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Charts

Custom Legend Markers

Legend markers are SVG elements. To customize a legend marker, declare the SVG markup in the markerTemplate. You can access the legend item data object inside the template and use it to identify the series and read its parameters.

In this demo, the markers' appearance changes when you click the markers to show or hide the corresponding series.

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import React from 'react'; import { Chart, Series, CommonSeriesSettings, Point, Legend } from 'devextreme-react/chart'; import { dataSource } from './data.js'; import markerTemplate from './MarkerTemplate.js'; class App extends React.Component { onLegendClick(e) { e.target.isVisible() ? e.target.hide() : e.target.show(); } render() { return ( <Chart id="chart" title="Noisy and Original Signals" dataSource={dataSource} onLegendClick={this.onLegendClick}> <CommonSeriesSettings argumentField="argument"> <Point visible={false}></Point> </CommonSeriesSettings> <Series valueField="originalValue" name="Original Signal" /> <Series valueField="value" name="Noisy Signal" /> <Legend verticalAlignment="bottom" horizontalAlignment="center" markerRender={markerTemplate} > </Legend> </Chart> ); } } export default App;
import React from 'react'; var markerPath = { 'Original Signal': 'M 0 8 C 2 4 7 4 9.5 8 C 11 12 16 12 18 8 L 18 10 C 16 14 11 14 8.5 10 C 7 6 2 6 0 10 Z', 'Noisy Signal': 'M 18 8 L 12 12 L 7 3 L 0 7.4 L 0 10 L 6 6 L 11 15 L 18 10.6 Z' }; export default function MarkerTemplate(item) { var color = item.series.isVisible() ? item.marker.fill : '#888'; return ( <svg> <rect x={0} y={0} width={18} height={18} fill={color} opacity={0.3}></rect> <path d={markerPath[item.series.name]} fill={color}></path> </svg> ); }
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>
#chart { height: 440px; }
function generateData(start, end, step) { const data = []; for (let i = start; i < end; i += step) { const originalValue = Math.sin(i) / i; data.push({ value: originalValue + ((0.5 - Math.random()) / 10), originalValue: originalValue, argument: i }); } return data; } export const dataSource = generateData(2.5, 12, 0.1);
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', 'devexpress-gantt': 'npm:devexpress-gantt', // 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 } });