Question

在canDeactivate Guard中，我订阅确认服务。确认组件具有3个按钮，并且单击其中之一时，它将弹出枚举。如何在订阅视图中检查值，执行smth并根据值返回boolean值作为防护？

CanDeactivateGuard：

export class CanDeactivateGuard implements CanDeactivate<CanComponentDeactivate> {
      constructor(private modalDialogService: ModalService) {
      }
      canDeactivate(component: CanComponentDeactivate,
                          route: ActivatedRouteSnapshot,
                          state: RouterStateSnapshot): Observable<boolean> | boolean {
        if (!component.isUnsavedChanges()) {
          return true;
        }
        this.modalDialogService.showConfirm(ConfirmType.CAN_DEACTIVATE).subscribe(val => {
             //here I want to check value, do some functions and return true/false
    })
          }
        }

ConfirmComponent：

export class ConfirmComponent {
      subject: Subject<ConfirmAction>;

      constructor(public bsModalRef: BsModalRef) {}

      action(action: ConfirmAction):void {  //here the value of click
        this.bsModalRef.hide();
        this.subject.next(action);
        this.subject.complete();
      }
    }

    export enum ConfirmAction {
      SAVE,
      REVERT,
      CANCEl,
    }

ModalService：

export class ModalService {

  constructor(private bsModalService: BsModalService,
              private ts: TranslatorService) {}

  public showConfirm(modalDialogType: ConfirmType, extraInfo?: string): Observable<ConfirmAction> {
    let modal;
    switch (modalDialogType) {
      case ConfirmType.CAN_DEACTIVATE: {
        modal = this.bsModalService.show(ConfirmComponent, config);
        break;
      }
/*
other cases
*/
return modal.content.subject.asObservable();
}

Answer 1

canDeactivate正在等待Observable，您可以执行以下操作：

      canDeactivate(component: CanComponentDeactivate,
                          route: ActivatedRouteSnapshot,
                          state: RouterStateSnapshot): Observable<boolean> | boolean {
        if (!component.isUnsavedChanges()) {
          return true;
        }
        return this.modalDialogService.showConfirm(ConfirmType.CAN_DEACTIVATE).pipe(
            map(val => {
               // Here, do your work and return true or false
            })
        )
      }

看看Rxjs文档https://rxjs-dev.firebaseapp.com/guide/overview

我希望它能对您有所帮助！

检查订阅值并在canDeactivate中返回

1 个答案: