Bar chart

Copy this

<div class="bar-chart-region hm-measure-lg" data-bar-chart>
  <div class="bar-chart-bars">
    <div class="bar-chart-row">
      <span class="bar-chart-label">API</span>
      <div class="bar-chart-track">
        <div class="bar-chart-fill" style="width: 84%"></div>
      </div>
      <span class="bar-chart-value">126</span>
    </div>
    <div class="bar-chart-row">
      <span class="bar-chart-label">Dashboard</span>
      <div class="bar-chart-track">
        <div class="bar-chart-fill" style="width: 56%"></div>
      </div>
      <span class="bar-chart-value">84</span>
    </div>
    <div class="bar-chart-row">
      <span class="bar-chart-label">Billing</span>
      <div class="bar-chart-track">
        <div class="bar-chart-fill" style="width: 23%"></div>
      </div>
      <span class="bar-chart-value">35</span>
    </div>
  </div>
</div>

Server exchange

This Hyperpart has no server exchange — it is presentation or client chrome only. htmx does not issue a request on this part's behalf. If you put an affordance (hx-*) on a control that uses this markup, that action's exchange belongs to the action, not this part. See Swap contract for host-owned envelopes.

Swap contract

Agent-visible HTMX topology (ADR-0054 / decision 0012). exchange envelope = what the response may re-emit relative to the persistent slot (body_only | outer | none | host_owned | document). dual-lock validates part markup only — not this envelope. Stem: stems/morph-safe-hypermedia.md; decision: docs/decisions/0012-swap-identity-contract.md.

No host HTMX exchange on this part — presentation or client chrome only. exchange envelope: n/a.

If a host wraps this markup in hx-*, that host owns the swap contract (sole identity + envelope). Prefer innerMorph / outerMorph for stable slots; replacement for flash; body-only responses under inner swaps.

Envelope response examples

This part has no owned exchange (envelope n/a). If a host adds hx-*, that host’s envelope applies — typically body_only:

<!-- Host wraps this presentation part with hx-* (host owns envelope) -->
<!-- Prefer: hx-swap="innerMorph" hx-target="#panel-body" -->
<!-- Server returns body_only interior for #panel-body -->
<div class="dz-stack">content…</div>

Do not re-own the slot:

<!-- WRONG: server returns the presentation root with a new id every poll -->
<div id="bar-chart-root" data-dz-region>…</div>

How to use it

No extended guidance authored yet — start from Copy this and the dependency chips (Primitive = markup only; controller = load listed JS; Endpoint = implement Server exchange).

Seams

• copy the partial under Copy this; keep root class and data-* modifiers so the CSS/JS bundle matches
• no Server exchange on this part — pure presentation or client chrome
• satisfy the DOM contract tables (CI stop-ship)

DOM contract

What the emitted HTML must satisfy — the table is the required surface; Python under contracts/ is the package-internal dual-lock CI runs (tests/test_contracts.py), not an app route. Standalone HTMX4: implement the API so responses match this markup. Dazzle: the agent emits SSR that already satisfies it. Do not invent attrs outside these tables. For request/response wiring see Server exchange.

contracts/bar_chart.py

Required in the DOM: root [data-bar-chart] (part bar-chart). Emit only these attributes — inventing extras is fine only if controllers ignore them; omitting required ones fails CI (tests/test_contracts.py).

Ingestion model BarChartRow

Server-side shape before render — one normalisation boundary for producers.

Exemplar render()

Executable in CI: the Python below is render(); the boxed preview is render(EXEMPLARS[0]) — the first fixture the dual-lock tests emit, not a separate widget and not gallery mock data.

def render(chart: BarChart) -> str:
    """Model → bar chart region."""
    if not chart.rows:
        return '<div class="dz-bar-chart-region" data-dz-bar-chart></div>'

    rows_html = "".join(
        f'<div class="dz-bar-chart-row">'
        f'<span class="dz-bar-chart-label">'
        f"{(row.label_html if row.label_html.strip() else html.escape(row.label))}"
        f"</span>"
        f'<div class="dz-bar-chart-track">'
        f'<div class="dz-bar-chart-fill" '
        f'style="width: {max(0, min(100, row.width_pct))}%"></div>'
        f"</div>"
        f'<span class="dz-bar-chart-value">{row.count}</span>'
        f"</div>"
        for row in chart.rows
    )
    return (
        f'<div class="dz-bar-chart-region" data-dz-bar-chart>'
        f'<div class="dz-bar-chart-bars">{rows_html}</div>'
        f"</div>"
    )

Notes

Source files

Canonical registration in the registry. No dedicated controller — CSS for this part lives in the layered bundle.

site/registry.py · contracts/bar_chart.py