我可以使用内置的角度指令重复 *ngFor 任意次数吗? [英] Can I repeat *ngFor an arbitrary number of times using built in angular directives?

问题描述

以下是我现在所拥有的:

<a href="#"><i *ngIf="product.rating.avgStars >= 1" class="fa fa-star"></i><i *ngIf="product.rating.avgStars >= 2" class="fa fa-star"></i><i *ngIf="product.rating.avgStars >= 3" class="fa fa-star"></i><i *ngIf="product.rating.avgStars >= 4" class="fa fa-star"></i><i *ngIf="product.rating.avgStars >= 5" class="fa fa-star"></i><span class="amount">({{product.rating.reviewCount}} 条评论)</span></a>

您可能已经猜到了，它会根据产品的星数重复一个星形图标.它按原样运行，但是，我觉得必须有更好的方法.理想情况下，我想使用:

<i *ngFor="+product.rating.avgStars" class="fa fa-star"></i>

我知道我可以潜在地使用指令或管道来封装此功能；我只是问有没有办法使用内置的角度指令来任意重复 HTML 标签.

解决方案

在您使用适当数量的星星填充的组件中创建一个支持数组

class RatingComponent {ngOnInit() {myRating = Array(numberOfStarsFromSomewhere).fill('whatever');}}<i *ngFor="let rating of myRating" class="fa fa-star"></i>

Below is what I have now:

<div class="reviews">
    <a href="#">
        <i *ngIf="product.rating.avgStars >= 1" class="fa fa-star"></i>
        <i *ngIf="product.rating.avgStars >= 2" class="fa fa-star"></i>
        <i *ngIf="product.rating.avgStars >= 3" class="fa fa-star"></i>
        <i *ngIf="product.rating.avgStars >= 4" class="fa fa-star"></i>
        <i *ngIf="product.rating.avgStars >= 5" class="fa fa-star"></i>
    <span class="amount">({{product.rating.reviewCount}} Reviews)</span>
</a>

As you may have guessed, it will repeat a star icon for the number of stars a product has. It works as is, however, I feel like there must be a better way. Ideally I would like to use:

<i *ngFor="+product.rating.avgStars" class="fa fa-star"></i>

I am aware that I can potentially use directives or pipes to encapsulate this functionality; I am simply asking is there is a way to use built in angular directives to arbitrarily repeat an HTML tag.

解决方案

Create a backing array in the component that you populate with the appropriate number of stars

class RatingComponent {
  ngOnInit() {
    myRating = Array(numberOfStarsFromSomewhere).fill('whatever');
  }
}

<i *ngFor="let rating of myRating" class="fa fa-star"></i>

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