在加载控制器之前强制 AngularJS 服务返回数据

问题描述

我在 Angular 中有一项服务，它使用我的 API 来获取用户信息并将其提供给我的控制器.设置如下:

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

在我的控制器中，我包括它:

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);

这不返回任何数据，而如果我在控制器本身中放置相同的服务功能，它返回就好了.我在这里缺少什么?之前从未在 Angular 中使用过 DI/Services，所以可能是某个地方的一个简单错误.

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.

我需要确保服务在控制器加载之前返回数据.这是怎么实现的

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

推荐答案

你可以让工厂返回这样的承诺:

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

在你的控制器中，做

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

这可以保证每当您使用该服务时，它总是同步为您提供数据，您不必在加载控制器之前加载任何数据.

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

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