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 ProgressBar features used.
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Backend API
import React, { useCallback, useEffect, useState } from 'react';
import { Button } from 'devextreme-react/button';
import { ProgressBar } from 'devextreme-react/progress-bar';
const maxValue = 10;
function formatTime(value) {
return `00:00:${(`0${value}`).slice(-2)}`;
}
function statusFormat(ratio: number) {
return `Loading: ${ratio * 100}%`;
}
const elementAttr = { 'aria-label': 'Progress Bar' };
let intervalId;
export default function App() {
const [seconds, setSeconds] = useState(maxValue);
const [buttonText, setButtonText] = useState('Start progress');
const [inProgress, setInProgress] = useState(false);
useEffect(() => {
if (seconds === 0) {
setButtonText('Restart progress');
setInProgress(!inProgress);
clearInterval(intervalId);
}
}, [seconds]);
const onButtonClick = useCallback(() => {
if (inProgress) {
setButtonText('Continue progress');
clearInterval(intervalId);
} else {
setButtonText('Stop progress');
if (seconds === 0) {
setSeconds(maxValue);
}
intervalId = setInterval(() => {
setSeconds((prevValue: number) => prevValue - 1);
}, 1000);
}
setInProgress(!inProgress);
}, [setInProgress, setButtonText, seconds, inProgress]);
return (
<div className="form">
<Button
id="progress-button"
text={buttonText}
width={200}
onClick={onButtonClick}
/>
<div className="progress-info">
Time left {formatTime(seconds)}
</div>
<ProgressBar
id="progress-bar-status"
className={seconds === 0 ? 'complete' : ''}
width="90%"
min={0}
max={maxValue}
elementAttr={elementAttr}
statusFormat={statusFormat}
value={maxValue - seconds}
/>
</div>
);
}
import React, { useCallback, useEffect, useState } from 'react';
import { Button } from 'devextreme-react/button';
import { ProgressBar } from 'devextreme-react/progress-bar';
const maxValue = 10;
function formatTime(value) {
return `00:00:${`0${value}`.slice(-2)}`;
}
function statusFormat(ratio) {
return `Loading: ${ratio * 100}%`;
}
const elementAttr = { 'aria-label': 'Progress Bar' };
let intervalId;
export default function App() {
const [seconds, setSeconds] = useState(maxValue);
const [buttonText, setButtonText] = useState('Start progress');
const [inProgress, setInProgress] = useState(false);
useEffect(() => {
if (seconds === 0) {
setButtonText('Restart progress');
setInProgress(!inProgress);
clearInterval(intervalId);
}
}, [seconds]);
const onButtonClick = useCallback(() => {
if (inProgress) {
setButtonText('Continue progress');
clearInterval(intervalId);
} else {
setButtonText('Stop progress');
if (seconds === 0) {
setSeconds(maxValue);
}
intervalId = setInterval(() => {
setSeconds((prevValue) => prevValue - 1);
}, 1000);
}
setInProgress(!inProgress);
}, [setInProgress, setButtonText, seconds, inProgress]);
return (
<div className="form">
<Button
id="progress-button"
text={buttonText}
width={200}
onClick={onButtonClick}
/>
<div className="progress-info">Time left {formatTime(seconds)}</div>
<ProgressBar
id="progress-bar-status"
className={seconds === 0 ? 'complete' : ''}
width="90%"
min={0}
max={maxValue}
elementAttr={elementAttr}
statusFormat={statusFormat}
value={maxValue - seconds}
/>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
<App />,
document.getElementById('app'),
);
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,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
defaultExtension: 'js',
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.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@15.8.1/prop-types.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@24.1.7/cjs',
'devextreme-react': 'npm:devextreme-react@24.1.7/cjs',
'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.12/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13',
'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@7.4.11/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@3.0.13/inferno/package.json',
],
babelOptions: {
sourceMaps: false,
stage0: true,
react: true,
},
};
System.config(window.config);
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
<!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/24.1.7/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>
.form {
padding: 20% 0;
text-align: center;
}
#progress-button {
margin-bottom: 20px;
}
#progress-bar-status {
display: inline-block;
padding-top: 8px;
}
.complete .dx-progressbar-range {
background-color: green;
}
When the ProgressBar reaches the maximum value, the complete event occurs. Use the onComplete function to handle it.
The progress status displays a ratio between the current and maximum values and indicates the progress. Use the showStatus property to display or hide the status string. To format the status string, use the statusFormat function.