demo D204

Statistical process control in htmx

Control limits against spec limits, which are not the same thing

type: 'control', y, baseline

This draws a statistical process control chart with control limits set against spec limits, which are not the same thing. It shows when a process is drifting out of its own normal behaviour, distinct from whether it meets the spec, so you catch a change early.

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="control-chart-table" data-lattice-grid>
  <thead>
    <tr>
      <th data-field="part">Part</th>
      <th data-field="bore">Bore</th>
    </tr>
  </thead>
  <tbody>
    <tr data-id="1"><td>P001</td><td>10</td></tr>
    <tr data-id="2"><td>P002</td><td>10.079</td></tr>
    <tr data-id="3"><td>P003</td><td>9.98</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('control-chart-table'), {
    columns: [
      { field: 'part', title: 'Part', layout: { width: 110 } },
      // The spec declares the tolerance; the control chart reads it.
      { field: 'bore', title: 'Bore', type: 'number',
        spec: { lower: 9.5, upper: 10.8, target: 10 } },
    ],
  });

  // baseline sets the control limits over the first readings, then every point
  // is judged against them.
  createChart({ grid, container: '#chart', type: 'control', y: 'bore', baseline: 20 });
</script>