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Tree View

Hierarchical Data Structure

Use the following properties to bind the TreeView to hierarchical data:

  • items[]
    Assigns a local array as done in this demo.

  • dataSource
    Assigns a DataSource object that allows you to perform data shaping operations and use a remote source.

Each object in the TreeView's hierarchical data structure should include the following fields:

  • id
    Unique item identifier.

  • text
    Text displayed by the item.

  • items
    Nested objects (optional).

You can respectively use the keyExpr, displayExpr, and itemsExpr properties to specify custom names for the above-mentioned fields. Node objects can also include developer-defined fields and properties from this help section: items[].

In this demo, nodes use the expanded property, which specifies whether a node is collapsed or expanded. They also include the developer-defined price and image fields.

To get started with the DevExtreme TreeView component, refer to the following tutorial for step-by-step instructions: Getting Started with TreeView.

Backend API
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<div class="form"> <dx-tree-view id="simple-treeview" [items]="products" [width]="300" (onItemClick)="selectItem($event)" ></dx-tree-view> <div id="product-details" *ngIf="currentItem.price"> <img [src]="currentItem.image" /> <div class="name">{{ currentItem.text }}</div> <div class="price">{{ "$" + currentItem.price }}</div> </div> </div>
import { NgModule, Component, enableProdMode } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxTreeViewModule } from 'devextreme-angular'; import { Product, Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], providers: [Service], }) export class AppComponent { products: Product[]; currentItem: Product; constructor(service: Service) { this.products = service.getProducts(); this.currentItem = this.products[0]; } selectItem(e) { this.currentItem = e.itemData; } } @NgModule({ imports: [ BrowserModule, DxTreeViewModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #simple-treeview, #product-details { display: inline-block; } ::ng-deep #product-details { vertical-align: top; width: 400px; height: 420px; margin-left: 20px; } ::ng-deep #product-details > img { border: none; height: 300px; width: 400px; } ::ng-deep #product-details > .name { text-align: center; font-size: 20px; } ::ng-deep #product-details > .price { text-align: center; font-size: 24px; } ::ng-deep .dark #product-details > div { color: #f0f0f0; } ::ng-deep .hidden { visibility: hidden; }
import { Injectable } from '@angular/core'; export class Product { id: string; text: string; expanded?: boolean; items?: Product[]; price?: number; image?: string; } const products: Product[] = [{ id: '1', text: 'Stores', expanded: true, items: [{ id: '1_1', text: 'Super Mart of the West', expanded: true, items: [{ id: '1_1_1', text: 'Video Players', items: [{ id: '1_1_1_1', text: 'HD Video Player', price: 220, image: '../../../../images/products/1.png', }, { id: '1_1_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 270, }], }, { id: '1_1_2', text: 'Televisions', expanded: true, items: [{ id: '1_1_2_1', text: 'SuperLCD 42', image: '../../../../images/products/7.png', price: 1200, }, { id: '1_1_2_2', text: 'SuperLED 42', image: '../../../../images/products/5.png', price: 1450, }, { id: '1_1_2_3', text: 'SuperLED 50', image: '../../../../images/products/4.png', price: 1600, }, { id: '1_1_2_4', text: 'SuperLCD 55', image: '../../../../images/products/6.png', price: 1350, }, { id: '1_1_2_5', text: 'SuperLCD 70', image: '../../../../images/products/9.png', price: 4000, }], }, { id: '1_1_3', text: 'Monitors', expanded: true, items: [{ id: '1_1_3_1', text: '19"', expanded: true, items: [{ id: '1_1_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 160, }], }, { id: '1_1_3_2', text: '21"', items: [{ id: '1_1_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 170, }, { id: '1_1_3_2_2', text: 'DesktopLED 21', image: '../../../../images/products/13.png', price: 175, }], }], }, { id: '1_1_4', text: 'Projectors', items: [{ id: '1_1_4_1', text: 'Projector Plus', image: '../../../../images/products/14.png', price: 550, }, { id: '1_1_4_2', text: 'Projector PlusHD', image: '../../../../images/products/15.png', price: 750, }], }], }, { id: '1_2', text: 'Braeburn', items: [{ id: '1_2_1', text: 'Video Players', items: [{ id: '1_2_1_1', text: 'HD Video Player', image: '../../../../images/products/1.png', price: 240, }, { id: '1_2_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 300, }], }, { id: '1_2_2', text: 'Televisions', items: [{ id: '1_2_2_1', text: 'SuperPlasma 50', image: '../../../../images/products/3.png', price: 1800, }, { id: '1_2_2_2', text: 'SuperPlasma 65', image: '../../../../images/products/8.png', price: 3500, }], }, { id: '1_2_3', text: 'Monitors', items: [{ id: '1_2_3_1', text: '19"', items: [{ id: '1_2_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 170, }], }, { id: '1_2_3_2', text: '21"', items: [{ id: '1_2_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 180, }, { id: '1_2_3_2_2', text: 'DesktopLED 21', image: '../../../../images/products/13.png', price: 190, }], }], }], }, { id: '1_3', text: 'E-Mart', items: [{ id: '1_3_1', text: 'Video Players', items: [{ id: '1_3_1_1', text: 'HD Video Player', image: '../../../../images/products/1.png', price: 220, }, { id: '1_3_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 275, }], }, { id: '1_3_3', text: 'Monitors', items: [{ id: '1_3_3_1', text: '19"', items: [{ id: '1_3_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 165, }], }, { id: '1_3_3_2', text: '21"', items: [{ id: '1_3_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 175, }], }], }], }, { id: '1_4', text: 'Walters', items: [{ id: '1_4_1', text: 'Video Players', items: [{ id: '1_4_1_1', text: 'HD Video Player', image: '../../../../images/products/1.png', price: 210, }, { id: '1_4_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 250, }], }, { id: '1_4_2', text: 'Televisions', items: [{ id: '1_4_2_1', text: 'SuperLCD 42', image: '../../../../images/products/7.png', price: 1100, }, { id: '1_4_2_2', text: 'SuperLED 42', image: '../../../../images/products/5.png', price: 1400, }, { id: '1_4_2_3', text: 'SuperLED 50', image: '../../../../images/products/4.png', price: 1500, }, { id: '1_4_2_4', text: 'SuperLCD 55', image: '../../../../images/products/6.png', price: 1300, }, { id: '1_4_2_5', text: 'SuperLCD 70', image: '../../../../images/products/9.png', price: 4000, }, { id: '1_4_2_6', text: 'SuperPlasma 50', image: '../../../../images/products/3.png', price: 1700, }], }, { id: '1_4_3', text: 'Monitors', items: [{ id: '1_4_3_1', text: '19"', items: [{ id: '1_4_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 160, }], }, { id: '1_4_3_2', text: '21"', items: [{ id: '1_4_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 170, }, { id: '1_4_3_2_2', text: 'DesktopLED 21', image: '../../../../images/products/13.png', price: 180, }], }], }, { id: '1_4_4', text: 'Projectors', items: [{ id: '1_4_4_1', text: 'Projector Plus', image: '../../../../images/products/14.png', price: 550, }, { id: '1_4_4_2', text: 'Projector PlusHD', image: '../../../../images/products/15.png', price: 750, }], }], }], }]; @Injectable() export class Service { getProducts(): Product[] { return products; } }
// In real applications, you should not transpile code in the browser. // You can see how to create your own application with Angular and DevExtreme here: // https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/ window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/localization.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@3.5.3/lib/typescript.js', '@angular/core': 'npm:@angular/core@12.2.13', '@angular/platform-browser': 'npm:@angular/platform-browser@12.2.13', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.13', '@angular/forms': 'npm:@angular/forms@12.2.13', '@angular/common/http': 'npm:@angular/common@12.2.13/bundles/common-http.umd.js', '@angular/common': 'npm:@angular/common@12.2.13', '@angular/compiler': 'npm:@angular/compiler@12.2.13', 'tslib': 'npm:tslib@2.3.1/tslib.js', 'rxjs': 'npm:rxjs@6.4.0', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@21.2.3/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@21.2.3/bundles/dx.all.js', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.5.5/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.37', 'devexpress-gantt': 'npm:devexpress-gantt@3.1.24', 'devextreme-angular': 'npm:devextreme-angular@21.2.3', '@devextreme/vdom': 'npm:@devextreme/vdom@2.2.3', '@devextreme/runtime': 'npm:@devextreme/runtime@2.3.8', 'inferno': 'npm:inferno@7.4.10/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat@7.4.10/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.10/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom@1.0.7/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.10/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.10/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class@7.4.10/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras@7.4.10/dist/inferno-extras.min.js', }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts', }, 'devextreme': { defaultExtension: 'js', }, '@devextreme/vdom': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@2.3.8/inferno/package.json', 'npm:@angular/*/package.json', 'npm:@angular/common/*/package.json', 'npm:rxjs@6.4.0/package.json', 'npm:rxjs@6.4.0/operators/package.json', 'npm:devextreme-angular/*/package.json', 'npm:devextreme-angular@21.2.3/ui/*/package.json', 'npm:devextreme-angular@21.2.3/package.json', 'npm:devexpress-diagram@2.1.37/package.json', 'npm:devexpress-gantt@3.1.24/package.json', ], }; System.config(window.config);
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <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=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.3/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.3/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.11.4/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script src="config.js"></script> <script> System.import("app").catch(console.error.bind(console)); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> </body> </html>