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Discrete scale

Documentation

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

Backend API
import React, { useCallback, useState } from 'react'; import RangeSelector, { Chart, RangeSelectorTypes, Series } from 'devextreme-react/range-selector'; import { dataSource } from './data.ts'; 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)); } function App() { const [totalProduction, setTotalProduction] = useState(calculateTotalProduction()); const processRange = useCallback((e: RangeSelectorTypes.ValueChangedEvent) => { setTotalProduction(calculateTotalProduction(e.value)); }, [setTotalProduction]); return ( <div id="range-selector-demo"> <RangeSelector id="range-selector" title="Copper Production in 2013" dataSource={dataSource} onValueChanged={processRange} > <Chart> <Series type="bar" argumentField="country" valueField="copper" /> </Chart> </RangeSelector> <h2>Total: {totalProduction} tons</h2> </div> ); } export default App;
import React, { useCallback, useState } from 'react'; import RangeSelector, { Chart, Series } from 'devextreme-react/range-selector'; import { dataSource } from './data.js'; 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), ); } function App() { const [totalProduction, setTotalProduction] = useState(calculateTotalProduction()); const processRange = useCallback( (e) => { setTotalProduction(calculateTotalProduction(e.value)); }, [setTotalProduction], ); return ( <div id="range-selector-demo"> <RangeSelector id="range-selector" title="Copper Production in 2013" dataSource={dataSource} onValueChanged={processRange} > <Chart> <Series type="bar" argumentField="country" valueField="copper" /> </Chart> </RangeSelector> <h2>Total: {totalProduction} tons</h2> </div> ); } export default App;
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.tsx'; ReactDOM.render( <App />, document.getElementById('app'), );
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 }, ];
window.exports = window.exports || {}; window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, jsx: 'react', }, meta: { 'react': { 'esModule': true, }, 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, defaultExtension: 'js', map: { 'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', 'react': 'npm:react@17.0.2/umd/react.development.js', 'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js', 'prop-types': 'npm:prop-types@15.8.1/prop-types.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@23.2.5/cjs', 'devextreme-react': 'npm:devextreme-react@23.2.5/cjs', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.6.4/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.5/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.51/dist/dx-gantt.js', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js', 'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.4/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.4/parser-html.js', }, packages: { 'devextreme': { defaultExtension: 'js', }, 'devextreme-react': { main: 'index.js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/localization/messages': { format: 'json', defaultExtension: '', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.12/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, react: true, }, }; System.config(window.config);
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(<App />, document.getElementById('app'));
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 }, ];
<!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/23.2.5/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.tsx"); </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; }