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.

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Backend API

<template> <DxChart id="chart" :data-source="weatherData" default-pane="bottom" > <DxCommonSeriesSettings argument-field="month"/> <DxSeries pane="top" value-field="avgT" name="Average Temperature, °C" > <DxValueErrorBar :line-width="1" :opacity="0.8" low-value-field="avgLowT" high-value-field="avgHighT" /> </DxSeries> <DxSeries pane="bottom" value-field="avgH" type="bar" name="Average Humidity, %" > <DxValueErrorBar :value="3" :line-width="1" type="fixed" /> </DxSeries> <DxPane name="top"/> <DxPane name="bottom"/> <DxArgumentAxis> <DxLabel display-mode="stagger"/> </DxArgumentAxis> <DxValueAxis pane="top"> <DxGrid :visible="true"/> <DxTitle text="Temperature, °C"/> </DxValueAxis> <DxValueAxis :tick-interval="50" pane="bottom" > <DxGrid :visible="true"/> <DxTitle text="Humidity, %"/> </DxValueAxis> <DxLegend vertical-alignment="bottom" horizontal-alignment="center" /> <DxExport :enabled="true"/> <DxTooltip :enabled="true" :customize-tooltip="customizeTooltip" /> <DxTitle text="Weather in Los Angeles, California"/> </DxChart> </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 { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#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/23.1.5/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.6.12/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, }];