Return deferred.promise 返回 2 个服务

Question

我有 3 个服务。

HttpSender - 它控制 $http 请求

app.service("HttpSender", ["$http", "$q", function ($http, $q) {

    this.send = function (path, method, params) {
        var deferred = $q.defer();
        $http({
            url: path,
            method: method,
            params: params
        }).then(function successCallback(response) {
            deferred.resolve(response.data);
        }, function errorCallback(response) {
            deferred.reject(response);
        });
        return deferred.promise;
    };

    this.sendRequestWithFile = function (path, method, params) {
        //todo check if needed
    };

}]);

Api - 控制所有 api/ 访问令牌进程

  service("API", ["HttpSender", "$q", 'WindowOpen', function(HttpSender, $q, WindowOpen){

var self = this;
 var API = {};

    API.requestTypes = {
        GetMethod: "GET",
        PostMethod: "POST",
        DeleteMethod: "DELETE",
        PutMethod: "PUT"
    };

        API.sendRequest = function (path, method, parameters, isCheckAccessToken)
        {
            path = ServersConfig.getApiServerUrl() + path;
            parameters.access_token = getAccessToken();
            HttpSender.send(path, method, parameters);
        };


        return API;

    }]);

Api - 激活 api 请求的端点

  app.factory('SelectedEndpoint', ['API', 

               function (API) {

                var getPath = function (campaign) {
                    return "/campaigns/" + campaign.id + '/content/selected';
                };

                return {
                    get: function (campaign) {
                        API.sendRequest(getPath(campaign),  API.requestTypes.GetMethod, {}, true).then(function (content) {


                        });
                    }
                };


          }]);

如何 return deferred.promise 到端点函数，然后才能得到答案？以下过程仅在我添加 then also in the api factory then return it to the endpoint

时才有效

Answer 1

How can return the deferred.promise to the endpoint function so the then will get the answer?

通过正确地return在每一步做出承诺。

1. HttpSender 服务。这里不用deferred，直接return promise:

app.service("HttpSender", ["$http", "$q", function($http, $q) {

  this.send = function(path, method, params) {
    return $http({
      url: path,
      method: method,
      params: params
    }).then(function successCallback(response) {
      return response.data;
    });
  };

}]);

2. Api 服务。确保你 return 之前承诺 return HttpSender.send(path, method, parameters);:

 service("API", ["HttpSender", "$q", 'WindowOpen', function(HttpSender, $q, WindowOpen) {

  var self = this;
  var API = {};

  API.requestTypes = {
    GetMethod: "GET",
    PostMethod: "POST",
    DeleteMethod: "DELETE",
    PutMethod: "PUT"
  };

  API.sendRequest = function(path, method, parameters, isCheckAccessToken) {
    path = ServersConfig.getApiServerUrl() + path;
    parameters.access_token = getAccessToken();
    return HttpSender.send(path, method, parameters); // note return promise
  };

  return API;

}]);

Return deferred.promise 返回 2 个服务

Return deferred.promise 2 services back

factory

deferred

angularjs