@accessible/tabs

---

@accessible/tabs

🅰 An accessible and versatile tabs component for React with keyboard navigation and labeling features taught in w3.org's WAI-ARIA tabs example

npm i @accessible/tabs

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An accessible and versatile tabs component for React modeled after the WAI-ARIA example taught here.

Quick Start

Check out the example on CodeSandbox

import {Tabs, TabList, Tab, Panel} from '@accessible/tabs'

const Component = () => (
  <Tabs defaultActive={0} manualActivation>
    <TabList>
      <div aria-label='Some research thing'>
        <Tab>
          <button>Abstract</button>
        </Tab>
        <Tab>
          <button>References</button>
        </Tab>
      </div>
    </TabList>

    <Panel>
      <div>Abstract body</div>
    </Panel>
    <Panel>
      <div>References body</div>
    </Panel>
  </Tabs>
)

API

Components

Component	Description
<Tabs>	This component creates the context for your tabs and contains some configuration options. You'll need to add <Tab> and <Panel> as children in order to actually create tabs.
<TabList>	The component adds role='tablist' to its child component.
<Tab>	This component clones any React element and turns it into a tab that controls the visible state of a <Panel>. It must be a child of <Tabs> and all tabs must be adjacent in the tree. Each tab has a corresponding <Panel> that shares the same index.
<Panel>	This component clones its child and turns it into a panel that corresponds to a <Tab> with the same index. All panels must be adjacent in the tree unless an index prop is defined.

Hooks

Hook	Description
useTabs()	This hook returns the value of the TabsContext object.
useTab()	This hook returns the value of the TabContext object.

<Tabs>

This component creates the context for your tabs and contains some configuration options. You'll need to add <Tab> and <Panel> as children in order to actually create tabs.

Props

Prop	Type	Default	Required?	Description
defaultActive	number	0	No	The <Tab> index you want active by default.
active	number	undefined	No	Makes this a controlled component where the activate control has no effect. The tab index defined here is always the one that is active.
manualActivation	boolean	false	No	By default this component opens tabs automatically when using keyboard navigation to switch between tabs. By setting this to true, the user will have to use the space or enter key to activate the tab after the tab is focused.
preventScroll	boolean	false	No	When true this will prevent your browser from scrolling the document to bring the newly-focused tab into view.
onChange	(active: number) => void	undefined	No	Called each time the active tab changes. It provides the active tab index as its only argument.
children	React.ReactNode[]	undefined	Yes	You can define any children here with some caveats listed elsewhere.

<TabList>

Props

Prop	Type	Default	Required?	Description
children	React.ReactElement	undefined	Yes	The child is cloned by this component and given a property for role='tablist'.

<Tab>

This component clones any React element and turns it into a tab that controls the visible state of a <Panel>. It must be a child of <Tabs> and all tabs must be adjacent in the tree. Each tab has a corresponding <Panel> that shares the same index.

// YES
const MyTabs = () => (
  <Tabs>
    <TabList>
      {/* index: 0 */}
      <Tab>
        <div />
      </Tab>
      {/* index: 1 */}
      <Tab>
        <div />
      </Tab>
    </TabList>
    {/* index: 0 */}
    <Panel>
      <div />
    </Panel>
    {/* index: 1 */}
    <Panel>
      <div />
    </Panel>
  </Tabs>
)

// ABSOLUTELY NOT
const MyTabs = () => (
  <Tabs>
    <TabList>
      {/* The Tab components here are not adjacent in the tree. */}
      <div>
        <Tab>
          <div />
        </Tab>
      </div>
      <div>
        <Tab>
          <div />
        </Tab>
      </div>
    </TabList>
    <Panel>
      <div />
    </Panel>
    <Panel>
      <div />
    </Panel>
  </Tabs>
)

Props

Prop	Type	Default	Required?	Description
activeClass	string	undefined	No	Adds this class to the child component when the tab is in an active state.
inactiveClass	string	undefined	No	Adds this class to the child component when the tab is in an inactive state.
activeStyle	React.CSSProperties	undefined	No	Adds these styles to the child component when the tab is in an active state.
inactiveStyle	React.CSSProperties	undefined	No	Adds these styles to the child component when the tab is in an inactive state.
id	string	undefined	No	Defining an ID here overrides the auto id generated for aria attributes.
disabled	boolean	false	No	Setting this to true will prevent the tab from activating if it isn't already active.
index	number	undefined	No	Setting an index here overrides the default index created when this component mounts. Indexes are used to match tabs to their corresponding <Panel>. I would recommend not setting this property and letting the library handle it automatically.
onDelete	(event: KeyboardEvent) => void	undefined	No	This callback will fire if a user presses the Delete key on their keyboard when this tab (not the panel) is focused.
children	React.ReactElement	undefined	Yes	The child is cloned by this component and has aria attributes injected into its props as well as keyboard event handlers for navigating between tabs.

<Panel>

This component clones its child and turns it into a panel that corresponds to a <Tab> with the same index. All panels must be adjacent in the tree unless an index prop is defined. For example:

<Tabs>
  <TabList>
    [0] <Tab>
    [1] <Tab>
  </TabList>

  [0] <Panel>
  [1] <Panel>
</Tabs>

Props

Prop	Type	Default	Required?	Description
activeClass	string	undefined	No	Adds this class to the child component when the panel's <Tab> is in an active state.
inactiveClass	string	undefined	No	Adds this class to the child component when the panel's <Tab> is in an inactive state.
activeStyle	React.CSSProperties	undefined	No	Adds these styles to the child component when the panel's <Tab> is in an active state.
inactiveStyle	React.CSSProperties	undefined	No	Adds these styles to the child component when the panel's <Tab> is in an inactive state.
index	number	undefined	No	Setting an index here overrides the default index created when this component mounts. Indexes are used to match panels to their corresponding <Tab>. I would recommend not setting this property and letting the library handle it automatically.
children	React.ReactElement	undefined	Yes	The child is cloned by this component and has aria attributes injected into its props and will have its visible state controlled by the <Tab> component with the same index.

useTab(index: number)

Returns TabContext object for the <Tab> corresponding to the provided index. It must be used within a child of <Tabs>.

TabContextValue

interface TabContextValue {
  // The ID used for aria attributes
  id?: string
  // A ref to the tab's underlying element
  tabRef?: HTMLElement
  // The index of the tab
  index: number
  // Activates this tab unless `disabled` is `true`
  activate: () => void
  // Is this tab active?
  isActive: boolean
  // Is this tab disabled?
  disabled: boolean
}

useTabs()

This hook returns the value of the TabsContext object. This hook must be within a child of <Tabs>.

TabsContextValue

interface TabsContextValue {
  // An array of tabs that have been registered
  tabs: TabState[]
  // Registers a new tab
  registerTab: (
    index: number,
    element: HTMLElement,
    id?: string,
    disabled?: boolean
  ) => () => void
  // The tab that is currently active
  active: number | undefined
  // Activates the tab at `index`
  activate: (index: number | undefined) => void
  // Is manual activation configured?
  manualActivation: boolean
}

type TabState =
  | {
      element?: HTMLElement
      id?: string
      disabled?: boolean
    }
  | undefined

LICENSE

MIT