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Charts

Error Bars

Documentation

If your data contains an error or measurement uncertainty, you can indicate a confidential interval on the Chart using error bars. To configure them, use the fields of the series’ valueErrorBar object. In this example, error bars indicate a range of average temperatures (on the upper pane) and humidity (on the lower pane) for a specific month.

www.weatherbase.com
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import React from 'react'; import Chart, { CommonSeriesSettings, Series, ValueErrorBar, Pane, ArgumentAxis, ValueAxis, Export, Legend, Label, Title, Tooltip, Grid } from 'devextreme-react/chart'; import { weatherData } from './data.js'; class App extends React.Component { render() { return ( <Chart id="chart" dataSource={weatherData} defaultPane="bottom" > <CommonSeriesSettings argumentField="month" /> <Series pane="top" valueField="avgT" name="Average Temperature, °C" > <ValueErrorBar lowValueField="avgLowT" highValueField="avgHighT" lineWidth={1} opacity={0.8} /> </Series> <Series pane="bottom" valueField="avgH" type="bar" name="Average Humidity, %" > <ValueErrorBar type="fixed" value={3} lineWidth={1} /> </Series> <Pane name="top" /> <Pane name="bottom" /> <ArgumentAxis> <Label displayMode="stagger" /> </ArgumentAxis> <ValueAxis pane="top"> <Grid visible={true} /> <Title text="Temperature, °C" /> </ValueAxis> <ValueAxis tickInterval={50} pane="bottom" > <Grid visible={true} /> <Title text="Humidity, %" /> </ValueAxis> <Legend verticalAlignment="bottom" horizontalAlignment="center" /> <Export enabled={true} /> <Tooltip enabled={true} customizeTooltip={customizeTooltip} /> <Title text="Weather in Los Angeles, California" /> </Chart> ); } } function customizeTooltip(pointInfo) { return { text: `${pointInfo.seriesName}: ${pointInfo.value } (range: ${pointInfo.lowErrorValue } - ${pointInfo.highErrorValue})` }; } 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; }
export const weatherData = [{ month: 'January', avgT: 14.1, avgLowT: 9.1, avgHighT: 19.1, avgH: 70 }, { month: 'February', avgT: 14.7, avgLowT: 9.8, avgHighT: 19.6, avgH: 74 }, { month: 'March', avgT: 15.6, avgLowT: 10.6, avgHighT: 20.4, avgH: 79 }, { month: 'April', avgT: 16.8, avgLowT: 11.9, avgHighT: 21.7, avgH: 80 }, { month: 'May', avgT: 18.2, avgLowT: 13.6, avgHighT: 22.7, avgH: 83 }, { month: 'June', avgT: 20.2, avgLowT: 15.4, avgHighT: 25, avgH: 85 }, { month: 'July', avgT: 22.6, avgLowT: 17.3, avgHighT: 27.9, avgH: 86 }, { month: 'August', avgT: 23, avgLowT: 17.7, avgHighT: 28.4, avgH: 86 }, { month: 'September', avgT: 22.3, avgLowT: 17, avgHighT: 27.7, avgH: 83 }, { month: 'October', avgT: 20.1, avgLowT: 14.8, avgHighT: 25.3, avgH: 79 }, { month: 'November', avgT: 17.2, avgLowT: 11.8, avgHighT: 22.7, avgH: 72 }, { month: 'December', avgT: 14.6, avgLowT: 9.5, avgHighT: 19.7, avgH: 68 }];
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 } });