demo D184

Shadow columns: what changed in React

Delta, percent change and a move count against the value at page load

shadow: { of, kind: 'delta' }

This grid adds shadow columns showing each value's delta, percent change and move count against its value at page load. It lets a reader see what has moved since they arrived, as real sortable columns beside the live figures.

Building…

Loading a live grid…

This is the React version. The grid mounts through the createLatticeGrid adapter, which takes its configuration as ordinary props and hands back the live grid through a ref. The grid below is the same one every other tab runs.

The configuration

<link rel="stylesheet" href="https://cdn.latticegrid.dev/lattice-grid@1.108.0/lattice-grid.min.css">

<div id="grid"></div>

<script type="module">
  import React from 'https://esm.sh/react@18';
  import { createRoot } from 'https://esm.sh/react-dom@18/client';
  import { createGrid } from 'https://cdn.latticegrid.dev/lattice-grid@1.108.0/lattice-grid.esm.min.js';
  import createLatticeGrid from 'https://cdn.latticegrid.dev/lattice-grid@1.108.0/modules/react.esm.min.js';

  const LatticeGrid = createLatticeGrid({ React, createGrid });

  const columns = [
    { field: 'symbol', title: 'Symbol', layout: { pin: 'start', width: 120 } },
    { field: 'price', title: 'Price', type: 'number' },
    // A shadow column is declared against another and maintained by the grid.
    { id: 'delta',  title: 'Change',   shadow: { of: 'price', kind: 'delta' }, type: 'number', format: { signed: true } },
    { id: 'pct',    title: 'Change %', shadow: { of: 'price', kind: 'deltaPercent' }, type: 'number', format: { style: 'percent', signed: true } },
    { id: 'moves',  title: 'Moves',    shadow: { of: 'price', kind: 'updates' }, type: 'number' },
    { id: 'streak', title: 'Streak',   shadow: { of: 'price', kind: 'streak' }, type: 'number', format: { signed: true } },
  ];

  const rows = [/* a live price book */];

  function App() {
    return (
      <LatticeGrid
        rowKey="id"
        highlightOnChange={{ duration: 500 }}
        columns={columns}
        rows={rows}
        style={{ height: '460px' }}
      />
    );
  }

  createRoot(document.getElementById('grid')).render(<App />);
</script>