Button

To implement Button component into your project you’ll need to add the import:

import Button from "@kiwicom/orbit-components/lib/Button";

After adding import into your project you can use it simply like:

<Button>Hello World!</Button>

Props

Table below contains all types of the props available in Button component.

Name	Type	Default	Description
ariaControls	`string`		Id of the element the button controls.
ariaExpanded	`boolean`		Tells screen reader the controlled element from `ariaControls` is expanded
asComponent	`string \\| React.Element`	`"button"`	The component used for the root node.
fullWidth	`boolean`	`false`	If `true`, the Button will grow up to the full width of its container.
centered	`boolean`	`false`	Can only be used when `fullWidth` is true and if `iconLeft` and/or `iconRight` are defined. If `centered` prop is `true`, the Button will center everything.
circled	`boolean`	`false`	If `true`, the Button will have circular shape.
children	`React.Node`		The content of the Button. See Functional specs
dataTest	`string`		Optional prop for testing purposes.
id	`string`		Set `id` for `Button`
disabled	`boolean`	`false`	If `true`, the Button will be disabled.
download	`boolean \\| string`		Can only be used when `href` is defined. Adds the `download` attribute to the the anchor element.
external	`boolean`	`false`	If `true`, the Button opens link in a new tab. See Functional specs
href	`string`		The URL of the link to open when Button is clicked. See Functional specs
iconLeft	`React.Node`		The displayed icon on the left.
iconRight	`React.Node`		The displayed icon on the right.
loading	`boolean`	`false`	If `true`, the loading glyph will be displayed.
onClick	`event => void \\| Promise`		Function for handling onClick event.
ref	`func`		Prop for forwarded ref of the Button.
rel	`string`		Specifies the rel of an element. See Functional specs
role	`string`		Specifies the role of an element.
size	`enum`	`"normal"`	The size of the Button.
spaceAfter	`enum`		Additional `margin-bottom` after component.
submit	`boolean`	`false`	If `true`, the Button will have `type="submit"` attribute, otherwise `type="button"`.
tabIndex	`string \\| number`		Specifies the tab order of an element.
title	`string`		Adds `aria-label`.
type	`enum`	`"primary"`	The type of Button.
width	`string`		The width of the Button. Can be any string - `100px`, `20%`.

enum

type	size	spaceAfter
`"primary"`	`"small"`	`"none"`
`"secondary"`	`"normal"`	`"smallest"`
`"critical"`	`"large"`	`"small"`
`"white"`		`"normal"`
`"primarySubtle"`		`"medium"`
`"criticalSubtle"`		`"large"`
`"bundleBasic"`		`"largest"`
`"bundleMedium"`
`"bundleTop"`

Functional specs

When the external is specified, noopener value will be automatically added to attribute rel for security reason. Read more about it here.

By passing the href prop into Button, it will render into a element. If you pass asComponent prop it will override this logic.

If you want to render Icon only Button, you just need to let children prop empty and set up any icon you want to use.

If you want to use the asComponent prop then YourComponent should accept at least className. Otherwise it won’t be rendered with proper styling, e.g.:
```
const YourComponent = props => <div {...props} />
<Button asComponent={YourComponent}>Title</Button>
```
If you specify the children of YourComponent component, it will override the children prop of Button component, e.g.:
```
const YourComponent = props => <div {...props}>YourComponent</div>;
```

By default, a full width Button renders with the children centered. However, if iconLeft and/or iconRight are defined, the content will align to the left by default. In such scenario, the centered prop can be used to center everything.

Accessibility

A button is mainly used for indicating an action, submitting a data, opening a modal etc. If you want to use Button for navigation consider using a <TextLink> for that.

Use ariaControls prop to add aria-controls attribute to establish the relationship between button and element which is controlled by it. aria-controls works only with a unique id of an element.
Use ariaExpands prop to add aria-expands to indicate screenreaders, that element controlled by button through ariaControls is expanded or not.
Use disabled prop to indicate users that button is inactive and they can’t interact with it.
Use role and tabIndex when you are rendering Button to non-actionable HTML element as div or span. However, this should be done only in edge-cases as it is anti-pattern behavior.
Use title to add aria-label when you need to add extra informations to screen readers or there is no children presented to be used as label.