您好,我是 Angular 和 Firebase 的新手,对下一个问题感到困惑:
我有两个组件 -
授权区域(父组件)和文件夹(子组件)。授权区域有一个注销按钮,文件夹可以从 Firebase 访问身份验证数据。问题是,当用户注销时,尽管操作成功,但会出现错误消息,我正在尝试摆脱它。
父组件:授权区域
export class AuthorizedZoneComponent implements OnInit {
constructor(public authService: AuthService) { }
ngOnInit(): void {}
//btn logout listener
logout() { this.authService.logout(); }
}
<app-folders></app-folders>
<button id="logout"(click)="logout()">logout</button>`
子组件:文件夹
export interface Folder{
id:string;
name:string;
key: string;
}
//This Component is to be used only by Authorized-zone!
export class FoldersComponent implements OnInit {
private dbPath='/folders';//path to folders in realtime data base
private folderArray: Array<Folder>=[];//Array for folders: each folder has id and name
constructor(private router: Router, private route:ActivatedRoute, private db: AngularFireDatabase) {
this.db.list(this.dbPath).valueChanges().subscribe(data => {
for( let i=0; i< data.length; i++){
this.folderArray.push({id: data[i]["id"], name: data[i]["name"], key: data[i]["key"]});
}
})
}
ngOnInit(): void {}
//returns array of folders
getFolders(){ return this.folderArray;}
//on folder click listerner
onSelect(folder){}
}
<div (click)="onSelect(folder)" *ngFor="let folder of getFolders()>
<div class="folder" [id]="folder.id">{{folder.name}}</div>
</div>
auth-service 使用户能够登录和退出
事件的流程似乎运行良好。
但是,当我按下注销按钮时,尽管该功能有效,但我收到控制台错误消息:
ERROR Error: permission_denied at /folders: Client doesn't have permission to access the desired data...
我注意到如果我删除 <app-folders></app-folders>
错误不发生。
我尝试删除 <app-folders></app-folders>
在authorized-zone.component中注销之前:
//btn logout listener
logout() {
document.querySelector('app-folders').replaceWith("");
this.authService.logout();
}
它不起作用,如果有人能够解释问题并推荐解决方案,我将非常感激
最佳答案
我找到了解决方案:在文件夹组件中使用 ngOnDestroy。
private dbData;
constructor(private router: Router, private route:ActivatedRoute, private db: AngularFireDatabase) {
this.dbData=this.db.list(this.dbPath).valueChanges()
.subscribe(data => {//...
})
}
//destroy firebaseData before logging out
ngOnDestroy(){
this.dbData.unsubscribe();
}
关于angular - 注销时如何摆脱 "Error: permission_denied"? ( Angular -Firebase),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62283995/