demo D184

Shadow columns: what changed in Web Component

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 web component version. A lattice-grid custom element renders the grid with no build step, its configuration set as a property, so it works on a page that has no bundler at all.

The configuration

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

<script type="module">
  import { defineLatticeGrid } from 'https://cdn.latticegrid.dev/lattice-grid@1.108.0/modules/webcomponent.esm.min.js';
  defineLatticeGrid();
</script>

<lattice-grid row-key="id" style="display: block; height: 460px"></lattice-grid>

<script type="module">
  const grid = document.querySelector('lattice-grid');
  grid.config = {
    highlightOnChange: { duration: 500 },
    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 } },
    ],
  };
  grid.rows = rows;  // trading book records
</script>