Implementing external services in AngularJS with RequireJS: a step-by-step guide

I'm currently integrating a controller from an external file, and I would like to achieve the same for a service from an external file as well. The service should be registered in the factory statement.

The injection of the controller is functioning properly

controllers

'use strict';

define(['angular', 'services'], function (angular) {
    return angular.module('vcApp.controllers', ['vcApp.services'])
        .controller('AuthCtrl', ['$scope', '$injector','AuthService', function($scope, $injector, AuthService) {
            require(['auth/authCtrl'], function(authCtrl) {
                $injector.invoke(authCtrl, this, {'$scope': $scope, 'AuthService':AuthService});
            });
        }]);
});

authCtrl

define([], function() {
    return ['$scope', '$routeParams', '$location', '$http', 'AuthService', function($scope, $routeParams, $location, $http, authService) {

        $scope.signIn = function() {
        ...
        }

        $scope.$apply();
    }];
});

Now, my goal is to inject the service

services

'use strict';

define(['angular'], function (angular) {
    angular.module('vcApp.services', [])
    .factory('AuthService', ['$http', '$injector', function($http, $injector) {
        require(['auth/authService'], function(authService) {
            $injector.invoke(authService, this, {'$http': $http});
        });
    }]);
});

authService

define([], function() {
    return ['$http', function ($http) {
        return {
            login: login
        };

        function login(username, password) {
            var request = $http(...);
            return(request);
        }
    }]
});

When authController calls authService.login(...), it throws an error stating

Error: [$injector:undef] Provider 'AuthService' must return a value from $get factory method.
.

This particular code was influenced by the project at angular-requirejs-seed.

Answer №1

When working with Angular, the factory() function should be used to return the service object. One approach to achieve this is shown below:

define(['angular'], function (abc) {
    abc.module('exampleApp.services', [])
    .factory('UserService', ['$http', '$injector', function($http, $injector) {
        var placeholder = {};
        
        require(['user/userService'], function(userService) {
            abc.extend(placeholder, $injector.invoke(userService, this, {'$http': $http}));
        });
        
        return placeholder;
    }]);
});

In this code snippet, a placeholder is defined for the service and then extended when it is lazily loaded.

(It's worth noting that the last 2 arguments of $injector.invoke() may not be necessary in this context.)

If you are interested in exploring another method of integrating RequireJS and Angular, specifically one that aligns well with lazy loading and the r.js optimizer, check out angular-require-lazy.

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