cityPageReady', function() {
socket.emit('cityPageInfo', cityResponse);
console.log('city page ready recieved');
});
console.log('A user has connected to the city!');
console.log("Socket: " + socket);
console.log("Socket ID: " + socket.id);
console.log("SOCKET_LIST: ");
console.log(SOCKET_LIST);
socket.on('chat message', function(msg, user) {
console.log('User ' + user + ' sent the message : ' + msg);
socket.emit('chat message', msg, user);
});
});
res.sendFile(path.join(__dirname, '/client/city/index.html'));
});
As far as I can tell, both methods look pretty much the same, except for the Socket.IO stuff in the middle. I'm fairly certain that the io.of method is correct, as it's working for the City page, but not the race.
The only other difference is the way that the two pages are accessed. The City page is accessed through a HTML form with an action attribute, whereas the Race page is accessed through a HTML link (on the City page) with a href attribute.
Both methods are shown below:
CITY
<form id="cityForm" action="http://localhost:4000/city" method="POST">
User name: <input type="text" name="userName">
button type="submit" id="formSubmit">Submit</button>
</form>
RACE
<div><a href="http://localhost:4000/race"></div>
Can anyone see why this peculiar behaviour is occuring? If any other information is needed please let me know so that I can include it.
When clicking an on HTML link, the browser does a GET HTML request. When you submit a Form (with method="POST"), the browser does a POST request.
When using app.post(), you tell express to listen for POST requests. If you want express to listen for GET requests, you should use app.get()

Not showing client welcome message in socket.io / node.js

i made a primitive chatroom in nodejs and socket.io here and i am trying to get it to display the username and a welcome message to just the user as well as a message that shows all the other users that he/she joined here is my code
server code
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var usernames = {};
app.get('/', function(req, res){
res.sendfile('index.html');
});
http.listen(3000, function(){
console.log('listening on *:3000');
});
io.on('connection', function (socket) {
socket.on('adduser', function(username){
socket.username = username;
socket.broadcast.emit('updatechat', 'SERVER', username + ' has connected to this room' + '<hr>');
socket.emit('welcomeuser', 'SERVER Welcome', username + '<hr>');
});
console.log('a user connected');
socket.on('disconnect', function () {
console.log('user disconected');
});
socket.on('chat-message', function (message) {
console.log('message : ' + message.text);
//excludes "socket" from getting the emit
socket.broadcast.emit("chat-message",message);
});
});
and here is my client code
var username = "";
var socket = io();
socket.on('connect', function(){
socket.emit('adduser', prompt("What's your name?"));
});
socket.on('updatechat', function (username, data) {
$('#chatlog-display-div').append('<b>'+username + ':</b> ' + data + '<br>');
});
socket.on('welcomeuser', function(username, data){
jQuery("#chatlog-display-div").append( username +'<hr>');
});
$('form').submit(function(e) {
e.preventDefault();
//gets the value from the message text feild and sets it as the message var
var message = {
text : $('#chat-box-div-txtinpt').val()
}
if (message.text.trim().length !== 0) {
socket.emit('chat-message',message);
//append the message to the chatlog-display-div
$('#chat-box-div-txtinpt').focus().val('');
jQuery("#chatlog-display-div").append('<div>'+message.text+'</div><hr>');
}
});
//clear the value of the txtinput after you focus it.
socket.on('chat-message', function (message) {
jQuery("#chatlog-display-div").append('<div>'+message.text+'</div><hr>');
});
can someone please help me

node, socket.io - update client when new entry added to news feed?

I've created client and server of node with socket.io. server is executing 4 get requests of news feed and fetched the data. These data is sent to the client with socket.io.
client is displaying news feed on the occurrence of specific socket.io event.
This works well for once. Here is the code and working fiddle
server.js
var app = require('http').createServer(handler)
, io = require('socket.io').listen(app)
, fs = require('fs')
, redis = require("redis");
var http = require("http");
// initialize the container for our data
var data = "";
var nfs = [
"http://economictimes.feedsportal.com/c/33041/f/534037/index.rss",
"http://www.timesonline.co.uk/tol/feeds/rss/uknews.xml",
"http://www.independent.co.uk/news/business/rss",
"http://www.dailymail.co.uk/money/index.rss"
];
//setInterval(function() {
for(var i=0; i<nfs.length; i++){
//console.log(nfs[i]);
http.get(nfs[i], function (http_res) {
// this event fires many times, each time collecting another piece of the response
http_res.on("data", function (chunk) {
// append this chunk to our growing `data` var
data += chunk;
});
// this event fires *one* time, after all the `data` events/chunks have been gathered
http_res.on("end", function () {
// you can use res.send instead of console.log to output via express
console.log("data received");
});
});
}
//}, 30000);
app.listen(8080);
function handler (req, res) {
fs.readFile(__dirname + '/client.html',
function (err, data) {
if (err) {
res.writeHead(500);
return res.end('Error loading index.html');
}
res.writeHead(200);
res.end(data);
});
}
io.on('connection', function (socket) {
//setInterval(function() {
socket.emit('news', data);
/*socket.on('my other event', function (data) {
console.log(data);
});*/
//}, 5000);
});
client.html
<html>
<head>
<script src="https://cdn.socket.io/socket.io-1.2.1.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script>
//socket io client
var socket = io.connect('http://localhost:8080');
//on connetion, updates connection state and sends subscribe request
socket.on('connect', function(data){
setStatus('connected');
socket.emit('subscribe', {channel:'notif'});
});
//when reconnection is attempted, updates status
socket.on('reconnecting', function(data){
setStatus('reconnecting');
});
//on new message adds a new message to display
socket.on('news', function (data) {
console.log(data);
//socket.emit('my other event', { my: 'data' });
addMessage(data);
});
/*socket.on('news', function (data) {
debugger;
socket.emit('my other event', { my: 'data' }
var msg = "";
if (data) {
msg = data;
}
addMessage(msg);
});*/
//updates status to the status div
function setStatus(msg) {
$('#status').html('Connection Status : ' + msg);
}
//adds message to messages div
function addMessage(msg) {
//debugger;
var $xml = $(msg);
var html = '';
$xml.find("item").each(function() {
var $item = $(this);
html += '<li>' +
'<h3><a href ="' + $item.find("link").text() + '" target="_new">' +
$item.find("title").text() + '</a></h3> ' +
'<p>' + $item.find("description").text() + '</p>' +
// '<p>' + $item.attr("c:date") + '</p>' +
'</li>';
});
$('#result').prepend(html);
}
</script>
</head>
<body>
<div id="status"></div><br><br>
<ul id="result"></ul>
</body>
</html>
What I understand about socket.io is that we don't need long server polling and so how do server come to know that news is added to the respected news feed.
How do I update the client with newly added news when news is added to the news feed rss ???
Update
Ok so from all the responses I get the point that it is not possible for socket.io to know that new entry has been added. So, how do I know (which tools/libraries do require to know that new entry has beed added and update the client as well) ???
Retrieving the messages from the news feeds are completely independent of socket.io unless the news feeds implement sockets on their end and your server becomes their client. So you will have to continue to poll them with http requests to know whether they have updated data.
In order to notify your clients of the update you would just emit the news event. Presumably you would have logic on the server to make sure you are only sending events which have not previously be sent.
There is no way for "node" to know when a new entry is added to the news feed. You will have to poll the news service like you are doing now. This really has nothing to do with Node or Socket.io unless I completely misunderstand what you are asking.

Categories