DevExtreme Accessibility Compliance
DevExtreme component libraries meet a variety of WCAG and Section 508 compliance standards. To assess this demo's accessibility level, click the Run AXE® Validation button to launch the AXE® web accessibility evaluation tool.
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The overall accessibility level of your application depends on the TreeView features used.
Backend API
$(() => {
$('#simple-treeview').dxTreeView({
items: products,
width: 300,
onItemClick(e) {
const item = e.itemData;
if (item.price) {
$('#product-details').removeClass('hidden');
$('#product-details > img').attr('src', item.image);
$('#product-details > .price').text(`$${item.price}`);
$('#product-details > .name').text(item.text);
} else {
$('#product-details').addClass('hidden');
}
},
}).dxTreeView('instance');
});
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" 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" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/25.1.6/css/dx.light.css" />
<script src="js/dx.all.js?v=25.1.6"></script>
<script src="data.js"></script>
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div class="form">
<div id="simple-treeview"></div>
<div id="product-details" class="hidden">
<img src="" />
<div class="name"></div>
<div class="price"></div>
</div>
</div>
</div>
</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;
}
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,
}],
}],
}],
}];
Each object in the JavaScript TreeView's hierarchical data structure should include the following fields:
You can respectively use the keyExpr, displayExpr, and itemsExpr 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 expanded property, which specifies whether a node is collapsed or expanded. They also include the developer-defined price and image fields.
To get started with the DevExtreme JavaScript TreeView component, refer to the following tutorial for step-by-step instructions: Getting Started with JavaScript TreeView.