Troubleshooting the issue with an undefined factory in angularjs ui-router

I have been following the examples provided on the UI-Router wiki as well as the sample available at this link: https://scotch.io/tutorials/angular-routing-using-ui-router However, I am facing an issue where the resolved factory is appearing undefined when injected into the controller. Any assistance on resolving this would be highly appreciated.

app var app = angular.module('toa', ['ngResource', 'ui.bootstrap', 'ui.router']);

app.config(function($stateProvider, $urlRouterProvider){
    $urlRouterProvider.otherwise('/');
    $stateProvider.state('home', {
        url: '/',
        views: {
            '' : {
              templateUrl: 'app/partials/home-partial.html'  
            },
            'sidebar@home': {
                templateUrl: 'loginMenu.html',
                controller: 'loginController'
            },
            'content@home': {
                templateUrl: 'app/views/home.html',
                controller: 'homeController'
            }
        }
    }).state('register', {
        url: '/register',
        views: {
            '': { templateUrl: 'app/partials/register-partial.html' },
            'content@register': {
                resolve: {
                    registerService: 'registerService'
                },
                templateUrl: 'app/views/registerView.html',
                controller: 'regController'
            }
        }
    });
});

controller

app.controller('regController', ['$scope', '$location', '$resource', '$http', function($scope, $route, $routeParams, $location, $resource, $http, registerService){
   // Controller code is here console.log(registerService) prints undefined
}

service

app.factory('registerService', ['$http', function($http){
    return {
        registerPlayer : function(playerName, playerPassword, playerEmail, playerGender) {
            var newPlayer = {
                ...
            };
            $http.post('...', newPlayer).
                success(function(data, status, headers, config) {
                    console.log(data);
                    console.log(status);
                }).
                error(function(data, status, headers, config) {
                    console.log(data);
                    console.log(status);
                });
        },
        checkEmail : function(emailIn) {
            var data = { email : emailIn };
            return $http.post('...', data).
                then(function(data) {
                    return data;
                });
        },
        checkUsername : function(usernameIn) {
            var data = { username : usernameIn };
            return $http.post('...', data).
                then(function(data) {
                    return data;
                });
        }
    };
}]);

Answer №1

Don't forget to include registerService in the array notation of the controller definition after $http.

When using resolve block in route configuration to inject something, make sure to provide a function that returns either a Promise or a value. Try this:

resolve: {
    registerService: function(registerService) {
        return registerService;
    }
},

Alternatively, you can directly inject the service into the controller without requiring a resolve block in your case:

app.controller('regController', ['$scope', '$location', '$resource', '$http', 'registerService', function($scope, $route, $routeParams, $location, $resource, $http, registerService) {
   // Controller code goes here; console.log(registerService) will print undefined
}

Answer №2

It is important to note that when using resolve, it should consist of functions within a dictionary, rather than strings.

To rectify the issue, modify

registerService: 'registerService'
as follows:

registerService: function (){
      //Your resolve function can be placed here
}

Answer №3

It seems unnecessary to resolve a service that is already injectable. It appears that there might be confusion between the name of the service declared at the module level and the resolved dependency, causing Angular to become confused.

Using resolve could be beneficial if you need to execute actions like registering a user or checking an email before entering your controller.

I recommend removing the resolve section and ensuring that the 'registerService' string is included before your function declaration.

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