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Tree View

Plain Data Structure

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

Backend API
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<div class="form"> <dx-tree-view id="simple-treeview" [items]="products" dataStructure="plain" parentIdExpr="categoryId" keyExpr="ID" displayExpr="name" [width]="300" (onItemClick)="selectItem($event)" ></dx-tree-view> <div id="product-details" *ngIf="currentItem.price"> <img [src]="currentItem.icon" /> <div class="name">{{currentItem.name}}</div> <div class="price">{{"$" + 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 } 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; name: string; expanded?: boolean; categoryId?: string; icon?: string; price?: number; } var 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/ 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': 'npm:@angular', '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@21.1.6/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@21.1.6/bundles/dx.all.js', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.4.2/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.32', 'devexpress-gantt': 'npm:devexpress-gantt@3.0.14', 'devextreme-angular': 'npm:devextreme-angular@21.1.6', '@devextreme/vdom': 'npm:@devextreme/vdom@1.2.2', '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:@angular/*/package.json", "npm:@angular/common/*/package.json", "npm:rxjs/package.json", "npm:rxjs/operators/package.json", "npm:devextreme-angular/*/package.json", "npm:devextreme-angular/ui/*/package.json", "npm:devextreme-angular/package.json", "npm:devexpress-diagram/package.json", "npm:devexpress-gantt/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/21.1.6/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.1.6/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@0.10.3/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>