如何在angular2的ngFor中显示1个元素? [英] How to show 1 element in ngFor in angular2?

问题描述

我有一个简单的 ngFor 循环数组.但是，我添加了一个条件，即索引为 <5 继续添加标签.之后，我想添加一个额外的标签，将使用下拉列表查看其余标签.但它不起作用.

<a *ngIf="i<5" href="#" class="span-tag tag">{{ tag }}</a><div *ngIf="module.Tags.length > 5 && i == 6">下拉按钮</div>

这里的功能是我不想向用户显示无限数量的标签，我想将其限制为仅 5 个标签，并在 5 个标签后有一个按钮，用于显示带有剩余标签.

这可以在 angular2 中实现吗?

如果有，请赐教.

解决方案

<a href="#" class="span-tag tag">{{ tag }}</a><div *ngIf="last">下拉按钮</div>

https://angular.io/docs/ts/latest/api/common/index/SlicePipe-pipe.html

要添加所有内容，但可以使用在第 5 个项目之后添加的

DropDown Button

:

show = 5;<li *ngFor="let tag of module.Tags|slice:0:show let i=index"><a href="#" class="span-tag tag">{{ tag }}</a><div *ngIf="i==4 && show == 5" (click)="show = module.Tags.length">下拉按钮</div>

I have a simple ngFor that loops through an array. However, I've added a condition that while the index is < 5 keep add the tag. and After that, I want to add an extra tag just once that will be used a dropdown to view the rest of the tags. But it doesn't work.

<li *ngFor="let tag of module.Tags; let i = index">
  <a *ngIf="i<5" href="#" class="span-tag tag">{{ tag }}</a>
  <div *ngIf="module.Tags.length > 5 && i == 6">DropDown Button</div>
</li>

The feature here is that I don't want to show unlimited number of tags to the user, I want to limit it to only 5 tags, and have a button after 5 tags which will be used to show the dropdown with the remaining tags.

Is this possible to do in angular2?

If so, please enlighten me.

解决方案

<li *ngFor="let tag of module.Tags | slice:0:5; let last=last">
  <a href="#" class="span-tag tag">{{ tag }}</a>
  <div *ngIf="last">DropDown Button</div>
</li>

https://angular.io/docs/ts/latest/api/common/index/SlicePipe-pipe.html

To get all added but the <div>DropDown Button</div> added after the 5th item you can use:

show = 5;

<li *ngFor="let tag of module.Tags|slice:0:show let i=index">
  <a href="#" class="span-tag tag">{{ tag }}</a>
  <div *ngIf="i==4 && show == 5" (click)="show = module.Tags.length">DropDown Button</div>
</li>

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