# Line items (Notchset): prompt.md (v2.1.0)

- id: `line-items` · version 2.1.0 · block · pro (Pro)
- category: Charts
- build: one set of files for every shadcn style
- install: `npx shadcn@latest add @notchset-pro/line-items`
- npm dependencies: lucide-react@^1
- registry dependencies: utils, https://notchset.dev/r/notchset-foundation.json, @notchset/field, @notchset/reveal
- docs: https://notchset.dev/blocks/line-items
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

What is being bought, one row per product: quantity, unit price, discount and the line's total. Values save as you type and the totals follow; a value it can't take stays in the field with the words to fix it..

## Build it
- Stack: React 18.3 or 19, TypeScript, Tailwind CSS v4 utility classes on the foundation's roles, a components.json (imports use its aliases).
- Packages: `lucide-react@^1`.
- Files: `components/ui/notchset/blocks/line-items.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-foundation`, `field`, `reveal`.
- Builds: one set of files, the same for every shadcn style.
- Exports to keep: `LineItems`, and every exported type.
- CSS: the install adds the notchset foundation (its roles, keyframes and motion switch, reading your shadcn tokens for colour) to your global stylesheet once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Colours: every part reads the foundation's roles (`--ns-canvas`, `--ns-ink`, `--ns-line`, `--ns-signal` …), which read your shadcn tokens (`--background`, `--foreground`, `--border`, `--destructive` …), plus the optional `--success` and `--warning`. Retheme on `:root` or any container; never add Tailwind colour classes inside the component.
- This item reads `--ns-bad-ink`, `--ns-hover`, `--ns-ink`, `--ns-ink-3`, `--ns-line-soft`, `--ns-signal`, `--ns-text-meta`, `--ns-text-small`, `--ns-weight-medium`.
- Retune it (on any ancestor) with the foundation's roles and hooks: `--ns-bad`, `--ns-bad-ink`, `--ns-band`, `--ns-band-edge`, `--ns-band-grade`, `--ns-band-optimal`, `--ns-beat`, `--ns-bezel`, `--ns-canvas`, `--ns-cat-1`, `--ns-cat-2`, `--ns-cat-3`, `--ns-cat-4`, `--ns-cat-5`, `--ns-cat-6`, `--ns-check`, `--ns-chip`, `--ns-control`, `--ns-control-pad`, `--ns-control-sm`, `--ns-deep`, `--ns-deep-ink`, `--ns-deep-ink-2`, `--ns-deep-line`, `--ns-dialog`, `--ns-dialog-lg`, `--ns-dialog-sm`, `--ns-ease`, `--ns-ease-in`, `--ns-ease-panel`, `--ns-ease-pop`, `--ns-field`, `--ns-flood-arc`, `--ns-flood-aurora`, `--ns-flood-behind-1`, `--ns-flood-behind-2`, `--ns-flood-bloom`, `--ns-flood-deep`, `--ns-flood-dial-bloom`, `--ns-flood-glass`, `--ns-flood-grain`, `--ns-flood-image`, `--ns-flood-ink`, `--ns-flood-ink-low`, `--ns-flood-light`, `--ns-flood-mid`, `--ns-flood-pale`, `--ns-flood-pane`, `--ns-flood-pane-edge`, `--ns-flood-pill-ink`, `--ns-flood-ribbon`, `--ns-flood-ribbon-core`, `--ns-flood-shadow`, `--ns-flood-sheen`, `--ns-flood-wash`, `--ns-font-body`, `--ns-font-display`, `--ns-font-mono`, `--ns-font-script`, `--ns-glass`, `--ns-glass-blur`, `--ns-glass-shadow`, `--ns-glow`, `--ns-grain`, `--ns-gutter`, `--ns-header`, `--ns-heat`, `--ns-hover`, `--ns-ink`, `--ns-ink-2`, `--ns-ink-3`, `--ns-ink-4`, `--ns-leading`, `--ns-lift`, `--ns-light-1`, `--ns-light-2`, `--ns-light-3`, `--ns-light-spread`, `--ns-light-strength`, `--ns-line`, `--ns-line-soft`, `--ns-lit-edge`, `--ns-menu-dy`, `--ns-menu-row`, `--ns-mesh`, `--ns-mesh-frost`, `--ns-ok`, `--ns-ok-ink`, `--ns-orb-body`, `--ns-orb-cool`, `--ns-orb-core`, `--ns-orb-dawn`, `--ns-orb-deep`, `--ns-orb-edge`, `--ns-orb-grain`, `--ns-orb-ground`, `--ns-orb-halo`, `--ns-orb-inner`, `--ns-orb-key`, `--ns-orb-lift`, `--ns-orb-limb`, `--ns-orb-limb-from`, `--ns-orb-rim`, `--ns-orb-skin-hi`, `--ns-orb-skin-lo`, `--ns-orb-skin-mid`, `--ns-orb-warm`, `--ns-panel`, `--ns-panel-w`, `--ns-prism-edge`, `--ns-prism-glint`, `--ns-prism-sheen`, `--ns-prism-tint`, `--ns-pulse`, `--ns-radius`, `--ns-radius-card`, `--ns-radius-full`, `--ns-radius-lg`, `--ns-radius-sm`, `--ns-radius-xl`, `--ns-raised`, `--ns-range`, `--ns-row`, `--ns-row-compact`, `--ns-segment`, `--ns-selected`, `--ns-series`, `--ns-series-core`, `--ns-series-lilac`, `--ns-series-tint`, `--ns-shadow-dialog`, `--ns-shadow-float`, `--ns-shadow-panel`, `--ns-sheet`, `--ns-sheet-bottom`, `--ns-side`, `--ns-signal`, `--ns-sleep-awake`, `--ns-sleep-deep`, `--ns-sleep-light`, `--ns-sleep-rem`, `--ns-space-1`, `--ns-space-2`, `--ns-space-3`, `--ns-space-4`, `--ns-space-5`, `--ns-space-6`, `--ns-space-8`, `--ns-space-section`, `--ns-stack-on`, `--ns-standing-critical`, `--ns-standing-in`, `--ns-standing-out`, `--ns-state-doing`, `--ns-state-done`, `--ns-state-review`, `--ns-state-todo`, `--ns-switch-h`, `--ns-switch-w`, `--ns-text-body`, `--ns-text-control`, `--ns-text-display`, `--ns-text-figure`, `--ns-text-headline`, `--ns-text-hero`, `--ns-text-lede`, `--ns-text-meta`, `--ns-text-page`, `--ns-text-record`, `--ns-text-small`, `--ns-text-strong`, `--ns-text-sub`, `--ns-text-title`, `--ns-tile-shadow`, `--ns-time-born`, `--ns-time-color`, `--ns-time-dialog`, `--ns-time-menu`, `--ns-time-page`, `--ns-time-panel`, `--ns-time-toast`, `--ns-tint`, `--ns-tint-ink`, `--ns-toast-bottom`, `--ns-toast-left`, `--ns-touch`, `--ns-tracking-display`, `--ns-tracking-headline`, `--ns-warn`, `--ns-warn-ink`, `--ns-wash-clay`, `--ns-wash-dusk`, `--ns-wash-graphite`, `--ns-wash-ink`, `--ns-wash-sage`, `--ns-wash-sand`, `--ns-weight-light`, `--ns-weight-medium`, `--ns-weight-regular`, `--ns-weight-strong`, `--ns-well`.
- Never add Tailwind colour classes inside the component.

```tsx
import { type LineItem, LineItems } from "@/components/ui/notchset/blocks/line-items";
```

## Parts
- A single export that takes props.

## Match the original
- Read `components/ui/notchset/blocks/line-items.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when

### Not when

## Built from
- field (`field`), installed with it: reuse it, don't rebuild it
- reveal (`reveal`), installed with it: reuse it, don't rebuild it

## Mistakes
- Recreating the component instead of installing it

## Usage

```tsx
"use client";
import * as React from "react";
import { type LineItem, LineItems } from "@/components/ui/notchset/blocks/line-items";
import { Button } from "@/components/ui/notchset/button";

/* a two-year contract: yearly prices count twice in a line's total, and the term is said beside each price */
const TERM = 2;
const PRODUCTS = [
  { id: "g", name: "Growth seat", unit: 576, per: `per seat a year · ${TERM}-year term`, years: TERM },
  { id: "eu", name: "EU data residency", unit: 4400, per: `a year · ${TERM}-year term`, years: TERM },
  { id: "ob", name: "Onboarding", unit: 9500, per: "once", years: 1 },
];
const usd = (n: number) => "$" + Math.round(n).toLocaleString("en-US");

export default function LineItemsDemo() {
  const [rows, setRows] = React.useState([{ id: "g", qty: 120, disc: 10 }, { id: "eu", qty: 1, disc: 0 }]);
  const product = (id: string) => PRODUCTS.find((p) => p.id === id)!;
  const lines: LineItem[] = rows.map((r) => {
    const p = product(r.id);
    return { key: r.id, product: p.name, qty: r.qty, unit: usd(p.unit), per: p.per, disc: r.disc, total: usd(r.qty * p.unit * p.years * (1 - r.disc / 100)) };
  });
  /* a value it can't take returns the words to fix it; null saves it */
  /* a quantity is whole seats or units, 1 or more; a discount may have a decimal */
  const set = (k: "qty" | "disc", max: number) => (i: number, raw: string) => {
    const n = Number(raw);
    if (k === "qty" && !(raw.trim() && Number.isInteger(n) && n >= 1 && n <= max)) return "A whole number, like 25";
    if (!raw.trim() || !Number.isFinite(n) || n < 0 || n > max) return `0 to ${max}%`;
    setRows((rs) => rs.map((r, j) => (j === i ? { ...r, [k]: n } : r)));
    return null;
  };
  const next = PRODUCTS.find((p) => !rows.some((r) => r.id === p.id));
  return (
    <div className="flex w-full flex-col gap-3">
      <Button size="sm" className="self-start" disabled={!next} onClick={() => next && setRows((rs) => [...rs, { id: next.id, qty: 1, disc: 0 }])}>
        Add a line
      </Button>
      <LineItems editable lines={lines} names={rows.map((r) => product(r.id).name)} onQty={set("qty", 100000)} onDisc={set("disc", 100)} onRemove={(i) => setRows((rs) => rs.filter((_, j) => j !== i))} empty="No lines yet." />
    </div>
  );
}
```

This example also uses `button` (https://notchset.dev/components/button). Installing this item doesn't bring them; to paste the example as it is: `npx shadcn@latest add @notchset-pro/line-items @notchset/button`. The `@notchset-pro` items are Pro: they need the registries in components.json and the key (Setup).

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `lines` | `LineItem[]` |  | Required. |
| `editable` | `boolean` |  |  |
| `onQty` | `(i: number, raw: string) => string \| null` |  | Returns the words when a value is refused (out of range, offline); null when it saved. |
| `onDisc` | `(i: number, raw: string) => string \| null` |  |  |
| `onRemove` | `(i: number) => void` |  |  |
| `track` | `(key: string, retry: (() => string \| null) \| null) => void` |  | Told about a value that couldn't be saved (with a way to try it again), and again with null once it's settled, so a page can hold back Send while a field still shows something the record doesn't have. |
| `drafts` | `LineDrafts` |  | Keeps refused values outside the editors (the page then settles them itself, so track isn't needed for lines). |
| `names` | `string[]` |  | Names the line in control labels ("Quantity of Growth seat"). |
| `empty` | `React.ReactNode` |  |  |

Full docs: https://notchset.dev/blocks/line-items

## Customising
- Colours: every part reads the foundation's roles (`--ns-canvas`, `--ns-ink`, `--ns-line`, `--ns-signal` …), which read your shadcn tokens (`--background`, `--foreground`, `--border`, `--destructive` …), plus the optional `--success` and `--warning`. Retheme on `:root` or any container; never add Tailwind colour classes inside the component.
- Dark mode follows the `.dark` class or `data-theme="dark"` on an ancestor (the shadcn and next-themes conventions).
- Update later: Commit or stash local changes first (or copy the files), so the update can be undone. Read https://notchset.dev/r/changelog.json for the new versions: a major version, an entry marked breaking or a merge says what to change. Then re-run the install with `--overwrite`, on a branch. It replaces the component's files, the shared helper files they import, and the item's CSS rules in the global stylesheet, so review the whole diff (components, shared files, CSS), re-apply your own edits, and run the app's typecheck, tests and build.

## Accessibility contract (preserve when editing)

## Install

```bash
npx shadcn@latest add @notchset-pro/line-items
```

Pro item: needs the `@notchset-pro` registry in `components.json` and `NOTCHSET_TOKEN` in `.env.local` (https://notchset.dev/account). Setup: https://notchset.dev/docs/pro. Every components.json `style` gets the same files.

## Continue the workflow

- [Plan picker](https://notchset.dev/blocks/plan-picker)
- [Express pay](https://notchset.dev/blocks/express-pay)
- [Price summary](https://notchset.dev/blocks/price-summary)

The foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://notchset.dev/r/notchset-foundation.json.