我正在使用带布线的Angular材质。点击事件后,我希望我的应用程序将转到一个包含参数currentUser
的URL。以下是app.component.html文件中的单击事件:
<button mat-icon-button class="icon shopping cart-icon" aria-label="Icon-button with shopping cart icon" (click)="getCartByUser()" [routerLink]="['/carts/cart_by_user/', currentUser]" routerLinkActive="active">
<mat-icon>shopping_cart</mat-icon>
</button>
app-routing.module.ts:
const routes: Routes = [
{path: 'carts/cart_by_user/:cartOfUser', component: CartComponent, pathMatch:'full'}
];
@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule {}
问题是,当我执行应用程序和点击事件时,会显示以下错误:
的Http失败响应http://localhost:8080/carts/cart_by_user/$%7用户%7D:400 OK控制台中的错误:
错误错误:未捕获(承诺中(:错误:无法匹配任何路由。URL段:carts/cart_by_user;id=9;代码=000;…'
app.component.ts文件:
export class AppComponent implements OnInit {
public currentUser!: User;
public currentLogIn:boolean=false;
constructor(private shared: SharedService, private cartService:CartService){}
ngOnInit():void {
this.shared.castCart.subscribe(cart=>this.cart=cart);
this.shared.castUser.subscribe(currentUser=>this.currentUser=currentUser);
this.shared.castLoggedIn.subscribe(currentLogIn=>this.currentLogIn=currentLogIn);
}
public getCartByUser():void{
if(this.currentLogIn){
this.cartService.getCartByUser(this.currentUser).subscribe(
(response: Cart) => {
this.cart=response;
this.shared.setCart(this.cart);
console.log(response);
},
(error: HttpErrorResponse)=>{
alert(error.message);
}
)
}
}
shared.service.ts:
export class SharedService {
public defaultCart!: Cart;
private cart= new BehaviorSubject<Cart>(this.defaultCart);
castCart = this.cart.asObservable();
public defaultUser!: User;
private user= new BehaviorSubject<User>(this.defaultUser);
castUser = this.user.asObservable();
private loggedIn= new BehaviorSubject<boolean>(false);
castLoggedIn = this.loggedIn.asObservable();
setCart(data: Cart){
this.cart.next(data); }
setUser(data: User){
this.user.next(data); }
setLoggedIn(data:boolean){
this.loggedIn.next(data); }
}
cart.service.ts:
export class CartService {
constructor(private http: HttpClient) { }
public getCartByUser(user : User): Observable<Cart> {
return this.http.get<Cart>('http://localhost:8080/carts/cart_by_user/${user}');
}
}
您的currentUser
不仅仅包含字符串。这是一个对象,有id=9;code=000...
,它找不到以这样的params结尾的url。只使用用户的id如何?Refactor将您使用的url参数user
对象放置为仅user.id
。
这是两个不同的错误。
错误1
h的Http失败响应ttp://localhost:8080/carts/cart_by_user/$%7用户%7D:400 OK
来自cart.service.ts。您正试图使用单引号进行字符串插值。如果你想要字符串插值,你需要使用反标记。
export class CartService {
constructor(private http: HttpClient) { }
public getCartByUser(user : User): Observable<Cart> {
return this.http.get<Cart>(`http://localhost:8080/carts/cart_by_user/${user}`);
}
然而,我不知道用户对象是什么样子,也不知道你的api是什么样子的,所以我不知道这是否会给你正确的get请求。
错误2
错误错误:未捕获(承诺中(:错误:无法匹配任何路由。URL段:carts/cart_by_user;id=9;代码=000;…'
您可以看到cart_by_user后面缺少一个/
。我相信routerLink
在路径段之间添加了一个/
,这可能是您的错误。只需移除尾随的/
[routerLink]="['/carts/cart_by_user', currentUser]"