我有一个登录功能,它调用 Firebase SDK 方法来通过电子邮件进行身份验证。此 Firebase 方法返回 UserCredential
的非 null Promise,如 Firebase 文档中所述。因此,我使用 .then()
等待用户登录、通过身份验证,然后 console.log 他的信息并重定向到主页。不幸的是它不起作用。我在控制台中从 console.log(value.email);
得到未定义,从
不工作
if (this.userDetails) {
console.log("hello im user" + " " + email);
} else {
console.log("not working");
}
和errorTypeError:无法从以下位置读取未定义的属性“路由器”
:
.catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
console.log("error" + error);
});
然后一两秒后,它终于开始工作,打印出 hello im user lajmis@mail.com
from
constructor(private _firebaseAuth: AngularFireAuth, private router: Router) {
this.user = _firebaseAuth.authState;
this.loggedIn = !!sessionStorage.getItem('user');
this.user.subscribe(
(user) => {
if (user && user.uid) {
this.userDetails = user;
var email = this.userDetails.email;
console.log("hello im user" + " " + email);
this.setCurrentUser(email);
this.loggedIn = true;
console.log(this.userDetails);
} else {
this.userDetails = null;
}
}
);
}
和this.userDetails
。
为什么会发生这种情况?完整代码如下:
export class AuthService {
private user: Observable<firebase.User>;
private userDetails: firebase.User = null;
public loggedIn = false;
constructor(private _firebaseAuth: AngularFireAuth, private router: Router) {
this.user = _firebaseAuth.authState;
this.loggedIn = !!sessionStorage.getItem('user');
this.user.subscribe(
(user) => {
if (user && user.uid) {
this.userDetails = user;
var email = this.userDetails.email;
console.log("hello im user" + " " + email);
this.setCurrentUser(email);
this.loggedIn = true;
console.log(this.userDetails);
} else {
this.userDetails = null;
}
}
);
}
// Set current user in your session after a successful login
setCurrentUser(email: string): void {
sessionStorage.setItem('user', email);
this.loggedIn = true;
}
// Get currently logged in user from session
getCurrentUser(): string | any {
return sessionStorage.getItem('user') || undefined;
}
isLoggedIn() {
return this.loggedIn;
}
logUserIn(email, pass) {
firebase.auth().signInWithEmailAndPassword(email, pass).then(function(value) {
console.log(value.email);
this.router.navigate(['']);
}).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
console.log("error" + error);
});
if (this.userDetails) {
console.log("hello im user" + " " + email);
} else {
console.log("not working");
}
}
最佳答案
logUserIn
是非阻塞的 - 因此工作流程将是;
- 调用
构造函数
- 调用
this.user.subscribe
- 调用
logUserIn
- 调用
firebase.auth().signInWithEmailAndPassword
- 调用
if (this.userDetails)
- 接收来自
firebase.auth().signInWithEmailAndPassword
的响应 - 调用
.then(函数(值) {
- 调用
this.router.navigate(['']);
- 接收来自
this.user.subscribe
的响应
因此,console.log
将输出notworking
,几秒钟后,this.user.subscribe
收到user
对象。
路由器
无法访问,因为您没有使用箭头函数
。使用箭头函数
来维护对this
的访问。
也许可以尝试如下工作流程;
constructor(private _firebaseAuth: AngularFireAuth, private router: Router) {
this.user = _firebaseAuth.authState;
this.loggedIn = !!sessionStorage.getItem('user');
this.user
.subscribe(user => {
console.log('constructor user: ' + user);
this.updateUser(user);
});
}
updateUser(user) {
if (user && user.id) {
this.userDetails = user;
var email = this.userDetails.email;
console.log("hello im user" + " " + email);
this.setCurrentUser(email);
this.loggedIn = true;
console.log(this.userDetails);
} else {
this.userDetails = null;
}
}
logUserIn(email, pass) {
firebase.auth().signInWithEmailAndPassword(email, pass)
.then(user => {
console.log('logUserIn: ' + user);
this.updateUser(user);
this.router.navigate(['']);
})
.catch(error => {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
console.log("error" + error);
});
}
这样,logUserIn
和构造函数
都可以在从 Firebase 接收到用户对象时更新 userDetails
。
它还可以避免您在设置 this.userDetails
之前重定向。
关于javascript - 如何避免可观察的 Angular 延迟或确保仅当可观察准备好时才调用我的函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53732983/