[我正在尝试使用angular8中的reactform方法登录和注册部分,但不起作用。我没有收到任何错误,但是当我单击Submit或register按钮时,得到这样的警报消息:[object Object]。因此,我找不到解决方案。登录和注册过程无法正常进行。如果有人知道,请帮助我解决此问题。
user.service.ts:
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { User } from '../_models';
@Injectable({ providedIn: 'root' })
export class UserService {
constructor(private http: HttpClient) { }
getAll() {
return this.http.get<User[]>(`/users`);
}
getById(id: number) {
return this.http.get(`/users/` + id);
}
register(user: User) {
return this.http.post(`/users/register`, user);
}
update(user: User) {
return this.http.put(`/users/` + user.id, user);
}
delete(id: number) {
return this.http.delete(`/users/` + id);
}
}
authentication.service.ts:
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { BehaviorSubject, Observable } from 'rxjs';
import { map } from 'rxjs/operators';
import { User } from '../_models';
@Injectable({ providedIn: 'root' })
export class AuthenticationService {
private currentUserSubject: BehaviorSubject<User>;
public currentUser: Observable<User>;
constructor(private http: HttpClient) {
this.currentUserSubject = new BehaviorSubject<User>(JSON.parse(localStorage.getItem('currentUser')));
this.currentUser = this.currentUserSubject.asObservable();
}
public get currentUserValue(): User {
return this.currentUserSubject.value;
}
login(username: string, password: string) {
return this.http.post<any>(`/users/authenticate`, { username, password })
.pipe(map(user => {
// login successful if there's a jwt token in the response
if (user && user.token) {
// store user details and jwt token in local storage to keep user logged in between page refreshes
localStorage.setItem('currentUser', JSON.stringify(user));
this.currentUserSubject.next(user);
}
return user;
}));
}
logout() {
// remove user from local storage to log user out
localStorage.removeItem('currentUser');
this.currentUserSubject.next(null);
}
}
您可以如下更改登录表单提交方法
onSubmit() {
this.submitted = true;
// stop here if form is invalid
if (this.loginForm.invalid) {
return;
}
this.loading = true;
this.authenticationService.login(this.f.username.value, this.f.password.value)
.pipe(first())
.subscribe(
data => {
this.router.navigate([this.returnUrl]);
},
error => {
this.alertService.error(error.message);
this.loading = false;
});
}
请如下更改注册组件提交方法
onSubmit() { this.submitted = true; // stop here if form is invalid if (this.loginForm.invalid) { return; } this.loading = true; this.authenticationService.login(this.f.username.value, this.f.password.value) .pipe(first()) .subscribe( data => { this.router.navigate([this.returnUrl]); }, error => { this.alertService.error(error.message); this.loading = false; }); }
我所做的是从错误响应传递了消息字段。如果要为不同的http错误代码提供逻辑,则可以在此处使用它,然后根据错误代码将消息字符串传递给错误方法。如果您想通过错误代码来处理,请尝试]
onSubmit() { this.submitted = true; // stop here if form is invalid if (this.loginForm.invalid) { return; } this.loading = true; this.authenticationService.login(this.f.username.value, this.f.password.value) .pipe(first()) .subscribe( data => { this.router.navigate([this.returnUrl]); }, error => { if(error.staus === 403){ this.alertService.error("You are not authorized"); }else{ this.alertService.error("Something went wrong"); } this.loading = false; }); } }
如果您想按原样显示错误,如下更改警报组件模板
<div *ngIf="message" [ngClass]="{ 'alert': message, 'alert-success': message.type === 'success', 'alert-danger': message.type === 'error' }">{{message.text |json}}</div>