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Drop Down Box

Single Selection

The DropDownBox component is an editor that consists of a text field and drop-down content. In this demo, the content is the TreeView and the DataGrid in the single selection mode.

The following instructions show how to synchronize the DropDownBox with any other embedded DevExtreme component:

  1. Specify data sources
    The DropDownBox's and embedded component's data sources can be the same or different. If they are different, the embedded component's key field should be present in the DropDownBox's data source.

  2. Specify which data field provides the DropDownBox's values and the embedded component's keys
    Assign the field's name to the DropDownBox's valueExpr property and to the key property of the embedded component's store.

  3. Synchronize the DropDownBox's value and the embedded component's selection
    Bind the DropDownBox's value and the embedded component's selectedRowKeys/selectedItemKeys property to the same variable.

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import React 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']; class App extends React.Component { constructor(props) { super(props); this.treeView = null; this.treeDataSource = this.makeAsyncDataSource('treeProducts.json'); this.gridDataSource = this.makeAsyncDataSource('customers.json'); this.state = { treeBoxValue: '1_1', gridBoxValue: [3], isGridBoxOpened: false, isTreeBoxOpened: false }; this.treeView_itemSelectionChanged = this.treeView_itemSelectionChanged.bind(this); this.syncTreeViewSelection = this.syncTreeViewSelection.bind(this); this.syncDataGridSelection = this.syncDataGridSelection.bind(this); this.dataGrid_onSelectionChanged = this.dataGrid_onSelectionChanged.bind(this); this.treeViewRender = this.treeViewRender.bind(this); this.treeView_onContentReady = this.treeView_onContentReady.bind(this); this.dataGridRender = this.dataGridRender.bind(this); this.onGridBoxOpened = this.onGridBoxOpened.bind(this); this.onTreeBoxOpened = this.onTreeBoxOpened.bind(this); this.onTreeItemClick = this.onTreeItemClick.bind(this); } makeAsyncDataSource(jsonFile) { return new CustomStore({ loadMode: 'raw', key: 'ID', load: function() { return fetch(`../../../../data/${ jsonFile}`) .then(response => response.json()); } }); } render() { 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={this.state.treeBoxValue} opened={this.state.isTreeBoxOpened} valueExpr="ID" displayExpr="name" placeholder="Select a value..." showClearButton={true} dataSource={this.treeDataSource} onValueChanged={this.syncTreeViewSelection} onOptionChanged={this.onTreeBoxOpened} contentRender={this.treeViewRender} /> </div> </div> <div className="dx-field"> <div className="dx-field-label">DropDownBox with embedded DataGrid</div> <div className="dx-field-value"> <DropDownBox value={this.state.gridBoxValue} opened={this.state.isGridBoxOpened} valueExpr="ID" deferRendering={false} displayExpr={this.gridBox_displayExpr} placeholder="Select a value..." showClearButton={true} dataSource={this.gridDataSource} onValueChanged={this.syncDataGridSelection} onOptionChanged={this.onGridBoxOpened} contentRender={this.dataGridRender} /> </div> </div> </div> ); } treeViewRender() { return ( <TreeView dataSource={this.treeDataSource} ref={(ref) => this.treeView = ref} dataStructure="plain" keyExpr="ID" parentIdExpr="categoryId" selectionMode="single" displayExpr="name" selectByClick={true} onContentReady={this.treeView_onContentReady} onItemClick={this.onTreeItemClick} onItemSelectionChanged={this.treeView_itemSelectionChanged} /> ); } dataGridRender() { return ( <DataGrid dataSource={this.gridDataSource} columns={gridColumns} hoverStateEnabled={true} selectedRowKeys={this.state.gridBoxValue} onSelectionChanged={this.dataGrid_onSelectionChanged} height="100%"> <Selection mode="single" /> <Scrolling mode="virtual" /> <Paging enabled={true} pageSize={10} /> <FilterRow visible={true} /> </DataGrid> ); } syncTreeViewSelection(e) { this.setState({ treeBoxValue: e.value }); if (!this.treeView) return; if (!e.value) { this.treeView.instance.unselectAll(); } else { this.treeView.instance.selectItem(e.value); } } syncDataGridSelection(e) { this.setState({ gridBoxValue: e.value }); } treeView_itemSelectionChanged(e) { this.setState({ treeBoxValue: e.component.getSelectedNodeKeys() }); } dataGrid_onSelectionChanged(e) { this.setState({ gridBoxValue: e.selectedRowKeys, isGridBoxOpened: false }); } gridBox_displayExpr(item) { return item && `${item.CompanyName } <${ item.Phone }>`; } treeView_onContentReady(e) { e.component.selectItem(this.state.treeBoxValue); } onTreeItemClick() { this.setState({ isTreeBoxOpened: false }); } onGridBoxOpened(e) { if(e.name === 'opened') { this.setState({ isGridBoxOpened: e.value }); } } onTreeBoxOpened(e) { if(e.name === 'opened') { this.setState({ isTreeBoxOpened: e.value }); } } } export default App;
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render( <App />, document.getElementById('app') );
<!DOCTYPE html> <html> <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/20.2.6/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.6/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import('./index.js'); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>
.dx-fieldset { height: 500px; }
System.config({ transpiler: 'plugin-babel', meta: { 'devextreme/localization.js': { "esModule": true }, }, paths: { 'npm:': 'https://unpkg.com/' }, defaultExtension: 'js', map: { 'react': 'npm:react@16.14.0/umd/react.development.js', 'react-dom': 'npm:react-dom@16.14.0/umd/react-dom.development.js', 'prop-types': 'npm:prop-types@15.7.2/prop-types.js', 'whatwg-fetch': 'npm:whatwg-fetch@2.0.4/fetch.js', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.26.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@20.2.6', 'devextreme-react': 'npm:devextreme-react@20.2.6', 'jszip': 'npm:jszip@3.6.0/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@0.10.3/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.0.18/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@2.0.24/dist/dx-gantt.js', 'preact': 'npm:preact@10.5.13/dist/preact.js', 'preact/hooks': 'npm:preact@10.5.13/hooks/dist/hooks.js', // 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' }, packages: { 'devextreme': { defaultExtension: 'js' }, 'devextreme-react': { main: 'index.js' }, 'devextreme/events/utils': { main: 'index' }, 'devextreme/events': { main: 'index' }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true, react: true } });