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demo D72

Pivot

Transposing values across distinct keys, with a column guard

columns.pivot(['status'])

Building…
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The configuration

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/lattice-grid.min.css">
<style>
  #grid > div { height: 540px; }
</style>
<div id="grid"></div>

<script type="module">
  import * as Vue from 'https://esm.sh/vue@3';
  import { createGrid } from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/lattice-grid.esm.min.js';
  import createLatticeGrid from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/modules/vue.esm.min.js';

  const LatticeGrid = createLatticeGrid({ vue: Vue, createGrid });

  Vue.createApp({
    components: { LatticeGrid },
    data() {
      return {
        config: {
          rowKey: 'id',
          // A pivot needs rows to group, a column to transpose, and a column with
          // a reduction to fill the cells. The environments in the data each
          // become a generated column holding that account's cost in it.
          // maxColumns is the guard: past the limit the grid shows the rows
          // unpivoted rather than building a grid nobody can read.
          pivot: { enabled: true, maxColumns: 24 },
          // With one value column each generated heading is titled with the pivot
          // value alone, so the headings read 'prod' and not 'Sum of Monthly cost'.
          showTotalInHeader: true,
          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' }, pivot: { enabled: true, index: 0 },
              cell: { decoration: 'pill', variant: { map: {
                prod: 'danger', 'prod-2': 'danger', 'definitely-prod': 'danger',
                staging: 'warning', untagged: 'warning', test: 'info',
                dev: 'success', 'not-prod': 'neutral',
              } } } },
            { field: 'cost', title: 'Monthly cost', type: 'number', layout: { width: 170 },
              format: { style: 'currency', currency: 'USD', decimals: 2 }, total: 'sum' },
          ],
          rows,  // 20,000 cloud cost records: accounts down, environments across
        },
      };
    },
    template: '<lattice-grid v-bind="config" />',
  }).mount('#grid');
</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.

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