Running totals

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.13.0/lattice-grid.min.css">
<script src="https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.13.0/lattice-grid.min.js"></script>

<div id="grid" style="height: 460px"></div>

<script>
  const grid = LatticeGrid.createGrid(document.getElementById('grid'), {
    rowKey: 'id',
    columns: [
      { field: 'date', title: 'Date', type: 'date', layout: { pin: 'start', width: 150 } },
      { field: 'amount', title: 'Amount', type: 'number', total: 'sum' },
      // A running total depends on the display order, so it is running, not shadow.
      { id: 'cum',   title: 'Running',      running: { of: 'amount', kind: 'total' }, type: 'number' },
      { id: 'share', title: 'Cumulative %', running: { of: 'amount', kind: 'percent' }, type: 'number', format: { style: 'percent' } },
    ],
    state: { sort: [{ col: 'date', dir: 'asc' }] },
    rows,
  });
</script>