Question

我有一个具有多个列和行的mat-table，其中对于其中一列，每个单元格包含一个字符串列表。我已经使用索引对列表项进行了编号，但随后的每一行中计数一直保持递增。例如

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1、2和3位于第1行，而4和5位于第2行

我想要的是从每一行开始的计数/索引，就像这样

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<ng-container matColumnDef='start'>
    <th mat-header-cell *matHeaderCellDef>Start</th>
    <td mat-cell *matCellDef='let row; let i = index;'>{{i+1}}:{{row.start}}</td>
</ng-container>

我要在该特定单元格/列中的每一行列表从1开始计数。

有什么想法吗？

Answer 1

根据您的问题：

mat-table具有多个列和行
对于其中一列，每个单元格包含一个字符串列表。
对于使用索引进行编号的列表项，但计数仅在随后的每一行中不断增加
您希望从每个特定单元格/列的计数重新开始，从1开始

相关的 HTML ：

<table mat-table [dataSource]="dataSource" class="mat-elevation-z8">

  <!--- Note that these columns can be defined in any order.
  The actual rendered columns are set as a property on the row definition" -->

  <ng-container matColumnDef="index">
    <th mat-header-cell *matHeaderCellDef> No. </th>
    <td mat-cell *matCellDef="let element; let j = index"> {{j+1}} </td>
  </ng-container>

  <!-- Position Column -->
  <ng-container matColumnDef="position">
    <th mat-header-cell *matHeaderCellDef> Position </th>
    <td mat-cell *matCellDef="let element; let j = index"> 
      <p *ngFor='let item of element.position;let i =index'>
        {{i+1}} - {{item}}
      </p>
    </td>
  </ng-container>

  <!-- Name Column -->
  <ng-container matColumnDef="name">
    <th mat-header-cell *matHeaderCellDef> Name </th>
    <td mat-cell *matCellDef="let element"> {{element.name}} </td>
  </ng-container>

  <!-- Weight Column -->
  <ng-container matColumnDef="weight">
    <th mat-header-cell *matHeaderCellDef> Weight </th>
    <td mat-cell *matCellDef="let element"> {{element.weight}} </td>
  </ng-container>

  <!-- Symbol Column -->
  <ng-container matColumnDef="symbol">
    <th mat-header-cell *matHeaderCellDef> Symbol </th>
    <td mat-cell *matCellDef="let element"> {{element.symbol}} </td>
  </ng-container>

  <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
  <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>

相关的 TS ：

import {Component} from '@angular/core';

export interface PeriodicElement {
  name: string;
  position: string[];
  weight: number;
  symbol: string;
}

const ELEMENT_DATA: PeriodicElement[] = [
  {position: ['stuff 1', 'some stuff', 'some more stuff'] , name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
  {position: ['things 2', 'some things', 'some more things'], name: 'Helium', weight: 4.0026, symbol: 'He'},
  {position: ['items 3', 'some items'], name: 'Lithium', weight: 6.941, symbol: 'Li'},
  {position: ['stuff 4', 'some stuff' ], name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
  {position: ['stuff 5', 'some stuff', 'some more stuff'], name: 'Boron', weight: 10.811, symbol: 'B'},
  {position: ['stuff 6', 'some stuff', 'some more stuff'], name: 'Carbon', weight: 12.0107, symbol: 'C'},
  {position: ['stuff 7', 'some stuff', 'some more stuff'], name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
  {position: ['stuff 8', 'some stuff', 'some more stuff'], name: 'Oxygen', weight: 15.9994, symbol: 'O'},
  {position: ['stuff 9', 'some stuff', 'some more stuff'], name: 'Fluorine', weight: 18.9984, symbol: 'F'},
  {position: ['stuff 10', 'some stuff', 'some more stuff'], name: 'Neon', weight: 20.1797, symbol: 'Ne'},
];

/**
 * @title Basic use of `<table mat-table>`
 */
@Component({
  selector: 'table-basic-example',
  styleUrls: ['table-basic-example.css'],
  templateUrl: 'table-basic-example.html',
})
export class TableBasicExample {
  displayedColumns: string[] = ['index', 'position', 'name', 'weight', 'symbol'];
  dataSource = ELEMENT_DATA;
}

完成working stackblitz here

角度：物料表重新启动表格单元格中列表的索引计数

1 个答案: