通過ID過濾數據

Question

你好我想只顯示包括wishlist數組中的用戶標識的數據。我做錯了什麼？

items = { "_id" : ObjectId("58016d54c6622964cc8906be"), "wishlist":[5893278927277749594, 5893278927277749595, 5893278927277749596] "country" : "Ireland" } 

管道文件

import {Pipe} from 'angular2/core'; 


@Pipe({ 
    name: 'WishListFilter' 
}) 
export class WishListPipe { 

    transform(items, args?): any { 
     return items.filter(items => items.wishlist == args.userId); 
    } 


} 

組件文件

import { WishListPipe } from './wishlist-pipe'; 

@Component({ 
    selector: 'wislist', 
    pipes: [ WishListPipe ], 
    template: ` 
    <ul> 
     <li *ngFor="let item of (items | WishListFilter:this.userId">{{item}}</li> 
    </ul> 
    ` 
}) 

export class MainSite(){ 

public userId = '5893278927277749595' 

} 

Answer 1

不要在模板中使用this：

<li *ngFor="let item of (items | WishListFilter :userId)">{{item}}</li>