Lattice Grid Buy a licence

demo D72

Pivot

Transposing values across distinct keys, with a column guard

columns.pivot(['status'])

Building…
Loading a live grid…

The configuration

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/lattice-grid.min.css">

<script type="module">
  import { defineLatticeGrid } from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/modules/webcomponent.esm.js';
  defineLatticeGrid();
</script>

<lattice-grid row-key="id" style="display: block; height: 540px"></lattice-grid>

<script type="module">
  const grid = document.querySelector('lattice-grid');
  grid.config = {
    // A pivot needs three things: rows to group, a column to transpose, and at
    // least one column with a reduction to fill the cells. The eight environments
    // in the data become eight generated columns, each holding the sum of that
    // account's cost in that environment. maxColumns is the guard: pivoting on a
    // column with thousands of distinct values would generate thousands of
    // columns, so past the limit the grid shows the rows unpivoted rather than
    // building a grid nobody can read.
    pivot: { enabled: true, maxColumns: 24 },
    toolPanel: {
      side: 'left',
      panels: ['columns', 'filters', 'views', 'quick'],
      actions: ['undo', 'redo', 'export', 'restore', 'maximise'],
      exportName: 'lattice-demo',
    },
    columns: [
      { field: 'account', title: 'Account', filter: { type: 'set' }, group: { enabled: true, index: 0 } },
      { field: 'environment', title: 'Env', filter: { type: 'set' },
        cell: { decoration: 'pill', variant: { map: {
          prod: 'danger', 'prod-2': 'danger', 'definitely-prod': 'danger',
          staging: 'warning', untagged: 'warning', test: 'info',
          dev: 'success', 'not-prod': 'neutral',
        } } },
        pivot: { enabled: true, index: 0 } },
      { field: 'cost', title: 'Monthly cost', type: 'number', layout: { width: 170 },
        format: { style: 'currency', currency: 'USD', decimals: 2 }, total: 'sum' },
    ],
    // With one value column each generated heading is titled with the pivot value
    // alone, which is why these headings read prod and not Sum of Monthly cost.
    showTotalInHeader: true,
  };
  grid.rows = rows;  // cloud cost rows, one object per resource
</script>

Turning row values into columns with a pivot table

A pivot transposes data: instead of one row per record, distinct values in a chosen field become the columns themselves, and each cell holds the aggregated figure for that combination, such as revenue by product down the rows and by quarter across the top. A developer reaches for this once a flat table stops answering the question directly, typically when a stakeholder wants a cross-tabulation rather than a list, or when a report needs the same underlying rows read two ways without a second dataset. This demo builds that structure through columns.pivot(['status']), an array of field names whose distinct values become the pivoted column set, with a guard that caps the number of generated columns so a field with high cardinality cannot silently produce hundreds of them. Because Lattice Grid is a JavaScript data grid built on virtual scrolling and incremental aggregation rather than server round trips, the pivot recalculates from the same per-column total definitions used elsewhere in the grid, so a sum defined once for grouping or the grand total row is reused here without a separate formula. Pivoted headers carry the same column semantics as any other, including sort and resize, so the transposed view behaves like a normal grid rather than a static export.

How do I create a pivot table in a JavaScript data grid?

Call columns.pivot() with an array of field names whose values should become columns, for example columns.pivot(['status']) to spread each distinct status into its own column. Lattice Grid aggregates the existing per-column totals into each generated cell and applies a column guard that limits how many columns a high-cardinality field can produce.

Related demos