值未使用socket.io在angularJS中自动更新

Question

Following is my angularJS code with socket.io which is only fetching value when I switch from a view, though I was expecting it to update the value automatically. Let me know what I am doing wrong here -

angular.module("app").controller("DashboardController", function($scope, SessionService) {
    $scope.user = SessionService.currentUser;

  // Code for realtime notifications
  if (SessionService.currentUser._id) {
      var socket = io('http://localhost:6868');
          socket.emit('get notifications', {user_id: SessionService.currentUser._id});
      socket.on('notification data', function(data){
          $scope.$apply(function() {
              $scope.notificationCount = data.length;
          });
      });
  }     
});

Answer 1

I dont think you need to do $scope.$apply here. You can assign the new value without this. Socket looks better here as an angularjs factory.

Look into this code to know how to use socket as a factory.

https://github.com/sojharo/Simplest-Mean/blob/master/public/javascripts/MyAngularApp.js

Keep things separate