AngularJS Service Passing Data Between Controllers

Question

When using an AngularJS service to try and pass data between two controllers, my second controller always receives undefined when trying to access data from the service. I am guessing this is because the first service does a $window.location.href and I'm thinking this is clearing out the data in the service? Is there a way for me to change the URL to a new location and keep the data persisted in the service for the second controller? When I run the code below the alert in the second controller is always undefined.

app.js (Where Service is Defined)

var app = angular.module('SetTrackerApp', ['$strap.directives', 'ngCookies']);

app.config(function ($routeProvider) 
{
$routeProvider
  .when('/app', {templateUrl: 'partials/addset.html', controller:'SetController'})
  .when('/profile', {templateUrl: 'partials/profile.html', controller:'ProfileController'})
  .otherwise({templateUrl: '/partials/addset.html', controller:'SetController'});
});

app.factory('userService', function() {
var userData = [
    {yearSetCount: 0}
];

return {
    user:function() {
        return userData;
    },
    setEmail: function(email) {
        userData.email = email;
    },
    getEmail: function() {
        return userData.email;
    },
    setSetCount: function(setCount) {
        userData.yearSetCount = setCount;
    },
    getSetCount: function() {
        return userData.yearSetCount;
    }
};
});

logincontroller.js: (Controller 1 which sets value in service)

    app.controller('LoginController', function ($scope, $http, $window, userService) {

$scope.login = function() {
    $http({
        method : 'POST',
        url : '/login',
        data : $scope.user
    }).success(function (data) {
        userService.setEmail("foobar");
        $window.location.href = '/app'
    }).error(function(data) {
        $scope.login.error = true;
        $scope.error = data;
    });
}
});

appcontroller.js (Second controller trying to read value from service)

app.controller('AppController', function($scope, $http, userService) {

$scope.init = function() {      
    alert("In init userId: " userService.getEmail());
}

});

Answer 1

Define your service like this

app.service('userService', function() {
  this.userData = {yearSetCount: 0};

  this.user = function() {
        return this.userData;
  };

  this.setEmail = function(email) {
        this.userData.email = email;
  };

  this.getEmail = function() {
        return this.userData.email;
  };

  this.setSetCount = function(setCount) {
        this.userData.yearSetCount = setCount;
  };

  this.getSetCount = function() {
        return this.userData.yearSetCount;
  };
});

Check out Duncan's answer here:

AngularJS - what are the major differences in the different ways to declare a service in angular?