ContextMenu Integration

To display a DevExtreme ContextMenu when users right-click TreeView nodes, specify the nodes as the menu's target elements. To do this, set the menu's target property to a CSS selector. Since all TreeView nodes use the dx-treeview-item class, you can use this class' selector, as shown in this demo.

You can control each command's enabled state depending on the node where users invoked the context menu. Implement the TreeView's onItemContextMenu function; in it, set the disabled property to true for required commands.

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Backend API

import React from 'react'; import TreeView from 'devextreme-react/tree-view'; import ContextMenu from 'devextreme-react/context-menu'; import List from 'devextreme-react/list'; import service from './data.js'; class App extends React.Component { constructor(props) { super(props); this.contextMenuRef = React.createRef(); this.treeViewRef = React.createRef(); this.state = { products: service.getProducts(), menuItems: service.getMenuItems(), logItems: [], selectedTreeItem: undefined, }; this.treeViewItemContextMenu = this.treeViewItemContextMenu.bind(this); this.contextMenuItemClick = this.contextMenuItemClick.bind(this); } render() { return ( <div className="form"> <TreeView id="treeview" ref={this.treeViewRef} items={this.state.products} width={300} height={450} onItemContextMenu={this.treeViewItemContextMenu} /> <div className="log-container"> <div><i className="icon dx-icon-clock"></i> Operations log:</div> <List id="log" width={400} height={300} showScrollbar="always" items={this.state.logItems} /> </div> <ContextMenu ref={this.contextMenuRef} dataSource={this.state.menuItems} target="#treeview .dx-treeview-item" onItemClick={this.contextMenuItemClick} /> </div> ); } get treeView() { return this.treeViewRef.current.instance; } get contextMenu() { return this.contextMenuRef.current.instance; } treeViewItemContextMenu(e) { this.setState({ selectedTreeItem: e.itemData, }); const isProduct = e.itemData.price !== undefined; this.contextMenu.option('items[0].visible', !isProduct); this.contextMenu.option('items[1].visible', !isProduct); this.contextMenu.option('items[2].visible', isProduct); this.contextMenu.option('items[3].visible', isProduct); this.contextMenu.option('items[0].disabled', e.node.expanded); this.contextMenu.option('items[1].disabled', !e.node.expanded); } contextMenuItemClick(e) { let logEntry = ''; switch (e.itemData.id) { case 'expand': { logEntry = `The '${this.state.selectedTreeItem.text}' group was expanded`; this.treeView.expandItem(this.state.selectedTreeItem.id); break; } case 'collapse': { logEntry = `The '${this.state.selectedTreeItem.text}' group was collapsed`; this.treeView.collapseItem(this.state.selectedTreeItem.id); break; } case 'details': { logEntry = `Details about '${this.state.selectedTreeItem.text}' were displayed`; break; } case 'copy': { logEntry = `Information about '${this.state.selectedTreeItem.text}' was copied`; break; } default: break; } const logItems = this.state.logItems.concat([logEntry]); this.setState({ logItems, }); } } 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/23.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.6.12/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>

.form { display: flex; } .form > div, #treeview { display: inline-block; vertical-align: top; } .log-container { padding: 20px; margin-left: 20px; font-size: 115%; font-weight: bold; background-color: rgba(191, 191, 191, 0.15); height: 100%; } .log-container .dx-icon-clock { position: relative; top: 1px; } #log { margin-top: 10px; } #log .dx-empty-message { padding-left: 0; } .dx-list-item-content { padding-left: 0; }