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React Tree View - Plain Data Structure

The TreeView's plain (one-dimensional) array contains items each of which references its parent item.

Backend API
import React, { useCallback, useState } from 'react'; import TreeView, { type TreeViewTypes } from 'devextreme-react/tree-view'; import { products } from './data.ts'; import type { Product } from './types.ts'; const App = () => { const [currentItem, setCurrentItem] = useState<Product>(products[0]); const selectItem = useCallback((e: TreeViewTypes.ItemClickEvent<Product>): void => { if (!e.itemData) { return; } setCurrentItem({ ...e.itemData }); }, []); return ( <div className="form"> <TreeView id="simple-treeview" items={products} dataStructure="plain" displayExpr="name" parentIdExpr="categoryId" keyExpr="ID" width={300} onItemClick={selectItem} /> {currentItem.price && ( <div id="product-details"> <img alt={currentItem.name} src={currentItem.icon} /> <div className="name">{currentItem.name}</div> <div className="price">{`$${currentItem.price}`}</div> </div> )} </div> ); }; export default App;
import React, { useCallback, useState } from 'react'; import TreeView from 'devextreme-react/tree-view'; import { products } from './data.js'; const App = () => { const [currentItem, setCurrentItem] = useState(products[0]); const selectItem = useCallback((e) => { if (!e.itemData) { return; } setCurrentItem({ ...e.itemData }); }, []); return ( <div className="form"> <TreeView id="simple-treeview" items={products} dataStructure="plain" displayExpr="name" parentIdExpr="categoryId" keyExpr="ID" width={300} onItemClick={selectItem} /> {currentItem.price && ( <div id="product-details"> <img alt={currentItem.name} src={currentItem.icon} /> <div className="name">{currentItem.name}</div> <div className="price">{`$${currentItem.price}`}</div> </div> )} </div> ); }; export default App;
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.tsx'; ReactDOM.render( <App />, document.getElementById('app'), );
import type { Product } from './types'; export const products: Product[] = [{ 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', icon: '../../../../images/products/1.png', price: 220, }, { ID: '1_1_1_2', categoryId: '1_1_1', name: 'SuperHD Video Player', icon: '../../../../images/products/2.png', 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', icon: '../../../../images/products/7.png', price: 1200, }, { ID: '1_1_2_2', categoryId: '1_1_2', name: 'SuperLED 42', icon: '../../../../images/products/5.png', price: 1450, }, { ID: '1_1_2_3', categoryId: '1_1_2', name: 'SuperLED 50', icon: '../../../../images/products/4.png', price: 1600, }, { ID: '1_1_2_4', categoryId: '1_1_2', name: 'SuperLCD 55', icon: '../../../../images/products/6.png', price: 1750, }, { ID: '1_1_2_5', categoryId: '1_1_2', name: 'SuperLCD 70', icon: '../../../../images/products/9.png', 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', icon: '../../../../images/products/10.png', price: 160, }, { ID: '1_1_4', categoryId: '1_1', name: 'Projectors', }, { ID: '1_1_4_1', categoryId: '1_1_4', name: 'Projector Plus', icon: '../../../../images/products/14.png', price: 550, }, { ID: '1_1_4_2', categoryId: '1_1_4', name: 'Projector PlusHD', icon: '../../../../images/products/15.png', price: 750, }, ];
export interface Product { ID: string; name: string; expanded?: boolean; categoryId?: string; icon?: string; price?: number; }
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(<App />, document.getElementById('app'));
export const products = [ { 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', icon: '../../../../images/products/1.png', price: 220, }, { ID: '1_1_1_2', categoryId: '1_1_1', name: 'SuperHD Video Player', icon: '../../../../images/products/2.png', 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', icon: '../../../../images/products/7.png', price: 1200, }, { ID: '1_1_2_2', categoryId: '1_1_2', name: 'SuperLED 42', icon: '../../../../images/products/5.png', price: 1450, }, { ID: '1_1_2_3', categoryId: '1_1_2', name: 'SuperLED 50', icon: '../../../../images/products/4.png', price: 1600, }, { ID: '1_1_2_4', categoryId: '1_1_2', name: 'SuperLCD 55', icon: '../../../../images/products/6.png', price: 1750, }, { ID: '1_1_2_5', categoryId: '1_1_2', name: 'SuperLCD 70', icon: '../../../../images/products/9.png', 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', icon: '../../../../images/products/10.png', price: 160, }, { ID: '1_1_4', categoryId: '1_1', name: 'Projectors', }, { ID: '1_1_4_1', categoryId: '1_1_4', name: 'Projector Plus', icon: '../../../../images/products/14.png', price: 550, }, { ID: '1_1_4_2', categoryId: '1_1_4', name: 'Projector PlusHD', icon: '../../../../images/products/15.png', price: 750, }, ];
<!DOCTYPE html> <html lang="en"> <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=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="./bundle.css" /> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> <script src="bundles/vendor/react.vendor.js"></script> <script src="./bundle.js"></script> </body> </html>
#simple-treeview, #product-details { display: inline-block; } #product-details { vertical-align: top; width: 400px; height: 420px; margin-left: 20px; } #product-details > img { border: none; height: 300px; width: 400px; } #product-details > .name { text-align: center; font-size: 20px; } #product-details > .price { text-align: center; font-size: 24px; } .dark #product-details > div { color: #f0f0f0; } .hidden { visibility: hidden; }

Use either of the following properties to bind the component to plain data:

  • items[]
    Assigns a local array as shown in this demo.

  • dataSource
    Assigns a DataSource object that allows you to perform data shaping operations and use a remote source.

Each object in the TreeView's plain data structure should include the following fields:

  • id
    Unique item identifier.

  • parentId
    Identifier of the parent item.

  • text
    Text displayed by the item.

You can respectively use the keyExpr, parentIdExpr, and displayExpr properties to specify custom names for the above-mentioned fields. Node objects can also include developer-defined fields and properties from this help section: items[].

In this demo, nodes use the icon and expanded properties. These properties specify the icon and whether a node is collapsed or expanded. Some nodes also include the developer-defined price field.