Auto-Size Rows Asynchronously (React)

Auto-sizing all rows on a FlexGrid control with a lot of data is a time-consuming process. This sample demonstrates how you can auto-size rows asynchronously to improve performance. The code listens to events and auto-sizes only rows that are currently in view and have not been auto-sized yet.

Learn about FlexGrid | FlexGrid API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useRef } from 'react'; import useEvent from 'react-use-event-hook'; import { FlexGrid, FlexGridColumn } from '@mescius/wijmo.react.grid'; import './app.css'; import { data } from './data'; function App() { const theGridRef = useRef(null); const initialized = useEvent((grid) => { theGridRef.current = grid; setTimeout(() => { autoSizeRowsAsync(grid); }, 50); }); const onLoadedRows = useEvent((grid) => { autoSizeRowsAsync(grid); }); const onCellEditEnded = useEvent((grid, e) => { if (grid.columns[e.col].wordWrap) { autoSizeRowsAsync(grid, e.row); } }); const onScrollPositionChanged = useEvent((grid) => { var vr = grid.viewRange; for (var r = vr.topRow; r <= vr.bottomRow; r++) { if (grid.rows[r].height == null) { grid.autoSizeRows(r, r); } } }); const onResizedColumn = useEvent((grid, e) => { if (grid.columns[e.col].wordWrap) { autoSizeRowsAsync(grid); } }); const autoSizeRowsAsync = useEvent((grid, rowIndex) => { if (rowIndex != null) { grid.rows[rowIndex].height = null; } else { grid.rows.forEach((row) => row.height = null); } grid.onScrollPositionChanged(); }); const onAsSyncClick = () => { var start = Date.now(); theGridRef.current.autoSizeRows(); alert("AutoSized all rows in " + (Date.now() - start) + "ms"); }; return (<div className="container-fluid"> <button onClick={onAsSyncClick} className="btn btn-default">AutoSizeRows (synchronously)</button> <FlexGrid itemsSource={data} loadedRows={onLoadedRows} cellEditEnded={onCellEditEnded} scrollPositionChanged={onScrollPositionChanged} resizedColumn={onResizedColumn} initialized={initialized}> <FlexGridColumn binding="id" header="ID" minWidth={60} isReadOnly={true}/> <FlexGridColumn binding="countries" header="Countries" width={150} wordWrap={true}/> <FlexGridColumn binding="sales" header="Sales"/> <FlexGridColumn binding="expenses" header="Expenses"/> </FlexGrid> </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 FlexGrid Auto-Size Rows asynchronously</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>
.container-fluid .wj-flexgrid { max-height: 300px; margin: 6px 0; }
function getData() { var data = []; for (var i = 0; i < 10000; i++) { data.push({ id: i, countries: getCountries(), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; } function getCountries() { var countries = 'Austria,Belgium,Canada,Denmark,Estonia,Finland,Germany,Hungary,Ireland,Japan,Korea,Lebanon,Mexico,Norway,Portugal,Qatar,Romania,Spain,Turkey,Ukraine,Venezuela,Zaire'.split(','); var c = []; var cnt = Math.round(Math.random() * 8) + 1; var start = Math.round(Math.random() * countries.length); for (var i = 0; i < cnt; i++) { c.push(countries[(i + start) % countries.length]); } return c.join(', '); } export const data = getData();
(function (global) { System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true, react: true }, meta: { '*.css': { loader: 'css' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { 'jszip': 'npm:jszip/dist/jszip.js', '@mescius/wijmo': 'npm:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js', '@mescius/wijmo.styles': 'npm:@mescius/wijmo.styles', '@mescius/wijmo.cultures': 'npm:@mescius/wijmo.cultures', '@mescius/wijmo.chart': 'npm:@mescius/wijmo.chart/index.js', '@mescius/wijmo.chart.analytics': 'npm:@mescius/wijmo.chart.analytics/index.js', '@mescius/wijmo.chart.animation': 'npm:@mescius/wijmo.chart.animation/index.js', '@mescius/wijmo.chart.annotation': 'npm:@mescius/wijmo.chart.annotation/index.js', '@mescius/wijmo.chart.finance': 'npm:@mescius/wijmo.chart.finance/index.js', '@mescius/wijmo.chart.finance.analytics': 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"npm:react-use-event-hook/dist/esm/useEvent.js", }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'jsx' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);