Angular DataGrid - Master-Detail Interface
User Interaction
The master-detail interface supplies a standard data row with an expandable section that contains detail data. In master-detail terms, the data row is called "master row" and the expandable section - "detail section".
The master-detail interface becomes available after you specify the detail sections' contents using the masterDetail.template property. You can expand and collapse detail sections programmatically or enable a user to do it by setting the masterDetail.enabled property to true. Set the masterDetail.autoExpandAll property to true to expand these sections by default.
- <dx-data-grid ... >
- <dxo-master-detail
- [enabled]="true"
- [autoExpandAll]="true"
- [template]="'detail'">
- </dxo-master-detail>
- <div *dxTemplate="let employee of 'detail'">
- <div class="employeeInfo">
- <img class="employeePhoto" [src]="employee.data.Picture" />
- <p class="employeeNotes">{{employee.data.Notes}}</p>
- </div>
- </div>
- </dx-data-grid>
- import { DxDataGridModule } from "devextreme-angular";
- // ...
- export class AppComponent {
- // ...
- }
- @NgModule({
- imports: [
- // ...
- DxDataGridModule
- ],
- // ...
- })
Once loaded, a detail section's content remains cached until a user switches to another page in the DataGrid or reloads the web page.
API
Pass -1 to the expandAll(groupIndex) or collapseAll(groupIndex) method to expand or collapse all master rows at once.
- import { ..., ViewChild } from "@angular/core";
- import { DxDataGridModule, DxDataGridComponent } from "devextreme-angular";
- // ...
- export class AppComponent {
- @ViewChild(DxDataGridComponent, { static: false }) dataGrid: DxDataGridComponent;
- // Prior to Angular 8
- // @ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
- expandAllMasterRows () {
- this.dataGrid.instance.expandAll(-1);
- }
- collapseAllMasterRows () {
- this.dataGrid.instance.collapseAll(-1);
- }
- }
- @NgModule({
- imports: [
- // ...
- DxDataGridModule
- ],
- // ...
- })
The expandRow(key) and collapseRow(key) methods expand and collapse an individual master row. You can check a row's current state by calling the isRowExpanded(key) method.
- import { ..., ViewChild } from "@angular/core";
- import { DxDataGridModule, DxDataGridComponent } from "devextreme-angular";
- // ...
- export class AppComponent {
- @ViewChild(DxDataGridComponent, { static: false }) dataGrid: DxDataGridComponent;
- // Prior to Angular 8
- // @ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
- toggleMasterRow (rowKey) {
- if (this.dataGrid.instance.isRowExpanded(rowKey)) {
- this.dataGrid.instance.collapseRow(rowKey);
- } else {
- this.dataGrid.instance.expandRow(rowKey);
- }
- }
- }
- @NgModule({
- imports: [
- // ...
- DxDataGridModule
- ],
- // ...
- })
Events
Events raised for a master row when a user expands or collapses it are identical to the events raised for expanding or collapsing a group. See this topic for details.
If you have technical questions, please create a support ticket in the DevExpress Support Center.