Instantiating objects directly from factories in AngularJS

How can I make a direct call to RESTService.get without using AngularJS’ dependency injection in the code snippet below?

angular.module('RESTModule', ['ngResource']).
  factory('RESTService', ['$resource', function($resource) {
      return $resource('http://jsonplaceholder.typicode.com/posts/1', {});
    }
  ]);

I tried creating a library method as shown below, but it doesn't work as expected. Is there a way to achieve this functionality without relying on factory()?

var MyLibrary = {};
MyLibrary.method = function() {
  // ...
  // The line below fails to execute successfully
  angular.module('RESTModule').factory('RESTService').get();
};

Perhaps I am approaching this in the wrong way and should consider writing an AngularJS service instead. Any guidance or suggestions would be greatly appreciated.

Thank you!

Side note: I am currently developing an application that allows developers to include their own forms (views) and modules. Instead of requiring them to inject modules like RESTModule, I would prefer they can simply call a predefined "static" library method like MyLibrary.method.

Answer №1

const service = angular.element(document.querySelector('*[ng-app]')).injector().get('RESTService');

To ensure that this code works properly, you need to confirm that Angular has been loaded and dependency injection is complete as shown below:


let restService;
const timer = setTimeout(() => { 
    if(angular && 
        angular.element(document.querySelector('*[ng-app]')).injector())
    {
        clearTimeout(timer);
        restService = angular.element(document.querySelector('*[ng-app]')).injector().get('RESTService');
    }
}, 1000);

Answer №2

One important point to note is that your approach requires the utilization of $resource in order to function correctly. When utilizing Angular, this dependency will be automatically injected for you, ensuring that $resource is not left undefined.

If you wish to directly call this method, you can assign it to a variable and then invoke it with your own $resource object.

var factoryMethod=function($resource) {
      return $resource('http://jsonplaceholder.typicode.com/posts/1', {});
    };
angular.module('RESTModule', ['ngResource']).
  factory('RESTService', ['$resource', factoryMethod]);
// To make use of factoryMethod(<your object>);

Although there was limited information provided regarding dynamic user-supplied forms, the method can still be invoked as per usual.

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