在 ngFor 中隐藏/显示单个项目 [英] Hide/show individual items inside ngFor

问题描述

我需要显示/隐藏部分组件.这是 Angular2 示例.

I need to show / hide part of component. Here is Angular2 example.

<li *ngFor=" #item of items " >
  <a href="#" (onclick)="hideme = !hideme">Click</a>
  <div [hidden]="hideme">Hide</div>
</li>

假设我们只有 2 个项目.这里的问题是它适用于这两个项目.所以它隐藏和显示 both 组件中的 div 部分.如果我们能有这样的东西就完美了:

Suppose we have only 2 items. Problem here that it works on both items. So it hides and shows div part in both components. It could be perfect if we could have something like this:

<li *ngFor=" #item of items " >
   <a href="#" (onclick)="this.hideme = !this.hideme">Click</a>
   <div [hidden]="this.hideme">Hide</div>
</li>

那么有什么简单的方法可以解决这个问题吗?

So is there some simple way to solve this problem ?

推荐答案

你的 hideme 变量是全局的.也许您可以将其附加到当前项目:

You're hideme variable is global. Perhaps you could attach it to the current item:

<li *ngFor=" #item of items " >
  <a href="#" (onclick)="item.hideme = !item.hideme">Click</a>
  <div [hidden]="item.hideme">Hide</div>
</li>

否则，您需要使用组件中的专用对象对象.这是一个示例:

Otherwise you need to use a dedicated object object from your component. Here is a sample:

<li *ngFor="let item of items " >
  <a href="#" (onclick)="hideme[item.id] = !hideme[item.id]">Click</a>
  <div [hidden]="hideme[item.id]">Hide</div>
</li>

不要忘记在您的组件中以这种方式初始化 hideme 对象:

Don't forget to initialize the hideme object this way in your component:

hideme:<any> = {};

编辑

如果你想让它像标签一样工作，你需要做更多的工作;-)

If you want to make this work like tabs, you need a bit more work ;-)

<li *ngFor="let item of items " >
  <a href="#" (onclick)="onClick(item)">Click</a>
  <div [hidden]="hideme[item.id]">Hide</div>
</li>

并显示点击的元素并隐藏其他元素:

And to display the clicked element and hide others:

onClick(item) {
  Object.keys(this.hideme).forEach(h => {
    this.hideme[h] = false;
  });
  this.hideme[item.id] = true;
}

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