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npm i @accessible/modal

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An accessible and versatile modal component for React

Features

• Style-agnostic You can use this component with the styling library of your choice. It works with CSS-in-JS, SASS, plain CSS, plain style objects, anything!
• Portal-friendly The modal target will render into React portals of your choice when configured to do so.
• a11y/aria-compliant This component works with screen readers out of the box and manages focus for you.

Quick Start

Check out the example on CodeSandbox

import * as React from 'react'
import * as Modal from '@accessible/modal'

const Component = () => (
  <Modal.Modal>
    <Modal.Trigger>
      <button>Open me</button>
    </Modal.Trigger>

    <Modal.Target>
      <div className='my-modal'>
        <Modal.CloseButton>
          <button>Close me</button>
        </Modal.CloseButton>

        <div>You did a thing</div>
      </div>
    </Modal.Target>
  </Modal.Modal>
)

API

Components

Component	Description
<Modal>	This component creates the context for your modal target and trigger and contains some configuration options.
<Target>	This component wraps any React element and turns it into a modal target.
<Trigger>	This component wraps any React element and turns it into a modal trigger.
<CloseButton>	This is a convenience component that wraps any React element and adds an onClick handler to close the modal.

Hooks

Hook	Description
useModal()	This hook provides the value of the modal's ModalContextValue object.
useA11yTarget()	A React hook for creating a headless modal target to WAI-ARIA authoring practices.
useA11yTrigger()	A React hook for creating a headless modal trigger to WAI-ARIA authoring practices.
useA11yCloseButton()	A React hook for creating a headless close button to WAI-ARIA authoring practices.

<Modal>

This component creates the context for your modal target and trigger and contains some configuration options.

Props

Prop	Type	Default	Required?	Description
defaultOpen	boolean	false	No	This sets the default open state of the modal. By default the modal is closed.
open	boolean	undefined	No	This creates a controlled modal component where the open state of the modal is controlled by this property.
onChange	(open: boolean) => void	undefined	No	This callback is invoked any time the open state of the modal changes.
id	string	undefined	No	By default this component creates a unique id for you, as it is required for certain aria attributes. Supplying an id here overrides the auto id feature.
children	React.ReactNode	undefined	No	Your modal contents and any other children.

useA11yTarget(target, options?)

A React hook for creating a headless modal target to WAI-ARIA authoring practices.

Arguments

Argument	Type	Required?	Description
target	React.RefObject<T> | T | null	Yes	A React ref or HTML element
options	UseA11yTargetOptions	No	Configuration options

UseA11yTargetOptions

export interface UseA11yTargetOptions {
  /**
   * Adds this class name to props when the modal is open
   */
  openClass?: string
  /**
   * Adds this class name to props when the modal is closed
   */
  closedClass?: string
  /**
   * Adds this style to props when the modal is open
   */
  openStyle?: React.CSSProperties
  /**
   * Adds this style to props when the modal is closed
   */
  closedStyle?: React.CSSProperties
  /**
   * Prevents the `window` from scrolling when the target is
   * focused after opening.
   */
  preventScroll?: boolean
  /**
   * When `true`, this closes the target element when the `Escape`
   * key is pressed.
   * @default true
   */
  closeOnEscape?: boolean
}

Returns

interface A11yProps {
  readonly role: 'dialog'
  readonly 'aria-hidden': boolean
  readonly id: string | undefined
  readonly className: string | undefined
  readonly style: {
    readonly visibility: 'hidden' | 'visible'
    readonly position: 'fixed'
    readonly margin: 'auto'
    readonly left: '50%'
    readonly top: '50%'
    readonly transform: 'translate3d(-50%, -50%, 0)'
  }
}

Example

import * as React from 'react'
import {useA11yTarget} from '@accessible/modal'

const MyTarget = () => {
  const ref = React.useRef(null)
  const a11yProps = useA11yTarget(ref, {closeOnEscape: false})

  return (
    <div ref={ref} {...a11yProps}>
      I am the modal dialog
    </div>
  )
}

<Target>

This component wraps any React element and turns it into a modal target.

Props

Prop	Type	Default	Required?	Description
portal	boolean | string | PortalizeProps	false	No	When true this will render the modal into a React portal with the id #portals. You can render it into any portal by providing its query selector here, e.g. #foobar, [data-portal=true], or .foobar.
closeOnEscape	boolean	true	No	By default the modal will close when the Escape key is pressed. You can turn this off by providing false here.
closedClass	string	undefined	No	This class name will be applied to the child element when the modal is closed.
openClass	string	undefined	No	This class name will be applied to the child element when the modal is open.
closedStyle	React.CSSProperties	undefined	No	These styles will be applied to the child element when the modal is closed in addition to the default styles that set the target's visibility.
openStyle	React.CSSProperties	undefined	No	These styles name will be applied to the child element when the modal is open in addition to the default styles that set the target's visibility.
preventScroll	boolean	false	No	When true this will prevent your browser from scrolling the document to bring the newly-focused tab into view.
children	React.ReactElement	undefined	Yes	The child is cloned by this component and has aria attributes injected into its props as well as the events defined above.

Example

<Target>
  <div className='alert'>Alert</div>
</Target>

useA11yTrigger(target, options?)

A React hook for creating a headless modal trigger to WAI-ARIA authoring practices. In addition to providing accessibility props to your component, this hook will add events for interoperability between actual elements and fake ones e.g. and

to the target element

Arguments

Argument	Type	Required?	Description
target	React.RefObject<T> | T | null	Yes	A React ref or HTML element
options	UseA11yTriggerOptions	No	Configuration options

UseA11yTriggerOptions

export interface UseA11yTriggerOptions {
  /**
   * Adds this class name to props when the modal is open
   */
  openClass?: string
  /**
   * Adds this class name to props when the modal is closed
   */
  closedClass?: string
  /**
   * Adds this style to props when the modal is open
   */
  openStyle?: React.CSSProperties
  /**
   * Adds this style to props when the modal is closed
   */
  closedStyle?: React.CSSProperties
  /**
   * Adds an onClick handler in addition to the default one that
   * toggles the modal's open state.
   */
  onClick?: (e: MouseEvent) => any
}

Returns

interface A11yProps<E extends React.MouseEvent<any, MouseEvent>> {
  readonly 'aria-haspopup': 'dialog'
  readonly 'aria-controls': string | undefined
  readonly 'aria-expanded': boolean
  readonly role: 'button'
  readonly tabIndex: 0
  readonly className: string | undefined
  readonly style: React.CSSProperties | undefined
}

Example

import * as React from 'react'
import {useA11yTrigger} from '@accessible/modal'

const MyTrigger = () => {
  const ref = React.useRef(null)
  const a11yProps = useA11yTrigger(ref, {
    openClass: 'open',
    closedClass: 'closed',
  })

  return (
    <button ref={ref} {...a11yProps}>
      Clicking me toggles the modal dialog
    </button>
  )
}

<Trigger>

This component wraps any React element and adds an onClick handler which toggles the open state of the modal target.

Props

Prop	Type	Default	Required?	Description
closedClass	string	undefined	No	This class name will be applied to the child element when the modal is closed.
openClass	string	undefined	No	This class name will be applied to the child element when the modal is open.
closedStyle	React.CSSProperties	undefined	No	These styles will be applied to the child element when the modal is closed.
openStyle	React.CSSProperties	undefined	No	These styles name will be applied to the child element when the modal is open.
children	React.ReactElement	undefined	Yes	The child is cloned by this component and has aria attributes injected into its props as well as the events defined above.

<Trigger on='click'>
  <button className='my-button'>Open me!</button>
</Trigger>

useA11yCloseButton(target, options?)

A React hook for creating a headless close button to WAI-ARIA authoring practices. In addition to providing accessibility props to your component, this hook will add events for interoperability between actual

elements and fake ones e.g. and

to the target element

Arguments

Argument	Type	Required?	Description
target	React.RefObject<T> | T | null	Yes	A React ref or HTML element
options	UseA11yCloseButtonOptions	No	Configuration options

UseA11yCloseButtonOptions

export interface UseA11yCloseButtonOptions {
  /**
   * Adds an onClick handler in addition to the default one that
   * closes the modal.
   */
  onClick?: (e: MouseEvent) => any
}

Returns

interface A11yProps<E extends React.MouseEvent<any, MouseEvent>> {
  readonly 'aria-haspopup': 'dialog'
  readonly 'aria-controls': string | undefined
  readonly 'aria-expanded': boolean
  readonly 'aria-label': 'Close'
  readonly role: 'button'
  readonly tabIndex: 0
}

Example

import * as React from 'react'
import {useA11yCloseButton} from '@accessible/modal'

const MyTrigger = () => {
  const ref = React.useRef(null)
  const a11yProps = useA11yCloseButton(ref, {
    onClick: () => console.log('Closing!'),
  })

  return (
    <button ref={ref} {...a11yProps}>
      Clicking me closes the modal dialog
    </button>
  )
}

<CloseButton>

This is a convenience component that wraps any React element and adds an onClick handler which closes the modal.

Props

Prop	Type	Default	Required?	Description
children	React.ReactElement	undefined	Yes	The child is cloned by this component and has aria attributes injected into its props as well as the events defined above.

<CloseButton>
  <button className='my-button'>Close me</button>
</CloseButton>

useModal()

This hook provides the value of the modal's ModalContextValue object

ModalContextValue

export interface ModalContextValue {
  /**
   * The open state of the modal
   */
  isOpen: boolean
  /**
   * Opens the modal
   */
  open: () => void
  /**
   * Closes the modal
   */
  close: () => void
  /**
   * Toggles the open state of the modal
   */
  toggle: () => void
  /**
   * A unique ID for the modal target
   */
  id?: string
}

Example

const Component = () => {
  const {open, close, toggle, isOpen} = useModal()
  return <button onClick={toggle}>Toggle the modal</button>
}

LICENSE

MIT