Utilize dependency injection to connect services with controllers located in separate files

In my storage.js file, I have defined a controller and service as follows:

angular.module('app', []).

    controller('storageController', ['$scope', 'storage', function ($scope, storage) {
                                    $scope.loadProducts = function() {
                                        storage.loadProducts();
                                    };
                                    $scope.saveProducts = function(json) {
                                        storage.saveProducts(json);
                                    };
                                }])
    .service('storage', [function() {
                        this.loadProducts = function loadProducts() {
                            plugincoredata.loadProducts(function(success) {
                                    alert('SUCCESS: ' + success);
                                },
                                function(error) {
                                    alert('ERROR: ' + error);
                                }
                            );

                        };
                        this.saveProducts = function saveProducts(json) {
                            bancacoredata.saveProducts(function(success) {
                                    alert('SUCCESS: ' + success);
                                },
                                function(error) {
                                    alert('ERROR: ' + error);
                                },
                                json
                            );
                        };
                       }]);

Next, in my attempt to create a utils service in a separate file named utils.js:

    angular.module('app', [])
    .service('utils', [function() {
                       var amICordova = null;
                       this.isCordova = function isCordova() {
                            if (amICordova == null) {
                                amICordova = lastIndexOf('http://', 0) !== 0 && lastIndexOf('https://', 0) !== 0;
                            }
                            return amICordova;
                       };
    }]);

I want to inject the utils service into the controller so that I can determine if the application is running as a cordova app or in a normal web browser before saving data using native SQLite or IndexedDB. However, when I tried injecting it using

controller('storageController', ['$scope', 'storage', 'utils', function ($scope, storage, 'utils')
, I encountered an error

Error: [$injector:unpr] http://errors.angularjs.org/1.2.28/$injector/unpr?p0=utilsProvider%20%3C-%20utils

How can I successfully inject the utils service into the controller?

Answer №1

Within your utilities.js script, make sure to define the module as something other than what it currently is (perhaps "commons").

angular.module('commons', [])
.service('utils', [function() {
   ...
}]);

Then, in your storage.js file, ensure that you are loading the newly defined commons module.

angular.module('app', ['commons'])
.controller('storageController', ['$scope', 'storage', 'utils', function ($scope, storage, utils){
...
}]);

Answer №2

If you prefer not to use a common module, you can set up your service in this manner:

var myApp = angular.module('myApp',[]);//creating module

myApp.service('utilities', [function() {
      /*add your code here*/
}]);

By following this structure, you can avoid accidentally duplicating the module. Then, in your controller, you can inject the service like so:

myApp.controller('storageController', ['$scope', 'storage', 'utilities', function ($scope, storage, utilities) { 
    /*controller logic goes here*/
}]);

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