$injector encountered a problem resolving the required dependency

Currently, I am attempting to adopt the LIFT protocol (Locate, Identify, Flat, Try(Dry)) for organizing my Angular projects. However, I am encountering difficulties in handling dependencies from other files.

Here is the factory I have:

(function () {

    'use strict';

    angular
        .module('CBPWidget', [])
        .factory('apiManufacturers', apiManufacturers);

    function apiManufacturers () {

        function hello () {
            return 'hello';
        }

        return {
            hello: hello
        };

    }

})();

and this is the controller I've implemented:

(function () {

    'use strict';

    angular
        .module('CBPWidget', [])
        .controller('stepOneController', stepOneController);

    stepOneController.$inject = ['$scope', 'apiManufacturers'];

    function stepOneController ($scope, apiManufacturers) {

        $scope.step = 'step1';
        console.log(apiManufacturers.hello);

    }

})();

As a result, the following error message appears:

Error: [$injector:unpr] Unknown provider: apiManufacturersProvider <- apiManufacturers <- stepOneController

I have arranged my factory JS file above the controller JS file in my HTML (which will eventually be minimized).

If you have any suggestions or guidance on where I might be going astray, I would greatly appreciate it as this methodology is new to me.

Answer №1

When working with the CBPWidget module, be sure to avoid creating it multiple times. Use angular.module('CBPWidget',[]) to create the module and angular.module('CBPWidget') to access an existing module instance. To update the controller code, follow this example:

(function () {

    'use strict';

    angular
        .module('CBPWidget') // refer to the existing CBPWidget module
        .controller('stepOneController', stepOneController);

    stepOneController.$inject = ['$scope', 'apiManufacturers'];

    function stepOneController ($scope, apiManufacturers) {

        $scope.step = 'step1';
        console.log(apiManufacturers.hello);

    }

})();

Answer №2

Your angular.module('CBPWidget', []) section of code is wrongly redefining the angular app. This is causing the flushing of the apiManufacturers service associated with it, and then defining a controller within it. It is important to note that this practice should be avoided; instead, you should utilize an existing module that has already been defined.

Code

angular
        .module('CBPWidget') //avoid overriding the app here and use existing modules
        .controller('stepOneController', stepOneController);

Answer №3

According to the AngularJS documentation, it is highlighted that

.module('CBPWidget', [])

is distinguishable from

.module('CBPWidget')

The latter is essential for referencing a module, while the former is utilized for defining one. It is recommended to use the latter format in all circumstances except during the initial definition stage.

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