Single Selection

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;