Node Selection and Customization

import { NgModule, Component, Pipe, PipeTransform, enableProdMode, ViewChild, } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxTreeViewModule, DxListModule, DxTemplateModule, DxCheckBoxModule, DxSelectBoxModule, DxTreeViewComponent, } from 'devextreme-angular'; import { Service, Employee } from './app.service'; @Pipe({ name: 'title' }) export class TitlePipe implements PipeTransform { transform(item: any): string { return item.text + (item.price ? ` ($${item.price})` : ''); } } if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], providers: [Service], preserveWhitespaces: true, }) export class AppComponent { @ViewChild(DxTreeViewComponent, { static: false }) treeView: DxTreeViewComponent; employees: Employee[]; selectedEmployees: Employee[] = []; showCheckBoxesModes: string[] = ['normal', 'selectAll', 'none']; showCheckBoxesMode: string = this.showCheckBoxesModes[0]; selectionModes: string[] = ['multiple', 'single']; selectionMode: string = this.selectionModes[0]; selectNodesRecursive = true; selectByClick = false; isRecursiveDisabled = false; isSelectionModeDisabled = false; constructor(service: Service) { this.employees = service.getEmployees(); } treeViewSelectionChanged(e) { this.syncSelection(e.component); } treeViewContentReady(e) { this.syncSelection(e.component); } syncSelection(treeView) { const selectedEmployees = treeView.getSelectedNodes() .map((node) => node.itemData); this.selectedEmployees = selectedEmployees; } showCheckBoxesModeValueChanged(e) { this.showCheckBoxesMode = e.value; this.isSelectionModeDisabled = e.value === 'selectAll'; if (e.value === 'selectAll') { this.selectionMode = 'multiple'; this.isRecursiveDisabled = false; } } selectionModeValueChanged(e) { this.selectionMode = e.value; this.isRecursiveDisabled = e.value === 'single'; if (e.value === 'single') { this.selectNodesRecursive = false; this.treeView.instance.unselectAll(); } } } @NgModule({ imports: [ BrowserModule, DxTreeViewModule, DxListModule, DxTemplateModule, DxCheckBoxModule, DxSelectBoxModule, ], declarations: [AppComponent, TitlePipe], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);

::ng-deep .form > h4 { margin-bottom: 20px; } ::ng-deep .form > div, ::ng-deep #treeview { display: inline-block; vertical-align: top; } ::ng-deep .selected-container { padding: 20px; margin-left: 20px; background-color: rgba(191, 191, 191, 0.15); font-size: 115%; font-weight: bold; } ::ng-deep #selected-employees { margin-top: 20px; } ::ng-deep .dx-list-item-content { padding-left: 0; } ::ng-deep .options { padding: 20px; background-color: rgba(191, 191, 191, 0.15); margin-top: 20px; } ::ng-deep .caption { font-size: 18px; font-weight: 500; } ::ng-deep .option { width: 24%; margin-top: 10px; margin-right: 9px; box-sizing: border-box; display: flex; flex-direction: column; justify-content: center; } ::ng-deep .options-container { display: flex; justify-content: space-between; align-items: stretch; } ::ng-deep .editor-container { height: 100%; display: flex; align-items: center; } ::ng-deep .editor-container > * { width: 100%; } ::ng-deep .option:last-of-type { margin-right: 0; }

import { Injectable } from '@angular/core'; export class Employee { id: number; fullName: string; prefix: string; position: string; expanded?: boolean; selected?: boolean; items?: Employee[]; } const employees: Employee[] = [{ id: 1, fullName: 'John Heart', prefix: 'Dr.', position: 'CEO', expanded: true, items: [{ id: 2, fullName: 'Samantha Bright', prefix: 'Dr.', position: 'COO', expanded: true, items: [{ id: 3, fullName: 'Kevin Carter', prefix: 'Mr.', position: 'Shipping Manager', }, { id: 14, fullName: 'Victor Norris', prefix: 'Mr.', selected: true, position: 'Shipping Assistant', }], }, { id: 4, fullName: 'Brett Wade', prefix: 'Mr.', position: 'IT Manager', expanded: true, items: [{ id: 5, fullName: 'Amelia Harper', prefix: 'Mrs.', position: 'Network Admin', }, { id: 6, fullName: 'Wally Hobbs', prefix: 'Mr.', position: 'Programmer', }, { id: 7, fullName: 'Brad Jameson', prefix: 'Mr.', position: 'Programmer', }, { id: 8, fullName: 'Violet Bailey', prefix: 'Ms.', position: 'Jr Graphic Designer', }], }, { id: 9, fullName: 'Barb Banks', prefix: 'Mrs.', position: 'Support Manager', expanded: true, items: [{ id: 10, fullName: 'Kelly Rodriguez', prefix: 'Ms.', position: 'Support Assistant', }, { id: 11, fullName: 'James Anderson', prefix: 'Mr.', position: 'Support Assistant', }], }], }]; @Injectable() export class Service { getEmployees(): Employee[] { return employees; } }

// 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@4.2.4/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', '@angular/core': 'npm:@angular/core@12.2.16', '@angular/platform-browser': 'npm:@angular/platform-browser@12.2.16', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.16', '@angular/forms': 'npm:@angular/forms@12.2.16', '@angular/common': 'npm:@angular/common@12.2.16', '@angular/compiler': 'npm:@angular/compiler@12.2.16', 'tslib': 'npm:tslib@2.3.1/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@1.28.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@22.1.3/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@22.1.3/bundles/dx.all.js', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.5.16/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.57', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.30', 'devextreme-angular': 'npm:devextreme-angular@22.1.3', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.7', 'inferno': 'npm:inferno@7.4.4/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat@7.4.11/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@7.4.11/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class@7.4.11/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras@7.4.11/dist/inferno-extras.min.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@3.0.7/inferno/package.json', 'npm:@angular/*/package.json', 'npm:@angular/common@12.2.16/*/package.json', 'npm:rxjs@7.5.3/package.json', 'npm:rxjs@7.5.3/operators/package.json', 'npm:devextreme-angular@22.1.3/*/package.json', 'npm:devextreme-angular@22.1.3/ui/*/package.json', 'npm:devextreme-angular@22.1.3/package.json', 'npm:devexpress-diagram@2.1.57/package.json', 'npm:devexpress-gantt@4.1.30/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/22.1.3/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.3/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>