修复AngularJS错误:提供程序必须从$ get工厂方法返回值 [英] Fixing AngularJS error: Provider must return value from $get factory method

问题描述

当我使用下面的代码时，出现以下错误:

When I use the code below, I am getting the following error:

提供者登录"必须从$ get工厂方法返回一个值.

Provider 'Login' must return a value from $get factory method.

我已经查看了stackoverflow帖子此处，但无法弄清楚我在做什么错.

I've reviewed the stackoverflow posts here and here, but can't figure out what I'm doing wrong.

myApp.factory('Login', function($location, $firebaseAuth, Ref, Auth) {
    var authData = Ref.getAuth();

   if (authData) {console.log('already logged in with ' + authData.uid)} else {

      return Auth.$authAnonymously({rememberMe: true}).then(redirect, showError);

      function redirect() {
      $location.path('/account');
    }

      function showError(err) {
      Login.err = err;
    }
  }
});

推荐答案

对于factory，您必须返回一个对象.由于您不返回任何内容，这意味着其他服务/控制器无法使用此服务.

In terms of factory you must return an object. Since you're not returning anything, it means that other services/controllers can't use this service.

如果仅检查身份验证，则该身份验证必须在Auth服务内部，该服务必须是IIFE函数.它将检查并重定向用户.

If you're just checking for Authentication, it must be inside your Auth service which must be an IIFE function. Which will check and redirect the user.

例如:

在任一Auth/Ref服务中，创建一个IIFE

In either Auth/Ref service, create a IIFE

(function() {
var authData = Ref.getAuth();

   if (authData) {console.log('already logged in with ' + authData.uid)} else {

      return Auth.$authAnonymously({rememberMe: true}).then(redirect, showError);

      function redirect() {
      $location.path('/account');
    }

      function showError(err) {
      Login.err = err;
    }
  }
})();

否则，将代码插入init()方法中，然后在您的服务中调用该代码.因此，它将仅运行一次.

Else insert the code inside init() method and call that in your service. SO this will run only once.

当要向应用程序的其他部分公开单例接口时，必须使用服务.

You must use service when you want to expose a singleton interface for other parts of your application to make use of.

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