TypeScript BehaviorSubject.asObservable方法代碼示例

  it('#calculateStandings should do nothing if there aren\'t any players', () => {
    const playersSubject = new BehaviorSubject<Player[]>([]);
    const fakePlayerService = {
      players: playersSubject.asObservable()
    };
    const submittedPairingsSubject = new BehaviorSubject<Pairing[]>([]);
    const fakePairingService = {
      submittedPairings: submittedPairingsSubject.asObservable()
    };

    service = new StandingsService(fakePairingService as PairingService, fakePlayerService as PlayerService);
  });

 constructor(
     private dataService: BhmcDataService,
     private memberService: MemberService,
     private configService: ConfigService,
     private errorHandler: BhmcErrorHandler
 ) {
     this.config = this.configService.config;
     if (!this._currentUser) {
         let storedUser = this.getFromStorage('bhmc_user', true);
         if (!storedUser) {
             this._currentUser = new User();
             this.saveToStorage('bhmc_user', JSON.stringify(this._currentUser)); // session storage
         } else {
             this._rememberUser = true;
             this._currentUser = Object.assign(new User(), JSON.parse(storedUser)); // TODO: IE polyfill
             if (this._currentUser.member && this._currentUser.member.birthDate) {
                 this._currentUser.member.birthDate = moment(this._currentUser.member.birthDate);
             }
             this.errorHandler.setUserContext(this._currentUser);
         }
     }
     this.currentUserSource = new BehaviorSubject(this._currentUser);
     this.currentUser$ = this.currentUserSource.asObservable();
     this.dataService.lastError$.subscribe(err => this.onError(err));
 }

    getWorkItemList(idList: Array<number>) : Observable<WorkItemList> {
        let returnValue = new WorkItemList();
        let subject = new BehaviorSubject<WorkItemList>(null);

        if (idList.length > 0) {
            let server = this.window.localStorage.getItem('server');
            
            let workItemUrl = server + '/DefaultCollection/_apis/wit/WorkItems?ids=' + idList.join() + '&fields=System.Id,System.WorkItemType,System.Title,System.AssignedTo,System.State&api-version=1.0';

            this.oAuthHttp.get(workItemUrl).subscribe(res => {
                let result = res.json();

                result.value.forEach(workItemJson => {
                    let workItem = new WorkItem();
                    workItem.populate(workItemJson);
                    returnValue.push(workItem);
                });

                subject.next(returnValue);
            });
        }
        else {
            subject.next(returnValue);
        }

        return subject.asObservable();
    }

      beforeEach(async(() => {
        dispatcher = new ListStateDispatcher();
        state = new ListState(dispatcher);

        /* tslint:disable */
        let itemsArray = [
          { id: '1', column1: '30', column2: 'Apple',
            column3: 1, column4: moment().add(1, 'minute') },
          { id: '2', column1: '01', column2: 'Banana',
            column3: 3, column4: moment().add(6, 'minute') },
          { id: '3', column1: '11', column2: 'Banana',
            column3: 11, column4: moment().add(4, 'minute') },
          { id: '4', column1: '12', column2: 'Carrot',
            column3: 12, column4: moment().add(2, 'minute') },
          { id: '5', column1: '12', column2: 'Edamame',
            column3: 12, column4: moment().add(5, 'minute') },
          { id: '6', column1: null, column2: null,
            column3: 20, column4: moment().add(3, 'minute') },
          { id: '7', column1: '22', column2: 'Grape',
            column3: 21, column4: moment().add(7, 'minute') }
        ];

        bs = new BehaviorSubject<Array<any>>(itemsArray);
        items = bs.asObservable();

        TestBed.configureTestingModule({
          imports: [
            ListFixturesModule,
            SkyListModule,
            SkyListViewGridModule,
            SkyListToolbarModule,
            FormsModule
          ],
          providers: [
            { provide: 'items', useValue: items }
          ]
        })
        .overrideComponent(SkyListComponent, {
          set: {
            providers: [
              { provide: ListState, useValue: state },
              { provide: ListStateDispatcher, useValue: dispatcher }
            ]
          }
        });

        fixture = TestBed.createComponent(ListSelectedTestComponent);
        nativeElement = fixture.nativeElement as HTMLElement;
        element = fixture.debugElement as DebugElement;
        component = fixture.componentInstance;

        fixture.detectChanges();

        // always skip the first update to ListState, when state is ready
        // run detectChanges once more then begin tests
        state.skip(1).take(1).subscribe(() => fixture.detectChanges());
        fixture.detectChanges();

      }));

 private getSpinnerSource(name: string): BehaviorSubject<boolean> {
     if (this.sources.has(name)) {
         return this.sources.get(name);
     }
     let subject = new BehaviorSubject(false);
     this.sources.set(name, subject);
     this.spinners.set(name, subject.asObservable());
     return this.sources.get(name);
 }

 getSpinner(name: string): any {
     if (this.spinners.has(name)) {
         return this.spinners.get(name);
     }
     let subject = new BehaviorSubject(false);
     this.sources.set(name, subject);
     this.spinners.set(name, subject.asObservable());
     return this.spinners.get(name);
 }

	// I read the messages collection as a stream. Returns an Observable stream.
	public readMessagesAsStream() : Observable<Message[]> {

		// Push messages into the BehaviorSubject. This will ensure that the Subject has
		// been primed with data by the time the calling context goes to subscribe to the
		// stream. Which will, in turn, ensure that the messages collection is pushed to
		// the observer upon subscription.
		this.emitMessages();

		return( this.subject.asObservable() );

	}

  constructor() {

    this.sizes = new Map([
      ['mobile', 168],
      ['tablet', 192],
      ['screen', 256],
    ]);

    const firstDims = this.setDims();

    this.listDims = new BehaviorSubject(firstDims);
    this.listDimensions$ = this.listDims.asObservable();

    this.scrollPos = new BehaviorSubject(0);
    this.scrollPosition$ = this.scrollPos.asObservable();


    this.scrollTo = new BehaviorSubject(0);
    this.scrollSetTo$ = this.scrollTo.asObservable();

  }

  it('#createPairings should give error with 0 players', () => {
    const fakeSubject = new BehaviorSubject<Player[]>([]);
    const fakePlayerService = {
      activePlayers: fakeSubject.asObservable()
    };
    pairingService = new PairingService(fakePlayerService as PlayerService);
    const createPairings = function() {
      pairingService.createPairings(1, false);
    };

    expect(createPairings).toThrowError(Error);
  });