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 SelectBox features used.
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Backend API
import React, { useCallback, useState } from 'react';
import SelectBox, { SelectBoxTypes } from 'devextreme-react/select-box';
import ArrayStore from 'devextreme/data/array_store';
import notify from 'devextreme/ui/notify';
import service from './data.ts';
import Field from './Field.tsx';
import Item from './Item.tsx';
const simpleProductLabel = { 'aria-label': 'Simple Product' };
const productIDLabel = { 'aria-label': 'Product ID' };
const productWithPlaceholderLabel = { 'aria-label': 'Product With Placeholder' };
const productLabel = { 'aria-label': 'Product' };
const readOnlyProductLabel = { 'aria-label': 'ReadOnly Product' };
const templatedProductLabel = { 'aria-label': 'Templated Product' };
const disabledProductLabel = { 'aria-label': 'Disabled Product' };
const products = service.getProducts();
const simpleProducts = service.getSimpleProducts();
const data = new ArrayStore({
data: products,
key: 'ID',
});
function App() {
const [value, setValue] = useState(service.getSimpleProducts()[0]);
const onValueChanged = useCallback((e: SelectBoxTypes.ValueChangedEvent) => {
setValue(e.value);
notify(`The value is changed to: "${e.value}"`);
}, []);
return (
<div>
<div className="dx-fieldset">
<div className="dx-field">
<div className="dx-field-label">Default mode</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
inputAttr={simpleProductLabel}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">With a custom placeholder</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
placeholder="Choose Product"
inputAttr={productWithPlaceholderLabel}
showClearButton={true}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Read only</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
defaultValue={simpleProducts[0]}
inputAttr={readOnlyProductLabel}
readOnly={true}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Disabled</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
inputAttr={disabledProductLabel}
defaultValue={simpleProducts[0]}
disabled={true}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Data source usage</div>
<div className="dx-field-value">
<SelectBox
dataSource={data}
displayExpr="Name"
inputAttr={productIDLabel}
valueExpr="ID"
defaultValue={products[0].ID}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Custom templates</div>
<div className="dx-field-value">
<SelectBox
id="custom-templates"
dataSource={products}
displayExpr="Name"
inputAttr={templatedProductLabel}
valueExpr="ID"
defaultValue={products[3].ID}
fieldRender={Field}
itemRender={Item}
/>
</div>
</div>
</div>
<div className="dx-fieldset">
<div className="dx-fieldset-header">Event Handling</div>
<div className="dx-field">
<div className="dx-field-label">Product</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
value={value}
inputAttr={productLabel}
onValueChanged={onValueChanged}
/>
</div>
</div>
<div className="current-value">
Selected product is <span>{value}</span>
</div>
</div>
</div>
);
}
export default App;
import React, { useCallback, useState } from 'react';
import SelectBox from 'devextreme-react/select-box';
import ArrayStore from 'devextreme/data/array_store';
import notify from 'devextreme/ui/notify';
import service from './data.js';
import Field from './Field.js';
import Item from './Item.js';
const simpleProductLabel = { 'aria-label': 'Simple Product' };
const productIDLabel = { 'aria-label': 'Product ID' };
const productWithPlaceholderLabel = { 'aria-label': 'Product With Placeholder' };
const productLabel = { 'aria-label': 'Product' };
const readOnlyProductLabel = { 'aria-label': 'ReadOnly Product' };
const templatedProductLabel = { 'aria-label': 'Templated Product' };
const disabledProductLabel = { 'aria-label': 'Disabled Product' };
const products = service.getProducts();
const simpleProducts = service.getSimpleProducts();
const data = new ArrayStore({
data: products,
key: 'ID',
});
function App() {
const [value, setValue] = useState(service.getSimpleProducts()[0]);
const onValueChanged = useCallback((e) => {
setValue(e.value);
notify(`The value is changed to: "${e.value}"`);
}, []);
return (
<div>
<div className="dx-fieldset">
<div className="dx-field">
<div className="dx-field-label">Default mode</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
inputAttr={simpleProductLabel}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">With a custom placeholder</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
placeholder="Choose Product"
inputAttr={productWithPlaceholderLabel}
showClearButton={true}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Read only</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
defaultValue={simpleProducts[0]}
inputAttr={readOnlyProductLabel}
readOnly={true}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Disabled</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
inputAttr={disabledProductLabel}
defaultValue={simpleProducts[0]}
disabled={true}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Data source usage</div>
<div className="dx-field-value">
<SelectBox
dataSource={data}
displayExpr="Name"
inputAttr={productIDLabel}
valueExpr="ID"
defaultValue={products[0].ID}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Custom templates</div>
<div className="dx-field-value">
<SelectBox
id="custom-templates"
dataSource={products}
displayExpr="Name"
inputAttr={templatedProductLabel}
valueExpr="ID"
defaultValue={products[3].ID}
fieldRender={Field}
itemRender={Item}
/>
</div>
</div>
</div>
<div className="dx-fieldset">
<div className="dx-fieldset-header">Event Handling</div>
<div className="dx-field">
<div className="dx-field-label">Product</div>
<div className="dx-field-value">
<SelectBox
items={simpleProducts}
value={value}
inputAttr={productLabel}
onValueChanged={onValueChanged}
/>
</div>
</div>
<div className="current-value">
Selected product is <span>{value}</span>
</div>
</div>
</div>
);
}
export default App;
import React from 'react';
import TextBox from 'devextreme-react/text-box';
const nameLabel = { 'aria-label': 'Name' };
export default function Field(data: { ImageSrc: any; Name: any }) {
return (
<div className="custom-item">
<img
alt="Product name"
src={data && data.ImageSrc}
/>
<TextBox
className="product-name"
inputAttr={nameLabel}
defaultValue={data && data.Name}
readOnly={true}
/>
</div>
);
}
import React from 'react';
export default function Item(data) {
return (
<div className="custom-item">
<img
alt="Product name"
src={data.ImageSrc}
/>
<div className="product-name">{data.Name}</div>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(<App />, document.getElementById('app'));
const simpleProducts = [
'HD Video Player',
'SuperHD Video Player',
'SuperPlasma 50',
'SuperLED 50',
'SuperLED 42',
'SuperLCD 55',
'SuperLCD 42',
'SuperPlasma 65',
'SuperLCD 70',
'Projector Plus',
'Projector PlusHT',
'ExcelRemote IR',
'ExcelRemote BT',
'ExcelRemote IP',
];
const products = [{
ID: 1,
Name: 'HD Video Player',
Price: 330,
Current_Inventory: 225,
Backorder: 0,
Manufacturing: 10,
Category: 'Video Players',
ImageSrc: '../../../../images/products/1-small.png',
}, {
ID: 2,
Name: 'SuperHD Player',
Price: 400,
Current_Inventory: 150,
Backorder: 0,
Manufacturing: 25,
Category: 'Video Players',
ImageSrc: '../../../../images/products/2-small.png',
}, {
ID: 3,
Name: 'SuperPlasma 50',
Price: 2400,
Current_Inventory: 0,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
ImageSrc: '../../../../images/products/3-small.png',
}, {
ID: 4,
Name: 'SuperLED 50',
Price: 1600,
Current_Inventory: 77,
Backorder: 0,
Manufacturing: 55,
Category: 'Televisions',
ImageSrc: '../../../../images/products/4-small.png',
}, {
ID: 5,
Name: 'SuperLED 42',
Price: 1450,
Current_Inventory: 445,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
ImageSrc: '../../../../images/products/5-small.png',
}, {
ID: 6,
Name: 'SuperLCD 55',
Price: 1350,
Current_Inventory: 345,
Backorder: 0,
Manufacturing: 5,
Category: 'Televisions',
ImageSrc: '../../../../images/products/6-small.png',
}, {
ID: 7,
Name: 'SuperLCD 42',
Price: 1200,
Current_Inventory: 210,
Backorder: 0,
Manufacturing: 20,
Category: 'Televisions',
ImageSrc: '../../../../images/products/7-small.png',
}, {
ID: 8,
Name: 'SuperPlasma 65',
Price: 3500,
Current_Inventory: 0,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
ImageSrc: '../../../../images/products/8-small.png',
}, {
ID: 9,
Name: 'SuperLCD 70',
Price: 4000,
Current_Inventory: 95,
Backorder: 0,
Manufacturing: 5,
Category: 'Televisions',
ImageSrc: '../../../../images/products/9-small.png',
}, {
ID: 10,
Name: 'DesktopLED 21',
Price: 175,
Current_Inventory: 0,
Backorder: 425,
Manufacturing: 75,
Category: 'Monitors',
ImageSrc: '../../../../images/products/10-small.png',
}, {
ID: 11,
Name: 'DesktopLED 19',
Price: 165,
Current_Inventory: 425,
Backorder: 0,
Manufacturing: 110,
Category: 'Monitors',
ImageSrc: '../../../../images/products/11-small.png',
}, {
ID: 12,
Name: 'DesktopLCD 21',
Price: 170,
Current_Inventory: 210,
Backorder: 0,
Manufacturing: 60,
Category: 'Monitors',
ImageSrc: '../../../../images/products/12-small.png',
}, {
ID: 13,
Name: 'DesktopLCD 19',
Price: 160,
Current_Inventory: 150,
Backorder: 0,
Manufacturing: 210,
Category: 'Monitors',
ImageSrc: '../../../../images/products/13-small.png',
}, {
ID: 14,
Name: 'Projector Plus',
Price: 550,
Current_Inventory: 0,
Backorder: 55,
Manufacturing: 10,
Category: 'Projectors',
ImageSrc: '../../../../images/products/14-small.png',
}, {
ID: 15,
Name: 'Projector PlusHD',
Price: 750,
Current_Inventory: 110,
Backorder: 0,
Manufacturing: 90,
Category: 'Projectors',
ImageSrc: '../../../../images/products/15-small.png',
}, {
ID: 16,
Name: 'Projector PlusHT',
Price: 1050,
Current_Inventory: 0,
Backorder: 75,
Manufacturing: 57,
Category: 'Projectors',
ImageSrc: '../../../../images/products/16-small.png',
}, {
ID: 17,
Name: 'ExcelRemote IR',
Price: 150,
Current_Inventory: 650,
Backorder: 0,
Manufacturing: 190,
Category: 'Automation',
ImageSrc: '../../../../images/products/17-small.png',
}, {
ID: 18,
Name: 'ExcelRemote BT',
Price: 180,
Current_Inventory: 310,
Backorder: 0,
Manufacturing: 0,
Category: 'Automation',
ImageSrc: '../../../../images/products/18-small.png',
}, {
ID: 19,
Name: 'ExcelRemote IP',
Price: 200,
Current_Inventory: 0,
Backorder: 325,
Manufacturing: 225,
Category: 'Automation',
ImageSrc: '../../../../images/products/19-small.png',
}];
export default {
getSimpleProducts() {
return simpleProducts;
},
getProducts() {
return products;
},
};
window.exports = window.exports || {};
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
jsx: 'react',
},
meta: {
'react': {
'esModule': true,
},
'typescript': {
'exports': 'ts',
},
'devextreme/time_zone_utils.js': {
'esModule': true,
},
'devextreme/localization.js': {
'esModule': true,
},
'devextreme/viz/palette.js': {
'esModule': true,
},
'openai': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
'bundles:': '../../../../bundles/',
'externals:': '../../../../bundles/externals/',
},
defaultExtension: 'js',
map: {
'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
'react': 'npm:react@17.0.2/umd/react.development.js',
'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',
'prop-types': 'npm:prop-types/prop-types.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign',
'devextreme': 'npm:devextreme@link:../../packages/devextreme/artifacts/npm/devextreme/cjs',
'devextreme-react': 'npm:devextreme-react@link:../../packages/devextreme-react/npm/cjs',
'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.5/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.54/dist/dx-gantt.js',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',
},
packages: {
'devextreme': {
defaultExtension: 'js',
},
'devextreme-react': {
main: 'index.js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/localization/messages': {
format: 'json',
defaultExtension: 'json',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.12/inferno/package.json',
],
babelOptions: {
sourceMaps: false,
stage0: true,
react: true,
},
};
System.config(window.config);
import React from 'react';
import TextBox from 'devextreme-react/text-box';
const nameLabel = { 'aria-label': 'Name' };
export default function Field(data) {
return (
<div className="custom-item">
<img
alt="Product name"
src={data && data.ImageSrc}
/>
<TextBox
className="product-name"
inputAttr={nameLabel}
defaultValue={data && data.Name}
readOnly={true}
/>
</div>
);
}
import React from 'react';
export default function Item(data) {
return (
<div className="custom-item">
<img
alt="Product name"
src={data.ImageSrc}
/>
<div className="product-name">{data.Name}</div>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
const simpleProducts = [
'HD Video Player',
'SuperHD Video Player',
'SuperPlasma 50',
'SuperLED 50',
'SuperLED 42',
'SuperLCD 55',
'SuperLCD 42',
'SuperPlasma 65',
'SuperLCD 70',
'Projector Plus',
'Projector PlusHT',
'ExcelRemote IR',
'ExcelRemote BT',
'ExcelRemote IP',
];
const products = [
{
ID: 1,
Name: 'HD Video Player',
Price: 330,
Current_Inventory: 225,
Backorder: 0,
Manufacturing: 10,
Category: 'Video Players',
ImageSrc: '../../../../images/products/1-small.png',
},
{
ID: 2,
Name: 'SuperHD Player',
Price: 400,
Current_Inventory: 150,
Backorder: 0,
Manufacturing: 25,
Category: 'Video Players',
ImageSrc: '../../../../images/products/2-small.png',
},
{
ID: 3,
Name: 'SuperPlasma 50',
Price: 2400,
Current_Inventory: 0,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
ImageSrc: '../../../../images/products/3-small.png',
},
{
ID: 4,
Name: 'SuperLED 50',
Price: 1600,
Current_Inventory: 77,
Backorder: 0,
Manufacturing: 55,
Category: 'Televisions',
ImageSrc: '../../../../images/products/4-small.png',
},
{
ID: 5,
Name: 'SuperLED 42',
Price: 1450,
Current_Inventory: 445,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
ImageSrc: '../../../../images/products/5-small.png',
},
{
ID: 6,
Name: 'SuperLCD 55',
Price: 1350,
Current_Inventory: 345,
Backorder: 0,
Manufacturing: 5,
Category: 'Televisions',
ImageSrc: '../../../../images/products/6-small.png',
},
{
ID: 7,
Name: 'SuperLCD 42',
Price: 1200,
Current_Inventory: 210,
Backorder: 0,
Manufacturing: 20,
Category: 'Televisions',
ImageSrc: '../../../../images/products/7-small.png',
},
{
ID: 8,
Name: 'SuperPlasma 65',
Price: 3500,
Current_Inventory: 0,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
ImageSrc: '../../../../images/products/8-small.png',
},
{
ID: 9,
Name: 'SuperLCD 70',
Price: 4000,
Current_Inventory: 95,
Backorder: 0,
Manufacturing: 5,
Category: 'Televisions',
ImageSrc: '../../../../images/products/9-small.png',
},
{
ID: 10,
Name: 'DesktopLED 21',
Price: 175,
Current_Inventory: 0,
Backorder: 425,
Manufacturing: 75,
Category: 'Monitors',
ImageSrc: '../../../../images/products/10-small.png',
},
{
ID: 11,
Name: 'DesktopLED 19',
Price: 165,
Current_Inventory: 425,
Backorder: 0,
Manufacturing: 110,
Category: 'Monitors',
ImageSrc: '../../../../images/products/11-small.png',
},
{
ID: 12,
Name: 'DesktopLCD 21',
Price: 170,
Current_Inventory: 210,
Backorder: 0,
Manufacturing: 60,
Category: 'Monitors',
ImageSrc: '../../../../images/products/12-small.png',
},
{
ID: 13,
Name: 'DesktopLCD 19',
Price: 160,
Current_Inventory: 150,
Backorder: 0,
Manufacturing: 210,
Category: 'Monitors',
ImageSrc: '../../../../images/products/13-small.png',
},
{
ID: 14,
Name: 'Projector Plus',
Price: 550,
Current_Inventory: 0,
Backorder: 55,
Manufacturing: 10,
Category: 'Projectors',
ImageSrc: '../../../../images/products/14-small.png',
},
{
ID: 15,
Name: 'Projector PlusHD',
Price: 750,
Current_Inventory: 110,
Backorder: 0,
Manufacturing: 90,
Category: 'Projectors',
ImageSrc: '../../../../images/products/15-small.png',
},
{
ID: 16,
Name: 'Projector PlusHT',
Price: 1050,
Current_Inventory: 0,
Backorder: 75,
Manufacturing: 57,
Category: 'Projectors',
ImageSrc: '../../../../images/products/16-small.png',
},
{
ID: 17,
Name: 'ExcelRemote IR',
Price: 150,
Current_Inventory: 650,
Backorder: 0,
Manufacturing: 190,
Category: 'Automation',
ImageSrc: '../../../../images/products/17-small.png',
},
{
ID: 18,
Name: 'ExcelRemote BT',
Price: 180,
Current_Inventory: 310,
Backorder: 0,
Manufacturing: 0,
Category: 'Automation',
ImageSrc: '../../../../images/products/18-small.png',
},
{
ID: 19,
Name: 'ExcelRemote IP',
Price: 200,
Current_Inventory: 0,
Backorder: 325,
Manufacturing: 225,
Category: 'Automation',
ImageSrc: '../../../../images/products/19-small.png',
},
];
export default {
getSimpleProducts() {
return simpleProducts;
},
getProducts() {
return products;
},
};
<!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/24.2.3/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.tsx");
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
</body>
</html>
/* stylelint-disable indentation */
/* stylelint-disable selector-descendant-combinator-no-non-space */
.dx-dropdownlist-popup-wrapper
.dx-list:not(.dx-list-select-decorator-enabled)
.dx-list-item-content {
padding-left: 7px;
padding-right: 7px;
}
.custom-item {
position: relative;
min-height: 30px;
}
.dx-dropdowneditor-input-wrapper .custom-item > img {
padding-left: 8px;
}
.custom-item .product-name {
display: inline-block;
padding-left: 50px;
text-indent: 0;
line-height: 30px;
font-size: 15px;
width: 100%;
}
.custom-item > img {
left: 1px;
position: absolute;
top: 50%;
margin-top: -15px;
}
.dx-theme-material #custom-templates .dx-texteditor-buttons-container {
display: none;
}
.current-value {
padding: 10px 0;
}
.current-value > span {
font-weight: bold;
}
.dx-theme-material .dx-selectbox-container .product-name {
padding-left: 58px;
}
This demo illustrates the following SelectBox properties:
- items
Specifies an array of items displayed in the SelectBox. - placeholder
Specifies the text that is displayed when no items are selected. - readOnly
Prevents users from changing the editor's value via the UI. - disabled
Specifies whether the SelectBox responds to user interaction. - dataSource
Binds the SelectBox to data. Unlike the items property, dataSource accepts the DataSource object that allows users to sort, filter, group, and shape data. - fieldTemplate and itemTemplate
Allow you to customize the text field and drop-down list items. - onValueChanged event handler
Use this function to perform an action when a user chooses a new value. In this demo, this function is used to display the selected value.
To get started with the DevExtreme SelectBox component, refer to the following tutorial for step-by-step instructions: Getting Started with SelectBox.