Multiple Axes (React)

Most charts have two axes, X and Y. This works well as long as all the data on the chart has the same nature and can share the same scale.

But some charts contain series that show different types of data, with different units and scales. The FlexChart below has two series that represent amounts (sales and expenses) and one that represents quantities (downloads).

Plotting all the series against a single Y axis squeezes the first two series against the bottom of the chart.

The easiest way to solve this problem and still using a single chart is to create a secondary Y axis and assign it to the axisY property of the "Downloads" series.

Learn about FlexChart | Multiple Axes Documentation | FlexChart API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useRef } from 'react'; import useEvent from 'react-use-event-hook'; import * as wjChart from '@mescius/wijmo.react.chart'; import './app.css'; import { data, palette } from './data'; function App() { const serRef = useRef(null); const axisYRef = useRef(null); const initializeChart = useEvent((flex) => { serRef.current = flex.series[2]; setTimeout(() => { axisYRef.current = serRef.current.axisY; }, 350); }); const saChange = (sa) => { serRef.current.axisY = sa.target.checked ? axisYRef.current : null; }; return (<div className="container-fluid"> <div className="form-group"> <label htmlFor="secondaryAxis">Secondary Y Axis</label> <input id="secondaryAxis" type="checkbox" defaultChecked onClick={saChange}/> <wjChart.FlexChart bindingX="country" initialized={initializeChart} itemsSource={data} palette={palette}> <wjChart.FlexChartSeries binding="sales" name="Sales"/> <wjChart.FlexChartSeries binding="expenses" name="Expenses"/> <wjChart.FlexChartSeries binding="downloads" name="Downloads" chartType="LineSymbols"> <wjChart.FlexChartAxis wjProperty="axisY" position="Right" title="Downloads (k)" format="n0," min={0} axisLine={true}/> </wjChart.FlexChartSeries> <wjChart.FlexChartAxis wjProperty="axisY" format="n0," title="Sales/Expenses (US$ k)" axisLine={true}/> </wjChart.FlexChart> </div> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo Wijmo FlexChart Multiple Axes</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
label { margin-right: 3px; }
import { isArray } from '@mescius/wijmo'; import { Palettes } from '@mescius/wijmo.chart'; function getData() { let countries = 'US,Canada,Mexico,Germany,UK,France,Italy,Japan,Korea,China'.split(','), data = []; // for (let i = 0; i < countries.length; i++) { data.push({ country: countries[i], sales: 1000 + Math.random() * 10000, expenses: 1000 + Math.random() * 5000, downloads: Math.round(Math.random() * 100000) }); } // return data; } function getRandomPalette() { let palettes = Object.keys(Palettes).filter(prop => isArray(Palettes[prop])); let rand = Math.floor(Math.random() * palettes.length); // return Palettes[palettes[rand]]; } export const data = getData(); export const palette = getRandomPalette();
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