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' }"
valueExpr="ID"
displayExpr="name"
placeholder="Select a value..."
[showClearButton]="true"
[dataSource]="treeDataSource"
(onValueChanged)="onDropDownBoxValueChanged()"
>
<div *dxTemplate="let data of 'content'">
<dx-tree-view
[dataSource]="treeDataSource"
dataStructure="plain"
keyExpr="ID"
parentIdExpr="categoryId"
selectionMode="multiple"
showCheckBoxesMode="normal"
[selectNodesRecursive]="false"
displayExpr="name"
[selectByClick]="true"
(onContentReady)="onTreeViewReady($event)"
(onItemSelectionChanged)="onTreeViewSelectionChanged($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"
[inputAttr]="{ 'aria-label': 'Owner' }"
valueExpr="ID"
displayExpr="CompanyName"
placeholder="Select a value..."
[showClearButton]="true"
[dataSource]="gridDataSource"
>
<div *dxTemplate="let data of 'content'">
<dx-data-grid
[dataSource]="gridDataSource"
[columns]="['CompanyName', 'City', 'Phone']"
[selection]="{ mode: 'multiple' }"
[hoverStateEnabled]="true"
[paging]="{ enabled: true, pageSize: 10 }"
[filterRow]="{ visible: true }"
[scrolling]="{ mode: 'virtual' }"
[height]="345"
[(selectedRowKeys)]="gridBoxValue"
>
</dx-data-grid>
</div>
</dx-drop-down-box>
</div>
</div>
</div>
import { bootstrapApplication } from '@angular/platform-browser';
import { enableProdMode, 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 { DxDropDownBoxModule, DxDataGridModule } from 'devextreme-angular';
import { DxTreeViewComponent, DxTreeViewModule, DxTreeViewTypes } from 'devextreme-angular/ui/tree-view';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css'],
imports: [
DxTreeViewModule,
DxDropDownBoxModule,
DxDataGridModule,
],
})
export class AppComponent {
@ViewChild(DxTreeViewComponent, { static: false }) treeView: DxTreeViewComponent;
treeDataSource: any;
gridDataSource: any;
treeBoxValue = ['1_1'];
gridBoxValue = [3];
constructor(http: HttpClient) {
this.treeDataSource = this.makeAsyncDataSource(http, 'treeProducts.json');
this.gridDataSource = this.makeAsyncDataSource(http, 'customers.json');
}
makeAsyncDataSource(http: HttpClient, jsonFile: string) {
return new CustomStore({
loadMode: 'raw',
key: 'ID',
load() {
return lastValueFrom(http.get(`../../../../data/${jsonFile}`));
},
});
}
onDropDownBoxValueChanged() {
this.updateSelection(this.treeView?.instance);
}
onTreeViewReady(e: DxTreeViewTypes.ContentReadyEvent) {
this.updateSelection(e.component);
}
updateSelection(treeView: DxTreeViewComponent['instance']) {
if (!treeView) return;
if (!this.treeBoxValue) {
treeView.unselectAll();
}
this.treeBoxValue?.forEach(((value) => {
treeView.selectItem(value);
}));
}
onTreeViewSelectionChanged(e: DxTreeViewTypes.ItemSelectionChangedEvent) {
this.treeBoxValue = e.component.getSelectedNodeKeys();
}
}
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
}
]
This demo uses the DataGrid's selection.mode and TreeView's selectionMode properties to enable multiple selection.