@Injectable()
export class AuthGuard implements CanActivate {

public router: Router;
public serverThisLogin: ServerDataComponent;

constructor(router: Router) {
    this.router = router;
}

public canActivate(): boolean {
    if (this.serverThisLogin.isLogin)  {
        return true;
    }
    this.router.navigate(["/login"]);
    return false;
}
}

public isLogin (username: string, password: string): Observable<boolean> {
     return this.http.post( authURL + loginURL,
                             JSON.stringify({  password, username }))
     .map((response: Response) => {
         if (response.status === 200) {
             return true;
         } else {
             return false;
         }
     });
 }

{ canActivate: [AuthGuard], component: LaskComponent, path: "table_per" }