demo D199

Statistics of a selection in ESM

Drag a rectangle; it is summarised as one set of figures

grid.selection.statistics()

This grid summarises a dragged rectangle of cells as one set of figures. It answers 'what do these add up to' for an ad-hoc block, so a reader checks a subtotal by selecting it, the way a spreadsheet status bar does.

Building…

Loading a live grid…

This is the ES module version. The grid is imported straight from a CDN as a module, the same configuration as the vanilla tab without a global script tag, so it drops into any bundler or a bare module script.

The configuration

<link rel="stylesheet" href="https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.min.css">

<div id="grid" style="height: 440px"></div>
<div id="out" style="margin-top: 12px; font-family: monospace">Select a block of numeric cells</div>

<script type="module">
  import { createGrid } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.esm.min.js';

  const grid = createGrid(document.getElementById('grid'), {
    rowKey: 'id',
    selection: { mode: 'multiple', ranges: true },
    columns: [
      { field: 'symbol', title: 'Symbol', layout: { pin: 'start', width: 120 } },
      { field: 'desk', title: 'Desk', filter: { type: 'set' } },
      { field: 'price', title: 'Price', type: 'number' },
      { field: 'bid', title: 'Bid', type: 'number' },
      { field: 'volume', title: 'Volume', type: 'number' },
      { field: 'notional', title: 'Notional', type: 'number', format: { style: 'currency', currency: 'USD' }, total: 'sum' },
    ],
    rows,  // trading book records
  });

  const out = document.getElementById('out');
  // Drag a range of numeric cells: selection.statistics() returns the count,
  // median, quartiles and standard deviation for the block, read from the
  // live grid whenever the range changes.
  grid.on('range:changed', () => {
    const s = grid.selection.statistics();
    out.textContent = s
      ? s.cells + ' cells, median ' + s.median + ', q1 ' + s.q1 + ', q3 ' + s.q3 + ', sd ' + s.stddev
      : 'Select a block of numeric cells';
  });
</script>