我如何创建一个嵌套的递归表，该表可以以角度钻取X级别

Question

我需要制作带有嵌套子任务的数据的表。我需要使这个表递归。关于NGFOR的文献有很多文献递归显示数据，但没有以表格格式显示。有很多事情使桌子更难使用（例如，使用TD标签之外的DIV标签等）

）

这是我到目前为止得到的堆叠。

https://stackblitz.com/edit/angular-xk9nw6?file=src/app/table/table;

您可以看到，我只能在遇到NGFOR

的问题之前向下钻一个级别

<H1 style="text-indent: 10px">Table</H1>
<style>
table{
  background:rgb(223, 221, 221);
}
</style>
<table  class="table">
  <thead>
  <tr>
    <th>expand</th>
    <th>task id</th>
    <th>task name</th>
    <th>button</th>
  </tr>
</thead>  
<tbody *ngFor="let datum of data; index as i">
  <tr>
      <td class="" (click)="task(datum, i); $event.stopPropagation()" > 
        <i [ngClass]="(index != i)?'fas fa-plus':'fas fa-minus'"></i> 
      </td>
      <td class="">{{datum.taskID}}</td>
      <td class="">{{datum.taskName}}</td>
      <td ALIGN="center">
        <!-- <i class="fas fa-ellipsis-h" data-toggle="dropdown"></i> -->

          <select>        
               <option (click)="dropdown(datum)" value="add">Add</option>
               <option (click)="dropdown(datum)" value="edit">Edit</option>
               <option (click)="dropdown(datum)" value="delete">Delete</option>
          </select>
        </td> 
  </tr>
  <tr [hidden]="index != i" *ngFor="let subtask of datum.subtasks; index as j" >
    <div [hidden]="!subtask.subtasks">
      <td class="" style="text-indent: 15px" (click)="subtaskQ(subtask, j)"> <i class="fas fa-plus"></i> </td>
    </div>
    <div [hidden]="subtask.subtasks">
        <td class="" style="text-indent: 15px" (click)="subtaskQ(subtask, j)"></td>
    </div>
      <td class="">{{subtask?.taskID}}</td>
      <td class="">{{subtask?.taskName}}</td>
      <td ALIGN="center">
          <select>        
               <option (click)="dropdown(subtask)" value="add">Add</option>
               <option (click)="dropdown(subtask)" value="edit">Edit</option>
               <option (click)="dropdown(subtask)" value="delete">Delete</option>
          </select>
        </td>
  </tr>
  <tr [hidden]="index != i && index !=j" *ngFor="let subtaskL of subtask; index as e" >
        <td class="" style="text-indent: 15px" (click)="subtaskQ(subtask, j)"></td>
        <td class="">{{subtaskL?.taskID}}</td>
        <td class="">{{subtaskL?.taskName}}</td>
        <td ALIGN="center">
            <select>        
                 <option (click)="dropdown(subtask)" value="add">Add</option>
                 <option (click)="dropdown(subtask)" value="edit">Edit</option>
                 <option (click)="dropdown(subtask)" value="delete">Delete</option>
            </select>
          </td>
    </tr>
</tbody> 

</table>

组件

import { Component, OnInit,ViewChild } from '@angular/core';
import { sampleData } from '../datasource';
@Component({
  selector: 'app-table',
  templateUrl: './table.component.html',
  styleUrls: ['./table.component.css']
})
export class TableComponent implements OnInit {
  constructor() { }
  @ViewChild('treegrid')
  public data: Object[];
  public foo: boolean;
  public subtaskArray: any;
  public subSubtaskArray: any;
  public index: number;
  dropdown(e){
    console.log(e);
  }
  task(e, i){
    console.log(e);
    this.subtaskArray = e.subtasks
    this.index = i;
  }
  subtaskQ(e, j){
    this.subSubtaskArray = e.subtasks;
    console.log(j);
    console.log(e);
  }
  switch(){
    if(this.foo){
      this.foo =false;
    } else {
    this.foo = true;
    }
  }
  ngOnInit(): void {
    this.data = sampleData;
}
}

样本数据

/**
 * Test cases data source
 */
export let sampleData: Object[] = [
    {
        taskID: 1,
        taskName: 'Planning',
        startDate: new Date('02/03/2017'),
        endDate: new Date('02/07/2017'),
        progress: 100,
        duration: 5,
        priority: 'Normal',
        approved: false,
        isInExpandState: true,
        subtasks: [
            { taskID: 2, taskName: 'Plan timeline', startDate: new Date('02/03/2017'), endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Normal', approved: false },
            { taskID: 3, taskName: 'Plan budget', startDate: new Date('02/03/2017'), endDate: new Date('02/07/2017'), duration: 5, progress: 100, approved: true },
            { taskID: 4, taskName: 'Allocate resources', startDate: new Date('02/03/2017'), endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Critical', approved: false },
            { taskID: 5, taskName: 'Planning complete', startDate: new Date('02/07/2017'), endDate: new Date('02/07/2017'), duration: 0, progress: 0, priority: 'Low', approved: true }
        ]
    },
    {
        taskID: 6,
        taskName: 'Design',
        startDate: new Date('02/10/2017'),
        endDate: new Date('02/14/2017'),
        duration: 3,
        progress: 86,
        priority: 'High',
        isInExpandState: false,
        approved: false,
        subtasks: [
            { taskID: 7, taskName: 'Software Specification', startDate: new Date('02/10/2017'), endDate: new Date('02/12/2017'), duration: 3, progress: 60, priority: 'Normal', approved: false },
            { taskID: 8, taskName: 'Develop prototype', startDate: new Date('02/10/2017'), endDate: new Date('02/12/2017'), duration: 3, progress: 100, priority: 'Critical', approved: false },
            { taskID: 9, taskName: 'Get approval from customer', startDate: new Date('02/13/2017'), endDate: new Date('02/14/2017'), duration: 2, progress: 100, approved: true },
            { taskID: 10, taskName: 'Design Documentation', startDate: new Date('02/13/2017'), endDate: new Date('02/14/2017'), duration: 2, progress: 100, approved: true },
            { taskID: 11, taskName: 'Design complete', startDate: new Date('02/14/2017'), endDate: new Date('02/14/2017'), duration: 0, progress: 0, priority: 'Normal', approved: true }
        ]
    },
    {
        taskID: 12,
        taskName: 'Implementation Phase',
        startDate: new Date('02/17/2017'),
        endDate: new Date('02/27/2017'),
        priority: 'Normal',
        approved: false,
        duration: 11,
        subtasks: [
            {
                taskID: 13,
                taskName: 'Phase 1',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'High',
                approved: false,
                duration: 11,
                subtasks: [{
                    taskID: 14,
                    taskName: 'Implementation Module 1',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'Normal',
                    duration: 11,
                    approved: false,
                    subtasks: [
                        { taskID: 15, taskName: 'Development Task 1', startDate: new Date('02/17/2017'), endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'High', approved: false },
                        { taskID: 16, taskName: 'Development Task 2', startDate: new Date('02/17/2017'), endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 17, taskName: 'Testing', startDate: new Date('02/20/2017'), endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 18, taskName: 'Bug fix', startDate: new Date('02/24/2017'), endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'Critical', approved: false },
                        { taskID: 19, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'), endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 20, taskName: 'Phase 1 complete', startDate: new Date('02/27/2017'), endDate: new Date('02/27/2017'), duration: 0, priority: 'Low', approved: true }
                    ]
                }]
            },
            {
                taskID: 21,
                taskName: 'Phase 2',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/28/2017'),
                priority: 'High',
                approved: false,
                duration: 12,
                subtasks: [{
                    taskID: 22,
                    taskName: 'Implementation Module 2',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/28/2017'),
                    priority: 'Critical',
                    approved: false,
                    duration: 12,
                    subtasks: [
                        { taskID: 23, taskName: 'Development Task 1', startDate: new Date('02/17/2017'), endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Normal', approved: true },
                        { taskID: 24, taskName: 'Development Task 2', startDate: new Date('02/17/2017'), endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Critical', approved: true },
                        { taskID: 25, taskName: 'Testing', startDate: new Date('02/21/2017'), endDate: new Date('02/24/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 26, taskName: 'Bug fix', startDate: new Date('02/25/2017'), endDate: new Date('02/26/2017'), duration: 2, progress: '0', priority: 'Low', approved: false },
                        { taskID: 27, taskName: 'Customer review meeting', startDate: new Date('02/27/2017'), endDate: new Date('02/28/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 28, taskName: 'Phase 2 complete', startDate: new Date('02/28/2017'), endDate: new Date('02/28/2017'), duration: 0, priority: 'Normal', approved: false }
                    ]
                }]
            },
            {
                taskID: 29,
                taskName: 'Phase 3',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'Normal',
                approved: false,
                duration: 11,
                subtasks: [{
                    taskID: 30,
                    taskName: 'Implementation Module 3',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'High',
                    approved: false,
                    duration: 11,
                    subtasks: [
                        { taskID: 31, taskName: 'Development Task 1', startDate: new Date('02/17/2017'), endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 32, taskName: 'Development Task 2', startDate: new Date('02/17/2017'), endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Normal', approved: false },
                        { taskID: 33, taskName: 'Testing', startDate: new Date('02/20/2017'), endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 34, taskName: 'Bug fix', startDate: new Date('02/24/2017'), endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 35, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'), endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 36, taskName: 'Phase 3 complete', startDate: new Date('02/27/2017'), endDate: new Date('02/27/2017'), duration: 0, priority: 'Critical', approved: false },
                    ]
                }]
            }
        ]
    }
];

我希望获得一张递归处理数据的表，将子任务放在其父任务下，并在其父子任务下等子任务等等。

当前，我只能通过非动态标记钻一个级别。有很多例子说明这与无序列表一起使用，但是这些方法似乎也不适合表。在内部放置选择器标签会导致问题。

Answer 1

递归组件它仅制成一个

之类的组件

@Component({
  selector: 'recursive-component',
  template:`
  <ng-container>
  {{index}}--some template--, e.g {{item.title}}
  </ng-container>
     <ng-container *ngIf="item.children">
      <recursive-component *ngFor="let item of item.children" [index]="index+1" [item]="item">
      </recursive-component>
     <ng-container>  `
})
export class MenuComponent {
  @Input() item:any
  @Input() index:number=0;
}

我喜欢知道"递归水平"，这是该"索引"的原因。我们必须用来避免创建额外的HTML标签，并查看一下，以便我们必须用带孩子的对象为组件喂食。如果我们有一个数组，例如

items = [{ title: "item1" },
    {
      title: "item2", children: [
        { title: "item 2.1" },
        { title: "item 2.2" }]
    },
    { title: "item3" }
    ]

我们可以创建带有孩子的对象"飞"，我们的.html将为

<recursive-component [item]="{children:menu}"  ></recursive-component>

，但是您无法使用表，因为始终您将在另一个表格或另一个tr

内获取tr

如果您需要使用表，则可以采取另一个侵犯：在数据中生成一个基于数据的数组，以及是否扩展。因此，您可以执行

之类的函数

  getItems(data, items,index) {
    data.forEach(x => {
      if (!items)
        items=[];
      items.push(x);
      items[items.length-1].index=index
      if (x.subtasks && x.expanded)
        this.getItems(x.subtasks,items,index+1);
    }
    )
    return items;
  }

然后您可以简单

//In your .html
<table>
  <tr (click)="expanded(item)" *ngFor="let item of items">
    <td>{{item.taskID}}</td>
    <td>{{item.taskName}}</td>
  </tr>
  </table>
//And in your .ts
  ngOnInit()
  {
    this.items=this.getItems(this.sampleData,null,0)
  }
  expanded(item:any)
  {
    item.expanded=!item.expanded;
    this.items=this.getItems(this.sampleData,null,0)
  }

在Stackblitz中，您可以看到两个选项

注意：我简单使用Div（单击）或TR（单击）更改"扩展"属性。

Note2：在Stackblitz中，我使用"索引"来更改元素的边距或填充