为单个 `ngFor` 迭代创建两个元素? [英] Create two elements for a single `ngFor` iteration?
问题描述
我正在循环访问一组模型，并希望为每个模型显示一个元素.但是，由于 CSS 原因，当我到达第四个模型时，我必须添加另一个元素(我需要添加一个 Bootstrap clearfix 元素以使布局看起来不错).
<ol class="row"><li *ngFor="#card of Deck; #i = index" class="col-xs-3"><h3>{{ card.name }}</h3></ol>如果(i + 1) % 4 === 0，然后加上这个li加上另一个<li class="clearfix"></li>?
这可以通过
<ol class="row"><ng-container *ngFor="让一副牌" let-i="index"><h3>{{ card.name }}</h3> <li *ngIf="(i + 1) % 4 === 0" class="clearfix"></li></ng-容器></ol><小时>
另一种方法(在
这可以通过带有显式 标签的长 ngFor 表单来完成，例如
<ol class="row"><模板 ngFor let-card [ngForOf]="deck" let-i="index"><h3>{{ card.name }}</h3> <li *ngIf="(i + 1) % 4 === 0" class="clearfix"></li></ol>另见 https://angular.io/docs/ts/latest/api/common/index/NgFor-directive.html
I am looping on a collection of models and want to show one element per model. However, for CSS reasons, I must add another element when I reach the forth model (I need to add a Bootstrap clearfix element for the layout to look good).
<div class="jumbotron">
<ol class="row">
<li *ngFor="#card of deck; #i = index" class="col-xs-3">
<h3>{{ card.name }}</h3>
</li>
</ol>
</div>
How do I say if (i + 1) % 4 === 0, then add this li plus another <li class="clearfix"></li>?
This can be done with the <ng-container> helper element
<div class="jumbotron">
<ol class="row">
<ng-container *ngFor="let card of deck" let-i="index">
<li class="col-xs-3">
<h3>{{ card.name }}</h3>
</li>
<li *ngIf="(i + 1) % 4 === 0" class="clearfix"></li>
</ng-container>
</ol>
</div>
An alternative approach (used before <ng-container> became available)
This can be done with the long ngFor form with an explicit <template> tag like
<div class="jumbotron">
<ol class="row">
<template ngFor let-card [ngForOf]="deck" let-i="index">
<li class="col-xs-3">
<h3>{{ card.name }}</h3>
</li>
<li *ngIf="(i + 1) % 4 === 0" class="clearfix"></li>
</template>
</ol>
</div>
See also https://angular.io/docs/ts/latest/api/common/index/NgFor-directive.html
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