Set FlexGrid's selectionMode property to MultiRange to enable Excel-style multi-range selection. Users will be able to select multiple ranges by ctrl-clicking and dragging on the grid.
The sample shows how you can provide Excel-style dynamic data summaries for the current selection (regular or multi-range) and how to export selected ranges to CSV files.
Note that clipboard and export commands only work for multi-range selections if all selected ranges refer to the same column range or to the same row range. (Excel also behaves this way.)
import 'bootstrap.css';
import '@mescius/wijmo.styles/wijmo.css';
import './styles.css';
import { glbz, isNumber, saveFile } from '@mescius/wijmo';
import { FlexGrid, SelectionMode, CellRange } from '@mescius/wijmo.grid';
document.readyState === 'complete' ? init() : window.onload = init;
;
function init() {
// show the data in a grid
var theGrid = new FlexGrid('#theGrid', {
alternatingRowStep: 0,
showMarquee: true,
showSelectedHeaders: 'All',
anchorCursor: true,
selectionMode: SelectionMode.MultiRange,
itemsSource: getData(),
// update aggregate display when selection changes
selectionChanged: (s, e) => {
// calculate aggregates
let tally = { cnt: 0, cntAll: 0, sum: 0, avg: 0 }, ranges = s.selectedRanges;
for (let i = 0; i < ranges.length; i++) {
aggregateRange(tally, s, ranges, i);
}
// update the display using template literals
let msg = (tally.cnt > 1)
? glbz `Count: <b>${tally.cntAll}:n0</b>\tAverage: <b>${tally.avg}:g4\tSum: <b>${tally.sum}:g4</b>`
: (tally.cntAll > 1)
? glbz `Count: <b>${tally.cntAll}:n0</b>`
: 'Ready';
// update the display using wijmo.format
//let msg = (tally.cnt > 1)
// ? format('Count: <b>{cntAll:n0}</b>\tAverage: <b>{avg:g4}</b>\tSum: <b>{sum:g4}</b>', tally)
// : (tally.cntAll > 1)
// ? format('Count: <b>{cntAll:n0}</b>', tally)
// : 'Ready';
// show the result
document.getElementById('mr-aggregates').innerHTML = msg;
}
});
// update aggregates for a range, accounting for overlapping ranges
function aggregateRange(tally, grid, ranges, index) {
let rng = ranges[index];
for (let r = rng.topRow; r <= rng.bottomRow; r++) {
for (let c = rng.leftCol; c <= rng.rightCol; c++) {
// account for overlapping ranges
let overlapped = false;
for (let i = 0; i < index && !overlapped; i++) {
let rng = ranges[i];
if (rng.contains(r, c)) {
overlapped = true;
}
}
// tally non-overlapped cells
if (!overlapped) {
let data = grid.getCellData(r, c, false);
if (isNumber(data)) { // handle numbers
tally.cnt++;
tally.sum += data;
}
if (data !== '' && data !== null) { // handle non-empty cells
tally.cntAll++;
}
}
}
}
tally.avg = tally.cnt > 0 ? tally.sum / tally.cnt : 0;
}
// export grid or selection to CSV
document.getElementById('btn-csv-grid').addEventListener('click', () => {
var rng = new CellRange(0, 0, theGrid.rows.length - 1, theGrid.columns.length - 1), csv = theGrid.getClipString(rng, true, true);
saveFile(csv, 'FlexGrid.csv');
});
document.getElementById('btn-csv-sel').addEventListener('click', () => {
var csv = theGrid.getClipString(null, true, true);
saveFile(csv, 'FlexGridSelection.csv');
});
// create some random data
function getData() {
var data = [];
var countries = 'Austria,Belgium,Chile,Denmark,Finland,Japan,UK'.split(',');
for (var i = 0; i < 300; i++) {
data.push({
id: i,
from: countries[i % countries.length],
to: countries[(i + 1) % countries.length],
sales: Math.random() * 10000,
expenses: Math.random() * 5000,
amount: Math.random() * 10000,
extra: Math.random() * 10000,
});
}
return data;
}
}
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