angularjs - 如何设置超时以中止工厂或服务中的 $http.get()？

Question

我有以下方法getData(url)在我的工厂 使用 $http.get(url)从 URL 获取数据

angular
  .module('az-app')
  .factory('WebServiceFactory', function ($http, $q) {

   var WebServiceFactory = this;


   WebServiceFactory.getData = function (url) {

      var deferred = $q.defer();

      $http.get(url)
        .then(
        function (response) {

          deferred.resolve({
            data: response
          });

        }, function (rejected) {

          deferred.reject({
            data: rejected
          });
        }
      );
      //Promise to be returned
      return deferred.promise;
    }

它工作正常，但我需要中止 http.get 和/或拒绝 promise ，以便我可以显示来自我的 的错误消息 Controller 有这个方法:

var getSpecialties = function (type) {
  doctorsCtrl.showLoading();

  var url = "example.com";

  WebServiceFactory.getData(url)
    .then(
    function (result) {
      doctorsCtrl.hideLoading();


      var specialtiesArray = result.data.data;

      StorageFactory.specialties = specialtiesArray;
      doctorsCtrl.specialties = StorageFactory.specialties

      //I WANT TO TRIGGER THIS REJECTED FUNCTION when timeout time is finished
    }, function (rejected) {
      doctorsCtrl.hideLoading();
      doctorsCtrl.showAlert();
    }
  );
}

Answer 1

服务$http在配置对象中接受 timeout可以满足您的需求的属性。看看documentation ，尤其是关于 config 的部分目的:

timeout – {number|Promise} – timeout in milliseconds, or promise that should abort the request when resolved.

另外，请注意您正在以低效的方式使用 Promise。以下是 promise 反模式 :

WebServiceFactory.getData = function (url) {

 var deferred = $q.defer();

 $http.get(url)
   .then(
   function (response) {

     deferred.resolve(...);

   }, function (rejected) {

     deferred.reject(...);
   }
 );
 //Promise to be returned
 return deferred.promise;
}

你可以简单地:

WebServiceFactory.getData = function (url) {
    return $http.get(url);
}

超时时间为 3 秒，它将是:

服务:

WebServiceFactory.getData = function (url) {
    return $http.get(url, {timeout: 3000});  // <-- timeout applies ONLY for this call
}

Controller :

WebServiceFactory.getData(url).then(
    function (result) {
      doctorsCtrl.hideLoading();
      doctorsCtrl.specialties = StorageFactory.specialties = result.data;
    }, function (rejected) {
      doctorsCtrl.hideLoading();
      doctorsCtrl.showAlert();
    }
  );

另请注意，您调用的是 hideLoading在成功和错误的情况下。您可以在链式 finally 处理程序中调用它一次:

// ...
.finally(function () {
    doctorsCtrl.hideLoading();
}