canLoad 守卫没有得到更新的值

Question

UPD。解决了。我使用了 2 个服务实例，但它导致了问题

我被 canLoad 守卫卡住了。当我按下组件中的按钮时，我想更改服务中的错误值并让我的 Guard 加载模块。但是 guard 只接收到一个错误的值。我怎样才能让它工作，看看我什么时候更新服务价值？看起来它没有看到值何时更改并在我更新之前触发

这是我的 AuthGuard

import { Injectable } from '@angular/core';
import { CanLoad } from '@angular/router';

import { AuthenticationService } from '../services/auth.service';

@Injectable({ providedIn: 'root' })
export class AuthGuard implements CanLoad {
 
    constructor(private authService: AuthenticationService) {}
    canLoad(): boolean {
       if (this.authService.isLogged()) {
            return true;
       } else {
           return false;
       }
      
    }
    
}

我的身份验证服务

import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';

@Injectable({ providedIn: 'root' })
export class AuthenticationService {

    private isUserLoggedIn = new BehaviorSubject(false);
    
    isLogged() {
        console.log(this.isUserLoggedIn.value); // <--- FALSE
        return this.isUserLoggedIn.value;
    }

    login() {
        this.isUserLoggedIn.next(true);
        console.log(this.isUserLoggedIn.value); // <--- TRUE
    }
}

路由：

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { AuthGuard } from './guards/auth.guard';

const routes: Routes = [
  {
    path: '',
    pathMatch: 'full',
    redirectTo: 'login'
  },
  {
    path: 'dashboard',
    loadChildren: () => import('./modules/dashboard/dashboard.module').then(m => m.DashboardModule),
    canLoad: [AuthGuard]
  },
  {
    path: 'login',
    loadChildren: () => import('./modules/login/login.module').then(m => m.LoginModule)
  },
  {
    path: '**',
    redirectTo: 'dashboard'
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

主模块

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { AuthGuard } from './guards/auth.guard';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
  ],
  providers: [AuthGuard],
  bootstrap: [AppComponent]
})
export class AppModule { }

登录模块

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { LoginComponent } from './login.component';
import { NzFormModule } from 'ng-zorro-antd/form';
import { LoginRoutingModule } from './login-routing.module';
import { NzInputModule } from 'ng-zorro-antd/input';
import { NzButtonModule } from 'ng-zorro-antd/button';
import { AuthenticationService } from 'src/app/services/auth.service';
@NgModule({
  declarations: [
    LoginComponent
  ],
  imports: [
    CommonModule,
    NzFormModule,
    LoginRoutingModule,
    NzInputModule,
    NzButtonModule
  ],
  providers: [
    AuthenticationService
  ]
})
export class LoginModule { }

登录路由模块

import { RouterModule, Routes } from '@angular/router';
import { NgModule } from '@angular/core';
import { LoginComponent } from './login.component';

const routes: Routes = [
    {
        path: '',
        pathMatch: 'full',
        component: LoginComponent
    }
];

@NgModule({
    imports: [RouterModule.forChild(routes)],
    exports: [RouterModule]
  })
  export class LoginRoutingModule {}

按钮

<button (click)="submitForm()">pressme</button>

 submitForm() {
    this.authService.login(); 
    this.router.navigate(['dashboard']);
  }

Answer 1

也许使用 observable 可以解决问题：

@Injectable({ providedIn: 'root' })
export class AuthenticationService {

    private isUserLoggedIn = new BehaviorSubject(false);
    public isUserLoggedIn$: Observable<boolean>

    constructor(){
      this.isUserLoggedIn$ = this.isUserLoggedIn.asObservable();
    }

    login() {
        this.isUserLoggedIn.next(true);
    }
}



@Injectable()
export class AuthGuard  implements CanLoad {
  constructor(private authService: AuthenticationService) {}

canLoad(route: Route,segments: UrlSegment[]): boolean|UrlTree|Observable<boolean|UrlTree>|Promise<boolean|UrlTree> {
  return this.authService.isUserLoggedIn$;  
}

}

Answer 2

canLoad() 只会在第一次尝试访问组件时接收值。 login() 完成后，尝试导航到您要加载的组件/页面，它应该可以工作。

另外，删除 BehaviorSubject 的私有信息可能会有所帮助？