Discrete scale

Documentation

In this demo, a discrete scale is used to select a range within a set of categories.

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Backend API

import React from 'react'; import RangeSelector, { Chart, Series } from 'devextreme-react/range-selector'; import { dataSource } from './data.js'; class App extends React.Component { constructor(props) { super(props); this.state = { totalProduction: calculateTotalProduction(), }; this.processRange = this.processRange.bind(this); } render() { return ( <div id="range-selector-demo"> <RangeSelector id="range-selector" title="Copper Production in 2013" dataSource={dataSource} onValueChanged={this.processRange} > <Chart> <Series type="bar" argumentField="country" valueField="copper" /> </Chart> </RangeSelector> <h2>Total: { this.state.totalProduction } tons</h2> </div> ); } processRange(e) { this.setState({ totalProduction: calculateTotalProduction(e.value), }); } } const formatNumber = new Intl.NumberFormat('en-US', { minimumFractionDigits: 0 }).format; function calculateTotalProduction(range = []) { let startIndex = 0; let endIndex = dataSource.length; dataSource.forEach((item, index) => { if (item.country === range[0]) { startIndex = index; } if (item.country === range[1]) { endIndex = index + 1; } }); return formatNumber(dataSource .slice(startIndex, endIndex) .reduce((total, item) => total + item.copper, 0)); } export default App;

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render( <App />, document.getElementById('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="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/23.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.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>

#range-selector-demo { text-align: center; } #range-selector { margin-bottom: 20px; height: 200px; }

export const dataSource = [ { country: 'Chile', copper: 5700000 }, { country: 'United States', copper: 1220000 }, { country: 'Peru', copper: 1300000 }, { country: 'China', copper: 1650000 }, { country: 'Australia', copper: 990000 }, { country: 'Russia', copper: 930000 }, { country: 'DR Congo', copper: 900000 }, { country: 'Finland', copper: 119000 }, ];