React Data Grid - Local Virtual Scrolling

import React, { useCallback, useState } from 'react'; import DataGrid, { Scrolling, Sorting, LoadPanel } from 'devextreme-react/data-grid'; import { generateData } from './data.js'; const dataSource = generateData(100000); const customizeColumns = (columns) => { columns[0].width = 70; }; const App = () => { const [loadPanelEnabled, setLoadPanelEnabled] = useState(true); const onContentReady = useCallback(() => { setLoadPanelEnabled(false); }, []); return ( <DataGrid height={440} dataSource={dataSource} keyExpr="id" showBorders={true} customizeColumns={customizeColumns} onContentReady={onContentReady} > <Sorting mode="none" /> <Scrolling mode="virtual" /> <LoadPanel enabled={loadPanelEnabled} /> </DataGrid> ); }; export default App;

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.tsx'; ReactDOM.render( <App />, document.getElementById('app'), );

let s = 123456789; function random() { s = (1103515245 * s + 12345) % 2147483647; return s % (10 - 1); } export function generateData(count: number) { let i; const surnames = ['Smith', 'Johnson', 'Brown', 'Taylor', 'Anderson', 'Harris', 'Clark', 'Allen', 'Scott', 'Carter']; const names = ['James', 'John', 'Robert', 'Christopher', 'George', 'Mary', 'Nancy', 'Sandra', 'Michelle', 'Betty']; const gender = ['Male', 'Female']; const items: ({ id: number; firstName: string; lastName: string; gender: string; birthDate: Date; })[] = []; const startBirthDate = Date.parse('1/1/1975'); const endBirthDate = Date.parse('1/1/1992'); for (i = 0; i < count; i += 1) { const birthDate = new Date(startBirthDate + Math.floor( (random() * (endBirthDate - startBirthDate)) / 10, )); birthDate.setHours(12); const nameIndex = random(); const item = { id: i + 1, firstName: names[nameIndex], lastName: surnames[random()], gender: gender[Math.floor(nameIndex / 5)], birthDate, }; items.push(item); } return items; }

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(<App />, document.getElementById('app'));

let s = 123456789; function random() { s = (1103515245 * s + 12345) % 2147483647; return s % (10 - 1); } export function generateData(count) { let i; const surnames = [ 'Smith', 'Johnson', 'Brown', 'Taylor', 'Anderson', 'Harris', 'Clark', 'Allen', 'Scott', 'Carter', ]; const names = [ 'James', 'John', 'Robert', 'Christopher', 'George', 'Mary', 'Nancy', 'Sandra', 'Michelle', 'Betty', ]; const gender = ['Male', 'Female']; const items = []; const startBirthDate = Date.parse('1/1/1975'); const endBirthDate = Date.parse('1/1/1992'); for (i = 0; i < count; i += 1) { const birthDate = new Date( startBirthDate + Math.floor((random() * (endBirthDate - startBirthDate)) / 10), ); birthDate.setHours(12); const nameIndex = random(); const item = { id: i + 1, firstName: names[nameIndex], lastName: surnames[random()], gender: gender[Math.floor(nameIndex / 5)], birthDate, }; items.push(item); } return items; }

<!DOCTYPE html> <html lang="en"> <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=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> <script src="bundles/vendor/react.vendor.js"></script> <script src="./bundle.js"></script> </body> </html>