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Value Indicators API

This demo shows how to use the API of the CircularGauge to change its value and subvalue indicators at runtime. To get and set the values of the indicators, the value and subvalues methods are utilized.

Backend API
import React, { useCallback, useMemo, useRef, useState, } from 'react'; import { CircularGauge, Scale, Label, Tooltip, Title, Font, } from 'devextreme-react/circular-gauge'; import { NumberBox } from 'devextreme-react/number-box'; import { Button } from 'devextreme-react/button'; const mainGeneratorLabel = { 'aria-label': 'Main Generator' }; const additionalGeneratorOneLabel = { 'aria-label': 'Additional Generator One' }; const additionalGeneratorTwoLabel = { 'aria-label': 'Additional Generator Two' }; function customizeText({ valueText }) { return `${valueText} kV`; } function App() { const [mainGeneratorValue, setMainGeneratorValue] = useState(34); const [additionalGenerator1Value, setAdditionalGenerator1Value] = useState(12); const [additionalGenerator2Value, setAdditionalGenerator2Value] = useState(23); const gaugeRef = useRef(null); const updateValues = useCallback(() => { const gauge = gaugeRef.current.instance(); gauge.value(mainGeneratorValue); gauge.subvalues([additionalGenerator1Value, additionalGenerator2Value]); }, [ gaugeRef, mainGeneratorValue, additionalGenerator1Value, additionalGenerator2Value, ]); const defaultSubvalues = useMemo( () => [additionalGenerator1Value, additionalGenerator2Value], [additionalGenerator1Value, additionalGenerator2Value], ); return ( <div id="gauge-demo"> <div className="widget-container"> <CircularGauge id="gauge" defaultValue={mainGeneratorValue} defaultSubvalues={defaultSubvalues} ref={gaugeRef} > <Scale startValue={10} endValue={40} tickInterval={5}> <Label customizeText={customizeText} /> </Scale> <Tooltip enabled={true} /> <Title text="Generators Voltage (kV)"> <Font size={28} /> </Title> </CircularGauge> </div> <div className="options"> <div className="caption">Options</div> <div className="option"> <span>Main generator</span>&nbsp; <NumberBox id="main-generator" value={mainGeneratorValue} onValueChange={setMainGeneratorValue} min={10} max={40} width={100} showSpinButtons={true} inputAttr={mainGeneratorLabel} /> </div> <div className="option"> <span>Additional generator 1</span>&nbsp; <NumberBox id="additional-generator-one" value={additionalGenerator1Value} onValueChange={setAdditionalGenerator1Value} min={10} max={40} width={100} showSpinButtons={true} inputAttr={additionalGeneratorOneLabel} /> </div> <div className="option"> <span>Additional generator 2</span>&nbsp; <NumberBox id="additional-generator-two" value={additionalGenerator2Value} onValueChange={setAdditionalGenerator2Value} min={10} max={40} width={100} showSpinButtons={true} inputAttr={additionalGeneratorTwoLabel} /> </div> <div className="option"> <Button id="edit" width={100} text="Apply" onClick={updateValues} /> </div> </div> </div> ); } export default App;
import React, { useCallback, useMemo, useRef, useState, } from 'react'; import { CircularGauge, Scale, Label, Tooltip, Title, Font, } from 'devextreme-react/circular-gauge'; import { NumberBox } from 'devextreme-react/number-box'; import { Button } from 'devextreme-react/button'; const mainGeneratorLabel = { 'aria-label': 'Main Generator' }; const additionalGeneratorOneLabel = { 'aria-label': 'Additional Generator One' }; const additionalGeneratorTwoLabel = { 'aria-label': 'Additional Generator Two' }; function customizeText({ valueText }) { return `${valueText} kV`; } function App() { const [mainGeneratorValue, setMainGeneratorValue] = useState(34); const [additionalGenerator1Value, setAdditionalGenerator1Value] = useState(12); const [additionalGenerator2Value, setAdditionalGenerator2Value] = useState(23); const gaugeRef = useRef(null); const updateValues = useCallback(() => { const gauge = gaugeRef.current.instance(); gauge.value(mainGeneratorValue); gauge.subvalues([additionalGenerator1Value, additionalGenerator2Value]); }, [gaugeRef, mainGeneratorValue, additionalGenerator1Value, additionalGenerator2Value]); const defaultSubvalues = useMemo( () => [additionalGenerator1Value, additionalGenerator2Value], [additionalGenerator1Value, additionalGenerator2Value], ); return ( <div id="gauge-demo"> <div className="widget-container"> <CircularGauge id="gauge" defaultValue={mainGeneratorValue} defaultSubvalues={defaultSubvalues} ref={gaugeRef} > <Scale startValue={10} endValue={40} tickInterval={5} > <Label customizeText={customizeText} /> </Scale> <Tooltip enabled={true} /> <Title text="Generators Voltage (kV)"> <Font size={28} /> </Title> </CircularGauge> </div> <div className="options"> <div className="caption">Options</div> <div className="option"> <span>Main generator</span>&nbsp; <NumberBox id="main-generator" value={mainGeneratorValue} onValueChange={setMainGeneratorValue} min={10} max={40} width={100} showSpinButtons={true} inputAttr={mainGeneratorLabel} /> </div> <div className="option"> <span>Additional generator 1</span>&nbsp; <NumberBox id="additional-generator-one" value={additionalGenerator1Value} onValueChange={setAdditionalGenerator1Value} min={10} max={40} width={100} showSpinButtons={true} inputAttr={additionalGeneratorOneLabel} /> </div> <div className="option"> <span>Additional generator 2</span>&nbsp; <NumberBox id="additional-generator-two" value={additionalGenerator2Value} onValueChange={setAdditionalGenerator2Value} min={10} max={40} width={100} showSpinButtons={true} inputAttr={additionalGeneratorTwoLabel} /> </div> <div className="option"> <Button id="edit" width={100} text="Apply" onClick={updateValues} /> </div> </div> </div> ); } export default App;
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@24.1.3/cjs', 'devextreme-react': 'npm:devextreme-react@24.1.3/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@2.2.8/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="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/24.1.3/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>
.widget-container { margin-right: 320px; } .options { padding: 20px; background-color: rgba(191, 191, 191, 0.15); position: absolute; right: 0; top: 0; bottom: 0; width: 260px; } .caption { font-size: 18px; font-weight: 500; } .option { margin-top: 10px; display: flex; align-items: center; justify-content: space-between; } #edit { margin-left: auto; }