Optimal approach for applying dependency injection in an AngularJS service using TypeScript

When it comes to AngularJS services in TypeScript, I find that dependency injection can be quite cumbersome. Currently, I am defining a factory method within my service class and having to repeat all dependency injection arguments three times:

class MyService {
    public static Factory($rootScope, myController) {       // 1st time
        return new MyService($rootScope, myController);     // 2nd time
    }
    constructor(public $rootScope, public myController) {}  // 3rd time
}
myModule.factory('myService', MyService.Factory);

I have attempted the following approach, but it does not seem to work as expected:

class MyService {
    constructor(public $rootScope, public myController) {}  // only once
}
myModule.factory('myService', MyService);

While this simplified way works well for controllers, it seems to fall short for services. Is there a more effective way to handle this?

Your input is greatly appreciated!

Answer №1

It is recommended to utilize the service injection over factory:

class MyCustomService {
    constructor(public $rootScope) {}  // initialized only once
}
myApp.service('myCustomService', MyCustomService);

Answer №2

Instead of utilizing a factory method, consider using Angular's injector to create your controller.

Below is an example in TypeScript:

/// <reference path='d.ts/DefinitelyTyped/angularjs/angular.d.ts' />

class MyCtrl {
  public phrase: string;
  constructor($window) {
    this.phrase = 'I was loaded using the injector';
  }

  speak() {
    alert(this.phrase);
  }
}

function main() {
  var injector = angular.injector(['ng']);
  var ctrl = injector.instantiate(MyCtrl);
  ctrl.speak();
}

Check out this fiddler link to see it in action: http://jsfiddle.net/UPv5j/3/

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