一个非常简单的答案是按照GroupID进行排序，这样可以将这些行分组在一起。然而，我猜你想在每个组之前显示一个标题行。
你可以提供一个替代的
<mat-row *matRowDef="..."，它使用了一个where子句。这可以用来显示一个非默认的列集合。where子句接受一个函数，如果该matRowDef应该被使用，则返回true。
然后，您提供给表格的数据将是数据行和组行交错排列，而函数则告诉我们哪个是哪个。以
基本使用<table mat-table>为起点，手动添加组并将where子句函数添加到app/table-basic-example.ts中。
import {Component} from '@angular/core';
export interface PeriodicElement {
name: string;
position: number;
weight: number;
symbol: string;
}
export interface Group {
group: string;
}
const ELEMENT_DATA: (PeriodicElement | Group)[] = [
{group: "Group 1"},
{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'},
{group: "Group 2"},
{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'},
{group: "Group 3"},
{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-basic-example',
styleUrls: ['table-basic-example.css'],
templateUrl: 'table-basic-example.html',
})
export class TableBasicExample {
displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
dataSource = ELEMENT_DATA;
isGroup(index, item): boolean{
return item.group;
}
}
并在app/table-basic-example.html中添加groupHeader列和额外的matRowDef。
<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" -->
<!-- Position Column -->
<ng-container matColumnDef="position">
<mat-header-cell *matHeaderCellDef> No. </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>
</ng-container>
<!-- Weight Column -->
<ng-container matColumnDef="weight">
<mat-header-cell *matHeaderCellDef> Weight </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>
</ng-container>
<!-- Symbol Column -->
<ng-container matColumnDef="symbol">
<mat-header-cell *matHeaderCellDef> Symbol </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>
</ng-container>
<ng-container matColumnDef="groupHeader">
<mat-cell *matCellDef="let group">{{group.group}}</mat-cell>
</ng-container>
<mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row *matRowDef="let row; columns: displayedColumns"></mat-row>
<mat-row *matRowDef="let row; columns: ['groupHeader']; when: isGroup"> </mat-row>
</mat-table>
<!-- Copyright 2018 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license -->
这里是一个已完成的
stackblitz，它按元素的首字母进行分组。
这是一个更完善的
stackblitz，只需提供要按列进行分组的列表，它将为您插入分组行。您还可以点击分组行来展开或折叠它们。
最后，这是一个
Github项目，它修改了从material代码库中复制的MatTableDataSource类。与过滤和排序很好地配合使用，但与分页器'竞争'，因为它们以不同的方式限制记录的视图。
