我在服务类中创建了一个行为主题.
public personObject: BehaviorSubject<any> = new BehaviorSubject<any>({
personId: 1,name: 'john doe'
});
` this._subscription.add(
this._bankService.personObject.subscribe(data => {
this.personObject = data;
console.log(data);
})
);`
但我无法在行为主题中获得准确的数据集.请帮忙.
解决方法
服务
@Injectable()
export class DataService {
private _dataListSource: BehaviorSubject<IData[]> = new BehaviorSubject([]);
dataList: Observable<IData[]> = this._dataListSource.asObservable().distinctUntilChanged();
...
getDataList(): Observable<any> {
return this.httpService.get('/data').map(res => {
this._dataListSource.next(res);
});
}
然后你可以在你的组件中使用它
export class DataComponent implements OnInit {
public dataList$: Observable<IData[]>;
constructor(public dataService: DataService) {}
ngOnInit() {
this.dataList$= this.dataService.dataList;
this.dataService.getDataList().subscribe();
}
}
和你的HTML
<div *ngIf="dataList$| async; let dataList; ">
<div *ngFor="let data of dataList">
{{ data | json}}
</div>
</div>
