Backend API
import React, { useCallback, useRef, useState } from 'react';
import { TreeView } from 'devextreme-react/tree-view';
import type { TreeViewTypes, TreeViewRef } from 'devextreme-react/tree-view';
import { ContextMenu } from 'devextreme-react/context-menu';
import type { ContextMenuTypes } from 'devextreme-react/context-menu';
import List from 'devextreme-react/list';
import { products, menuItems } from './data.ts';
import type { Product, MenuItem } from './types';
const App = () => {
const [contextMenuItems, setContextMenuItems] = useState<MenuItem[]>(menuItems);
const [logItems, setLogItems] = useState<string[]>([]);
const [selectedTreeItem, setSelectedTreeItem] = useState<Product | undefined>(undefined);
const treeViewRef = useRef<TreeViewRef>(null);
const treeViewItemContextMenu = useCallback((
e: TreeViewTypes.ItemContextMenuEvent<Product>,
): void => {
setSelectedTreeItem(e.itemData);
const isProductItem = !e.itemData?.items;
const isExpanded = e.node?.expanded;
setContextMenuItems((prev: MenuItem[]): MenuItem[] => prev.map((item: MenuItem, index: number): MenuItem => {
switch (index) {
case 0:
return {
...item,
visible: !isProductItem,
disabled: isExpanded,
};
case 1:
return {
...item,
visible: !isProductItem,
disabled: !isExpanded,
};
case 2:
case 3:
return {
...item,
visible: isProductItem,
};
default:
return item;
}
}));
}, []);
const contextMenuItemClick = useCallback((
e: ContextMenuTypes.ItemClickEvent<Product>,
) => {
let logEntry = '';
switch (e.itemData?.id) {
case 'expand': {
logEntry = `The '${selectedTreeItem?.text}' group was expanded`;
treeViewRef.current?.instance().expandItem(selectedTreeItem?.id);
break;
}
case 'collapse': {
logEntry = `The '${selectedTreeItem?.text}' group was collapsed`;
treeViewRef.current?.instance().collapseItem(selectedTreeItem?.id);
break;
}
case 'details': {
logEntry = `Details about '${selectedTreeItem?.text}' were displayed`;
break;
}
case 'copy': {
logEntry = `Information about '${selectedTreeItem?.text}' was copied`;
break;
}
default:
break;
}
const updatedLogItems = [...logItems, logEntry];
setLogItems(updatedLogItems);
}, [logItems, selectedTreeItem]);
return (
<div className="form">
<TreeView
id="treeview"
ref={treeViewRef}
items={products}
width={300}
height={450}
onItemContextMenu={treeViewItemContextMenu}
/>
<div className="log-container">
<div>
<i className="icon dx-icon-clock"></i>
<span> Operations log:</span>
</div>
<List
id="log"
width={400}
height={300}
showScrollbar="always"
items={logItems}
/>
</div>
<ContextMenu
dataSource={contextMenuItems}
target="#treeview .dx-treeview-item"
onItemClick={contextMenuItemClick}
/>
</div>
);
};
export default App;
import React, { useCallback, useRef, useState } from 'react';
import { TreeView } from 'devextreme-react/tree-view';
import { ContextMenu } from 'devextreme-react/context-menu';
import List from 'devextreme-react/list';
import { products, menuItems } from './data.js';
const App = () => {
const [contextMenuItems, setContextMenuItems] = useState(menuItems);
const [logItems, setLogItems] = useState([]);
const [selectedTreeItem, setSelectedTreeItem] = useState(undefined);
const treeViewRef = useRef(null);
const treeViewItemContextMenu = useCallback((e) => {
setSelectedTreeItem(e.itemData);
const isProductItem = !e.itemData?.items;
const isExpanded = e.node?.expanded;
setContextMenuItems((prev) =>
prev.map((item, index) => {
switch (index) {
case 0:
return {
...item,
visible: !isProductItem,
disabled: isExpanded,
};
case 1:
return {
...item,
visible: !isProductItem,
disabled: !isExpanded,
};
case 2:
case 3:
return {
...item,
visible: isProductItem,
};
default:
return item;
}
}),
);
}, []);
const contextMenuItemClick = useCallback(
(e) => {
let logEntry = '';
switch (e.itemData?.id) {
case 'expand': {
logEntry = `The '${selectedTreeItem?.text}' group was expanded`;
treeViewRef.current?.instance().expandItem(selectedTreeItem?.id);
break;
}
case 'collapse': {
logEntry = `The '${selectedTreeItem?.text}' group was collapsed`;
treeViewRef.current?.instance().collapseItem(selectedTreeItem?.id);
break;
}
case 'details': {
logEntry = `Details about '${selectedTreeItem?.text}' were displayed`;
break;
}
case 'copy': {
logEntry = `Information about '${selectedTreeItem?.text}' was copied`;
break;
}
default:
break;
}
const updatedLogItems = [...logItems, logEntry];
setLogItems(updatedLogItems);
},
[logItems, selectedTreeItem],
);
return (
<div className="form">
<TreeView
id="treeview"
ref={treeViewRef}
items={products}
width={300}
height={450}
onItemContextMenu={treeViewItemContextMenu}
/>
<div className="log-container">
<div>
<i className="icon dx-icon-clock"></i>
<span> Operations log:</span>
</div>
<List
id="log"
width={400}
height={300}
showScrollbar="always"
items={logItems}
/>
</div>
<ContextMenu
dataSource={contextMenuItems}
target="#treeview .dx-treeview-item"
onItemClick={contextMenuItemClick}
/>
</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, MenuItem } from './types.ts';
export const menuItems: MenuItem[] = [
{ id: 'expand', text: 'Expand category' },
{ id: 'collapse', text: 'Collapse category' },
{ id: 'details', text: 'Show product details' },
{ id: 'copy', text: 'Copy product info' },
];
export const products: Product[] = [{
id: '1',
text: 'Stores',
expanded: true,
items: [{
id: '1_1',
text: 'Super Mart of the West',
expanded: true,
items: [{
id: '1_1_1',
text: 'Video Players',
items: [{
id: '1_1_1_1',
text: 'HD Video Player',
price: 220,
image: '../../../../images/products/1.png',
}, {
id: '1_1_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 270,
}],
}, {
id: '1_1_2',
text: 'Televisions',
expanded: true,
items: [{
id: '1_1_2_1',
text: 'SuperLCD 42',
image: '../../../../images/products/7.png',
price: 1200,
}, {
id: '1_1_2_2',
text: 'SuperLED 42',
image: '../../../../images/products/5.png',
price: 1450,
}, {
id: '1_1_2_3',
text: 'SuperLED 50',
image: '../../../../images/products/4.png',
price: 1600,
}, {
id: '1_1_2_4',
text: 'SuperLCD 55',
image: '../../../../images/products/6.png',
price: 1350,
}, {
id: '1_1_2_5',
text: 'SuperLCD 70',
image: '../../../../images/products/9.png',
price: 4000,
}],
}, {
id: '1_1_3',
text: 'Monitors',
expanded: true,
items: [{
id: '1_1_3_1',
text: '19"',
expanded: true,
items: [{
id: '1_1_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 160,
}],
}, {
id: '1_1_3_2',
text: '21"',
items: [{
id: '1_1_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 170,
}, {
id: '1_1_3_2_2',
text: 'DesktopLED 21',
image: '../../../../images/products/13.png',
price: 175,
}],
}],
}, {
id: '1_1_4',
text: 'Projectors',
items: [{
id: '1_1_4_1',
text: 'Projector Plus',
image: '../../../../images/products/14.png',
price: 550,
}, {
id: '1_1_4_2',
text: 'Projector PlusHD',
image: '../../../../images/products/15.png',
price: 750,
}],
}],
}, {
id: '1_2',
text: 'Braeburn',
items: [{
id: '1_2_1',
text: 'Video Players',
items: [{
id: '1_2_1_1',
text: 'HD Video Player',
image: '../../../../images/products/1.png',
price: 240,
}, {
id: '1_2_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 300,
}],
}, {
id: '1_2_2',
text: 'Televisions',
items: [{
id: '1_2_2_1',
text: 'SuperPlasma 50',
image: '../../../../images/products/3.png',
price: 1800,
}, {
id: '1_2_2_2',
text: 'SuperPlasma 65',
image: '../../../../images/products/8.png',
price: 3500,
}],
}, {
id: '1_2_3',
text: 'Monitors',
items: [{
id: '1_2_3_1',
text: '19"',
items: [{
id: '1_2_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 170,
}],
}, {
id: '1_2_3_2',
text: '21"',
items: [{
id: '1_2_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 180,
}, {
id: '1_2_3_2_2',
text: 'DesktopLED 21',
image: '../../../../images/products/13.png',
price: 190,
}],
}],
}],
}, {
id: '1_3',
text: 'E-Mart',
items: [{
id: '1_3_1',
text: 'Video Players',
items: [{
id: '1_3_1_1',
text: 'HD Video Player',
image: '../../../../images/products/1.png',
price: 220,
}, {
id: '1_3_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 275,
}],
}, {
id: '1_3_3',
text: 'Monitors',
items: [{
id: '1_3_3_1',
text: '19"',
items: [{
id: '1_3_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 165,
}],
}, {
id: '1_3_3_2',
text: '21"',
items: [{
id: '1_3_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 175,
}],
}],
}],
}, {
id: '1_4',
text: 'Walters',
items: [{
id: '1_4_1',
text: 'Video Players',
items: [{
id: '1_4_1_1',
text: 'HD Video Player',
image: '../../../../images/products/1.png',
price: 210,
}, {
id: '1_4_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 250,
}],
}, {
id: '1_4_2',
text: 'Televisions',
items: [{
id: '1_4_2_1',
text: 'SuperLCD 42',
image: '../../../../images/products/7.png',
price: 1100,
}, {
id: '1_4_2_2',
text: 'SuperLED 42',
image: '../../../../images/products/5.png',
price: 1400,
}, {
id: '1_4_2_3',
text: 'SuperLED 50',
image: '../../../../images/products/4.png',
price: 1500,
}, {
id: '1_4_2_4',
text: 'SuperLCD 55',
image: '../../../../images/products/6.png',
price: 1300,
}, {
id: '1_4_2_5',
text: 'SuperLCD 70',
image: '../../../../images/products/9.png',
price: 4000,
}, {
id: '1_4_2_6',
text: 'SuperPlasma 50',
image: '../../../../images/products/3.png',
price: 1700,
}],
}, {
id: '1_4_3',
text: 'Monitors',
items: [{
id: '1_4_3_1',
text: '19"',
items: [{
id: '1_4_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 160,
}],
}, {
id: '1_4_3_2',
text: '21"',
items: [{
id: '1_4_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 170,
}, {
id: '1_4_3_2_2',
text: 'DesktopLED 21',
image: '../../../../images/products/13.png',
price: 180,
}],
}],
}, {
id: '1_4_4',
text: 'Projectors',
items: [{
id: '1_4_4_1',
text: 'Projector Plus',
image: '../../../../images/products/14.png',
price: 550,
}, {
id: '1_4_4_2',
text: 'Projector PlusHD',
image: '../../../../images/products/15.png',
price: 750,
}],
}],
}],
}];
type ProductItem = {
id: string;
text: string;
price: number;
image: string;
};
export type Product = {
id: string;
text: string;
expanded?: boolean;
items?: (Product | ProductItem)[];
};
export type MenuItem = {
id: string;
text: string;
visible?: boolean;
disabled?: boolean;
};
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
export const menuItems = [
{ id: 'expand', text: 'Expand category' },
{ id: 'collapse', text: 'Collapse category' },
{ id: 'details', text: 'Show product details' },
{ id: 'copy', text: 'Copy product info' },
];
export const products = [
{
id: '1',
text: 'Stores',
expanded: true,
items: [
{
id: '1_1',
text: 'Super Mart of the West',
expanded: true,
items: [
{
id: '1_1_1',
text: 'Video Players',
items: [
{
id: '1_1_1_1',
text: 'HD Video Player',
price: 220,
image: '../../../../images/products/1.png',
},
{
id: '1_1_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 270,
},
],
},
{
id: '1_1_2',
text: 'Televisions',
expanded: true,
items: [
{
id: '1_1_2_1',
text: 'SuperLCD 42',
image: '../../../../images/products/7.png',
price: 1200,
},
{
id: '1_1_2_2',
text: 'SuperLED 42',
image: '../../../../images/products/5.png',
price: 1450,
},
{
id: '1_1_2_3',
text: 'SuperLED 50',
image: '../../../../images/products/4.png',
price: 1600,
},
{
id: '1_1_2_4',
text: 'SuperLCD 55',
image: '../../../../images/products/6.png',
price: 1350,
},
{
id: '1_1_2_5',
text: 'SuperLCD 70',
image: '../../../../images/products/9.png',
price: 4000,
},
],
},
{
id: '1_1_3',
text: 'Monitors',
expanded: true,
items: [
{
id: '1_1_3_1',
text: '19"',
expanded: true,
items: [
{
id: '1_1_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 160,
},
],
},
{
id: '1_1_3_2',
text: '21"',
items: [
{
id: '1_1_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 170,
},
{
id: '1_1_3_2_2',
text: 'DesktopLED 21',
image: '../../../../images/products/13.png',
price: 175,
},
],
},
],
},
{
id: '1_1_4',
text: 'Projectors',
items: [
{
id: '1_1_4_1',
text: 'Projector Plus',
image: '../../../../images/products/14.png',
price: 550,
},
{
id: '1_1_4_2',
text: 'Projector PlusHD',
image: '../../../../images/products/15.png',
price: 750,
},
],
},
],
},
{
id: '1_2',
text: 'Braeburn',
items: [
{
id: '1_2_1',
text: 'Video Players',
items: [
{
id: '1_2_1_1',
text: 'HD Video Player',
image: '../../../../images/products/1.png',
price: 240,
},
{
id: '1_2_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 300,
},
],
},
{
id: '1_2_2',
text: 'Televisions',
items: [
{
id: '1_2_2_1',
text: 'SuperPlasma 50',
image: '../../../../images/products/3.png',
price: 1800,
},
{
id: '1_2_2_2',
text: 'SuperPlasma 65',
image: '../../../../images/products/8.png',
price: 3500,
},
],
},
{
id: '1_2_3',
text: 'Monitors',
items: [
{
id: '1_2_3_1',
text: '19"',
items: [
{
id: '1_2_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 170,
},
],
},
{
id: '1_2_3_2',
text: '21"',
items: [
{
id: '1_2_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 180,
},
{
id: '1_2_3_2_2',
text: 'DesktopLED 21',
image: '../../../../images/products/13.png',
price: 190,
},
],
},
],
},
],
},
{
id: '1_3',
text: 'E-Mart',
items: [
{
id: '1_3_1',
text: 'Video Players',
items: [
{
id: '1_3_1_1',
text: 'HD Video Player',
image: '../../../../images/products/1.png',
price: 220,
},
{
id: '1_3_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 275,
},
],
},
{
id: '1_3_3',
text: 'Monitors',
items: [
{
id: '1_3_3_1',
text: '19"',
items: [
{
id: '1_3_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 165,
},
],
},
{
id: '1_3_3_2',
text: '21"',
items: [
{
id: '1_3_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 175,
},
],
},
],
},
],
},
{
id: '1_4',
text: 'Walters',
items: [
{
id: '1_4_1',
text: 'Video Players',
items: [
{
id: '1_4_1_1',
text: 'HD Video Player',
image: '../../../../images/products/1.png',
price: 210,
},
{
id: '1_4_1_2',
text: 'SuperHD Video Player',
image: '../../../../images/products/2.png',
price: 250,
},
],
},
{
id: '1_4_2',
text: 'Televisions',
items: [
{
id: '1_4_2_1',
text: 'SuperLCD 42',
image: '../../../../images/products/7.png',
price: 1100,
},
{
id: '1_4_2_2',
text: 'SuperLED 42',
image: '../../../../images/products/5.png',
price: 1400,
},
{
id: '1_4_2_3',
text: 'SuperLED 50',
image: '../../../../images/products/4.png',
price: 1500,
},
{
id: '1_4_2_4',
text: 'SuperLCD 55',
image: '../../../../images/products/6.png',
price: 1300,
},
{
id: '1_4_2_5',
text: 'SuperLCD 70',
image: '../../../../images/products/9.png',
price: 4000,
},
{
id: '1_4_2_6',
text: 'SuperPlasma 50',
image: '../../../../images/products/3.png',
price: 1700,
},
],
},
{
id: '1_4_3',
text: 'Monitors',
items: [
{
id: '1_4_3_1',
text: '19"',
items: [
{
id: '1_4_3_1_1',
text: 'DesktopLCD 19',
image: '../../../../images/products/10.png',
price: 160,
},
],
},
{
id: '1_4_3_2',
text: '21"',
items: [
{
id: '1_4_3_2_1',
text: 'DesktopLCD 21',
image: '../../../../images/products/12.png',
price: 170,
},
{
id: '1_4_3_2_2',
text: 'DesktopLED 21',
image: '../../../../images/products/13.png',
price: 180,
},
],
},
],
},
{
id: '1_4_4',
text: 'Projectors',
items: [
{
id: '1_4_4_1',
text: 'Projector Plus',
image: '../../../../images/products/14.png',
price: 550,
},
{
id: '1_4_4_2',
text: 'Projector PlusHD',
image: '../../../../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>
.form {
display: flex;
}
.form > div,
#treeview {
display: inline-block;
vertical-align: top;
}
.log-container {
padding: 20px;
margin-left: 20px;
font-weight: 600;
background-color: rgba(191, 191, 191, 0.15);
}
.log-container > div:first-child {
display: flex;
align-items: center;
margin-bottom: 10px;
}
.log-container .dx-icon-clock {
font-size: var(--dx-font-size-icon);
}
#log .dx-empty-message {
padding-left: 0;
}
.dx-list-item-content {
padding-left: 0;
}