# ⌘K [![cmdk minzip package size](https://img.shields.io/bundlephobia/minzip/cmdk)](https://www.npmjs.com/package/cmdk?activeTab=code) [![cmdk package version](https://img.shields.io/npm/v/cmdk.svg?colorB=green)](https://www.npmjs.com/package/cmdk) ⌘K is a command menu React component that can also be used as an accessible combobox. You render items, it filters and sorts them automatically. ⌘K supports a fully composable API ^{^{[How?](/ARCHITECTURE.md)}}, so you can wrap items in other components or even as static JSX. Demo and examples: [cmdk.paco.me](https://cmdk.paco.me) ## Install ```bash pnpm install cmdk ``` ## Use ```tsx import { Command } from 'cmdk' const CommandMenu = () => { return ( No results found. a b c Apple ) } ``` Or in a dialog: ```tsx import { Command } from 'cmdk' const CommandMenu = () => { const [open, setOpen] = React.useState(false) // Toggle the menu when ⌘K is pressed React.useEffect(() => { const down = (e) => { if (e.key === 'k' && (e.metaKey || e.ctrlKey)) { e.preventDefault() setOpen((open) => !open) } } document.addEventListener('keydown', down) return () => document.removeEventListener('keydown', down) }, []) return ( No results found. a b c Apple ) } ``` ## Parts and styling All parts forward props, including `ref`, to an appropriate element. Each part has a specific data-attribute (starting with `cmdk-`) that can be used for styling. ### Command `[cmdk-root]` Render this to show the command menu inline, or use [Dialog](#dialog-cmdk-dialog-cmdk-overlay) to render in a elevated context. Can be controlled with the `value` and `onValueChange` props. > **Note** > > Values are always trimmed with the [trim()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trim) method. ```tsx const [value, setValue] = React.useState('apple') return ( Orange Apple ) ``` You can provide a custom `filter` function that is called to rank each item. Note that the value will be trimmed. ```tsx { if (value.includes(search)) return 1 return 0 }} /> ``` A third argument, `keywords`, can also be provided to the filter function. Keywords act as aliases for the item value, and can also affect the rank of the item. Keywords are trimmed. ```tsx { const extendValue = value + ' ' + keywords.join(' ') if (extendValue.includes(search)) return 1 return 0 }} /> ``` Or disable filtering and sorting entirely: ```tsx {filteredItems.map((item) => { return ( {item} ) })} ``` You can make the arrow keys wrap around the list (when you reach the end, it goes back to the first item) by setting the `loop` prop: ```tsx ``` ### Dialog `[cmdk-dialog]` `[cmdk-overlay]` Props are forwarded to [Command](#command-cmdk-root). Composes Radix UI's Dialog component. The overlay is always rendered. See the [Radix Documentation](https://www.radix-ui.com/docs/primitives/components/dialog) for more information. Can be controlled with the `open` and `onOpenChange` props. ```tsx const [open, setOpen] = React.useState(false) return ( ... ) ``` You can provide a `container` prop that accepts an HTML element that is forwarded to Radix UI's Dialog Portal component to specify which element the Dialog should portal into (defaults to `body`). See the [Radix Documentation](https://www.radix-ui.com/docs/primitives/components/dialog#portal) for more information. ```tsx const containerElement = React.useRef(null) return ( <>

) ``` ### Input `[cmdk-input]` All props are forwarded to the underlying `input` element. Can be controlled with the `value` and `onValueChange` props. ```tsx const [search, setSearch] = React.useState('') return ``` ### List `[cmdk-list]` Contains items and groups. Animate height using the `--cmdk-list-height` CSS variable. ```css [cmdk-list] { min-height: 300px; height: var(--cmdk-list-height); max-height: 500px; transition: height 100ms ease; } ``` To scroll item into view earlier near the edges of the viewport, use scroll-padding: ```css [cmdk-list] { scroll-padding-block-start: 8px; scroll-padding-block-end: 8px; } ``` ### Item `[cmdk-item]` `[data-disabled?]` `[data-selected?]` Item that becomes active on pointer enter. You should provide a unique `value` for each item, but it will be automatically inferred from the `.textContent`. ```tsx console.log('Selected', value)} // Value is implicity "apple" because of the provided text content > Apple ``` You can also provide a `keywords` prop to help with filtering. Keywords are trimmed. ```tsx Apple ``` ```tsx console.log('Selected', value)} // Value is implicity "apple" because of the provided text content > Apple ``` You can force an item to always render, regardless of filtering, by passing the `forceMount` prop. ### Group `[cmdk-group]` `[hidden?]` Groups items together with the given `heading` (`[cmdk-group-heading]`). ```tsx Apple ``` Groups will not unmount from the DOM, rather the `hidden` attribute is applied to hide it from view. This may be relevant in your styling. You can force a group to always render, regardless of filtering, by passing the `forceMount` prop. ### Separator `[cmdk-separator]` Visible when the search query is empty or `alwaysRender` is true, hidden otherwise. ### Empty `[cmdk-empty]` Automatically renders when there are no results for the search query. ### Loading `[cmdk-loading]` You should conditionally render this with `progress` while loading asynchronous items. ```tsx const [loading, setLoading] = React.useState(false) return {loading && Hang on…} ``` ### `useCommandState(state => state.selectedField)` Hook that composes [`useSyncExternalStore`](https://reactjs.org/docs/hooks-reference.html#usesyncexternalstore). Pass a function that returns a slice of the command menu state to re-render when that slice changes. This hook is provided for advanced use cases and should not be commonly used. A good use case would be to render a more detailed empty state, like so: ```tsx const search = useCommandState((state) => state.search) return No results found for "{search}". ``` ## Examples Code snippets for common use cases. ### Nested items Often selecting one item should navigate deeper, with a more refined set of items. For example selecting "Change theme…" should show new items "Dark theme" and "Light theme". We call these sets of items "pages", and they can be implemented with simple state: ```tsx const ref = React.useRef(null) const [open, setOpen] = React.useState(false) const [search, setSearch] = React.useState('') const [pages, setPages] = React.useState([]) const page = pages[pages.length - 1] return ( { // Escape goes to previous page // Backspace goes to previous page when search is empty if (e.key === 'Escape' || (e.key === 'Backspace' && !search)) { e.preventDefault() setPages((pages) => pages.slice(0, -1)) } }} > {!page && ( <> setPages([...pages, 'projects'])}>Search projects… setPages([...pages, 'teams'])}>Join a team… )} {page === 'projects' && ( <> Project A Project B )} {page === 'teams' && ( <> Team 1 Team 2 )} ) ``` ### Show sub-items when searching If your items have nested sub-items that you only want to reveal when searching, render based on the search state: ```tsx const SubItem = (props) => { const search = useCommandState((state) => state.search) if (!search) return null return } return ( Change theme… Change theme to dark Change theme to light ) ``` ### Asynchronous results Render the items as they become available. Filtering and sorting will happen automatically. ```tsx const [loading, setLoading] = React.useState(false) const [items, setItems] = React.useState([]) React.useEffect(() => { async function getItems() { setLoading(true) const res = await api.get('/dictionary') setItems(res) setLoading(false) } getItems() }, []) return ( {loading && Fetching words…} {items.map((item) => { return ( {item} ) })} ) ``` ### Use inside Popover We recommend using the [Radix UI popover](https://www.radix-ui.com/docs/primitives/components/popover) component. ⌘K relies on the Radix UI Dialog component, so this will reduce your bundle size a bit due to shared dependencies. ```bash $ pnpm install @radix-ui/react-popover ``` Render `Command` inside of the popover content: ```tsx import * as Popover from '@radix-ui/react-popover' return ( Toggle popover Apple ) ``` ### Drop in stylesheets You can find global stylesheets to drop in as a starting point for styling. See [website/styles/cmdk](website/styles/cmdk) for examples. ## FAQ **Accessible?** Yes. Labeling, aria attributes, and DOM ordering tested with Voice Over and Chrome DevTools. [Dialog](#dialog-cmdk-dialog-cmdk-overlay) composes an accessible Dialog implementation. **Virtualization?** No. Good performance up to 2,000-3,000 items, though. Read below to bring your own. **Filter/sort items manually?** Yes. Pass `shouldFilter={false}` to [Command](#command-cmdk-root). Better memory usage and performance. Bring your own virtualization this way. **React 18 safe?** Yes, required. Uses React 18 hooks like `useId` and `useSyncExternalStore`. **Unstyled?** Yes, use the listed CSS selectors. **Hydration mismatch?** No, likely a bug in your code. Ensure the `open` prop to `Command.Dialog` is `false` on the server. **React strict mode safe?** Yes. Open an issue if you notice an issue. **Weird/wrong behavior?** Make sure your `Command.Item` has a `key` and unique `value`. **Concurrent mode safe?** Maybe, but concurrent mode is not yet real. Uses risky approaches like manual DOM ordering. **React server component?** No, it's a client component. **Listen for ⌘K automatically?** No, do it yourself to have full control over keybind context. **React Native?** No, and no plans to support it. If you build a React Native version, let us know and we'll link your repository here. ## History Written in 2019 by Paco ([@pacocoursey](https://twitter.com/pacocoursey)) to see if a composable combobox API was possible. Used for the Vercel command menu and autocomplete by Rauno ([@raunofreiberg](https://twitter.com/raunofreiberg)) in 2020. Re-written independently in 2022 with a simpler and more performant approach. Ideas and help from Shu ([@shuding\_](https://twitter.com/shuding_)). [use-descendants](https://github.com/pacocoursey/use-descendants) was extracted from the 2019 version. ## Testing First, install dependencies and Playwright browsers: ```bash pnpm install pnpm playwright install ``` Then ensure you've built the library: ```bash pnpm build ``` Then run the tests using your local build against real browser engines: ```bash pnpm test ```