demo D206

A fitted line in htmx

Least squares per series, with R², agreeing with the API

fit: true

This draws a least-squares line through each series in a scatter, with R squared shown and matching the API. It puts a trend and its goodness of fit on the picture, so the strength of a relationship reads directly off the chart.

Building…

Loading a live grid…

This is the htmx version. A server-rendered table is upgraded in place, so the page is readable before any script runs and gains the full grid when the module loads, which suits a progressively enhanced app.

The configuration

<link rel="stylesheet" href="https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.min.css">

<div id="chart" style="height: 340px"></div>
<!-- A real, server-rendered table: readable with JavaScript off. data-field on
     each header names the column that cell becomes, and data-id on each row is
     the key the grid carries it under. -->
<table id="scatter-with-fit-table" data-lattice-grid>
  <thead>
    <tr>
      <th data-field="symbol">Symbol</th>
      <th data-field="desk">Desk</th>
      <th data-field="price">Price</th>
      <th data-field="bid">Bid</th>
      <th data-field="volume">Volume</th>
      <th data-field="notional">Notional</th>
    </tr>
  </thead>
  <tbody>
    <tr data-id="INS-0000000"><td>ELMW.G0</td><td>Rates</td><td>462.0258</td><td>461.2688</td><td>239420</td><td>110618217</td></tr>
    <tr data-id="INS-0000001"><td>RVNS.A1</td><td>Credit</td><td>241.8711</td><td>241.7978</td><td>119353</td><td>28868041</td></tr>
    <tr data-id="INS-0000002"><td>NRTH.E2</td><td>Commodities</td><td>98.9614</td><td>98.8353</td><td>160242</td><td>15857773</td></tr>
    <!-- the rest of the rows, rendered by your server -->
  </tbody>
</table>

<script type="module">
  import { hydrateTable } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/htmx.esm.min.js';
  import { createChart } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/charts.esm.min.js';

  // The markup carries the rows; a server-rendered table's column types are
  // declared in the config hydrateTable takes. The grid replaces the table
  // where it stood.
  const grid = hydrateTable(document.getElementById('scatter-with-fit-table'), {
    columns: [
      { field: 'symbol', title: 'Symbol', layout: { width: 120 } },
      { field: 'desk', title: 'Desk', filter: { type: 'set' } },
      { field: 'price', title: 'Price', type: 'number' },
      { field: 'bid', title: 'Bid', type: 'number' },
      { field: 'volume', title: 'Volume', type: 'number' },
      { field: 'notional', title: 'Notional', type: 'number',
        format: { style: 'currency', currency: 'USD' }, total: 'sum' },
    ],
  });

  // fit draws a least-squares line per series, with R2 beside it. The chart
  // reads the same grid, so the points and the line follow the filters.
  createChart({ grid, container: '#chart', type: 'scatter', x: 'volume', y: 'notional', fit: true });
</script>