如何设置超时以中止工厂或服务内的 $http.get() ？

Question

我在我的工厂中有以下方法 getData(url)，它使用 $http.get(url) 从 URL

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 and/or 拒绝承诺，这样我就可以显示来自我的 控制器 的错误消息，它有这个方法：

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 属性来满足您的需求。看看 documentation，尤其是关于 config 对象的部分：

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承诺。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);
}

如果超时时间为 3 秒，则为：

服务：

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

控制器：

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

另请注意，您在成功和错误的情况下都调用了 hideLoading。您可以在链式 finally 处理程序中调用一次：

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

如何设置超时以中止工厂或服务内的 $http.get() ？

How to set a timeout to abort an $http.get() inside a factory or service?

angularjs

angularjs-service

angularjs-factory

ionic-framework

ionic