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Tree View

Item Selection and Customization

Documentation
The TreeView widget supports multi-selection. In this demo, the showCheckBoxesMode option is set to "normal" allowing multiple items to be marked as selected. In addition, a custom item template is utilized to display price per item in brackets.
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<div class="form"> <h4>Store: Super Mart of the West</h4> <dx-tree-view id="selection-treeview" [items]="products" [width]="320" showCheckBoxesMode="normal" (onItemSelectionChanged)="selectionChanged($event)" > <div *dxTemplate="let data of 'item'"> {{data | title}} </div> </dx-tree-view> <div> Selected Products <dx-list id="checked-items" [width]="400" [items]="checkedItems"> <dxi-item *ngFor="let item of checkedItems"> {{item.text + " (" + item.category + ") - $" + item.itemData.price}} </dxi-item> </dx-list> </div> </div>
import { NgModule, Component, Pipe, PipeTransform } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxTreeViewModule, DxListModule, DxTemplateModule } from 'devextreme-angular'; import { Product, Service } from './app.service'; @Pipe({ name: 'title' }) export class TitlePipe implements PipeTransform { transform(value: any): string { return value.text + (value.price ? ' ($' + value.price + ')' : ''); } } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], providers: [Service] }) export class AppComponent { products: Product[]; checkedItems: Product[] = []; constructor(service: Service) { this.products = service.getProducts(); } selectionChanged(e) { let value = e.node; if (this.isProduct(value)) { this.processProduct({ key: value.key, text: value.text, itemData: value.itemData, selected: value.selected, category: value.parent.text }); } else { value.items.forEach((product, index) => { this.processProduct({ key: product.key, text: product.text, itemData: product.itemData, selected: product.selected, category: value.text }); }); } } isProduct(data) { return !data.items.length; } processProduct(product) { let itemIndex = -1; this.checkedItems.forEach((item, index) => { if (item.key === product.key) { itemIndex = index; return false; } }); if (product.selected && itemIndex === -1) { this.checkedItems.push(product); } else if (!product.selected) { this.checkedItems.splice(itemIndex, 1); } } } @NgModule({ imports: [ BrowserModule, DxTreeViewModule, DxListModule, DxTemplateModule ], declarations: [AppComponent, TitlePipe], bootstrap: [AppComponent] }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
/deep/ .form > h4 { margin-bottom: 20px; } /deep/ .form > div, #selection-treeview { display: inline-block; vertical-align: top; } /deep/ #checked-items { margin-top: 20px; }
import { Injectable } from '@angular/core'; export class Product { id: string; text: string; expanded?: boolean; price?: number; items?: Product[]; } var products: Product[] = [{ id: "1_1_1", text: "Video Players", items: [{ id: "1_1_1_1", text: "HD Video Player", price: 220 }, { id: "1_1_1_2", text: "SuperHD Video Player", price: 270 }] }, { id: "1_1_2", text: "Televisions", expanded: true, items: [{ id: "1_1_2_1", text: "SuperLCD 42", price: 1200 }, { id: "1_1_2_2", text: "SuperLED 42", price: 1450 }, { id: "1_1_2_3", text: "SuperLED 50", price: 1600 }, { id: "1_1_2_4", text: "SuperLCD 55", price: 1350 }, { id: "1_1_2_5", text: "SuperLCD 70", price: 4000 }] }, { id: "1_1_4", text: "Projectors", items: [{ id: "1_1_4_1", text: "Projector Plus", price: 550 }, { id: "1_1_4_2", text: "Projector PlusHD", 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 2 and DevExtreme here: // https://github.com/DevExpress/devextreme-angular/blob/master/README.md System.config({ transpiler: 'ts', typescriptOptions: { module: "commonjs", emitDecoratorMetadata: true, experimentalDecorators: true }, meta: { 'typescript': { "exports": "ts" } }, paths: { 'npm:': 'https://unpkg.com/' }, map: { 'ts': 'npm:plugin-typescript@4.0.10/lib/plugin.js', 'typescript': 'npm:typescript@2.0.6/lib/typescript.js', '@angular/core': 'npm:@angular/core@2.4.3/bundles/core.umd.js', '@angular/common': 'npm:@angular/common@2.4.3/bundles/common.umd.js', '@angular/compiler': 'npm:@angular/compiler@2.4.3/bundles/compiler.umd.js', '@angular/platform-browser': 'npm:@angular/platform-browser@2.4.3/bundles/platform-browser.umd.js', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@2.4.3/bundles/platform-browser-dynamic.umd.js', '@angular/http': 'npm:@angular/http@2.4.3/bundles/http.umd.js', '@angular/router': 'npm:@angular/router@3.4.3/bundles/router.umd.js', '@angular/forms': 'npm:@angular/forms@2.4.3/bundles/forms.umd.js', 'rxjs': 'npm:rxjs@5.0.3', 'devextreme': 'npm:devextreme@16.2', 'jquery': 'npm:jquery@3.1.1/dist/jquery.min.js', 'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js', 'devextreme-angular': 'npm:devextreme-angular@16.2' }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts' }, 'devextreme': { defaultExtension: 'js' }, 'devextreme-angular': { main: 'index.js', defaultExtension: 'js' } } });
<!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/16.2.6/css/dx.spa.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/16.2.6/css/dx.common.css" /> <link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/16.2.6/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@0.6.25/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.19.31/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>