力AngularJS服务负载控制器之前返回数据 [英] Force AngularJS service to return data before loading controller

问题描述

我在角一种服务，它使用我的API来获取用户信息并提供给我的控制器。它的设置是这样的：

I have a service in Angular which uses my API to get user information and provides it to my controllers. It's set up like this:

angular.module('myApp', ['myApp.filters', 'myApp.services', 'myApp.directives', 'ngResource', 'infinite-scroll', 'ui.bootstrap', 'ngCookies', 'seo'])
  .service('userInfo', function($http, $cookies){
    $http.get('/api/users/' + $cookies.id).
    success(function(data) {
      var userInfo = data.user[0];

      return userInfo;
    });
  }). // other stuff comes after this

在我的控制器，我包括它像：

In my controllers, I include it like:

function userProfile($scope, $cookies, userInfo, $http, $resource, $routeParams, $rootScope){
    $scope.user = userInfo;
    console.log('user info is')
    console.log(userInfo);

这是一个没有返回数据，而如果我把同样的服务功能的控制器本身它返回就好了。我缺少的是在这里吗？从未使用过的角DI /服务之前，所以可能是一个简单的错误的地方。

This is returning no data, while if I put the same service function in the controller itself it returns just fine. What am I missing here? Never used DI/Services in Angular before so might be a simple mistake somewhere.

我需要确保该服务返回数据的的前的控制器负载。这怎么可能完成

I need to ensure that the service returns data before the controller loads. How can this be accomplished

推荐答案

可以使工厂返回一个承诺是这样的：

You can make the factory to return a promise like this:

angular.module('myApp', ['myApp.filters', 'myApp.services', 'myApp.directives', 'ngResource', 'infinite-scroll', 'ui.bootstrap', 'ngCookies', 'seo'])
    .service('userInfo', function ($http, $cookies) {
    var promise = $http.get('/api/users/' + $cookies.id).
    success(function (data) {
        var userInfo = data.user[0];
        return userInfo;
    });
    return promise;
}) // other stuff comes after this

和在你的控制器，执行

function userProfile($scope, $cookies, userInfo, $http, $resource, $routeParams, $rootScope){
    userInfo.then(function(data){
        $scope.user = data;
    });
}

每当你使用该服务这可以保证，它总是给你数据的同步的，你不必一定要装控制器之前加载数据。

This can guarantee whenever you use the service, it always gives you the data synchronously, you don't have to necessarily to load data before loading the controller.

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