当行为主题值发射时，如何触发http调用switchmap中的http调用

发布于 2025-02-01 00:42:50 字数 796 浏览 5 评论 0原文

我正在学习用声明性编写角度应用程序，但我不确定在调用帖子请求时最好的方法是什么。

我有一个带有电子邮件和密码表单的登录表单，当用户输入和单击时，提交将

onLogin() {
    if (this.loginForm?.valid) {
      this.userService.loginUserSubject.next(this.loginForm?.value)
    }
  }

在我的用户内拨打主题.next（）。服务类我遵循的服务类：

 loginUserSubject = new BehaviorSubject<IUser | null>(null);

  loginInfo$ = this.loginUserSubject.asObservable();

  $login = this.loginInfo$.pipe(
    switchMap(user => this.http.put<IUser>('/user/login', user).pipe(
      tap(response => localStorage.setItem('token', response.email)),
      catchError(error => throwError(error))
      )
    )
 )

bu，bu bu，则用户单击“未能发生”，该表格，表格。值将散发到主题，但不会执行HTTP调用，因为登录$可观察的订阅没有发生。当受试者获取值而无需订阅我的组件中的可观察到的值或使用异步管道时，我是否可以调用HTTP POST请求？

原文

I'm learning to write angular applications in a declarative and I'm not sure what the best approach is when calling POST requests.

I have a login form with email and password forms which when a user enters and clicks submit will call the subject.next()

onLogin() {
    if (this.loginForm?.valid) {
      this.userService.loginUserSubject.next(this.loginForm?.value)
    }
  }

Inside my user.service class I have following implemented:

 loginUserSubject = new BehaviorSubject<IUser | null>(null);

  loginInfo$ = this.loginUserSubject.asObservable();

  $login = this.loginInfo$.pipe(
    switchMap(user => this.http.put<IUser>('/user/login', user).pipe(
      tap(response => localStorage.setItem('token', response.email)),
      catchError(error => throwError(error))
      )
    )
 )

Bu then the user clicks submit nothing will happen, the form.value will emit to the subject but the HTTP call won't be executed because there is no subscription happening for the login$ Observable. Is there a way I can call the HTTP POST request when the subject gets the value without subscribing to the Observable in my component or using the async pipe?

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迷鸟归林 2025-02-08 00:42:50

我不确定为什么您需要在此处进行cistionubject。 IMO，您可以没有它做。

至于为什么目前不适合您，您很可能还没有订阅$ login可观察到的。

服务

public login(user: IUser): Observable<any> {
  return this.http.put<IUser>('/user/login', user).pipe(
    tap(response => localStorage.setItem('token', response.email)),
    catchError(error => throwError(error))
  );
}

组件

onLogin() {
  if (this.loginForm?.valid) {
    this.userService.login(this.loginForm?.value).subscribe({
      next: (response: any) => { },
      error: (error: any) => { }
    });
  }
}

I'm not sure why you'd need the BehaviorSubject here. IMO, you could make do without it.

As for why it isn't working for you at the moment, most probably you haven't subscribed to the $login observable.

Service

public login(user: IUser): Observable<any> {
  return this.http.put<IUser>('/user/login', user).pipe(
    tap(response => localStorage.setItem('token', response.email)),
    catchError(error => throwError(error))
  );
}

Component

onLogin() {
  if (this.loginForm?.valid) {
    this.userService.login(this.loginForm?.value).subscribe({
      next: (response: any) => { },
      error: (error: any) => { }
    });
  }
}

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泛滥成性 2025-02-08 00:42:50

仅仅因为您没有订阅主题。代码应该像。

loginUserSubject = new BehaviorSubject<IUser>({} as IUser);
loginInfo$ = this.loginUserSubject.asObservable();

$login = this.loginUserSubject.pipe(
  filter((user: IUser) => (Object.keys(user).length > 0)), // prevent object init triggered.
  switchMap(user => this.http.put<IUser>('/user/login', user)
    .pipe(
      tap(response => localStorage.setItem('token', response.email)),
      catchError(error => throwError(error))
    )
  )
).subscribe(() => {
  console.log('Im subscribing');
  // logic might need to be here.....
});

Just because you doesn't subscribe your Subject. The code should be like.

loginUserSubject = new BehaviorSubject<IUser>({} as IUser);
loginInfo$ = this.loginUserSubject.asObservable();

$login = this.loginUserSubject.pipe(
  filter((user: IUser) => (Object.keys(user).length > 0)), // prevent object init triggered.
  switchMap(user => this.http.put<IUser>('/user/login', user)
    .pipe(
      tap(response => localStorage.setItem('token', response.email)),
      catchError(error => throwError(error))
    )
  )
).subscribe(() => {
  console.log('Im subscribing');
  // logic might need to be here.....
});

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