CODEWITHSUNDEEP
angularjsnode.jsexpresssocket.io
Dylan Lott
Dylan Lott

Reputation: 421

Socket.io + Express + Node + Angular notifications

I have an app where I'm trying to make a queue system for customers. I am trying to make it so that when a customer joins the queue, it notifies the store employees of the join and let's them know to get on it and help the customer as soon as possible.

I can't seem to get Socket IO to talk with my front end at all, though.

Here's the code I have, and I can't even get Node to recognize Socket as a library. I've followed 3 different tutorials, and tried them all, but I can't see what's being done wrong in my server code.

Here's what I'm doing in my server that's related to Socket.io 

var express = require('express');
var app = express();
var io = require('socket.io'); 


io.on('connection', function(socket){

    socket.emit('connection', "Connection created.")
    console.log("Socket.io is GO");

    socket.on('add customer', function(customer){
        console.log("Customer added", customer); 

    })

    socket.on('notification', function(data) {
        console.log("NEW CUSTOMER IN THE QUEUE", data);
    });

});

I can't seem to get it to run in my server, and when it DID run, it didn't show any of the socket.on events that I had in there and it wouldn't console.log anything.

What am I doing wrong? Has anyone successfully gotten Socket to play nicely with Express and Angular together?

Upvotes: 6

Views: 19475

Answers (2)

Wilson
Wilson

Reputation: 9136

Looks like your code is incomplete or maybe you didn't implement well.

I created an example using angular.js, express, and socket.io trying to replicate your requirement.

This is my server, app.js:

var express = require('express');
var app = express();
var server = require('http').Server(app);
var io = require('socket.io')(server);

app.use(express.static(__dirname + '/public'));

io.on('connection', function(socket) {
  console.log('new connection');

  socket.on('add-customer', function(customer) {
    io.emit('notification', {
      message: 'new customer',
      customer: customer
    });
  });
});

server.listen(4041, function() {
  console.log('server up and running at 4041 port');
});

Then I created a public folder with the following files:

public/index.html

<!doctype>
<html ng-app="sampleApp">
  <head>
  </head>

  <body ng-controller="IndexController">
    <label>Please enter your name: </label>
    <input ng-model="currentCustomer.name"/>
    <button ng-click="join()">Join</button>
    <br/>

    <h1>New Customers: </h1>
    <ul>
      <li ng-repeat="customer in newCustomers">{{customer.name}}</li>
    </ul>

    <script src="https://cdn.socket.io/socket.io-1.3.5.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.1/angular.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.1/angular-route.js"></script>
    <script src="app.js"></script>
  </body>

</html>

public/app.js

var app = angular.module('sampleApp', ['ngRoute']);

app.config(['$routeProvider', function($routeProvider) {
  $routeProvider.when('/', {
    templateUrl: '/index.html'
  });
}]);

app.factory('socket', ['$rootScope', function($rootScope) {
  var socket = io.connect();

  return {
    on: function(eventName, callback){
      socket.on(eventName, callback);
    },
    emit: function(eventName, data) {
      socket.emit(eventName, data);
    }
  };
}]);

app.controller('IndexController', function($scope, socket) {
  $scope.newCustomers = [];
  $scope.currentCustomer = {};

  $scope.join = function() {
    socket.emit('add-customer', $scope.currentCustomer);
  };

  socket.on('notification', function(data) {
    $scope.$apply(function () {
      $scope.newCustomers.push(data.customer);
    });
  });
});

Upvotes: 12

Blubberguy22
Blubberguy22

Reputation: 1332

You need to set up your socket.io server so that it is listening on a specific port; without it listening, it can't watch for clients connection and emmitting messages. You should change your code as follows to fix this:

var app = require('express')();
var server = require('http').Server(app);
var io = require('socket.io')(server);

//Existing Code

server.listen(1337, function(){
    console.log('listening on *:1337');
});

Upvotes: 1

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