Selection Events

The FlexGrid's selection property returns a CellRange object that contains the range of selected cells. When the selection changes, the grid raises the selectionChanging and selectionChanged events. The grid below uses the selectionChanged event to show a summary of the data selected.

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import * as wjGrid from '@grapecity/wijmo.grid'; import * as wjCore from '@grapecity/wijmo'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // // create some random data var countries = 'US,Germany,UK,Japan'.split(','); var data = []; for (var i = 0; i < 20; i++) { data.push({ id: i, country: countries[i % countries.length], sales: Math.random() * 10000, expenses: Math.random() * 5000, overdue: i % 4 == 0 }); } // // bind a grid to the data var elLog = document.getElementById('log'); var placeholder = elLog.innerHTML; var theGrid = new wjGrid.FlexGrid('#theGrid', { itemsSource: new wjCore.CollectionView(data, { groupDescriptions: ['country'] // group data by country }), selectionChanged: function (s, e) { var html = placeholder; if (!theGrid.selection.isSingleCell) { var stats = getSelectionStats(theGrid); var fmt = stats.sum != null ? 'Avg: <b>{avg:n2}</b>, Count: <b>{cnt:n0}</b>, Sum: <b>{sum:n2}</b>' : 'Count: {cnt:n2}'; html = wjCore.format(fmt, stats); } elLog.innerHTML = html; } }); // // get statistics for the current selection function getSelectionStats(grid) { var sel = grid.selection, cnt = 0, ncnt = 0, sum = 0; for (var r = sel.topRow; r <= sel.bottomRow; r++) { for (var c = sel.leftCol; c <= sel.rightCol; c++) { var val = grid.cells.getCellData(r, c, false); if (val != null) { cnt++; if (wjCore.isNumber(val)) { ncnt++; sum += val; } } } } return { cnt: cnt, sum: ncnt > 0 ? sum : null, avg: ncnt > 0 ? sum / ncnt : null }; } // }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexGrid Selection Events</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"> <div id="log"> please select a range on the grid </div> <div id="theGrid"> </div> </div> </body> </html>
.wj-flexgrid { max-height: 220px; margin:10px; } #log { font-style: italic; text-align: center; margin-bottom: 10px; opacity: .5; } body { margin-bottom: 24px; }
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