将承诺转化为可观察的 [英] Convert promise to observable

问题描述

我试图把我的头围绕着观察者。我喜欢可观察的方式来解决发展和可读性问题。据我所知，好处是巨大的。

http和集合的可观察性似乎是直截了当的。我怎样才能将这样的东西转换为可观察的模式。

这是从我的服务组件，提供身份验证。我更愿意像Angular2中的其他http服务一样工作 - 支持数据，错误和完成处理。

  firebase。 （函数（firebaseUser）{
 //做些什么来更新你的UI组件
 //把用户对象传给UI组件
}）。 catch（function（error）{
 // Handle Errors here。
 var errorCode = error.code; 
 var errorMessage = error.message; 
 // ... 
}）; 
  

这里的任何帮助将不胜感激。我唯一的替代解决方案是创建EventEmitters。但我想这是一个可怕的方式来做服务部分

解决方案

试试这个：

  var subscription = Observable.fromPromise（firebase.auth（）。createUserWithEmailAndPassword（email，password））; 
 subscription.subscribe（firebaseUser => / *对收到的数据做任何事情* /，
 error => / *在这里处理错误* /）; 
  

您可以从fromPromise运算符中找到完整的引用这里

I am trying to wrap my head around observables. I love the way observables solve development and readablity issues. As I read, benefits are immense.

Observables on http and collections seem to be straight forward. How can I convert something like this to observable pattern.

This is from my service component, to provide authentication. I'd prefer this to work like other http services in Angular2 - with support for data, error and completion handlers.

firebase.auth().createUserWithEmailAndPassword(email, password).then(function(firebaseUser) {
 // do something to update your UI component
 // pass user object to UI component
}).catch(function(error) {
 // Handle Errors here.
 var errorCode = error.code;
 var errorMessage = error.message;
 // ...
});

Any help here would be much appreciated. The only alternative solution I had was to create EventEmitters. But I guess that's a terrible way to do things in services section

解决方案

try this:

var subscription = Observable.fromPromise(firebase.auth().createUserWithEmailAndPassword(email, password));
subscription.subscribe(firebaseUser => /* Do anything with data received */,
                       error => /* Handle error here */);

you can find complete reference to fromPromise operator here

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