Lily Design System™

Net Promoter Score Picker Button

A Net Promoter Score picker button is an individual button within a NetPromoterScorePicker that represents one score value on a 0-10 scale. When clicked, it selects that NPS score. The component uses aria-pressed to indicate the currently selected state, making it accessible to screen readers and keyboard users. NPS scores are categorized as Detractors (0-6), Passives (7-8), and Promoters (9-10).

Example

Show demo markup 
<div role="radiogroup" aria-label="Score"><button class="net-promoter-score-picker-button" role="radio" aria-checked="false">7</button></div>
Usage example 
<script lang="ts">
  import NetPromoterScorePickerButton from './NetPromoterScorePickerButton.svelte';

  let nps = $state<number | undefined>(undefined);
</script>

<NetPromoterScorePickerButton
  value={9}
  label="9"
  selected={nps === 9}
  onclick={() => (nps = 9)}
/>
Show Svelte source 
// In your Svelte component:
import NetPromoterScorePickerButton from "lily-design-system-svelte-headless/components/NetPromoterScorePickerButton/NetPromoterScorePickerButton.svelte";

<NetPromoterScorePickerButton>NetPromoterScorePickerButton</NetPromoterScorePickerButton>

Usage

<NetPromoterScorePicker label="How likely are you to recommend us?">
    <NetPromoterScorePickerButton value="0" label="0 - Not at all likely" onclick={handleClick} />
    <NetPromoterScorePickerButton value="1" label="1" onclick={handleClick} />
    <NetPromoterScorePickerButton value="2" label="2" onclick={handleClick} />
    <NetPromoterScorePickerButton value="3" label="3" onclick={handleClick} />
    <NetPromoterScorePickerButton value="4" label="4" onclick={handleClick} />
    <NetPromoterScorePickerButton value="5" label="5" onclick={handleClick} />
    <NetPromoterScorePickerButton value="6" label="6" onclick={handleClick} />
    <NetPromoterScorePickerButton value="7" label="7" onclick={handleClick} />
    <NetPromoterScorePickerButton value="8" label="8" selected onclick={handleClick} />
    <NetPromoterScorePickerButton value="9" label="9" onclick={handleClick} />
    <NetPromoterScorePickerButton value="10" label="10 - Extremely likely" onclick={handleClick} />
</NetPromoterScorePicker>

Props

  • value: string (required) -- the NPS score value this button represents (e.g., "0" through "10")
  • selected: boolean (default: false) -- whether this button is currently selected
  • label: string (required) -- accessible label for the button (e.g., "0 - Not at all likely", "10 - Extremely likely")
  • onclick: callback -- handler called when the button is clicked
  • ...restProps: any -- additional HTML attributes spread onto the <button> element

Keyboard Interactions

  • Tab: Focus the button
  • Enter / Space: Activate the button to select this score

ARIA

  • aria-pressed -- indicates whether this button is the currently selected score (true when selected, false otherwise)
  • aria-label -- provides the accessible name for the button (e.g., "8")

When to Use

  • Use inside NetPromoterScorePicker to represent one value on the 0-10 NPS scale.
  • Use when each score option needs aria-pressed toggle semantics and an accessible label.
  • Use to provide custom styling for Detractor (0-6), Passive (7-8), and Promoter (9-10) ranges.

When Not to Use

  • Do not use outside of a NetPromoterScorePicker -- it requires the parent picker for group semantics.
  • Do not use as a standalone toggle button -- use ToggleButton instead.

Headless

This headless component renders a <button> with aria-pressed for toggle state and aria-label for accessible naming. The consumer provides all visual styling, including button size, color coding for Detractor/Passive/Promoter ranges, selected-state appearance, and hover effects.

Styles

The consumer provides all CSS styling. The component renders with a .net-promoter-score-picker-button class for targeting. No default styles are included — this is a fully headless component.

Testing

  • Verify the component renders a <button> element with class net-promoter-score-picker-button
  • Verify aria-label` -- provides the accessible name for the button (e.g., "8")
  • Verify keyboard interactions work correctly
  • Verify pass-through attributes are applied

Advice

  • Designers: Size buttons consistently so all 11 values (0-10) fit in a row, and use distinct visual treatment for the selected state.
  • Developers: Set descriptive label values for endpoint buttons (e.g., "0 - Not at all likely", "10 - Extremely likely") to give screen reader users context about the scale.

Implementation Notes

  • Renders as a <button> element with aria-pressed for toggle state
  • Designed to be used inside a NetPromoterScorePicker component
  • Each button represents one score value from 0 to 10
  • The selected prop controls aria-pressed to indicate the active selection
  • The label prop provides the accessible name via aria-label
  • Spreads ...restProps onto the <button> element for consumer customization

Composition

NetPromoterScorePickerButton is a child component of NetPromoterScorePicker. The picker provides the container with radiogroup semantics, while each button represents one score value with toggle state.

NetPromoterScorePicker → NetPromoterScorePickerButton (value="0" through "10")

Related components

  • net-promoter-score-picker — a picker for selecting a 0-10 Net Promoter Score

References

  • WAI-ARIA Button Pattern: https://www.w3.org/WAI/ARIA/apg/patterns/button/

Canonical contract

Generated from this component's canonical metadata — the machine-checked source the implementations are held to.

Metadata

  • Component: net-promoter-score-picker-button
  • PascalCase: NetPromoterScorePickerButton
  • Description: a picker button for selecting a 0-10 Net Promoter Score
  • Status: beta — implemented and unit-tested in all seven frameworks with an axe-clean demo page; not yet exercised in composed flows
  • HTML tag: <button>
  • CSS class: .net-promoter-score-picker-button
  • Interactive: yes

ARIA

  • aria-pressed -- indicates whether this button is the currently selected score (true when selected, false otherwise)
  • aria-label -- provides the accessible name for the button (e.g., "8")

Keyboard

  • Tab: Focus the button
  • Enter / Space: Activate the button to select this score

Props

  • value: string (required) -- the NPS score value this button represents (e.g., "0" through "10")
  • selected: boolean (default: false) -- whether this button is currently selected
  • label: string (required) -- accessible label for the button (e.g., "0 - Not at all likely", "10 - Extremely likely")
  • onclick: callback -- handler called when the button is clicked
  • ...restProps: any -- additional HTML attributes spread onto the <button> element