在工厂的GET请求之后，AngularJs $ scope不会更新 [英] AngularJs $scope doesn't update after a GET request on a factory

问题描述

我一直在尝试AngularJS进行实验项目，我遇到了这个问题。
在我的html中，我想显示一个项目列表

I have been trying AngularJS for a experimental project and I came along with this problem. In my html I want to display a list of items

Index.html

<h1>Some list</h1>
<div ng-controller="datlist">
    <div ng-repeat="item in items">
        <div>Item description: {{item.description}}</div>
        <div>Item name: {{item.name}}</div>
    </div>
</div>

起初我使用一个简单的控制器来获取信息并使用这个更新视图：

At first I was using a simple controller to get the information and update the view just using this:

controllers.js（原始）

function datlist($scope,$http){
$http({method: 'GET', url: 'http://localhost:61686/getdatlist?format=json', headers: {'Access-Control-Allow-Origin': 'localhost:*'}}).
    success(function(data, status, headers, config) {
        $scope.items=data.itemsToReturn;
        console.log(data);
}).
error(function(data, status, headers, config) {
    console.log("fail");
});

}

这个工作得很好我可以得到清单项目。同时，通过更改我的结构以使用工厂发出相同的请求并将其绑定到$ scope.items它不起作用。我尝试了很多$ watch的变种，但是我无法更新$ scope.items。我发现了一些关于$ apply的内容，但我真的无法理解如何使用它。

This was working pretty well and I could get the list of items. Whilst, by changing my structure to use a factory to make the same request and bind it to $scope.items it doesn't work. I tried a lot of variations of $watch but I couldn't get it to update $scope.items. I found something about $apply but I really can't understand how to use it.

controllers.js（新的）

var datModule = angular.module('datModule',[]);
datModule.controller('datlist', function ($scope, datfactory){
    $scope.items = datfactory.getlist();
    $scope.$watch($scope.items, $scope.items = datfactory.getlist());
});
datModule.factory('datfactory', function ($http){
    var factory = {};
    factory.getlist = function(){
        $http({method: 'GET', url: 'http://localhost:61686/getdatlist?format=json', headers: {'Access-Control-Allow-Origin': 'localhost:*'}}).
        success(function(data, status, headers, config) {
            console.log(data.itemsToReturn); //I get the correct items, all seems ok here
            return data.itemsToReturn;
        }).
        error(function(data, status, headers, config) {
            console.log("fail");
        });

    }
    return factory;
});

任何关于此的想法都会很棒。
PS：我发现很多帖子都在讨论这个问题，但没有一个帖子能帮我找到完整的解决方案。

Any ideas about this will be great. PS: I found a lot of posts talking about this issue but none of them helped me to get a full solution.

谢谢

推荐答案

使用手表有点难看。

试试这个：

datModule.factory('datfactory', function ($http, $q){

    this.getlist = function(){            
        return $http.get('http://localhost:61686/getdatlist?format=json',{'Access-Control-Allow-Origin': 'localhost:*'})
            .then(function(response) {
              console.log(response); //I get the correct items, all seems ok here
              return response.data.itemsToReturn;
            });            
    }
    return this;
});

datModule.controller('datlist', function ($scope, datfactory){
    datfactory.getlist()
      .then(function(arrItems){
         $scope.items = arrItems;
       });
});

这就是你如何使用promise来处理异步问题。

This is how you use promises for async matter.

更新（2015年1月15日）：现在更时尚！

UPDATE (15.01.2015): Now even sleeker!

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