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Backend API
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import React, { useCallback, useRef, useState } from 'react';import DropDownBox, { type DropDownBoxTypes } from 'devextreme-react/drop-down-box';import TreeView, { TreeViewRef } from 'devextreme-react/tree-view';import DataGrid, { Selection, Paging, FilterRow, Scrolling, type DataGridTypes,} from 'devextreme-react/data-grid';import CustomStore from 'devextreme/data/custom_store';import 'whatwg-fetch';const gridColumns = ['CompanyName', 'City', 'Phone'];const ownerLabel = { 'aria-label': 'Owner' };const makeAsyncDataSource = (jsonFile: string) => new CustomStore({ loadMode: 'raw', key: 'ID', load() { return fetch(`data/${jsonFile}`).then((response) => response.json()); }, });const treeDataSource = makeAsyncDataSource('treeProducts.json');const gridDataSource = makeAsyncDataSource('customers.json');function App() { const [treeBoxValue, setTreeBoxValue] = useState(['1_1']); const [gridBoxValue, setGridBoxValue] = useState([3]); const treeViewRef = useRef<TreeViewRef>(); const treeViewRender = useCallback( () => ( <TreeView dataSource={treeDataSource} ref={treeViewRef} dataStructure="plain" keyExpr="ID" parentIdExpr="categoryId" selectionMode="multiple" showCheckBoxesMode="normal" selectNodesRecursive={false} displayExpr="name" selectByClick={true} onContentReady={syncTreeViewSelection} onItemSelectionChanged={treeViewItemSelectionChanged} /> ), [treeDataSource], ); const dataGridRender = useCallback( () => ( <DataGrid height={345} dataSource={gridDataSource} columns={gridColumns} hoverStateEnabled={true} selectedRowKeys={gridBoxValue} onSelectionChanged={dataGridOnSelectionChanged} > <Selection mode="multiple" /> <Scrolling mode="virtual" /> <Paging enabled={true} pageSize={10} /> <FilterRow visible={true} /> </DataGrid> ), [gridDataSource, gridBoxValue], ); const syncTreeViewSelection = useCallback( (e: DropDownBoxTypes.ValueChangedEvent | any) => { const treeView = (e.component.selectItem && e.component) || (treeViewRef.current && treeViewRef.current.instance()); if (treeView) { if (e.value === null) { treeView.unselectAll(); } else { const values = e.value || treeBoxValue; values && values.forEach((value) => { treeView.selectItem(value); }); } } if (e.value !== undefined) { setTreeBoxValue(e.value); } }, [treeBoxValue], ); const syncDataGridSelection = useCallback((e: DropDownBoxTypes.ValueChangedEvent) => { setGridBoxValue(e.value || []); }, []); const treeViewItemSelectionChanged = useCallback( (e: { component: { getSelectedNodeKeys: () => any } }) => { setTreeBoxValue(e.component.getSelectedNodeKeys()); }, [], ); const dataGridOnSelectionChanged = useCallback((e: DataGridTypes.SelectionChangedEvent) => { setGridBoxValue((e.selectedRowKeys.length && e.selectedRowKeys) || []); }, []); return ( <div className="dx-fieldset"> <div className="dx-field"> <div className="dx-field-label">DropDownBox with embedded TreeView</div> <div className="dx-field-value"> <DropDownBox value={treeBoxValue} valueExpr="ID" inputAttr={ownerLabel} displayExpr="name" placeholder="Select a value..." showClearButton={true} dataSource={treeDataSource} onValueChanged={syncTreeViewSelection} contentRender={treeViewRender} /> </div> </div> <div className="dx-field"> <div className="dx-field-label">DropDownBox with embedded DataGrid</div> <div className="dx-field-value"> <DropDownBox value={gridBoxValue} valueExpr="ID" deferRendering={false} inputAttr={ownerLabel} displayExpr="CompanyName" placeholder="Select a value..." showClearButton={true} dataSource={gridDataSource} onValueChanged={syncDataGridSelection} contentRender={dataGridRender} /> </div> </div> </div> );}export default App;xxxxxxxxxximport React, { useCallback, useRef, useState } from 'react';import DropDownBox from 'devextreme-react/drop-down-box';import TreeView from 'devextreme-react/tree-view';import DataGrid, { Selection, Paging, FilterRow, Scrolling,} from 'devextreme-react/data-grid';import CustomStore from 'devextreme/data/custom_store';import 'whatwg-fetch';const gridColumns = ['CompanyName', 'City', 'Phone'];const ownerLabel = { 'aria-label': 'Owner' };const makeAsyncDataSource = (jsonFile) => new CustomStore({ loadMode: 'raw', key: 'ID', load() { return fetch(`data/${jsonFile}`).then((response) => response.json()); }, });const treeDataSource = makeAsyncDataSource('treeProducts.json');const gridDataSource = makeAsyncDataSource('customers.json');function App() { const [treeBoxValue, setTreeBoxValue] = useState(['1_1']); const [gridBoxValue, setGridBoxValue] = useState([3]); const treeViewRef = useRef(); const treeViewRender = useCallback( () => ( <TreeView dataSource={treeDataSource} ref={treeViewRef} dataStructure="plain" keyExpr="ID" parentIdExpr="categoryId" selectionMode="multiple" showCheckBoxesMode="normal" selectNodesRecursive={false} displayExpr="name" selectByClick={true} onContentReady={syncTreeViewSelection} onItemSelectionChanged={treeViewItemSelectionChanged} /> ), [treeDataSource], ); const dataGridRender = useCallback( () => ( <DataGrid height={345} dataSource={gridDataSource} columns={gridColumns} hoverStateEnabled={true} selectedRowKeys={gridBoxValue} onSelectionChanged={dataGridOnSelectionChanged} > <Selection mode="multiple" /> <Scrolling mode="virtual" /> <Paging enabled={true} pageSize={10} /> <FilterRow visible={true} /> </DataGrid> ), [gridDataSource, gridBoxValue], ); const syncTreeViewSelection = useCallback( (e) => { const treeView = (e.component.selectItem && e.component) || (treeViewRef.current && treeViewRef.current.instance()); if (treeView) { if (e.value === null) { treeView.unselectAll(); } else { const values = e.value || treeBoxValue; values && values.forEach((value) => { treeView.selectItem(value); }); } } if (e.value !== undefined) { setTreeBoxValue(e.value); } }, [treeBoxValue], ); const syncDataGridSelection = useCallback((e) => { setGridBoxValue(e.value || []); }, []); const treeViewItemSelectionChanged = useCallback((e) => { setTreeBoxValue(e.component.getSelectedNodeKeys()); }, []); const dataGridOnSelectionChanged = useCallback((e) => { setGridBoxValue((e.selectedRowKeys.length && e.selectedRowKeys) || []); }, []); return ( <div className="dx-fieldset"> <div className="dx-field"> <div className="dx-field-label">DropDownBox with embedded TreeView</div> <div className="dx-field-value"> <DropDownBox value={treeBoxValue} valueExpr="ID" inputAttr={ownerLabel} displayExpr="name" placeholder="Select a value..." showClearButton={true} dataSource={treeDataSource} onValueChanged={syncTreeViewSelection} contentRender={treeViewRender} /> </div> </div> <div className="dx-field"> <div className="dx-field-label">DropDownBox with embedded DataGrid</div> <div className="dx-field-value"> <DropDownBox value={gridBoxValue} valueExpr="ID" deferRendering={false} inputAttr={ownerLabel} displayExpr="CompanyName" placeholder="Select a value..." showClearButton={true} dataSource={gridDataSource} onValueChanged={syncDataGridSelection} contentRender={dataGridRender} /> </div> </div> </div> );}export default App;xxxxxxxxxximport React from 'react';import ReactDOM from 'react-dom';import App from './App.tsx';ReactDOM.render(<App />, document.getElementById('app'));xxxxxxxxxxwindow.exports = window.exports || {};window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, jsx: 'react', }, meta: { 'react': { 'esModule': true, }, 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, 'openai': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', 'bundles:': 'bundles/', 'externals:': 'bundles/externals/', }, defaultExtension: 'js', map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'react': 'npm:react@17.0.2/umd/react.development.js', 'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js', 'prop-types': 'npm:prop-types/prop-types.js', 'whatwg-fetch': 'npm:whatwg-fetch@2.0.4/fetch.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign', 'devextreme': 'npm:devextreme@24.2.6/cjs', 'devextreme-react': 'npm:devextreme-react@24.2.6/cjs', 'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.15/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.60/dist/dx-gantt.js', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12', '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/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', 'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', }, packages: { 'devextreme': { defaultExtension: 'js', }, 'devextreme-react': { main: 'index.js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/common/core/events/utils': { main: 'index', }, 'devextreme/localization/messages': { format: 'json', defaultExtension: 'json', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.12/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, react: true, },};System.config(window.config);xxxxxxxxxximport React from 'react';import ReactDOM from 'react-dom';import App from './App.js';ReactDOM.render(<App />, document.getElementById('app'));xxxxxxxxxx[{ "ID": 1, "CompanyName": "Premier Buy", "Address": "7601 Penn Avenue South", "City": "Richfield", "State": "Minnesota", "Zipcode": 55423, "Phone": "(612) 291-1000", "Fax": "(612) 291-2001", "Website": "http://www.nowebsitepremierbuy.dx"}, { "ID": 2, "CompanyName": "ElectrixMax", "Address": "263 Shuman Blvd", "City": "Naperville", "State": "Illinois", "Zipcode": 60563, "Phone": "(630) 438-7800", "Fax": "(630) 438-7801", "Website": "http://www.nowebsiteelectrixmax.dx"}, { "ID": 3, "CompanyName": "Video Emporium", "Address": "1201 Elm Street", "City": "Dallas", "State": "Texas", "Zipcode": 75270, "Phone": "(214) 854-3000", "Fax": "(214) 854-3001", "Website": "http://www.nowebsitevideoemporium.dx"}, { "ID": 4, "CompanyName": "Screen Shop", "Address": "1000 Lowes Blvd", "City": "Mooresville", "State": "North Carolina", "Zipcode": 28117, "Phone": "(800) 445-6937", "Fax": "(800) 445-6938", "Website": "http://www.nowebsitescreenshop.dx"}, { "ID": 5, "CompanyName": "Braeburn", "Address": "1 Infinite Loop", "City": "Cupertino", "State": "California", "Zipcode": 95014, "Phone": "(408) 996-1010", "Fax": "(408) 996-1012", "Website": "http://www.nowebsitebraeburn.dx"}, { "ID": 6, "CompanyName": "PriceCo", "Address": "30 Hunter Lane", "City": "Camp Hill", "State": "Pennsylvania", "Zipcode": 17011, "Phone": "(717) 761-2633", "Fax": "(717) 761-2334", "Website": "http://www.nowebsitepriceco.dx"}, { "ID": 7, "CompanyName": "Ultimate Gadget", "Address": "1557 Watson Blvd", "City": "Warner Robbins", "State": "Georgia", "Zipcode": 31093, "Phone": "(995) 623-6785", "Fax": "(995) 623-6786", "Website": "http://www.nowebsiteultimategadget.dx"}, { "ID": 8, "CompanyName": "EZ Stop", "Address": "618 Michillinda Ave.", "City": "Arcadia", "State": "California", "Zipcode": 91007, "Phone": "(626) 265-8632", "Fax": "(626) 265-8633", "Website": "http://www.nowebsiteezstop.dx"}, { "ID": 9, "CompanyName": "Clicker", "Address": "1100 W. Artesia Blvd.", "City": "Compton", "State": "California", "Zipcode": 90220, "Phone": "(310) 884-9000", "Fax": "(310) 884-9001", "Website": "http://www.nowebsiteclicker.dx"}, { "ID": 10, "CompanyName": "Store of America", "Address": "2401 Utah Ave. South", "City": "Seattle", "State": "Washington", "Zipcode": 98134, "Phone": "(206) 447-1575", "Fax": "(206) 447-1576", "Website": "http://www.nowebsiteamerica.dx"}, { "ID": 11, "CompanyName": "Zone Toys", "Address": "1945 S Cienega Boulevard", "City": "Los Angeles", "State": "California", "Zipcode": 90034, "Phone": "(310) 237-5642", "Fax": "(310) 237-5643", "Website": "http://www.nowebsitezonetoys.dx"}, { "ID": 12, "CompanyName": "ACME", "Address": "2525 E El Segundo Blvd", "City": "El Segundo", "State": "California", "Zipcode": 90245, "Phone": "(310) 536-0611", "Fax": "(310) 536-0612", "Website": "http://www.nowebsiteacme.dx"}]xxxxxxxxxx[ { "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", "price": 220 }, { "ID": "1_1_1_2", "categoryId": "1_1_1", "name": "SuperHD Video Player", "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", "price": 1200 }, { "ID": "1_1_2_2", "categoryId": "1_1_2", "name": "SuperLED 42", "price": 1450 }, { "ID": "1_1_2_3", "categoryId": "1_1_2", "name": "SuperLED 50", "price": 1600 }, { "ID": "1_1_2_4", "categoryId": "1_1_2", "name": "SuperLCD 55", "price": 1750 }, { "ID": "1_1_2_5", "categoryId": "1_1_2", "name": "SuperLCD 70", "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", "price": 160 }, { "ID": "1_1_4", "categoryId": "1_1", "name": "Projectors" }, { "ID": "1_1_4_1", "categoryId": "1_1_4", "name": "Projector Plus", "price": 550 }, { "ID": "1_1_4_2", "categoryId": "1_1_4", "name": "Projector PlusHD", "price": 750 }]xxxxxxxxxx<html lang="en"> <head></head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body></html>xxxxxxxxxx.dx-fieldset { height: 500px;}This demo uses the DataGrid's selection.mode and TreeView's selectionMode properties to enable multiple selection.