Multiple Axes

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

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import { isArray } from '@grapecity/wijmo'; import { FlexChart, Axis, Position, Palettes } from '@grapecity/wijmo.chart'; import { getData } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // create the chart let theChart = new FlexChart('#theChart', { itemsSource: getData(), bindingX: 'country', series: [ { binding: 'sales', name: 'Sales' }, { binding: 'expenses', name: 'Expenses' }, { binding: 'downloads', name: 'Downloads', chartType: 'LineSymbols' } ], axisY: { format: 'n0,', title: 'Sales/Expenses (US$ k)', axisLine: true }, }); theChart.palette = getRandomPalette(); // // create and apply extra Y axis for 'Downloads' series let axisY2 = new Axis(); axisY2.position = Position.Right; axisY2.title = 'Downloads (k)'; axisY2.format = 'n0,'; axisY2.min = 0; axisY2.axisLine = true; getSeries('downloads').axisY = axisY2; // // toggle extra axis document.querySelector('#secondaryAxis').addEventListener('click', e => { getSeries('downloads').axisY = e.target.checked ? axisY2 : null; }); // // get a series by its binding function getSeries(binding) { let s = theChart.series; // for (let i = 0; i < s.length; i++) { if (s[i].binding == binding) { return s[i]; } } // return null; } } // function getRandomPalette() { let palettes = Object.getOwnPropertyNames(Palettes).filter(prop => isArray(Palettes[prop])); let rand = Math.floor(Math.random() * palettes.length); // return Palettes[palettes[rand]]; }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexChart Multiple Axes</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div class="container-fluid"> <label for="secondaryAxis">Secondary Y Axis</label> <input id="secondaryAxis" type="checkbox" checked="checked"> <div id="theChart"></div> </div> </body> </html>
// create some random data export 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; }
.wj-flexchart { height: 300px; } .wj-control { margin-bottom: 6px; } body { margin-bottom: 24pt; }
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