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感谢您阅读此问题。Angular 2,Observable更新添加项目,但不删除
无论如何,我已经创建了一个处理项目列表(具有名称和价格)的服务。此服务返回ListComponent订阅的可观察项。
奇怪的是,当我添加一个项目时,订阅工作和ListComponent列表被更新,当我删除一个项目时,订阅不起作用,它不会发送任何错误。
ListComponent:
export class ListComponent {
listItems: ListItem[];
itemName: string;
itemPrice: number;
constructor(private listService: ListItemService){
this.listService.getItems().subscribe((res) => {
this.listItems=res;
},
(error)=>{
console.log(error);
})
}
public addNewItem(itemName:string,itemPrice:number):void{
this.listService.create(itemName,itemPrice);
}
public deleteItem(itemName:string){
this.listService.delete(itemName);
}
}
ListService:
@Injectable()
export class ListItemService {
private listItems:ListItem[] = [];
private listObservable: Observable<ListItem[]>;
constructor() {
this.listItems.push(new ListItem("item1",100));
this.listItems.push(new ListItem("item2",200));
this.listItems.push(new ListItem("item3",300));
this.listItems.push(new ListItem("item4",400));
this.listObservable = Observable.of(this.listItems);
}
getItems(): Observable<ListItem[]> {
return this.listObservable;
}
getItemById(name: String): Promise<ListItem> {
return new Promise((resolve) =>{
resolve(this.getListItemByName(name));
})
}
delete(name: String): Promise<ListItem[]> {
let item = new ListItem(name,0);
this.listItems = this.listItems.filter((item:ListItem)=>item.name !== name);
return new Promise((res)=>{
res(item);
})
}
create(name: string, price:number): Promise<ListItem> {
let item: ListItem = new ListItem(name,price);
this.listItems.push(item);
return new Promise((res)=>{
res(item);
})
}}
感谢您阅读(希望帮助)
请给予好评,并接受了答案是否能解决你的问题。谢谢! – dlsso