Backend API
<div class="dx-fieldset">
<div class="dx-field">
<div class="dx-field-label">DropDownBox with embedded TreeView</div>
<div class="dx-field-value">
<dx-drop-down-box
[(value)]="treeBoxValue"
[inputAttr]="{ 'aria-label': 'Owner' }"
[(opened)]="isTreeBoxOpened"
valueExpr="ID"
displayExpr="name"
placeholder="Select a value..."
[showClearButton]="true"
[dataSource]="treeDataSource"
(onValueChanged)="syncTreeViewSelection()"
>
<div *dxTemplate="let data of 'content'">
<dx-tree-view
[dataSource]="treeDataSource"
dataStructure="plain"
keyExpr="ID"
parentIdExpr="categoryId"
selectionMode="single"
displayExpr="name"
[selectByClick]="true"
(onContentReady)="$event.component.selectItem(treeBoxValue)"
(onItemSelectionChanged)="treeView_itemSelectionChanged($event)"
>
</dx-tree-view>
</div>
</dx-drop-down-box>
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">DropDownBox with embedded DataGrid</div>
<div class="dx-field-value">
<dx-drop-down-box
[(value)]="gridBoxValue"
[(opened)]="isGridBoxOpened"
valueExpr="ID"
[deferRendering]="false"
[displayExpr]="gridBox_displayExpr"
placeholder="Select a value..."
[inputAttr]="{ 'aria-label': 'Owner' }"
[showClearButton]="true"
[dataSource]="gridDataSource"
>
<div *dxTemplate="let data of 'content'">
<dx-data-grid
[dataSource]="gridDataSource"
[columns]="gridColumns"
[hoverStateEnabled]="true"
showBorders="true"
[selectedRowKeys]="gridBoxValue"
(onSelectionChanged)="dataGrid_selectionChanged($event)"
height="100%"
>
<dxo-data-grid-selection mode="single"></dxo-data-grid-selection>
<dxo-data-grid-filter-row
[visible]="true"
></dxo-data-grid-filter-row>
<dxo-data-grid-scrolling mode="virtual"></dxo-data-grid-scrolling>
<dxo-data-grid-paging
[enabled]="true"
[pageSize]="10"
></dxo-data-grid-paging>
</dx-data-grid>
</div>
</dx-drop-down-box>
</div>
</div>
</div>
import { bootstrapApplication } from '@angular/platform-browser';
import { enableProdMode, ChangeDetectionStrategy, ChangeDetectorRef, Component, ViewChild, provideZoneChangeDetection } from '@angular/core';
import { HttpClient, provideHttpClient, withFetch } from '@angular/common/http';
import { lastValueFrom } from 'rxjs';
import { CustomStore } from 'devextreme-angular/common/data';
import { DxDataGridModule } from 'devextreme-angular';
import { DxDataGridTypes } from 'devextreme-angular/ui/data-grid';
import { DxTreeViewModule, DxTreeViewComponent, DxTreeViewTypes } from 'devextreme-angular/ui/tree-view';
import { DxDropDownBoxModule } from 'devextreme-angular/ui/drop-down-box';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css'],
changeDetection: ChangeDetectionStrategy.OnPush,
imports: [
DxTreeViewModule,
DxDropDownBoxModule,
DxDataGridModule,
],
})
export class AppComponent {
@ViewChild(DxTreeViewComponent, { static: false }) treeView: DxTreeViewComponent;
treeDataSource: CustomStore;
gridDataSource: CustomStore;
isTreeBoxOpened = false;
isGridBoxOpened = false;
gridBoxValue = [3];
treeBoxValue: string | string[] = '1_1';
gridColumns = ['CompanyName', 'City', 'Phone'];
constructor(private httpClient: HttpClient, private ref: ChangeDetectorRef) {
this.treeDataSource = this.makeAsyncDataSource(this.httpClient, 'treeProducts.json');
this.gridDataSource = this.makeAsyncDataSource(this.httpClient, 'customers.json');
}
makeAsyncDataSource(http: HttpClient, jsonFile: string) {
return new CustomStore({
loadMode: 'raw',
key: 'ID',
load() {
return lastValueFrom(http.get(`../../../../data/${jsonFile}`));
},
});
}
syncTreeViewSelection() {
if (!this.treeView) return;
if (this.treeBoxValue) {
this.treeView.instance.selectItem(this.treeBoxValue);
} else {
this.treeView.instance.unselectAll();
}
this.isTreeBoxOpened = false;
this.ref.detectChanges();
}
treeView_itemSelectionChanged(e: DxTreeViewTypes.ItemSelectionChangedEvent) {
const selectedKeys = e.component.getSelectedNodeKeys();
this.treeBoxValue = selectedKeys.length > 0 ? selectedKeys[0] : null;
}
dataGrid_selectionChanged(e: DxDataGridTypes.SelectionChangedEvent) {
this.gridBoxValue = e.selectedRowKeys;
this.isGridBoxOpened = false;
this.ref.detectChanges();
}
gridBox_displayExpr = ({ CompanyName, Phone }) => CompanyName && `${CompanyName} <${Phone}>`;
}
bootstrapApplication(AppComponent, {
providers: [
provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }),
provideHttpClient(withFetch()),
],
});
:host .dx-fieldset {
height: 500px;
}
<!DOCTYPE html>
<html lang="en">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" />
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
<script src="https://cdn.jsdelivr.net/npm/zone.js@0.16.2/bundles/zone.umd.js"></script>
<script src="./bundle.js" type="module"></script>
</body>
</html>
[{
"ID": 1,
"CompanyName": "Premier Buy",
"Address": "7601 Penn Avenue South",
"City": "Richfield",
"State": "Minnesota",
"Zipcode": 55423,
"Phone": "(612) 291-1000",
"Fax": "(612) 291-2001",
"Website": "http://www.nowebsitepremierbuy.dx"
}, {
"ID": 2,
"CompanyName": "ElectrixMax",
"Address": "263 Shuman Blvd",
"City": "Naperville",
"State": "Illinois",
"Zipcode": 60563,
"Phone": "(630) 438-7800",
"Fax": "(630) 438-7801",
"Website": "http://www.nowebsiteelectrixmax.dx"
}, {
"ID": 3,
"CompanyName": "Video Emporium",
"Address": "1201 Elm Street",
"City": "Dallas",
"State": "Texas",
"Zipcode": 75270,
"Phone": "(214) 854-3000",
"Fax": "(214) 854-3001",
"Website": "http://www.nowebsitevideoemporium.dx"
}, {
"ID": 4,
"CompanyName": "Screen Shop",
"Address": "1000 Lowes Blvd",
"City": "Mooresville",
"State": "North Carolina",
"Zipcode": 28117,
"Phone": "(800) 445-6937",
"Fax": "(800) 445-6938",
"Website": "http://www.nowebsitescreenshop.dx"
}, {
"ID": 5,
"CompanyName": "Braeburn",
"Address": "1 Infinite Loop",
"City": "Cupertino",
"State": "California",
"Zipcode": 95014,
"Phone": "(408) 996-1010",
"Fax": "(408) 996-1012",
"Website": "http://www.nowebsitebraeburn.dx"
}, {
"ID": 6,
"CompanyName": "PriceCo",
"Address": "30 Hunter Lane",
"City": "Camp Hill",
"State": "Pennsylvania",
"Zipcode": 17011,
"Phone": "(717) 761-2633",
"Fax": "(717) 761-2334",
"Website": "http://www.nowebsitepriceco.dx"
}, {
"ID": 7,
"CompanyName": "Ultimate Gadget",
"Address": "1557 Watson Blvd",
"City": "Warner Robbins",
"State": "Georgia",
"Zipcode": 31093,
"Phone": "(995) 623-6785",
"Fax": "(995) 623-6786",
"Website": "http://www.nowebsiteultimategadget.dx"
}, {
"ID": 8,
"CompanyName": "EZ Stop",
"Address": "618 Michillinda Ave.",
"City": "Arcadia",
"State": "California",
"Zipcode": 91007,
"Phone": "(626) 265-8632",
"Fax": "(626) 265-8633",
"Website": "http://www.nowebsiteezstop.dx"
}, {
"ID": 9,
"CompanyName": "Clicker",
"Address": "1100 W. Artesia Blvd.",
"City": "Compton",
"State": "California",
"Zipcode": 90220,
"Phone": "(310) 884-9000",
"Fax": "(310) 884-9001",
"Website": "http://www.nowebsiteclicker.dx"
}, {
"ID": 10,
"CompanyName": "Store of America",
"Address": "2401 Utah Ave. South",
"City": "Seattle",
"State": "Washington",
"Zipcode": 98134,
"Phone": "(206) 447-1575",
"Fax": "(206) 447-1576",
"Website": "http://www.nowebsiteamerica.dx"
}, {
"ID": 11,
"CompanyName": "Zone Toys",
"Address": "1945 S Cienega Boulevard",
"City": "Los Angeles",
"State": "California",
"Zipcode": 90034,
"Phone": "(310) 237-5642",
"Fax": "(310) 237-5643",
"Website": "http://www.nowebsitezonetoys.dx"
}, {
"ID": 12,
"CompanyName": "ACME",
"Address": "2525 E El Segundo Blvd",
"City": "El Segundo",
"State": "California",
"Zipcode": 90245,
"Phone": "(310) 536-0611",
"Fax": "(310) 536-0612",
"Website": "http://www.nowebsiteacme.dx"
}]
[
{
"ID": 1,
"name": "Stores",
"expanded": true
},
{
"ID": "1_1",
"categoryId": 1,
"name": "Super Mart of the West",
"expanded": true
},
{
"ID": "1_1_1",
"categoryId": "1_1",
"name": "Video Players"
},
{
"ID": "1_1_1_1",
"categoryId": "1_1_1",
"name": "HD Video Player",
"price": 220
},
{
"ID": "1_1_1_2",
"categoryId": "1_1_1",
"name": "SuperHD Video Player",
"price": 270
},
{
"ID": "1_1_2",
"categoryId": "1_1",
"name": "Televisions",
"expanded": true
},
{
"ID": "1_1_2_1",
"categoryId": "1_1_2",
"name": "SuperLCD 42",
"price": 1200
},
{
"ID": "1_1_2_2",
"categoryId": "1_1_2",
"name": "SuperLED 42",
"price": 1450
},
{
"ID": "1_1_2_3",
"categoryId": "1_1_2",
"name": "SuperLED 50",
"price": 1600
},
{
"ID": "1_1_2_4",
"categoryId": "1_1_2",
"name": "SuperLCD 55",
"price": 1750
},
{
"ID": "1_1_2_5",
"categoryId": "1_1_2",
"name": "SuperLCD 70",
"price": 4000
},
{
"ID": "1_1_3",
"categoryId": "1_1",
"name": "Monitors"
},
{
"ID": "1_1_3_1",
"categoryId": "1_1_3",
"name": "19\""
},
{
"ID": "1_1_3_1_1",
"categoryId": "1_1_3_1",
"name": "DesktopLCD 19",
"price": 160
},
{
"ID": "1_1_4",
"categoryId": "1_1",
"name": "Projectors"
},
{
"ID": "1_1_4_1",
"categoryId": "1_1_4",
"name": "Projector Plus",
"price": 550
},
{
"ID": "1_1_4_2",
"categoryId": "1_1_4",
"name": "Projector PlusHD",
"price": 750
}
]
The following instructions show how to synchronize the DropDownBox with any other embedded DevExtreme component:
-
Specify data sources
The DropDownBox's and embedded component's data sources can be the same or different. If they are different, the embedded component's key field should be present in the DropDownBox's data source. -
Specify which data field provides the DropDownBox's values and the embedded component's keys
Assign the field's name to the DropDownBox's valueExpr property and to the key property of the embedded component's store. -
Synchronize the DropDownBox's value and the embedded component's selection
Bind the DropDownBox's value and the embedded component's selectedRowKeys/selectedItemKeys property to the same variable.