Custom Axis Labels (React)

The Axis class has an itemFormatter property that allows you to customize the content and appearance of specific labels along the axes.

If specified, the itemFormatter function takes two parameters:

  1. engine: The IRenderEngine object used for rendering the labels.
  2. label: An object that represents the label and has these properties:
    • value: The value that the label represents.
    • text: The text content of the label (usually the formatted value).
    • pos: The position where the label will be rendered, in control coordinates.
    • cls: A CSS class to be applied to the label element.

Learn about FlexChart | Axis Label 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 from 'react'; import useEvent from 'react-use-event-hook'; import * as Chart from '@mescius/wijmo.react.chart'; import './app.css'; import { data, palette } from './data'; function App() { const itemFormatter = useEvent((_, label) => { if (label.val >= 10000000) { label.cls = 'high-value'; } else if (label.val < 5000000) { label.cls = 'low-value'; } return label; }); return (<div className="container"> <div className="form-group"> <Chart.FlexChart header="Country GDP" bindingX="country" itemsSource={data} palette={palette}> <Chart.FlexChartAxis wjProperty="axisY" itemFormatter={itemFormatter}/> <Chart.FlexChartSeries name="2014" binding="2014"/> <Chart.FlexChartSeries name="2015" binding="2015"/> <Chart.FlexChartSeries name="2016" binding="2016"/> </Chart.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 Custom Axis Labels/Formatted Labels</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>
.high-value { fill: darkgreen; font-weight: bold; } .low-value { fill: darkred; }
import { isArray } from '@mescius/wijmo'; import { Palettes } from '@mescius/wijmo.chart'; function getData() { return [ { country: 'United States', '2014': 17348075, '2015': 18036650, '2016': 18624450 }, { country: 'China', '2014': 10356508, '2015': 11181556, '2016': 11232110 }, { country: 'Japan', '2014': 4602367, '2015': 4124211, '2016': 4936540 }, { country: 'Germany', '2014': 3874437, '2015': 3365293, '2016': 3479230 }, { country: 'United Kingdom', '2014': 2950039, '2015': 2858482, '2016': 2629190 }, { country: 'France', '2014': 2833687, '2015': 2420163, '2016': 2466470 }, { country: 'India', '2014': 2051228, '2015': 2073002, '2016': 2263790 }, { country: 'Italy', '2014': 2147744, '2015': 1815759, '2016': 1850740 } ]; } 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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