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@k4k3ru/design-system-button

v1.1.0

Published

Utility for button component

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Readme

@k4k3ru/design-system-button

A lightweight, accessible Button component for HTML applications. It provides BEM-based CSS, semantic color variants, responsive theme fallbacks, and an optional TypeScript-powered ripple interaction.

Installation

npm install @k4k3ru/design-system-button

The shared design tokens are optional. When they are not installed, the Button component uses its own light and dark fallback values.

npm install @k4k3ru/tokens

Usage

Import the shared tokens first when using them, followed by the Button stylesheet.

@import "@k4k3ru/tokens/dist/style.css";
@import "@k4k3ru/design-system-button/style.css";

Create a button using the .button block and its elements.

<button class="button button--success button--round" type="button">
  <svg class="button__icon" viewBox="0 0 24 24" aria-hidden="true">
    <!-- icon path -->
  </svg>
  <span class="button__label">Save changes</span>
</button>

Initialize the optional ripple interaction once per document.

import { Button } from "@k4k3ru/design-system-button";

const button = new Button();
button.run();

// Remove the delegated event listener when it is no longer needed.
button.destroy();

The CSS can be used without initializing JavaScript. Only the pointer ripple interaction requires JavaScript.

Modifiers

Appearance

  • .button--outlined
  • .button--text
  • .button--round

Size

  • .button--small
  • Default medium size
  • .button--large

Semantic color

  • .button--error
  • .button--info
  • .button--success
  • .button--warning

Modifiers can be combined.

<button class="button button--large button--error button--outlined button--round" type="button">
  <span class="button__label">Delete account</span>
</button>

Button group

Use the standalone .button-group block to arrange multiple buttons.

<div class="button-group">
  <button class="button button--text" type="button">
    <span class="button__label">Cancel</span>
  </button>
  <button class="button button--success" type="button">
    <span class="button__label">Save</span>
  </button>
</div>

Disabled state

Use the native disabled attribute for <button> elements.

<button class="button" disabled type="button">
  <span class="button__label">Unavailable</span>
</button>

aria-disabled="true" is also styled and excluded from ripple interactions. ARIA does not prevent activation by itself, so applications must suppress activation when it is used on links or other non-button elements.

Themes

Without shared tokens, the component follows the operating-system color scheme. An explicit theme can be selected on the root HTML element.

<html data-theme="light">
<html data-theme="dark">

When @k4k3ru/tokens is loaded, its color variables take precedence over the built-in fallback palette.

Customization

Override the public Button custom properties after importing the stylesheet.

:root {
  --button-background: #f1f3f5;
  --button-color-success: #087f5b;
  --button-height-medium: 2.75rem;
  --button-radius-round: 999px;
}

Variables prefixed with --_button- are internal implementation details and are not part of the public customization API.

Accessibility

  • Prefer the native <button> element.
  • Set type="button" unless the button submits a form.
  • Provide visible label text or an accessible name for icon-only buttons.
  • Decorative SVG icons should use aria-hidden="true".
  • Reduced-motion preferences disable ripple animation.

Development

From the repository root:

npm run typecheck
npm run build:button

To view the example with a local HTTP server:

python3 -m http.server 8000

Open http://localhost:8000/web/components/button/example/.

License

MIT

Smaller size

Use button--smaller on the component root. Height, padding, text and icon; alias of button--small.

See shared sizing guidance and examples.

Both button--smaller and its existing alias button--small apply the small font size and line height to the button itself as well as .button__label. Direct text and wrapped labels therefore both use 13px text / 18px line height with the shared tokens. Default and large button sizing is unchanged.

Default horizontal padding is .75rem per side for small/smaller, 1.25rem for medium, and 1.5rem for large (an increase of .25rem per side for small/smaller and .5rem for medium/large from the original defaults). Vertical padding and heights are unchanged. Override the existing --button-padding-small, --button-padding-medium or --button-padding-large for custom spacing; Button no longer inherits the generic --control-padding-* defaults.