在服务中处理 $http 响应 [英] Processing $http response in service

问题描述

我最近在这里发布了我面临的问题的详细描述在 SO.由于我无法发送实际的 $http 请求，我使用超时来模拟异步行为.在@Gloopy 的帮助下，从我的模型到视图的数据绑定工作正常

I recently posted a detailed description of the issue I am facing here at SO. As I couldn't send an actual $http request, I used timeout to simulate asynchronous behavior. Data binding from my model to view is working correct, with the help of @Gloopy

现在，当我使用 $http 而不是 $timeout(在本地测试)时，我可以看到异步请求成功并且 data在我的服务中充满了 json 响应.但是，我的观点没有更新.

Now, when I use $http instead of $timeout (tested locally), I could see the asynchronous request was successful and data is filled with json response in my service. But, my view is not updating.

更新 Plunkr 此处

推荐答案

这里有一个 Plunk 可以满足您的需求:http://plnkr.co/edit/TTlbSv?p=preview

Here is a Plunk that does what you want: http://plnkr.co/edit/TTlbSv?p=preview

我们的想法是直接使用 Promise 及其then"函数来操作和访问异步返回的响应.

The idea is that you work with promises directly and their "then" functions to manipulate and access the asynchronously returned responses.

app.factory('myService', function($http) {
  var myService = {
    async: function() {
      // $http returns a promise, which has a then function, which also returns a promise
      var promise = $http.get('test.json').then(function (response) {
        // The then function here is an opportunity to modify the response
        console.log(response);
        // The return value gets picked up by the then in the controller.
        return response.data;
      });
      // Return the promise to the controller
      return promise;
    }
  };
  return myService;
});

app.controller('MainCtrl', function( myService,$scope) {
  // Call the async method and then do stuff with what is returned inside our own then function
  myService.async().then(function(d) {
    $scope.data = d;
  });
});

这里有一个稍微复杂一点的版本，它缓存请求，所以你只在第一次创建它(http://plnkr.co/edit/2yH1F4IMZlMS8QsV9rHv?p=preview):

Here is a slightly more complicated version that caches the request so you only make it first time (http://plnkr.co/edit/2yH1F4IMZlMS8QsV9rHv?p=preview):

app.factory('myService', function($http) {
  var promise;
  var myService = {
    async: function() {
      if ( !promise ) {
        // $http returns a promise, which has a then function, which also returns a promise
        promise = $http.get('test.json').then(function (response) {
          // The then function here is an opportunity to modify the response
          console.log(response);
          // The return value gets picked up by the then in the controller.
          return response.data;
        });
      }
      // Return the promise to the controller
      return promise;
    }
  };
  return myService;
});

app.controller('MainCtrl', function( myService,$scope) {
  $scope.clearData = function() {
    $scope.data = {};
  };
  $scope.getData = function() {
    // Call the async method and then do stuff with what is returned inside our own then function
    myService.async().then(function(d) {
      $scope.data = d;
    });
  };
});

这篇关于在服务中处理 $http 响应的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！