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angular - 如何在 Angular 中创建应用程序级别的全局计时器？

问题描述

我希望有一个计时器，无论我在我的应用程序中的哪个页面上，它都会在特定时间自动logout()触发。authentication.service

我尝试在我的身上创建一个计时器，AuthenticationService但问题是如果我重定向到另一个页面..这个计时器就会丢失。

身份验证服务：

@Injectable()
export class AuthenticationService {
  ticks =0;
    timer :Observable<number>;
  constructor(private http: Http, private _JwtHelper: JwtHelper, private router: Router) {
  }

  isLoggedIn() {
    console.log('authentication service islogged in called ')
    let token = localStorage.getItem('token');
    if (!token) { return false; }
    else {
      return true;
    }
  }

  login(credentials) {
    return this.http.post('http://somthing/api/login/login',
      credentials)
      .map(response => {
        let result = response.json();
        if (result && result.token) {
          localStorage.setItem('token', result.token);

           this.timer = Observable.timer(7000,1000);
    this.timer.subscribe(t=> {
        this.func(this);
    });


          return true;
        }
        return false;
      });
  }
func(t){
   this.logout();
   t.unsubscribe();
}
  logout(): void {

    localStorage.removeItem('token');
    this.router.navigate(['/login']);

  }

}

我考虑过在 app.component 上创建计时器，但是我只想在从登录表单调用身份验证服务的登录功能时订阅计时器。

标签： angulartypescriptrxjsangular5

解决方案

我通过创建解决了它：

CanActivateViaAuthGuard.service 

@Injectable()
export class CanActivateViaAuthGuard implements CanActivate {

  constructor(private authService: AuthenticationService, private router: Router) {}

  canActivate() {         

        if(this.authService.isLoggedIn()==false ){
            this.router.navigate(['/login']);
            return false;
        }
        else{
            return true;
        }
  }
}

身份验证服务：

 isLoggedIn() {

let token = localStorage.getItem('token');
if (!token) { return false; }
else {
  this.setTimeOutTimer();
  return true;
}
  }



setTimeOutTimer() {
    console.log('**setTimeOutTimer**')
    if(this.sub){
      this.sub.unsubscribe();
    }
 let expiry=this.currentUser.exp;

    this.timer = Observable.timer(1000, 1000);

    this.sub = this.timer.subscribe(t => {
      let timenow= moment().format('X'); 
      console.log(expiry + ' '+timenow );
      if(expiry<timenow){

        this.sub.unsubscribe();
      this.logout();

      }
    });
  }


get currentUser() {
    let token = localStorage.getItem('token');
    if (!token) return null;
    return this._JwtHelper.decodeToken(token);
  }

路线：

const routes: Routes = [
  {path: '', canActivate:[CanActivateViaAuthGuard], children:[
    {path:'home', component: HomeComponent},//,canActivate:[CanActivateViaAuthGuard]
    {path:'dummy', component: DummyComponent},...
    ...
    ...

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