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Charts

API - Display a Tooltip

Documentation

This demo illustrates how to show and hide the point’s tooltip with the API. To test this feature, select a continent from the drop-down menu under the PieChart or click a point directly in the PieChart.

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import React from 'react'; import PieChart, { Series, Tooltip, Size, Legend } from 'devextreme-react/pie-chart'; import { SelectBox } from 'devextreme-react/select-box'; import { populationData } from './data.js'; class App extends React.Component { constructor(props) { super(props); this.state = { selectedRegion: null }; this.pieChartRef = React.createRef(); this.onPointClick = this.onPointClick.bind(this); this.onRegionChanged = this.onRegionChanged.bind(this); } render() { return ( <React.Fragment> <PieChart ref={this.pieChartRef} dataSource={populationData} onPointClick={this.onPointClick} type="doughnut" palette="Soft Pastel" title="The Population of Continents and Regions" > <Series argumentField="region" /> <Size height={350} /> <Tooltip enabled={false} format="millions" customizeTooltip={customizeTooltip} /> <Legend visible={false} /> </PieChart> <div className="controls-pane"> <SelectBox width={250} dataSource={populationData} displayExpr="region" valueExpr="region" placeholder="Choose region" value={this.state.selectedRegion} onValueChanged={this.onRegionChanged} /> </div> </React.Fragment> ); } get pieChart() { return this.pieChartRef.current.instance; } onPointClick({ target: point }) { this.showTooltip(point); } onRegionChanged({ value }) { const point = this.pieChart.getAllSeries()[0].getPointsByArg(value)[0]; this.showTooltip(point); } showTooltip(point) { point.showTooltip(); this.setState({ selectedRegion: point.argument }); } } function customizeTooltip(pointInfo) { return { text: `${pointInfo.argumentText}<br/>${pointInfo.valueText}` }; } 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="stylesheet" type="text/css" 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>
.controls-pane { margin-top: 20px; text-align: center; } .dx-selectbox { display: inline-block; }
export const populationData = [{ region: 'Asia', val: 4119626293 }, { region: 'Africa', val: 1012956064 }, { region: 'Northern America', val: 344124520 }, { region: 'Latin America and the Caribbean', val: 590946440 }, { region: 'Europe', val: 727082222 }, { region: 'Oceania', val: 35104756 }];
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', 'devexpress-diagram': 'npm:devexpress-diagram', 'stackblur-canvas': 'npm:stackblur-canvas', 'rgbcolor': 'npm:rgbcolor', 'canvg': 'npm:canvg', // 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 } });