Plain Data Structure
Documentation
The TreeView's plain (one-dimensional) array contains items each of which references its parent item. 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:
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.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Thank you!
We appreciate your feedback.
We appreciate your feedback.
window.onload = function () {
const productName = ko.observable('');
const productPrice = ko.observable('');
const productImage = ko.observable('');
const viewModel = {
treeViewOptions: {
items: products,
dataStructure: 'plain',
parentIdExpr: 'categoryId',
keyExpr: 'ID',
displayExpr: 'name',
width: 300,
onItemClick(e) {
const item = e.itemData;
if (item.price) {
productImage(item.icon);
productName(item.name);
productPrice(`$${item.price}`);
} else {
productPrice('');
}
},
},
productName,
productPrice,
productImage,
};
ko.applyBindings(viewModel, document.getElementById('treeview'));
};
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<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" />
<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>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.5/css/dx.light.css" />
<script src="https://cdn3.devexpress.com/jslib/21.2.5/js/dx.all.js"></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" id="treeview">
<div id="simple-treeview" data-bind="dxTreeView: treeViewOptions"></div>
<!-- ko if: productPrice() -->
<div id="product-details">
<img src="" data-bind="attr: { src: productImage }" />
<div class="name" data-bind="text: productName"></div>
<div class="price" data-bind="text: productPrice"></div>
</div>
<!-- /ko -->
</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',
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,
},
];