Question

我必须进行两次$ http调用，但第二次调用必须基于第一次响应（仅当出现任何错误时）。

Answer 1

最好的选择是在您的请求中使用.then（）。当使用.then时，你可以传入多个将被调用的函数 - 第一个如果成功，第二个如果有错误。所以，它看起来像这样：

//First http call
$http.get('http://your-url.com')
  .then(function (trsponse) {
    //Call was successful; do something
  }, function (response) {
    //Call was unsuccessful; Grab whatever you need from the response and make your second http call:
    var data = response.data;
    var statusCode = response.status;
    var statusText = response.statusText;
    $http.get('http://your-second-url.com');  
  });

传递给你的函数的响应将包含这些属性：

 data – The response body
 status – The status code of the response (e.g. 404)
 headers – Headers on the response
 statusText – The text of the status of the response

Answer 2

您可以这样做：

var promise1 = $http.get('firstUrl.com');

promise.then(
  function(payload) {
    $scope.movieContent = payload.data;
  })
  .catch(function (error) {
    secondUrl();
    console.log("Something went terribly wrong.");
  });

然后：

var secondUrl = function(){

   var promise2 = $http.get('secondUrl.com');

   promise2.then(
   // get the data and also other required functions
  );

}

如何在angularJS中依次调用$ http？但我需要根据第一个$ http的响应将其称为第二个$ http

2 个答案: