Is it advisable to use Angular $resource JSON Callback if it's not functioning correctly?

I am in the process of creating a resource to send data to my controller for an existing API that I need to connect with. Unfortunately, I do not have the ability to make any changes on the backend.

Current state of my Resource factory:

'use strict';

        angular.module('XXX')
        .factory('elements', function (
            $resource
        ) {
            return $resource('http://XXX/api/v1/elements/:id',
                {
                    callback: 'JSON_CALLBACK',
                    id: '@id'
                },
                {
                    query: {
                        method: 'JSONP',
                        params: {
                            id: '@id'
                        }
                    },
                    all: {
                        method: 'JSONP',
                        params: {}
                    }
                }
            );
        });

The elements.query() functions as expected, but unfortunately the elements.all() is not working. Upon inspecting the returned content in the network tab, I noticed that it starts with angular.callbacks._2([{... DATA...}]), which does not seem correct to me.

UPDATE.....

After some modifications, I managed to get it to work with this:

    angular.module('XXX')
    .factory('element', function (
        $resource
    ) {
        return $resource('http://XXX/api/v1/elements/:id',
            {
                id: '@id',
                        callback : 'JSON_CALLBACK',
            },
            {
                query: {
                    method: 'JSONP',
                    params: {
                        id: '@id'
                    }
                },
                all: {
                    method: 'JSONP',
                    isArray: true,
                    params: {
                        callback : 'JSON_CALLBACK',
                    }
                }
            }
        );
    });

However, the JSON it returns comes in as an array. While I can parse it for usage, I am now questioning if this is the best practice?

Answer №1

When using the isArray flag in Angular, it is essential for creating an empty Object, such as an Array, before the request is sent. This ensures that all bindings will function correctly by maintaining the same reference throughout the process. Once the result is received, it will be populated into the designated variable.

A common approach to service calls follows this pattern:

.factory('Person', function($resource, AppConfig) {
   var Person = $resource(AppConfig.remoteURL + '/person/:id', {}, {
      query: {method:'GET'},
      queryAll: {method:'GET', isArray: true},
      create: {method:'POST'},
      update: {method: 'PUT'}});

   return Person;
});

To make a call, you can use the following method:

Person.queryAll(function (result) {
   angular.isArray(result); // should return true
}, function (error) 
{
    //handle error
}

Answer №2

When dealing with data in array form, it may be necessary to create a custom transformResponse function to retrieve the desired information.

In the $resource documentation, there is a reference to the transformResponse property:

transformResponse – {function(data, headersGetter)|Array.<function(data, headersGetter)>}
– This property allows you to specify a single transform function or an array of functions that will manipulate the http response body and headers.

To implement this in your code, you would need to do something similar to the following example:

all: {
  method: 'JSONP',
  isArray: true,
  params: {
    callback : 'JSON_CALLBACK',
  },
  transformResponse: function(data, headersGetter) {
     return data.[....].DATA;
  }
}

Answer №3

Typically, $resource is employed for interacting with RESTful APIs, whereas JSONP solely relies on the GET method.

Thus, in this scenario, I recommend utilizing $http.JSONP rather than $resource.

Furthermore, it would be beneficial if your server-side can extend support to CORS in your code.

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