在AngularFire，为什么在控制器中的auth.user财产空，但没有看法？ [英] In AngularFire, why is the auth.user property null in the controller, but not the view?

问题描述

有登录到火力地堡用户，并在我的看法，$ scope.auth返回当前登录的用户，我可以访问其数据。

There is a user logged into Firebase, and in my views, $scope.auth returns the current logged in user and I can access its data.

在我然而控制器，$ scope.auth.user返回null。

In my controller however, $scope.auth.user returns null.

myApp.controller('quoteController', ['$scope', '$firebase', '$firebaseSimpleLogin',
  function($scope, $firebase, $firebaseSimpleLogin) {

    $scope.auth = $firebaseSimpleLogin(dataRef);

    console.log($scope.auth.user);
  });

的console.log（$ scope.auth.user）=='空'。

console.log($scope.auth.user) == 'null'.

为什么会出现这种情况？我知道，用户登录该angularFire文档说，简单登录登录状态是全局应用程序，即使创建了多个$ firebaseSimpleLogin对象。所以，不应该$ scope.auth.user包含当前用户？

Why is this the case? I know that the user is logged in. The angularFire docs says that, "the login state for Simple Login is global to your application, even if multiple $firebaseSimpleLogin objects are created." So shouldn't $scope.auth.user contain the current user?

推荐答案

登录需要异步联系服务器。不能立即访问变量从下一行的，因为它尚未检索。此外，您还需要调用一个用户对象之前登录（）将存在。假设有一个登录从另一个页面视图，或登录（）持续被调用，您可以采取一些方法来完成你想要的。

Login requires contacting the server asynchronously. You can't immediately access the variable on the next line because it hasn't been retrieved yet. Additionally, you'll need to call login() before a user object will exist. Assuming there is a login persisted from another page view, or login() has been called, you can take a few approaches to accomplish what you want.

使用 $ getCurrentUser（）等待身份验证过程解析并获取当前认证的用户帐户：

Use $getCurrentUser() to wait for the auth process to resolve and fetch the user account that is currently authenticated:

angular.module("sampleApp", ["firebase"])
  .controller("SampleController", ["$scope", "$firebase", "$firebaseSimpleLogin",
    function($scope, $firebase, $firebaseSimpleLogin) {
      var ref = new Firebase("https://<my-firebase>.firebaseio.com/");
      $scope.auth = $firebaseSimpleLogin(ref);
      $scope.auth.$getCurrentUser().then(function(user) {
         console.log(user);
      });
    }
  ]);

利用 AUTH事件的：

angular.module("sampleApp", ["firebase"])
  .controller("SampleController", ["$scope", "$firebase", "$firebaseSimpleLogin",
    function($scope, $firebase, $firebaseSimpleLogin) {
      var ref = new Firebase("https://<my-firebase>.firebaseio.com/");
      $scope.auth = $firebaseSimpleLogin(ref);
      $scope.$on('$firebaseSimpleLogin:login', function() {
         console.log($scope.auth.user);
      });
    }
  ]);

或者您可以使用的承诺时返回登录正所谓：

angular.module("sampleApp", ["firebase"])
  .controller("SampleController", ["$scope", "$firebase", "$firebaseSimpleLogin",
    function($scope, $firebase, $firebaseSimpleLogin) {
      var ref = new Firebase("https://<my-firebase>.firebaseio.com/");
      $scope.auth = $firebaseSimpleLogin(ref);

      $scope.auth.$login('twitter').then(function() {
          console.log($scope.auth.user);
      });
    }
  ]);

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