角度材料6 - 排序表

我在我的项目中使用Angular Material v6 .

我正在尝试添加一个表，我可以对数据进行排序 .

如果我正在使用Angular Material示例：https://material.angular.io/components/sort/overview

它工作正常：

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

  <!-- Position Column -->
  <ng-container matColumnDef="position">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> No. </th>
    <td mat-cell *matCellDef="let element"> {{element.position}} </td>
  </ng-container>

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

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

  <!-- Symbol Column -->
  <ng-container matColumnDef="symbol">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> 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>

和TS代码：

import {Component, OnInit, ViewChild} from '@angular/core';
import {MatSort, MatTableDataSource} from '@angular/material';

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

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


@Component({
  selector: 'table-sorting-example',
  styleUrls: ['table-sorting-example.css'],
  templateUrl: 'table-sorting-example.html',
})
export class TableSortingExample implements OnInit {
  displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
  dataSource = new MatTableDataSource(ELEMENT_DATA);

  @ViewChild(MatSort) sort: MatSort;

  ngOnInit() {
    this.dataSource.sort = this.sort;
  }
}

但如果我的数据是动态的并且使用* ngFor指令，我就无法对数据进行排序 . 我在这里创建一个非常简单的例子，我的数据是来自我的循环索引的数字：

<table mat-table [dataSource]="dataSource" matSort class="mat-elevation-z8" style="width: 70%;">

    <ng-container *ngFor="let column of displayedColumns; let i=index" [matColumnDef]="column">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> {{column}} </th>
        <td mat-cell *matCellDef="let element; let k=index"> {{k}} </td>
      </ng-container>

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

任何的想法 ？？