如何在angular2中的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，它遍历一个数组.但是，我添加了一个条件，即当索引为< 5时，请继续添加标签.然后，我只想添加一个额外的标签，然后将其用于下拉菜单以查看其余标签.但这不起作用.

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>

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个标签之后有一个按钮，该按钮将用于显示带有下拉菜单的下拉菜单其余标签.

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.

在angular2中可以做到吗?

Is this possible to do in angular2?

如果是的话，请赐教.

推荐答案

<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

要获取所有添加的内容，但要添加第5项之后添加的<div>DropDown Button</div>，可以使用:

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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