Question

我是Angular的新手。

我正在开发一些与promise一起运行异步的身份验证函数，并在此代码的中间执行一些操作。考虑到异步，我相信函数应该返回一个Observable。但是如何返回Observable以及promise的结果/错误？

   authentication.service.ts

    loginwithProvider(): <????> {
       this.auth.signInWithPopup(provider)
          .then( result =>{
                          /* do some things, such as getting data and logging */

                          })
          .catch( (error) => {
                          /* receive the error of the provider, do some things, such as logging */
                          })

        return ?????  <---- I want to return result and errors of the provider in an Observable to the caller function
    }


login.component.ts

onLogin(){

  this.request = this.authenticationService.loginWithProvider().subscribe(
    (data) => {
         console.log("onlogin - then success");
         this.router.navigate(['/']);
    },
    (error) => {
           console.log(" onlogin - error ", error);
           show_error_to_user(error);  <---- error from loginWithProvider
    });

}

Answer 1

我找到了一种使用ReplaySubject的方法（从Lars Bilde视频中了解到，https://www.youtube.com/watch?v=mdD2sy7r7Mk）

authentication.services.ts
loginWithProvider() : ReplaySubject<any>  {
    let resultSubject = new ReplaySubject(1);
    var provider = new firebase.auth.FacebookAuthProvider();

    this.afAuth.auth.signInWithPopup(provider)
      .then( result => {
        /* do some things, such as getting data and logging */
        console.log("result", result)
        resultSubject.next(result);
       // return result;
      }).catch( (error) => {
      /* receive the error of the provider, do some things, such as logging */
      console.log("error", error)
      resultSubject.error(error);

    })
    return resultSubject;
  }

和

login.component.ts

onlogin() {
      this.authenticationService.loginWithProvider()
      .subscribe(
        (data) => {
        console.log("onloginwithprovider - then success", data);
        this.router.navigate(['/']);
        },
        (error) => {
          console.log(" onloginwithprovider - error ", error)
        });
    }

在Angular中，如何从promise

1 个答案: