我试图用以下类
实现可观察对象import {Injectable, } from '@angular/core';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/operator/share';
import {Observer} from 'rxjs/Observer';
@Injectable()
export class CalendarService {
dataChange: Observable<any>;
dataChangeObserver: Observer<any>;
constructor() {
this.dataChange = new Observable((observer) => {
this.dataChangeObserver = observer;
}).share();
}
setDate(date: any) {
this.dataChangeObserver.next(date);
}
}
当使用一个值调用setDate()
时,我得到以下错误
ORIGINAL EXCEPTION: TypeError: Cannot read property 'next' of undefined
ORIGINAL STACKTRACE:
TypeError: Cannot read property 'next' of undefined
似乎没有定义观察者dataChangeObserver
。但在调试时,我可以看到dataChangeObserver
值我设置。但离子2在调用setDate(date: any)
时却忘记了它
请查看我的问题的答案,我可以从父母向孩子发送事件,看看如何设置Observable
和如何订阅它