Exploring modern ES6 (AngularJS) features for enhanced services

I am encountering difficulties when trying to access Angular's built-in services like $http while creating a service with ES6.

For instance, I am developing a "ResultsFinder" service that will make an AJAX call and then perform some operations. The issue arises when I realize that I can only utilize $http within the constructor (if passed as an argument), but not in other methods such as getResults.

Take a look at this code snippet:

(() => {
  'use strict';

  class ResultsFinder {
    constructor($http) {}
    getResults() {
      return 'ResultsFinder';
    }
  }

  /**
   * @ngdoc service
   * @name itemManager.service:ResultsFinder
   *
   * @description
   *
   */
  angular
    .module('itemManager')
    .service('ResultsFinder', ResultsFinder);
}());

In the getResults method, the $http is inaccessible. To gain access, I would need to resort to something that does not feel right like the following:

(() => {
  'use strict';

  class ResultsFinder {
    constructor($http) {
      this.$http = $http;
    }
    getResults() {
      // Here I have access to this.$http
      return 'ResultsFinder';
    }
  }

  /**
   * @ngdoc service
   * @name itemManager.service:ResultsFinder
   *
   * @description
   *
   */
  angular
    .module('itemManager')
    .service('ResultsFinder', ResultsFinder);
}());

Can anyone provide me with advice on the correct approach to address this issue?

Answer №1

To utilize the this.$http in your getResults method.

(() => {
  'use strict';
      
class ResultsFinder {

    static $inject = ['$http'];   
    constructor($http) {
        this.$http = $http;
    }

    getResults() {
        return this.$http.get('/foo/bar/');
    }
}

  /**
   * @ngdoc service
   * @name itemManager.service:ResultsFinder
   *
   * @description
   *
   */
  angular
    .module('itemManager')
    .service('ResultsFinder', ResultsFinder);
}());

Additionally, I have included a static $inject for your class, which is considered a best practice unless utilizing ngAnnotate. This makes it simpler to switch out implementations by adjusting the $inject values.

If you come from an ES5 background, consider how this would be written in ES5:

ResultsFinder.$inject = ['$http'];
var ResultsFinder = function($http) {
    this.$http = $http;
}

ResultsFinder.prototype.getResults = function() {
    return this.$http.get('/foo/bar/');
}

NOTE

Given that ES6 is being utilized, it is advisable to employ ES6 modules for code organization.

Create and export your Angular module within an ES6 module:

import { module } from 'angular';

export var itemManager = module('itemManager', []);

Then import the Angular module

import { itemManager } from '../itemManager';

class ResultsFinder {

    static $inject = ['$http'];   
    constructor($http) {
        this.$http = $http;
    }

    getResults() {
        return this.$http.get('/foo/bar/');
    }
}

itemManager.service('ResultFinder', ResultFinder);

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