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
DateFilter
和DateFilterCriteria
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。