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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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<template> <dx-chart id="chart" :data-source="weatherData" default-pane="bottom" > <dx-common-series-settings argument-field="month"/> <dx-series pane="top" value-field="avgT" name="Average Temperature, °C" > <dx-value-error-bar :line-width="1" :opacity="0.8" low-value-field="avgLowT" high-value-field="avgHighT" /> </dx-series> <dx-series pane="bottom" value-field="avgH" type="bar" name="Average Humidity, %" > <dx-value-error-bar :value="3" :line-width="1" type="fixed" /> </dx-series> <dx-pane name="top"/> <dx-pane name="bottom"/> <dx-argument-axis> <dx-label display-mode="stagger"/> </dx-argument-axis> <dx-value-axis pane="top"> <dx-grid :visible="true"/> <dx-title text="Temperature, °C"/> </dx-value-axis> <dx-value-axis :tick-interval="50" pane="bottom" > <dx-grid :visible="true"/> <dx-title text="Humidity, %"/> </dx-value-axis> <dx-legend vertical-alignment="bottom" horizontal-alignment="center" /> <dx-export :enabled="true"/> <dx-tooltip :enabled="true" :customize-tooltip="customizeTooltip" /> <dx-title text="Weather in Los Angeles, California"/> </dx-chart> </template> <script> import DxChart, { DxCommonSeriesSettings, DxSeries, DxValueErrorBar, DxPane, DxArgumentAxis, DxValueAxis, DxExport, DxLegend, DxLabel, DxTitle, DxTooltip, DxGrid } from 'devextreme-vue/chart'; import { weatherData } from './data.js'; export default { components: { DxChart, DxCommonSeriesSettings, DxSeries, DxValueErrorBar, DxPane, DxArgumentAxis, DxValueAxis, DxExport, DxLegend, DxLabel, DxTitle, DxTooltip, DxGrid }, data() { return { weatherData }; }, methods: { customizeTooltip(pointInfo) { return { text: `${pointInfo.seriesName}: ${pointInfo.value } (range: ${pointInfo.lowErrorValue } - ${pointInfo.highErrorValue})` }; } } }; </script> <style> #chart { height: 440px; } </style>
import Vue from 'vue'; import App from './App.vue'; new Vue({ el: '#app', components: { App }, template: '<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" /> <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>
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/' }, map: { vue: 'npm:vue@2.6.3/dist/vue.esm.browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@latest/index.js', 'devextreme': 'npm:devextreme@19.2', 'devextreme-vue': 'npm:devextreme-vue@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', 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, meta: { '*.vue': { loader: 'vue-loader' } }, packages: { 'devextreme-vue': { main: 'index.js' }, 'devextreme': { defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true } });