AngularJS:工厂$ http服务

Question

我试图了解Angular中工厂和服务的概念.我在控制器下面有以下代码

init();

    function init(){
        $http.post('/services', { 
            type : 'getSource',
            ID    : 'TP001'
        }).
        success(function(data, status) {
            updateData(data);
        }).
        error(function(data, status) {

        });

        console.log(contentVariable);
    };
    function updateData(data){
        console.log(data);
    };

这段代码工作正常.但是当我将$ http服务转移到工厂时,我无法将数据返回给控制器.

studentApp.factory('studentSessionFactory', function($http){
    var factory = {};
    factory.getSessions = function(){
        $http.post('/services', { 
            type : 'getSource',
            ID    : 'TP001'
        }).
        success(function(data, status) {
            return data;
        }).
        error(function(data, status) {

        });
    };
    return factory;
});

studentApp.controller('studentMenu',function($scope, studentSessionFactory){
    $scope.variableName = [];
    init();
    function init(){
        $scope.variableName = studentSessionFactory.getSessions();
        console.log($scope.variableName);
    };
});

使用工厂是否有任何优势,因为$ http甚至可以在控制器下工作

Answer 1

将studentSessions服务移出控制器的目的是实现关注点分离.您的服务工作是了解如何与服务器通信,控制器的工作是在视图数据和服务器数据之间进行转换.

但是你混淆了你的异步处理程序以及返回什么.当稍后收到数据时,控制器仍然需要告诉服务该做什么...

studentApp.factory('studentSession', function($http){
    return {
        getSessions: function() {
            return $http.post('/services', { 
                type : 'getSource',
                ID    : 'TP001'
            });
        }
    };
});

studentApp.controller('studentMenu',function($scope, studentSession){
    $scope.variableName = [];

    var handleSuccess = function(data, status) {
        $scope.variableName = data;
        console.log($scope.variableName);
    };

    studentSession.getSessions().success(handleSuccess);
});

Answer 2

第一个答案很棒,但也许你可以理解这个:

studentApp.factory('studentSessionFactory', function($http){
    var factory = {};

    factory.getSessions = function(){
        return $http.post('/services', {type :'getSource',ID :'TP001'});
    };

    return factory;
});

然后:

studentApp.controller('studentMenu',function($scope, studentSessionFactory){
      $scope.variableName = [];

      init();

      function init(){
          studentSessionFactory.getSessions().success(function(data, status){
              $scope.variableName = data;
          });
          console.log($scope.variableName);
     };
 });