离子2&收集重复 [英] Ionic 2 & collection-repeat

问题描述

我正在制作* ng用于Ionic 2，但我想使用collection-repeat'因为它更适合广泛的数据。

I'm making *ngFor working well with Ionic 2 but I'd like to use collection-repeat 'cause it is more adapted to wide range of data.

我在construtor中加载数据：

I'm loading the data in the construtor :

import {Page, NavController, NavParams} from 'ionic-angular';
import {ListData} from './list-data';

@Page({
    templateUrl: 'build/pages/list-browser/list-browser.html',
    providers: [ListData]
})
export class ListBrowserPage {
    static get parameters() {
        return [[NavController], [NavParams], [ListData]]; // ];
    }

    constructor(nav, navParams, listData){
        this.nav = nav;

        this.items =  listData.getItems(); 
        // listData.getItems() returns a 10 000 rows JSON : 
        //  [{
        //      name: 'Al Aporte', address: '201 Thunder Wagon Common, Cataract, RI, 02987-1016, US, [phone]',
        //      name: 'Jack Adit', address: '5198 Silent Parade, Round Bottom, MD, 21542-9798, US, [phone]',
        //      ...
        //  }]
    } 
}

这是我的* ngFor视图，我的注入数据工作正常：

Here is my view with *ngFor, there my injected data is working fine :

<ion-list>
  <ion-item *ngFor="#item of items"> 
    {{ item.name }} 
  </ion-item>
</ion-list>

但是使用collection-repeat加载的相同数据不起作用：

But the same data loaded with collection-repeat doesn't work :

<ion-list>
    <ion-item collection-repeat="item in items">
        {{ item?.name }} 
    </ion-item>
</ion-list>

没有数据也没有错误。我知道这是很多数据，我可以在服务器端拆分我的JSON，但这种情况是出于基准测试的目的（Ionic 1& collection-repeat远比Ionic 2& ngFor好）。

No data and no errors. I know that this is a lot of data and that I can split my JSON on the server side but that case is for benchmarking purposes (Ionic 1 & collection-repeat is far better than Ionic 2 & ngFor).

Ionic 2 beta是否包含该指令？

Does Ionic 2 beta include that directive ?

谢谢，

Dédé

推荐答案

在Ionic 2中，collection-repeat被重命名为Virtual Scroll。

In Ionic 2, collection-repeat is renamed to Virtual Scroll.

所以Ionic 2中的Ionic 1代码将是这样的：

So your Ionic 1 code in Ionic 2 will be like this :

<ion-list [virtualScroll]="items">
  <ion-item *virtualItem="#item">{{item.name}}</ion-item>
</ion-list>

您可以在 http://ionicframework.com/docs/v2/api/components/virtual-scroll/VirtualScroll/

Josh Morony的例子 http://www.joshmorony.com/boosting-scroll-performance-in-ionic-2/

And an example by Josh Morony at http://www.joshmorony.com/boosting-scroll-performance-in-ionic-2/

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