Angular 嵌套类别和 *ngFor 循环 [英] Angular Nested categories and *ngFor loop

问题描述

我有一个未定义数量的数组，可以无限嵌套.我将在我列出产品的页面上的过滤"部分中使用它.但是我无法动态弄清楚如何在 html 端创建它.

<预><代码>[{"name": "模型",项目": [{"name": "面料","fieldType": "复选框",子类别":[]},{"name": "亚麻布","fieldType": "复选框",子类别":[{"name": "彩色","fieldType": "复选框",子类别":[]},{"name": "纯色","fieldType": "复选框",子类别":[{"name": "黑色","fieldType": "复选框",子类别":[]},{"name": "白","fieldType": "复选框",子类别":[]},{"name": "红色","fieldType": "复选框",子类别":[]}]}]}]},{"name": "其他",项目": [{"name": "单选按钮","fieldType": "复选框",子类别":[{"name": "电台 01","fieldType": "收音机",子类别":[]},{"name": "广播 02","fieldType": "收音机",子类别":[]}]}]}]

在HTML"方面，我正在尝试创建这样的代码.

 
<span class="filter-item-title">模型</span><ul><li><mat-checkbox color="primary">Fabric</mat-checkbox><li><mat-checkbox color="primary">亚麻布</mat-checkbox><ul><li><mat-checkbox color="primary">Colored</mat-checkbox></li><li><mat-checkbox color="primary">纯色</mat-checkbox><ul><li><mat-checkbox color="primary">Black</mat-checkbox></li><li><mat-checkbox color="primary">White</mat-checkbox></li><li><mat-checkbox color="primary">Red</mat-checkbox></li>
<div class="filter-item"><span class="filter-item-title">其他</span><ul><li><mat-checkbox color="primary">单选按钮</mat-checkbox><ul><li><mat-radio-group aria-label="选择一个选项"><mat-radio-button color="primary" value="1">Radio 01</mat-radio-button><mat-radio-button color="primary" value="2">Radio 02</mat-radio-button></mat-radio-group>

这是我的实时示例:https://stackblitz.com/edit/angular-yzdxca如果您能分享您的想法，我将不胜感激.谢谢.

解决方案

我只是提出想法，所以之后再调整.

这称为递归组件，它是带条件调用的.

recursive.component.html

你的内容在这里
<!-- 递归调用--><app-recursive [data]="data" *ngIf="data"></app-recursive>

通过使组件调用自身，只要其中有数据，就可以使其重复.然后，您对其应用一个条件，该条件表明如果数据为空，则停止显示它.

但是要小心:这种组件很重，当你不管理你的数据时，你可能会让你的应用程序崩溃.我建议先考虑您的模型并对其进行改进.

I have an undefined number of arrays that can go nested unlimited. I will use this in the "filtering" section on a page where I list products. But I couldn't dynamically figure out how to create it on the html side.

[
    {
      "name": "Models",
      "items": [
        {
          "name": "Fabric",
          "fieldType": "checkbox",
          "subCategories": []
        },
        {
          "name": "Linen",
          "fieldType": "checkbox",
          "subCategories": [
            {
              "name": "Colored",
              "fieldType": "checkbox",
              "subCategories": []
            },
            {
              "name": "Solid Color",
              "fieldType": "checkbox",
              "subCategories": [
                {
                  "name": "Black",
                  "fieldType": "checkbox",
                  "subCategories": []
                },
                {
                  "name": "White",
                  "fieldType": "checkbox",
                  "subCategories": []
                },
                {
                  "name": "Red",
                  "fieldType": "checkbox",
                  "subCategories": []
                }
              ]
            }
          ]
        }
      ]
    },
    {
      "name": "Other",
      "items": [
        {
          "name": "Radio Buttons",
          "fieldType": "checkbox",
          "subCategories": [
            {
              "name": "Radio 01",
              "fieldType": "radio",
              "subCategories": []
            },
            {
              "name": "Radio 02",
              "fieldType": "radio",
              "subCategories": []
            }
          ]
        }
      ]
    }
  ]

On the "HTML" side, I am trying to create a code like this.

  <div class="filter-item">
    <span class="filter-item-title">Models</span>
    <ul>
      <li>
        <mat-checkbox color="primary">Fabric</mat-checkbox>
      </li>
      <li>
        <mat-checkbox color="primary">Linen</mat-checkbox>
        <ul>
          <li><mat-checkbox color="primary">Colored</mat-checkbox></li>
          <li>
            <mat-checkbox color="primary">Solid Color</mat-checkbox>
            <ul>
              <li><mat-checkbox color="primary">Black</mat-checkbox></li>
              <li><mat-checkbox color="primary">White</mat-checkbox></li>
              <li><mat-checkbox color="primary">Red</mat-checkbox></li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>
  </div>
  <div class="filter-item">
    <span class="filter-item-title">Other</span>
    <ul>
      <li>
        <mat-checkbox color="primary">Radio Buttons</mat-checkbox>
        <ul>
          <li>
            <mat-radio-group aria-label="Select an option">
              <mat-radio-button color="primary" value="1">Radio 01</mat-radio-button>
              <mat-radio-button color="primary" value="2">Radio 02</mat-radio-button>
            </mat-radio-group>
          </li>
        </ul>
      </li>
    </ul>
  </div>

Here's my live sample: https://stackblitz.com/edit/angular-yzdxca I'd appreciate it if you could share your ideas. Thanks.

解决方案

I'm just giving out the idea, so adapt it afterwards.

This is called a recursive component, it's called with conditions.

recursive.component.html

<div>
  your content goes here
</div>
<!-- recursive calling -->
<app-recursive [data]="data" *ngIf="data"></app-recursive>

By making the component call itself, you make it repeat as long as there is data in it. Then, you apply a condition on it, which states that if the data is empty, then you stop displaying it.

Be careful though : this kind of components are heavy and when you do not manager your data, you can make your application crash. I would recommend thinking about your model and improving it first.

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