我想清除一个可观测的对象数组。我做了什么:

private pages: Observable<CustomPage[]>;
//clear
this.pages.map(p => p = []);

有没有一个直接可观察的方法(rxjs)可以在没有映射的情况下做到这一点?

最佳答案

如果你来自英雄之旅教程,你的理解可能会受到他们在那里展示的基本服务的限制。这里是一个更充分充实的服务,做你想做的速写…

export class PageService {

  private _pages = new ReplaySubject<CustomPage[]>(1);

  private _dateFilter = new ReplaySubject<DateFilterCriteria>(1);

  //Subscribe to this in your component
  get pages(): Observable<CustomPage[]> {
    return this._pages;
  }

  //Use this if you want to display the currently selected date
  //filter somewhere (e.g. on your date filter control)
  get dateFilter(): Observable<DateFilterCriteria> {
    return this._dateFilter;
  }

  //PageAccess encapsulates requests against the Http service
  constructor(private pageAccess: PageAccess) {
    this._dateFilter.subscribe(dateFilter => this.fetchPages(dateFilter));
    this.setNewDateFilter(null);
  }

  //Clears out the current list of pages, issues a new request
  //for pages
  private fetchPages(dateFilter: DateFilter) {
    this._pages.next([]);
    this.pageAccess.fetchPages(dateFilter).subscribe(pages => {
      this._pages.next(pages);
    });
  }

  //When your date filter control changes it should call this
  //method
  setNewDateFilter(dateFilter: DateFilter) {
    this._dateFilter.next(dateFilter);
  }

}

另外,我想我可以互换使用DateFilterDateFilterCriteria来表示一些类,您可以使用这些类来指示您想要的页面日期。

09-10 12:16
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