Tooltip and Legend

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This demo shows how to enable and customize tooltips in the the BarGauge widget. A tooltip is a small pop-up rectangle that displays the value of the bar that is currently hovered over. To enable the tooltips, the enabled option is set to true. The text displayed by the tooltips is customized using the customizeText option.

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import React from 'react'; import { BarGauge, Label, Tooltip, Export, Title, Font, Legend } from 'devextreme-react/bar-gauge'; const values = [121.4, 135.4, 115.9, 141.1, 127.5]; class App extends React.Component { render() { return ( <BarGauge id="gauge" startValue={0} endValue={200} defaultValues={values} > <Label visible={false} /> <Tooltip enabled={true} customizeTooltip={this.customizeTooltip} /> <Export enabled={true} /> <Title text="Average Speed by Racer"> <Font size={28} /> </Title> <Legend visible={true} customizeText={this.customizeText} verticalAlignment="bottom" horizontalAlignment="center" /> </BarGauge> ); } customizeTooltip(arg) { return { text: getText(arg, arg.valueText) }; } customizeText(arg) { return getText(arg.item, arg.text); } } function getText(item, text) { return `Racer ${(item.index + 1)} - ${text} km/h`; } export default App;

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

<!DOCTYPE html> <html> <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=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.common.css" /> <link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" /> <link rel="stylesheet" type ="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.4.1/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.js'); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>

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

System.config({ transpiler: 'plugin-babel', paths: { 'npm:': 'https://unpkg.com/' }, defaultExtension: 'js', map: { 'react': 'npm:react@16/umd/react.development.js', 'react-dom': 'npm:react-dom@16/umd/react-dom.development.js', 'prop-types': 'npm:prop-types/prop-types.js', 'devextreme': 'npm:devextreme@19.2', 'devextreme-react': 'npm:devextreme-react@19.2', 'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.7/dist/quill.js', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, packages: { 'devextreme': { defaultExtension: 'js' }, 'devextreme-react': { main: 'index.js' } }, babelOptions: { sourceMaps: false, stage0: true, react: true } });