Добавьте ключ expanded в interface и установите его в true после нажатия:
Изменения в вашем классе компонентов:
import {Component} from '@angular/core';
import {animate, state, style, transition, trigger} from '@angular/animations';
/**
* @title Table with expandable rows
*/
@Component({
selector: 'table-expandable-rows-example',
styleUrls: ['table-expandable-rows-example.css'],
templateUrl: 'table-expandable-rows-example.html',
animations: [
trigger('detailExpand', [
state('collapsed', style({height: '0px', minHeight: '0', display: 'none'})),
state('expanded', style({height: '*'})),
transition('expanded <=> collapsed', animate('225ms cubic-bezier(0.4, 0.0, 0.2, 1)')),
]),
],
})
export class TableExpandableRowsExample {
dataSource = ELEMENT_DATA;
columnsToDisplay = ['name', 'weight', 'symbol', 'position'];
expandedElement: PeriodicElement;
}
export interface PeriodicElement {
name: string;
position: number;
weight: number;
symbol: string;
expanded: boolean;
description: string;
}
const ELEMENT_DATA: PeriodicElement[] = [
{
position: 1,
name: 'Hydrogen',
weight: 1.0079,
symbol: 'H',
expanded: false,
description: `Hydrogen is a chemical element with symbol H and atomic number 1. With a standard
atomic weight of 1.008, hydrogen is the lightest element on the periodic table.`
}, {
position: 2,
name: 'Helium',
weight: 4.0026,
symbol: 'He',
expanded: false,
description: `Helium is a chemical element with symbol He and atomic number 2. It is a
colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas
group in the periodic table. Its boiling point is the lowest among all the elements.`
}, {
position: 3,
name: 'Lithium',
weight: 6.941,
symbol: 'Li',
expanded: false,
description: `Lithium is a chemical element with symbol Li and atomic number 3. It is a soft,
silvery-white alkali metal. Under standard conditions, it is the lightest metal and the
lightest solid element.`
}, {
position: 4,
name: 'Beryllium',
weight: 9.0122,
symbol: 'Be',
expanded: false,
description: `Beryllium is a chemical element with symbol Be and atomic number 4. It is a
relatively rare element in the universe, usually occurring as a product of the spallation of
larger atomic nuclei that have collided with cosmic rays.`
}, {
position: 5,
name: 'Boron',
weight: 10.811,
symbol: 'B',
expanded: false,
description: `Boron is a chemical element with symbol B and atomic number 5. Produced entirely
by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a
low-abundance element in the Solar system and in the Earth's crust.`
}, {
position: 6,
name: 'Carbon',
weight: 12.0107,
symbol: 'C',
expanded: false,
description: `Carbon is a chemical element with symbol C and atomic number 6. It is nonmetallic
and tetravalent—making four electrons available to form covalent chemical bonds. It belongs
to group 14 of the periodic table.`
}, {
position: 7,
name: 'Nitrogen',
weight: 14.0067,
symbol: 'N',
expanded: false,
description: `Nitrogen is a chemical element with symbol N and atomic number 7. It was first
discovered and isolated by Scottish physician Daniel Rutherford in 1772.`
}, {
position: 8,
name: 'Oxygen',
weight: 15.9994,
symbol: 'O',
expanded: false,
description: `Oxygen is a chemical element with symbol O and atomic number 8. It is a member of
the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing
agent that readily forms oxides with most elements as well as with other compounds.`
}, {
position: 9,
name: 'Fluorine',
weight: 18.9984,
symbol: 'F',
expanded: false,
description: `Fluorine is a chemical element with symbol F and atomic number 9. It is the
lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard
conditions.`
}, {
position: 10,
name: 'Neon',
weight: 20.1797,
symbol: 'Ne',
expanded: false,
description: `Neon is a chemical element with symbol Ne and atomic number 10. It is a noble gas.
Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about
two-thirds the density of air.`
},
];
/** 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 */
Изменения в вашем шаблоне:
<table mat-table
[dataSource]="dataSource" multiTemplateDataRows
class="mat-elevation-z8">
<ng-container matColumnDef="{{column}}" *ngFor="let column of columnsToDisplay">
<th mat-header-cell *matHeaderCellDef> {{column}} </th>
<td mat-cell *matCellDef="let element"> {{element[column]}} </td>
</ng-container>
<!-- Expanded Content Column - The detail row is made up of this one column that spans across all columns -->
<ng-container matColumnDef="expandedDetail">
<td mat-cell *matCellDef="let element" [attr.colspan]="columnsToDisplay.length">
<div class="example-element-detail"
[@detailExpand]="element.expanded ? 'expanded' : 'collapsed'">
<div class="example-element-diagram">
<div class="example-element-position"> {{element.position}} </div>
<div class="example-element-symbol"> {{element.symbol}} </div>
<div class="example-element-name"> {{element.name}} </div>
<div class="example-element-weight"> {{element.weight}} </div>
</div>
<div class="example-element-description">
{{element.description}}
<span class="example-element-description-attribution"> -- Wikipedia </span>
</div>
</div>
</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="columnsToDisplay"></tr>
<tr mat-row *matRowDef="let element; columns: columnsToDisplay;"
class="example-element-row"
[class.example-expanded-row]="element.expanded"
(click)="element.expanded = true">
</tr>
<tr mat-row *matRowDef="let row; columns: ['expandedDetail']" class="example-detail-row"></tr>
</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 -->
Вот Рабочий образец StackBlitz для вашей ссылки.