What is the problem with the dependencies in this factory?

Question

What is the problem with the dependencies in this factory?

I am currently utilizing AngularJS and I am looking to retrieve a controller using one factory that is dependent on another.

This can be illustrated as follows:

MyCtrl -> Factory1 -> Factory2

I attempted to achieve this in three separate files (loaded in the following order):

Factory2.js

app.factory('Factory2', function () { ... })

Factory1.js

app.factory('Factory1',['Factory2', function (Factory2) { ... })

controller.js

app.controller('MyCtrl',['$scope', 'Factory1', function ($scope, Factory1) { ... })

Within my HTML code, I have included:

<script src="services/factory2.js" type="text/javascript"></script>  
<script src="services/factory1.js" type="text/javascript"></script>
<script src="controllers/controller.js" type="text/javascript"></script>

Despite these efforts, I encountered an error:

Unknown provider: Factory2Provider <- Factory2 <- Factory1

What could be causing this issue? Am I overlooking something in my code?

javascript angularjs dependency-injection factory

Answer 1

Answer №1

Optimizing your code by utilizing modules can eliminate the need for $inject

var app = angular.module('app', ['factories', 'mymodule']);

angular.module('factories', [])
    .factory('Factory2', function () { })
    .factory('Factory1', ['Factory2', function (Factory2) {
         return myCustomFunction = function () {
             alert('todo');
         }
    }]);

angular.module('mymodule', [])
    .controller('MyCtrl', ['$scope', 'Factory1', function ($scope, Factory1) {
    $scope.text = "testing";
}])

http://jsfiddle.net/kL78rdr3/3/

Answer 2

Optimizing your code by utilizing modules can eliminate the need for $inject

var app = angular.module('app', ['factories', 'mymodule']);

angular.module('factories', [])
    .factory('Factory2', function () { })
    .factory('Factory1', ['Factory2', function (Factory2) {
         return myCustomFunction = function () {
             alert('todo');
         }
    }]);

angular.module('mymodule', [])
    .controller('MyCtrl', ['$scope', 'Factory1', function ($scope, Factory1) {
    $scope.text = "testing";
}])

http://jsfiddle.net/kL78rdr3/3/

Answer 3

Answer №2

Have you considered utilizing explicit injection using $inject? This method provides a higher level of control over the dependencies in your code. Here is an example to illustrate this:

profileController.js

function profileController (service, params, dataProvider) {
    //implementation
}
profileController.$inject = ['$scope', '$routeParams', 'dataProvider'];
app.controller("profileController", profileController);

dataProvider.js

var dataProvider = function (http, logger) {
    //implementation
}
dataProvider.$inject = ["$http", "$log"];
app.factory("dataProvider", dataProvider);

Check out this resource for more insight: Explicit Dependency Injection

Answer 4

Have you considered utilizing explicit injection using $inject? This method provides a higher level of control over the dependencies in your code. Here is an example to illustrate this:

profileController.js

function profileController (service, params, dataProvider) {
    //implementation
}
profileController.$inject = ['$scope', '$routeParams', 'dataProvider'];
app.controller("profileController", profileController);

dataProvider.js

var dataProvider = function (http, logger) {
    //implementation
}
dataProvider.$inject = ["$http", "$log"];
app.factory("dataProvider", dataProvider);

Check out this resource for more insight: Explicit Dependency Injection

What is the problem with the dependencies in this factory?

Answer №1

Answer №2

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