Auto-Size Rows Asynchronously

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.

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import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import * as wjGrid from '@grapecity/wijmo.grid'; import { getCountries } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // // create some random data var data = []; for (var i = 0; i < 10000; i++) { data.push({ id: i, countries: getCountries(), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } // // show the data in a grid with fixed height var theGrid = new wjGrid.FlexGrid('#theGrid', { autoGenerateColumns: false, columns: [ { binding: 'id', header: 'ID', minWidth: 60, isReadOnly: true }, { binding: 'countries', header: 'Countries', width: 150, wordWrap: true }, { binding: 'sales', header: 'Sales' }, { binding: 'expenses', header: 'Expenses' } ], // // auto-size all rows when they are loaded loadedRows: (s, e) => { autoSizeRowsAsync(s); }, // // auto-size all rows when a wrapping column is resized resizedColumn: (s, e) => { if (s.columns[e.col].wordWrap) { autoSizeRowsAsync(s); } }, // // auto-size a single row when a wrapping cell is edited cellEditEnded: (s, e) => { if (s.columns[e.col].wordWrap) { autoSizeRowsAsync(s, e.row); } }, // // autosize rows within view that haven't been autosized yet scrollPositionChanged: (s, e) => { var vr = s.viewRange; for (var r = vr.topRow; r <= vr.bottomRow; r++) { if (s.rows[r].height == null) { s.autoSizeRows(r, r); //console.log('autosized row ' + r) } } }, // // load some data itemsSource: data }); // // reset row heights to null and raise scrollPositionChanged event // to auto-size the rows that are in view and haven't been auto-sized function autoSizeRowsAsync(grid, rowIndex) { if (rowIndex != null) { grid.rows[rowIndex].height = null; } else { grid.rows.forEach(row => { row.height = null; }); } setTimeout(() => { grid.onScrollPositionChanged(); }); } // // synchronouse auto-size (to show how long it would take) document.getElementById('asSync').addEventListener('click', () => { var start = Date.now(); theGrid.autoSizeRows(); alert('AutoSized all rows in ' + (Date.now() - start) + 'ms'); }); // }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo FlexGrid Auto-Size Rows asynchronously</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div class="container-fluid"> <button id="asSync" class="btn btn-default">AutoSizeRows (synchronously)</button> <div id="theGrid"></div> </div> </body> </html>
export 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(', '); }
body { margin-bottom: 36pt; } .wj-flexgrid { max-height: 300px; margin: 6px 0; }
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