Button

A button triggers an action. It is Headless UI's Button with the ZUI variants and sizes on top: the box comes from the control tokens, the colours from the semantic pairs, so a retheme moves every button at once.

import Button from '@zuilib/components/button'

Variants

Loading example

Sizes

sm, md and lg take their height from --control-height-* and their padding from --button-padding-x-*. icon is a square the height of an md control for a lone glyph; give it an aria-label.

Loading example

Icons

leadingIcon and trailingIcon are wrapped in an aria-hidden span and sized 1em unless the SVG carries a size-* class.

Loading example

Loading and disabled

loading swaps the leading icon for a spinner, announces loadingText, sets aria-busy and swallows clicks, but keeps the button focusable so keyboard focus is not lost when a click flips it to loading. disabled uses the native attribute on a <button> and aria-disabled on any other tag.

Loading example

As a link

as renders another tag or component and types its props: href on an anchor, to on a router Link. A disabled non-button gets aria-disabled and leaves the tab order.

Loading example

Full width

Loading example

Props

ButtonProps<TTag> extends Headless UI ButtonProps<TTag> (onClick, disabled, type, autoFocus, …) with:

Prop	Type	Default	Description
variant	'primary' | 'secondary' | 'destructive' | 'outline' | 'ghost' | 'link'	'primary'
size	'sm' | 'md' | 'lg' | 'icon'	'md'	icon is a square the height of an md control
fullWidth	boolean	false	w-full on the root
loading	boolean	false	Spinner, aria-busy, clicks swallowed; stays focusable
loadingText	string	'Loading'	Visually hidden text announced with the spinner
leadingIcon	ReactNode	—	Before the children; replaced by the spinner while loading
trailingIcon	ReactNode	—	After the children
disabled	boolean	false	Native attribute on <button>; aria-disabled + tabIndex -1 on any other tag
as	ElementType	'button'	Polymorphic tag or component; its props are typed
className	string	—	Merged last, after the variant and size classes

Slots

Slot	Element	Notes
[data-slot="button"]	button (or as)	Root. Also data-variant, data-size, data-loading
[data-slot="button-spinner"]	svg	Present while loading
[data-slot="button-leading-icon"]	span	Wraps leadingIcon; aria-hidden
[data-slot="button-trailing-icon"]	span	Wraps trailingIcon; aria-hidden
[data-slot="button-content"]	span	The children, visually hidden, on an icon-size button while loading

/* Consumer CSS: square primary buttons only */
[data-slot="button"][data-variant="primary"] {
  border-radius: 0;
}

Tokens

Token	Used for
--control-height-sm/md/lg	Height per size; icon is --control-height-md square
--button-padding-x-sm/md/lg	Horizontal padding per size
--radius-md	Corner radius (from --radius)
--primary, --secondary, --destructive, --accent, --input, --background and their -foreground pairs	Variant colours
--ring	Keyboard focus ring
--duration-fast	Colour transition

Accessibility

• Renders a real <button type="button"> by default; pass type="submit" in forms.
• Keyboard focus shows a 2px --ring ring offset by 2px of --background (focus-visible only; no ring on mouse click).
• loading sets aria-busy and aria-disabled and keeps the element focusable; loadingText is read by screen readers.
• Icon-only buttons need an aria-label. Decorative icons are aria-hidden by the wrapper.
• A disabled anchor or Link gets aria-disabled="true" and tabIndex={-1}.

Related

• AIButton: the same button with a sparkle and a generating state.
• Menu and Popover: buttons that open panels.
• Theming: retheme every button through the control tokens.