Backend API
import React, { useCallback, useState } from 'react';
import { SpeechToText } from 'devextreme-react/speech-to-text';
import { TextArea } from 'devextreme-react/text-area';
import { Button } from 'devextreme-react/button';
import type { ButtonTypes } from 'devextreme-react/button';
import { SelectBox } from 'devextreme-react/select-box';
import { Switch } from 'devextreme-react/switch';
import notify from 'devextreme/ui/notify';
import { displayModes, stylingModes, types, languages, langMap } from './data.ts';
import type { Language } from './data.ts';
declare global {
interface Window {
SpeechRecognition: any;
webkitSpeechRecognition: any;
}
}
let state = 'initial';
const textAreaLabel = { 'aria-label': 'Recognized Text' };
const displayModeLabel = { 'aria-label': 'Display Mode' };
const stylingModeLabel = { 'aria-label': 'Styling Mode' };
const typeLabel = { 'aria-label': 'Type' };
const languageLabel = { 'aria-label': 'Language' };
export default function App() {
const [startText, setStartText] = useState<string>('');
const [stopText, setStopText] = useState<string>('');
const [displayMode, setDisplayMode] = useState<string>(displayModes[0]);
const [stylingMode, setStylingMode] = useState<ButtonTypes.ButtonStyle>(stylingModes[0].value);
const [type, setType] = useState<ButtonTypes.ButtonType>(types[2].value);
const [hint, setHint] = useState<string>('Start voice recognition');
const [disabled, setDisabled] = useState<boolean>(false);
const [textAreaValue, setTextAreaValue] = useState<string>('');
const [language, setLanguage] = useState<Language>(languages[0]);
const [interimResults, setInterimResults] = useState<boolean>(true);
const [continuous, setContinuous] = useState<boolean>(false);
const [animation, setAnimation] = useState<boolean>(true);
const speechRecognitionConfig = {
lang: langMap[language],
interimResults,
continuous,
};
const onStartClick = useCallback(() => {
if (!window.SpeechRecognition && !window.webkitSpeechRecognition) {
notify({
message: 'The browser does not support Web Speech API (SpeechRecognition).',
type: 'error',
displayTime: 7000,
position: 'bottom center',
width: 'auto',
});
return;
}
state = 'listening';
setHint('Stop voice recognition');
if (displayMode !== 'Custom') {
return;
}
setType('danger');
}, [displayMode]);
const onEnd = useCallback(() => {
state = 'initial';
setHint('Start voice recognition');
if (displayMode !== 'Custom') {
return;
}
setType('default');
}, [displayMode]);
const onResult = useCallback(({ event }) => {
const { results } = event;
const resultText = Object.values(results)
.map((resultItem: any) => resultItem[0].transcript.trim())
.join(' ');
setTextAreaValue(resultText);
}, []);
const onTextAreaValueChanged = useCallback(({ value }) => {
setTextAreaValue(value);
}, []);
const onClearButtonClick = useCallback(() => {
setTextAreaValue('');
}, []);
const onDisplayModeValueChanged = useCallback(({ value }) => {
setDisplayMode(value);
if (value === 'Text and Icon') {
setStartText('Dictate');
setStopText('Stop');
return;
}
setStartText('');
setStopText('');
if (value === 'Custom') {
setStylingMode('contained');
setType(state === 'initial' ? 'default' : 'danger');
}
}, []);
const onStylingModeValueChanged = useCallback(({ value }) => {
setStylingMode(value);
}, []);
const onTypeValueChanged = useCallback(({ value }) => {
setType(value);
}, []);
const onDisabledValueChanged = useCallback(({ value }) => {
setDisabled(value);
}, []);
const onLanguageValueChanged = useCallback(({ value }) => {
setLanguage(value);
}, []);
const onInterimResultsValueChanged = useCallback(({ value }) => {
setInterimResults(value);
}, []);
const onContinuousValueChanged = useCallback(({ value }) => {
setContinuous(value);
}, []);
const onAnimationValueChanged = useCallback(({ value }) => {
setAnimation(value);
}, []);
return (
<div className='speech-to-text-demo'>
<div className='speech-to-text-container'>
<span>Use voice recognition (speech to text)</span>
<SpeechToText
id='speech-to-text'
className={ `${!animation ? 'animation-disabled' : ''} ${displayMode === 'Custom' ? 'custom-button' : ''}` }
startText={startText}
stopText={stopText}
stylingMode={stylingMode}
type={type}
hint={hint}
speechRecognitionConfig={speechRecognitionConfig}
disabled={disabled}
onStartClick={onStartClick}
onStopClick={onEnd}
onEnd={onEnd}
onResult={onResult}
/>
<TextArea
id='text-area'
value={textAreaValue}
width={360}
height={120}
placeholder='Recognized text will appear here...'
inputAttr={textAreaLabel}
onValueChanged={onTextAreaValueChanged}
/>
<Button
text='Clear'
disabled={textAreaValue === ''}
onClick={onClearButtonClick}
/>
</div>
<div className='options'>
<div className='caption'>Options</div>
<div className='option'>
<div>Display Mode</div>
<SelectBox
value={displayMode}
dataSource={displayModes}
inputAttr={displayModeLabel}
onValueChanged={onDisplayModeValueChanged}
/>
</div>
<div className='option'>
<div>Styling Mode</div>
<SelectBox
value={stylingMode}
dataSource={stylingModes}
valueExpr='value'
displayExpr='displayValue'
disabled={displayMode === 'Custom'}
inputAttr={stylingModeLabel}
onValueChanged={onStylingModeValueChanged}
/>
</div>
<div className='option'>
<div>Type</div>
<SelectBox
value={type}
dataSource={types}
valueExpr='value'
displayExpr='displayValue'
disabled={displayMode === 'Custom'}
inputAttr={typeLabel}
onValueChanged={onTypeValueChanged}
/>
</div>
<div className='switch'>
<Switch value={disabled} onValueChanged={onDisabledValueChanged} />
<span>Disabled</span>
</div>
<div className='option-separator'></div>
<div className='option'>
<div>Language</div>
<SelectBox
value={language}
dataSource={languages}
inputAttr={languageLabel}
onValueChanged={onLanguageValueChanged}
/>
</div>
<div className='switch'>
<Switch
value={interimResults}
onValueChanged={onInterimResultsValueChanged}
/>
<span>Interim Results</span>
</div>
<div className='switch'>
<Switch
value={continuous}
onValueChanged={onContinuousValueChanged}
/>
<span>Continuous Recognition</span>
</div>
<div className='option-separator'></div>
<div className='switch'>
<Switch value={animation} onValueChanged={onAnimationValueChanged} />
<span>Animation</span>
</div>
</div>
</div>
);
}
import React, { useCallback, useState } from 'react';
import { SpeechToText } from 'devextreme-react/speech-to-text';
import { TextArea } from 'devextreme-react/text-area';
import { Button } from 'devextreme-react/button';
import { SelectBox } from 'devextreme-react/select-box';
import { Switch } from 'devextreme-react/switch';
import notify from 'devextreme/ui/notify';
import {
displayModes, stylingModes, types, languages, langMap,
} from './data.js';
let state = 'initial';
const textAreaLabel = { 'aria-label': 'Recognized Text' };
const displayModeLabel = { 'aria-label': 'Display Mode' };
const stylingModeLabel = { 'aria-label': 'Styling Mode' };
const typeLabel = { 'aria-label': 'Type' };
const languageLabel = { 'aria-label': 'Language' };
export default function App() {
const [startText, setStartText] = useState('');
const [stopText, setStopText] = useState('');
const [displayMode, setDisplayMode] = useState(displayModes[0]);
const [stylingMode, setStylingMode] = useState(stylingModes[0].value);
const [type, setType] = useState(types[2].value);
const [hint, setHint] = useState('Start voice recognition');
const [disabled, setDisabled] = useState(false);
const [textAreaValue, setTextAreaValue] = useState('');
const [language, setLanguage] = useState(languages[0]);
const [interimResults, setInterimResults] = useState(true);
const [continuous, setContinuous] = useState(false);
const [animation, setAnimation] = useState(true);
const speechRecognitionConfig = {
lang: langMap[language],
interimResults,
continuous,
};
const onStartClick = useCallback(() => {
if (!window.SpeechRecognition && !window.webkitSpeechRecognition) {
notify({
message: 'The browser does not support Web Speech API (SpeechRecognition).',
type: 'error',
displayTime: 7000,
position: 'bottom center',
width: 'auto',
});
return;
}
state = 'listening';
setHint('Stop voice recognition');
if (displayMode !== 'Custom') {
return;
}
setType('danger');
}, [displayMode]);
const onEnd = useCallback(() => {
state = 'initial';
setHint('Start voice recognition');
if (displayMode !== 'Custom') {
return;
}
setType('default');
}, [displayMode]);
const onResult = useCallback(({ event }) => {
const { results } = event;
const resultText = Object.values(results)
.map((resultItem) => resultItem[0].transcript.trim())
.join(' ');
setTextAreaValue(resultText);
}, []);
const onTextAreaValueChanged = useCallback(({ value }) => {
setTextAreaValue(value);
}, []);
const onClearButtonClick = useCallback(() => {
setTextAreaValue('');
}, []);
const onDisplayModeValueChanged = useCallback(({ value }) => {
setDisplayMode(value);
if (value === 'Text and Icon') {
setStartText('Dictate');
setStopText('Stop');
return;
}
setStartText('');
setStopText('');
if (value === 'Custom') {
setStylingMode('contained');
setType(state === 'initial' ? 'default' : 'danger');
}
}, []);
const onStylingModeValueChanged = useCallback(({ value }) => {
setStylingMode(value);
}, []);
const onTypeValueChanged = useCallback(({ value }) => {
setType(value);
}, []);
const onDisabledValueChanged = useCallback(({ value }) => {
setDisabled(value);
}, []);
const onLanguageValueChanged = useCallback(({ value }) => {
setLanguage(value);
}, []);
const onInterimResultsValueChanged = useCallback(({ value }) => {
setInterimResults(value);
}, []);
const onContinuousValueChanged = useCallback(({ value }) => {
setContinuous(value);
}, []);
const onAnimationValueChanged = useCallback(({ value }) => {
setAnimation(value);
}, []);
return (
<div className="speech-to-text-demo">
<div className="speech-to-text-container">
<span>Use voice recognition (speech to text)</span>
<SpeechToText
id="speech-to-text"
className={`${!animation ? 'animation-disabled' : ''} ${
displayMode === 'Custom' ? 'custom-button' : ''
}`}
startText={startText}
stopText={stopText}
stylingMode={stylingMode}
type={type}
hint={hint}
speechRecognitionConfig={speechRecognitionConfig}
disabled={disabled}
onStartClick={onStartClick}
onStopClick={onEnd}
onEnd={onEnd}
onResult={onResult}
/>
<TextArea
id="text-area"
value={textAreaValue}
width={360}
height={120}
placeholder="Recognized text will appear here..."
inputAttr={textAreaLabel}
onValueChanged={onTextAreaValueChanged}
/>
<Button
text="Clear"
disabled={textAreaValue === ''}
onClick={onClearButtonClick}
/>
</div>
<div className="options">
<div className="caption">Options</div>
<div className="option">
<div>Display Mode</div>
<SelectBox
value={displayMode}
dataSource={displayModes}
inputAttr={displayModeLabel}
onValueChanged={onDisplayModeValueChanged}
/>
</div>
<div className="option">
<div>Styling Mode</div>
<SelectBox
value={stylingMode}
dataSource={stylingModes}
valueExpr="value"
displayExpr="displayValue"
disabled={displayMode === 'Custom'}
inputAttr={stylingModeLabel}
onValueChanged={onStylingModeValueChanged}
/>
</div>
<div className="option">
<div>Type</div>
<SelectBox
value={type}
dataSource={types}
valueExpr="value"
displayExpr="displayValue"
disabled={displayMode === 'Custom'}
inputAttr={typeLabel}
onValueChanged={onTypeValueChanged}
/>
</div>
<div className="switch">
<Switch
value={disabled}
onValueChanged={onDisabledValueChanged}
/>
<span>Disabled</span>
</div>
<div className="option-separator"></div>
<div className="option">
<div>Language</div>
<SelectBox
value={language}
dataSource={languages}
inputAttr={languageLabel}
onValueChanged={onLanguageValueChanged}
/>
</div>
<div className="switch">
<Switch
value={interimResults}
onValueChanged={onInterimResultsValueChanged}
/>
<span>Interim Results</span>
</div>
<div className="switch">
<Switch
value={continuous}
onValueChanged={onContinuousValueChanged}
/>
<span>Continuous Recognition</span>
</div>
<div className="option-separator"></div>
<div className="switch">
<Switch
value={animation}
onValueChanged={onAnimationValueChanged}
/>
<span>Animation</span>
</div>
</div>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import themes from 'devextreme/ui/themes';
import App from './App.tsx';
themes.initialized(() => {
ReactDOM.render(
<App />,
document.getElementById('app'),
);
});
import type { ButtonTypes } from 'devextreme-react/button';
export const displayModes = ['Icon Only', 'Text and Icon', 'Custom'];
export const stylingModes: { displayValue: string; value: ButtonTypes.ButtonStyle }[] = [
{
displayValue: 'Contained',
value: 'contained',
},
{
displayValue: 'Outlined',
value: 'outlined',
},
{
displayValue: 'Text',
value: 'text',
},
];
export const types: { displayValue: string; value: ButtonTypes.ButtonType }[] = [
{
displayValue: 'Normal',
value: 'normal',
},
{
displayValue: 'Success',
value: 'success',
},
{
displayValue: 'Default',
value: 'default',
},
{
displayValue: 'Danger',
value: 'danger',
},
];
export const langMap = {
"Auto-detect": '',
"English": 'en-US',
"Spanish": 'es-ES',
"French": 'fr-FR',
"German": 'de-DE',
};
export type Language = keyof typeof langMap;
export const languages: readonly Language[] = Object.keys(langMap) as Language[];
import React from 'react';
import ReactDOM from 'react-dom';
import themes from 'devextreme/ui/themes';
import App from './App.js';
themes.initialized(() => {
ReactDOM.render(<App />, document.getElementById('app'));
});
export const displayModes = ['Icon Only', 'Text and Icon', 'Custom'];
export const stylingModes = [
{
displayValue: 'Contained',
value: 'contained',
},
{
displayValue: 'Outlined',
value: 'outlined',
},
{
displayValue: 'Text',
value: 'text',
},
];
export const types = [
{
displayValue: 'Normal',
value: 'normal',
},
{
displayValue: 'Success',
value: 'success',
},
{
displayValue: 'Default',
value: 'default',
},
{
displayValue: 'Danger',
value: 'danger',
},
];
export const langMap = {
'Auto-detect': '',
English: 'en-US',
Spanish: 'es-ES',
French: 'fr-FR',
German: 'de-DE',
};
export const languages = Object.keys(langMap);
<!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>
.speech-to-text-demo {
display: flex;
gap: 20px;
height: 640px;
}
.speech-to-text-container {
display: flex;
flex-direction: column;
row-gap: 16px;
flex-grow: 1;
align-items: center;
justify-content: center;
}
#text-area {
margin-top: 16px;
}
.options {
display: flex;
flex-direction: column;
flex-shrink: 0;
width: 300px;
box-sizing: border-box;
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
gap: 16px;
}
.caption {
font-weight: 500;
font-size: 18px;
}
.option {
display: flex;
flex-direction: column;
row-gap: 4px;
}
.switch {
display: flex;
align-items: center;
column-gap: 8px;
}
.option-separator {
border-bottom: 1px solid var(--dx-color-border);
}
#speech-to-text.animation-disabled {
animation: none;
}
#speech-to-text.custom-button {
border-radius: 2rem;
}
You can integrate SpeechToText with any text input, including editors available in the DevExtreme product line. Simply set a component's value property to transcribed text. SpeechToText returns transcribed text in the onResult handler as a user speaks. When speech stops, the component calls the onEnd handler and switches from a "listening" state to the initial state. SpeechToText implements state-dependent icons (startIcon/stopIcon), text (startText/stopText), and click handlers (onStartClick/onStopClick).
For a complete overview of SpeechToText options (including Web Speech API options), refer to the following topic: SpeechToText API Reference.