React Gauges - Variable Number of Subvalue Indicators

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

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TS JS

Backend API

import React, { useCallback, useState } from 'react'; import { LinearGauge, Scale, Label, Tooltip, Export, Title, Font, } from 'devextreme-react/linear-gauge'; import { SelectBox, type SelectBoxTypes } from 'devextreme-react/select-box'; import { dataSource, departmentLabel } from './data.ts'; function customizeText({ valueText }) { return `${valueText} kW`; } function customizeTooltip(arg: { valueText: string; index?: number; }) { let result = `${arg.valueText} kW`; if (arg.index >= 0) { result = `Secondary ${(arg.index + 1)}: ${result}`; } else { result = `Primary: ${result}`; } return { text: result, }; } function App() { const [value, setValue] = useState(dataSource[0].primary); const [subvalues, setSubvalues] = useState(dataSource[0].secondary); const onValueChanged = useCallback((e: SelectBoxTypes.ValueChangedEvent) => { setValue(e.value.primary); setSubvalues(e.value.secondary); }, [setValue, setSubvalues]); return ( <div id="gauge-demo"> <LinearGauge id="gauge" value={value} subvalues={subvalues} > <Scale startValue={0} endValue={10} tickInterval={2}> <Label customizeText={customizeText} /> </Scale> <Tooltip enabled={true} customizeTooltip={customizeTooltip} /> <Export enabled={true} /> <Title text="Power of Air Conditioners in Store Departments (kW)"> <Font size={28} /> </Title> </LinearGauge> <SelectBox id="selectbox" dataSource={dataSource} inputAttr={departmentLabel} defaultValue={dataSource[0]} width={200} displayExpr="name" onValueChanged={onValueChanged} /> </div> ); } export default App;

import React, { useCallback, useState } from 'react'; import { LinearGauge, Scale, Label, Tooltip, Export, Title, Font, } from 'devextreme-react/linear-gauge'; import { SelectBox } from 'devextreme-react/select-box'; import { dataSource, departmentLabel } from './data.js'; function customizeText({ valueText }) { return `${valueText} kW`; } function customizeTooltip(arg) { let result = `${arg.valueText} kW`; if (arg.index >= 0) { result = `Secondary ${arg.index + 1}: ${result}`; } else { result = `Primary: ${result}`; } return { text: result, }; } function App() { const [value, setValue] = useState(dataSource[0].primary); const [subvalues, setSubvalues] = useState(dataSource[0].secondary); const onValueChanged = useCallback( (e) => { setValue(e.value.primary); setSubvalues(e.value.secondary); }, [setValue, setSubvalues], ); return ( <div id="gauge-demo"> <LinearGauge id="gauge" value={value} subvalues={subvalues} > <Scale startValue={0} endValue={10} tickInterval={2} > <Label customizeText={customizeText} /> </Scale> <Tooltip enabled={true} customizeTooltip={customizeTooltip} /> <Export enabled={true} /> <Title text="Power of Air Conditioners in Store Departments (kW)"> <Font size={28} /> </Title> </LinearGauge> <SelectBox id="selectbox" dataSource={dataSource} inputAttr={departmentLabel} defaultValue={dataSource[0]} width={200} displayExpr="name" onValueChanged={onValueChanged} /> </div> ); } export default App;

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.tsx'; ReactDOM.render( <App />, document.getElementById('app'), );

export const dataSource = [{ name: 'Meat', primary: 8, secondary: [7, 3], }, { name: 'Fish', primary: 7, secondary: [7, 5, 1], }, { name: 'Grocery', primary: 5, secondary: [1, 3], }, { name: 'Greengrocery', primary: 3, secondary: [1], }, { name: 'Stationery', primary: 2, secondary: [], }]; export const departmentLabel = { 'aria-label': 'Department' };

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(<App />, document.getElementById('app'));

export const dataSource = [ { name: 'Meat', primary: 8, secondary: [7, 3], }, { name: 'Fish', primary: 7, secondary: [7, 5, 1], }, { name: 'Grocery', primary: 5, secondary: [1, 3], }, { name: 'Greengrocery', primary: 3, secondary: [1], }, { name: 'Stationery', primary: 2, secondary: [], }, ]; export const departmentLabel = { 'aria-label': 'Department' };

<!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/24.2.7/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/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>

#gauge-demo { height: 440px; width: 100%; } #gauge { height: 400px; }