Angular factory functions that include .success and .error methods

I am new to using Angular and I'm curious about the recommended best practices for placing the .success and .error functions. Should they be within the controller or within the factory? Here are two examples:

Option 1:

(function(){
    'use strict';

    angular
    .factory('apiService', function($http){
        var apiService = {
            getProfileData: getProfileData
        }

        return apiService;

        function getProfileData(url){
            return $http.jsonp(url);
        }

    });
})();

Option 2:

(function(){
    'use strict';

    angular
    .factory('apiService', function($http){
        var apiService = {
            getProfileData: getProfileData
        }

        return apiService;

        function getProfileData(url){
            return $http.jsonp(url)
                .success(function(data){
                    return data;
                })
                .error(function(err){
                    return err;
                });
        }

    });
})();

How should handling this in a controller differ from these options?

Answer №1

It is highly recommended that you opt for the second option you posted and manage it within the service. Services are designed to be reusable, so if error handling is not implemented there, it will need to be implemented in each individual controller that utilizes it.

UPDATE: The only exception to this guideline would be if error and success handling varied significantly depending on the specific controller consuming the service, but personally, I have yet to encounter a scenario where this applies.

Answer №2

My recommendation would be to keep it within the service or factory. There's no need for the controller to be aware of the communication implementation, especially if you may want to mock it later on.

It's all about separating concerns. :)

Answer №3

There are two valid approaches, depending on how you want to expose the API.

The first approach:

This approach is straightforward. It is best suited for situations where you want complete control over aspects such as data, headers, status, and configuration in the $http response.

The second approach:

With this approach, you can create an abstraction layer between your callee method and service. The method will only receive the data from the service, while other parts of the response remain hidden. Additionally, you can perform data manipulation operations, validation checks, and resolve or reject promises based on certain conditions.

I recommend opting for the second approach as it allows for more flexibility and control over the data before it is returned to the callee method.

Answer №4

If you want a simpler syntax, go with the 2nd option which utilizes .success and returns a promise. However, if you prefer full control and power over the promise API, I recommend using .then despite it being slightly more verbose.

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