demo D185

Shadow columns: rank and movement in Svelte

Rank, percentile and places moved; sort by places moved for live top movers

shadow: { of, kind: 'rankChange' }

This grid adds shadow columns for rank, percentile and places moved, so sorting by places moved surfaces the live top movers. It turns a changing feed into a leaderboard of who rose and fell most, from the movements it already tracks.

Building…

Loading a live grid…

This is the Svelte version. A use action attaches the grid to a plain element, so no framework runtime is passed in and the component stays small, while the configuration is ordinary Svelte state.

The configuration

<script>
  import { createGrid } from 'https://cdn.latticegrid.dev/lattice-grid@1.108.0/lattice-grid.esm.min.js';
  import createLatticeAction from 'https://cdn.latticegrid.dev/lattice-grid@1.108.0/modules/svelte.esm.min.js';

  const lattice = createLatticeAction({ createGrid });

  const config = {
    rowKey: 'id',
    highlightOnChange: { duration: 500 },
    // "Mark all" resets every baseline to now, so the deltas and the rank
    // change start again from the current book.
    toolPanel: {
      side: 'left', panels: ['columns', 'filters'],
      actions: [{ name: 'rebase', title: 'Mark all', icon: 'flag',
        run: ({ grid }) => grid.statistics.rebase('price') }],
    },
    columns: [
      { field: 'symbol', title: 'Symbol', layout: { pin: 'start', width: 120 } },
      { field: 'price', title: 'Price', type: 'number' },
      { id: 'rank',  title: 'Rank',   shadow: { of: 'price', kind: 'rank' }, type: 'number' },
      // rankChange is places climbed since the baseline: the top-movers column.
      { id: 'moved', title: 'Places moved', shadow: { of: 'price', kind: 'rankChange' }, type: 'number', format: { signed: true } },
      { id: 'pct',   title: 'Percentile',   shadow: { of: 'price', kind: 'percentile' }, type: 'number' },
      { id: 'quartile', title: 'Quartile', shadow: { of: 'price', kind: 'quartile' }, type: 'number' },
    ],
    // Land sorted on the movers.
    state: { sort: [{ col: 'moved', dir: 'desc' }] },
    rows,
  };
</script>

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

<div use:lattice={config} style="height: 460px"></div>