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Plain Data Structure

The TreeView's plain (one-dimensional) array contains items each of which references its parent item.

Backend API
<div class="form"> <dx-tree-view id="simple-treeview" [items]="products" dataStructure="plain" parentIdExpr="categoryId" keyExpr="ID" displayExpr="name" [width]="300" (onItemClick)="selectItem($event)" ></dx-tree-view> <div id="product-details" *ngIf="currentItem.price"> <img alt="{{ currentItem.name }}" [src]="currentItem.icon" /> <div class="name">{{ currentItem.name }}</div> <div class="price">{{ "$" + 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, DxTreeViewTypes } from 'devextreme-angular/ui/tree-view'; 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: DxTreeViewTypes.ItemClickEvent) { this.currentItem = e.itemData as Product; } } @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; name: string; expanded?: boolean; categoryId?: string; icon?: string; price?: number; } const products: Product[] = [ { 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', icon: '../../../../images/products/1.png', price: 220, }, { ID: '1_1_1_2', categoryId: '1_1_1', name: 'SuperHD Video Player', icon: '../../../../images/products/2.png', 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', icon: '../../../../images/products/7.png', price: 1200, }, { ID: '1_1_2_2', categoryId: '1_1_2', name: 'SuperLED 42', icon: '../../../../images/products/5.png', price: 1450, }, { ID: '1_1_2_3', categoryId: '1_1_2', name: 'SuperLED 50', icon: '../../../../images/products/4.png', price: 1600, }, { ID: '1_1_2_4', categoryId: '1_1_2', name: 'SuperLCD 55', icon: '../../../../images/products/6.png', price: 1750, }, { ID: '1_1_2_5', categoryId: '1_1_2', name: 'SuperLCD 70', icon: '../../../../images/products/9.png', 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', icon: '../../../../images/products/10.png', price: 160, }, { ID: '1_1_4', categoryId: '1_1', name: 'Projectors', }, { ID: '1_1_4_1', categoryId: '1_1_4', name: 'Projector Plus', icon: '../../../../images/products/14.png', price: 550, }, { ID: '1_1_4_2', categoryId: '1_1_4', name: 'Projector PlusHD', icon: '../../../../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/ const componentNames = [ 'accordion', 'action-sheet', 'autocomplete', 'bar-gauge', 'box', 'bullet', 'button-group', 'button', 'calendar', 'chart', 'check-box', 'circular-gauge', 'color-box', 'context-menu', 'data-grid', 'date-box', 'date-range-box', 'defer-rendering', 'diagram', 'draggable', 'drawer', 'drop-down-box', 'drop-down-button', 'file-manager', 'file-uploader', 'filter-builder', 'form', 'funnel', 'gallery', 'gantt', 'html-editor', 'linear-gauge', 'list', 'load-indicator', 'load-panel', 'lookup', 'map', 'menu', 'multi-view', 'nested', 'number-box', 'pie-chart', 'pivot-grid-field-chooser', 'pivot-grid', 'polar-chart', 'popover', 'popup', 'progress-bar', 'radio-group', 'range-selector', 'range-slider', 'recurrence-editor', 'resizable', 'responsive-box', 'sankey', 'scheduler', 'scroll-view', 'select-box', 'slider', 'sortable', 'sparkline', 'speed-dial-action', 'splitter', 'switch', 'tab-panel', 'tabs', 'tag-box', 'text-area', 'text-box', 'tile-view', 'toast', 'toolbar', 'tooltip', 'tree-list', 'tree-map', 'tree-view', 'validation-group', 'validation-summary', 'validator', 'vector-map', ]; window.exports = window.exports || {}; window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, '@angular/platform-browser-dynamic': { 'esModule': true, }, '@angular/platform-browser': { 'esModule': true, }, '@angular/core': { 'esModule': true, }, '@angular/common': { 'esModule': true, }, '@angular/animations': { 'esModule': true, }, '@angular/forms': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', 'bundles:': '../../../../bundles/', }, map: { 'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', /* @angular */ '@angular/compiler': 'bundles:@angular/compiler.umd.js', '@angular/platform-browser-dynamic': 'bundles:@angular/platform-browser-dynamic.umd.js', '@angular/core': 'bundles:@angular/core.umd.js', '@angular/core/primitives/signals': 'bundles:@angular/core.primitives.signals.umd.js', '@angular/common': 'bundles:@angular/common.umd.js', '@angular/common/http': 'bundles:@angular/common-http.umd.js', '@angular/platform-browser': 'bundles:@angular/platform-browser.umd.js', '@angular/platform-browser/animations': 'bundles:@angular/platform-browser.umd.js', '@angular/forms': 'bundles:@angular/forms.umd.js', /* devextreme */ 'devextreme': 'npm:devextreme@24.1.3/cjs', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13', 'devextreme/bundles/dx.all': 'npm:devextreme@24.1.3/bundles/dx.all.js', 'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.8', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.56', /* devextreme-angular umd maps */ 'devextreme-angular': 'bundles:devextreme-angular/devextreme-angular.umd.js', 'devextreme-angular/core': 'bundles:devextreme-angular/devextreme-angular-core.umd.js', ...componentNames.reduce((acc, name) => { acc[`devextreme-angular/ui/${name}`] = `bundles:devextreme-angular/devextreme-angular-ui-${name}.umd.js`; return acc; }, {}), 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'tslib': 'npm:tslib@2.6.1/tslib.js', 'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js', 'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts', }, 'devextreme': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, 'rxjs': { defaultExtension: 'js', }, 'rxjs/operators': { defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.13/inferno/package.json', 'npm:rxjs@7.5.3/package.json', 'npm:rxjs@7.5.3/operators/package.json', 'npm:devexpress-diagram@2.2.8/package.json', 'npm:devexpress-gantt@4.1.56/package.json', ], }; System.config(window.config); // System.import('@angular/compiler').catch(console.error.bind(console));
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" 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/24.1.3/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.13.0/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.13/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>

Use either of the following properties to bind the component to plain data:

  • items[]
    Assigns a local array as shown 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 plain data structure should include the following fields:

  • id
    Unique item identifier.

  • parentId
    Identifier of the parent item.

  • text
    Text displayed by the item.

You can respectively use the keyExpr, parentIdExpr, and displayExpr 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 icon and expanded properties. These properties specify the icon and whether a node is collapsed or expanded. Some nodes also include the developer-defined price field.