Effective ways to incorporate functions from different modules in AngularJS

Currently, I am enhancing my AngularJS skills by creating a Todo list application. Unfortunately, I am encountering some challenges when it comes to utilizing modules from one another.

To elaborate, in my app.js file, I have the following code snippet:

var app = angular.module('todoApp', [
    'ngCookies',
    'ngResource',
    'ngSanitize',
    'ui.router',
    'TodoItem'
    ]);

var TodoItem = angular.module('TodoItem');
app.init = function () {
    var item1 = TodoItem.newItem();
    item1.title = 'Item 1';
    var item2 = TodoItem.newItem();
    item2.title = 'Item 2';

    app.todoList = [item1, item2];
}

app.init();

The 'TodoItem' module is located in a file called TodoItem.js, containing the following code:

'use strict';

var TodoItemModule = angular.module('TodoItem', []);

function TodoItemClass() {
    this.id = -1;
    this.title = '';
    this.detail = '';
    this.endDate = null;
    this.startDate = null;
}

TodoItemModule.newItem = function() {
    return new TodoItemClass();
}

Furthermore, in the index.html of my application, I have included the following scripts:

<script src="scripts/app.js"></script>
<script src="scripts/controllers/main.js"></script>
<script src="scripts/controllers/todo.js"></script>
<script src="scripts/models/TodoItem.js"></script>

It seems like there are no spelling errors in the script references. However, upon inspecting the Chrome Javascript console, I encounter the following error:

Uncaught Error: [$injector:nomod] Module 'TodoItem' is not available! You either misspelled the module name or forgot to load it. If registering a module ensure that you specify the dependencies as the second argument.
http://errors.angularjs.org/1.2.6/$injector/nomod?p0=TodoItem 

Can you please guide me on where I might have gone wrong here? Your assistance is greatly appreciated. Thank you.

Answer №1

Ensure that TodoItem.js is loaded before app.js in order for it to be required.

While you have created the TodoItem module, remember to register any services within it that you want to use. Refer to http://docs.angularjs.org/guide/module/#configuration-blocks and http://docs.angularjs.org/guide/dev_guide.services.creating_services.

By specifying TodoItem as a dependency of todoApp, all the services registered in TodoItem will be accessible in any services, controllers, or filters that you register in todoApp.

Answer №2

Before diving into scripts/app.js, ensure that scripts/models/TodoItem.js is loaded first.

Your current method strays slightly from angular's established architecture. I suggest utilizing Angular's pre-existing services instead of creating a new class like TodoItemClass. Check out the documentation on creating services here.

Answer №3

Using AngularJS in a way that mimics RequireJS is not the correct approach. Simply including other modules in your app does not automatically integrate their class objects into your code. Instead, it allows the services/controllers/directives, etc. defined in those modules to be injected into your own services/controllers.

The code samples provided do not actually demonstrate any interaction with Angular. If you are seeking a modularized AMD-style dependency manager, consider using RequireJS. However, if you are developing controllers/directives/services/factories for a single-page application, it is important to build those components within your Angular modules.

Answer №4

While the previous responses covered the theoretical issues with your existing code and the usage of AngularJS, I wanted to provide a practical code snippet to illustrate their points.

Task.js

(function() {
'use strict';

var taskModule = angular.module('Task', []);

taskModule.service('taskService', [function() {
  var service = {};

  function TaskClass() {
    this.id = -1;
    this.title = '';
    this.description = '';
    this.dueDate = null;
    this.startDate = null;
  }

  service.newTask = function() {
    return new TaskClass();
  }

  return service;

}]);

})();

application.js

(function() {
'use strict';

var app = angular.module('taskApp', [
    'ngCookies',
    'ngResource',
    'ngSanitize',
    'ui.router',
    'Task'
    ]);

app.controller('MainCtrl', ['$scope','taskService', function($scope,taskService) {
  var task1 = taskService.newTask();
  task1.title = 'Task 1';
  var task2 = taskService.newTask();
  task2.title = 'Task 2';

  $scope.taskList = [task1, task2];
}]);

})();

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