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Bar Charts

Customize Points and Labels

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This demo shows how you can customize individual points and labels in the Chart.

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import React from 'react'; import { Chart, Series, Legend, ValueAxis, VisualRange, Label, ConstantLine, Export } from 'devextreme-react/chart'; import { temperaturesData } from './data.js'; class App extends React.Component { constructor(props) { super(props); this.state = { highAverage: 77, lowAverage: 58 }; this.customizeLabel = this.customizeLabel.bind(this); this.customizePoint = this.customizePoint.bind(this); } render() { return ( <Chart id="chart" title="Daily Temperature in May" dataSource={temperaturesData} customizePoint={this.customizePoint} customizeLabel={this.customizeLabel} > <Series argumentField="day" valueField="value" type="bar" color="#e7d19a" /> <ValueAxis maxValueMargin={0.01}> <VisualRange startValue={40} /> <Label customizeText={this.customizeText} /> <ConstantLine width={2} value={this.state.lowAverage} color="#8c8cff" dashStyle="dash" > <Label text="Low Average" /> </ConstantLine> <ConstantLine width={2} value={this.state.highAverage} color="#ff7c7c" dashStyle="dash" > <Label text="High Average" /> </ConstantLine> </ValueAxis> <Legend visible={false} /> <Export enabled={true} /> </Chart> ); } customizePoint(arg) { if (arg.value > this.state.highAverage) { return { color: '#ff7c7c', hoverStyle: { color: '#ff7c7c' } }; } else if (arg.value < this.state.lowAverage) { return { color: '#8c8cff', hoverStyle: { color: '#8c8cff' } }; } } customizeLabel(arg) { if (arg.value > this.state.highAverage) { return { visible: true, backgroundColor: '#ff7c7c', customizeText: function(e) { return `${e.valueText }&#176F`; } }; } } customizeText(arg) { return `${arg.valueText }&#176F`; } } 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>
#chart { height: 440px; width: 100%; }
export const temperaturesData = [{ day: '1', value: 57 }, { day: '2', value: 58 }, { day: '3', value: 57 }, { day: '4', value: 59 }, { day: '5', value: 63 }, { day: '6', value: 63 }, { day: '7', value: 63 }, { day: '8', value: 64 }, { day: '9', value: 64 }, { day: '10', value: 64 }, { day: '11', value: 69 }, { day: '12', value: 72 }, { day: '13', value: 75 }, { day: '14', value: 78 }, { day: '15', value: 76 }, { day: '16', value: 70 }, { day: '17', value: 65 }, { day: '18', value: 65 }, { day: '19', value: 68 }, { day: '20', value: 70 }, { day: '21', value: 73 }, { day: '22', value: 73 }, { day: '23', value: 75 }, { day: '24', value: 78 }, { day: '25', value: 76 }, { day: '26', value: 76 }, { day: '27', value: 80 }, { day: '28', value: 76 }, { day: '29', value: 75 }, { day: '30', value: 75 }, { day: '31', value: 74 }];
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 } });