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/ 8 Years ago, thu, february 2, 2017, 12:00:00
The problem is that Whenever I try to fire this.io.emit event a TypeError occurs. It gives only while I write this statement this.io.emit inside socket.on block otherwise, if I write it outside this block it generates no error.
This is the main server.js file to call the other libraries:
const express = require('express'),
http = require('http'),
socketio = require('socket.io');
class App{
constructor()
{
this.port = process.env.PORT || 81;
this.host = `localhost`;
this.app = express();
this.http = http.Server(this.app);
this.socket = socketio(this.http);
}
appConfig(){
new config(this.app);
}
appRoutes(){
new routes(this.app,this.socket).routesDefault();
}
appDefault(){
this.appConfig();
this.appRoutes();
this.http.listen(this.port,this.host,()=> {
console.log(`Listening`);
});
}}
my server side code is:
'use strict';
class Routes {
constructor(app,socket) {
this.app = app;
this.io = socket;
this.users=[];
}
routesTemplate()
{
this.app.get('/',function(req,res){
res.render('index');
});
}
socketEvents()
{
this.io.on('connection',(socket) => {
socket.on('send message',function(data)
{
this.io.emit('new message',data);//here the error lies.
});
});
}
routesDefault()
{
this.routesTemplate();
this.socketEvents();
}}
module.exports = Routes;
I also tried to access this.users.The length inside socket.on the statement and it generated the same TypeError: cannot read property length. I have no idea why it is occurring. Please help me to resolve this problem.
Client Side:
<script>
$(function($){
var socket = io.connect();
var $messageForm = $('#send-message');
var $messageBox = $('#message');
var $chat = $('#chat');
$messageForm.submit(function(e){
e.preventDefault();
socket.emit('send message',$messageBox.val());
$messageBox.val();
});
socket.on('new message',function(data){
$chat.append(data+ <br/>);
});
});
</script>
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