我有AngularJs控制器：

I have the AngularJs controller:

function MyController($scope, $http) {
   // as $http.get() is async, success() returns promise but 
   // I need the actual value 'items'
   var promise = $http.get(...)
       .success(function(response) {return response.items;});
   <waitForAjaxCall>
   $scope.items = promise.get?();
   $scope.firstItem = $scope.items[0];

   //do stuff using $scope.firstItem
}

var myApp = angular.module('myApp',[]);
myApp.controller('MyController', ['$scope', '$http', MyController]);

我如何确保 $ scope.items 是由之前的 $ scope.firstItem =由Ajax调用返回的值初始化.. 分配？另一种方法我看到的是在angularjs工厂调用$ HTTP包项目，但我仍然需要等待AJAX​​调用来完成这个工厂里面。

How can I ensure that $scope.items is initialized by a value returned by the ajax call before the $scope.firstItem = ... assignment? Another approach I see is to wrap items in angularjs factory that calls $http, but I still need to wait for the ajax call to complete inside this factory.

推荐答案

您不能等待同步的Ajax调用来完成。你需要初始化成功之内的范围回调：

You can't wait synchronously for the Ajax call to complete. You need to initialize the scope within the success callback:

function MyController($scope, $http) {
    function init(items) {
        $scope.items = items;
        $scope.firstItem = $scope.items[0];

        //do stuff using $scope.firstItem
    }

    $http.get(...)
        .success(function(data) {
            init(data.items);               
        });
}