# react-resizable-panels React components for resizable panel groups/layouts ```jsx import { Panel, PanelGroup, PanelResizeHandle } from "react-resizable-panels"; ; ``` ## If you like this project, 🎉 [become a sponsor](https://github.com/sponsors/bvaughn/) or ☕ [buy me a coffee](http://givebrian.coffee/) ## Props ### `PanelGroup` | prop | type | description | | :----------- | :--------------------------- | :--------------------------------------------------------------- | | `autoSaveId` | `?string` | Unique id used to auto-save group arrangement via `localStorage` | | `children` | `ReactNode` | Arbitrary React element(s) | | `className` | `?string` | Class name to attach to root element | | `direction` | `"horizontal" \| "vertical"` | Group orientation | | `id` | `?string` | Group id; falls back to `useId` when not provided | | `onLayout` | `?(sizes: number[]) => void` | Called when group layout changes | | `storage` | `?PanelGroupStorage` | Custom storage API; defaults to `localStorage` ¹ | | `style` | `?CSSProperties` | CSS style to attach to root element | | `tagName` | `?string = "div"` | HTML element tag name for root element | ¹: Storage API must define the following _synchronous_ methods: - `getItem: (name:string) => string` - `setItem: (name: string, value: string) => void` `PanelGroup` components also expose an imperative API for manual resizing: | method | description | | :---------------------------- | :--------------------------------------------------------------- | | `getId(): string` | Gets the panel group's ID. | | `getLayout(): number[]` | Gets the panel group's current _layout_ (`[1 - 100, ...]`). | | `setLayout(layout: number[])` | Resize panel group to the specified _layout_ (`[1 - 100, ...]`). | ### `Panel` | prop | type | description | | :-------------- | :------------------------ | :-------------------------------------------------------------------------------------------- | | `children` | `ReactNode` | Arbitrary React element(s) | | `className` | `?string` | Class name to attach to root element | | `collapsedSize` | `?number=0` | Panel should collapse to this size | | `collapsible` | `?boolean=false` | Panel should collapse when resized beyond its `minSize` | | `defaultSize` | `?number` | Initial size of panel (numeric value between 1-100) | | `id` | `?string` | Panel id (unique within group); falls back to `useId` when not provided | | `maxSize` | `?number = 100` | Maximum allowable size of panel (numeric value between 1-100); defaults to `100` | | `minSize` | `?number = 10` | Minimum allowable size of panel (numeric value between 1-100); defaults to `10` | | `onCollapse` | `?() => void` | Called when panel is collapsed | | `onExpand` | `?() => void` | Called when panel is expanded | | `onResize` | `?(size: number) => void` | Called when panel is resized; `size` parameter is a numeric value between 1-100. ¹ | | `order` | `?number` | Order of panel within group; required for groups with conditionally rendered panels | | `style` | `?CSSProperties` | CSS style to attach to root element | | `tagName` | `?string = "div"` | HTML element tag name for root element | ¹: If any `Panel` has an `onResize` callback, the `order` prop should be provided for all `Panel`s. `Panel` components also expose an imperative API for manual resizing: | method | description | | :----------------------- | :--------------------------------------------------------------------------------- | | `collapse()` | If panel is `collapsible`, collapse it fully. | | `expand()` | If panel is currently _collapsed_, expand it to its most recent size. | | `getId(): string` | Gets the ID of the panel. | | `getSize(): number` | Gets the current size of the panel as a percentage (`1 - 100`). | | `isCollapsed(): boolean` | Returns `true` if the panel is currently _collapsed_ (`size === 0`). | | `isExpanded(): boolean` | Returns `true` if the panel is currently _not collapsed_ (`!isCollapsed()`). | | `getSize(): number` | Returns the most recently committed size of the panel as a percentage (`1 - 100`). | | `resize(size: number)` | Resize panel to the specified _percentage_ (`1 - 100`). | ### `PanelResizeHandle` | prop | type | description | | :--------------- | :-------------------------------------------- | :------------------------------------------------------------------------------ | | `children` | `?ReactNode` | Custom drag UI; can be any arbitrary React element(s) | | `className` | `?string` | Class name to attach to root element | | `hitAreaMargins` | `?{ coarse: number = 15; fine: number = 5; }` | Allow this much margin when determining resizable handle hit detection | | `disabled` | `?boolean` | Disable drag handle | | `id` | `?string` | Resize handle id (unique within group); falls back to `useId` when not provided | | `onDragging` | `?(isDragging: boolean) => void` | Called when group layout changes | | `style` | `?CSSProperties` | CSS style to attach to root element | | `tagName` | `?string = "div"` | HTML element tag name for root element | --- ## FAQ ### Can panel sizes be specified in pixels? No. Pixel-based constraints [added significant complexity](https://github.com/bvaughn/react-resizable-panels/pull/176) to the initialization and validation logic and so I've decided not to support them. You may be able to implement a version of this yourself following [a pattern like this](https://github.com/bvaughn/react-resizable-panels/issues/46#issuecomment-1368108416) but it is not officially supported by this library. ### How can I fix layout/sizing problems with conditionally rendered panels? The `Panel` API doesn't _require_ `id` and `order` props because they aren't necessary for static layouts. When panels are conditionally rendered though, it's best to supply these values. ```tsx {renderSideBar && ( <> )}

``` ### Can a attach a ref to the DOM elements? No. I think exposing two refs (one for the component's imperative API and one for a DOM element) would be awkward. This library does export several utility methods for accessing the underlying DOM elements though. For example: ```tsx import { getPanelElement, getPanelGroupElement, getResizeHandleElement, Panel, PanelGroup, PanelResizeHandle, } from "react-resizable-panels"; export function Example() { const refs = useRef(); useEffect(() => { const groupElement = getPanelGroupElement("group"); const leftPanelElement = getPanelElement("left-panel"); const rightPanelElement = getPanelElement("right-panel"); const resizeHandleElement = getResizeHandleElement("resize-handle"); // If you want to, you can store them in a ref to pass around refs.current = { groupElement, leftPanelElement, rightPanelElement, resizeHandleElement, }; }, []); return ( {/* ... */} {/* ... */} ); } ``` ### Why don't I see any resize UI? This likely means that you haven't applied any CSS to style the resize handles. By default, a resize handle is just an empty DOM element. To add styling, use the `className` or `style` props: ```tsx // Tailwind example ``` ### Can panel sizes be persistent? Yes. Panel groups with an `autoSaveId` prop will automatically save and restore their layouts on mount. ### How can I use persistent layouts with SSR? By default, this library uses `localStorage` to persist layouts. With server rendering, this can cause a flicker when the default layout (rendered on the server) is replaced with the persisted layout (in `localStorage`). The way to avoid this flicker is to also persist the layout with a cookie like so: #### Server component ```tsx import ResizablePanels from "@/app/ResizablePanels"; import { cookies } from "next/headers"; export function ServerComponent() { const layout = cookies().get("react-resizable-panels:layout"); let defaultLayout; if (layout) { defaultLayout = JSON.parse(layout.value); } return ; } ``` #### Client component ```tsx "use client"; import { Panel, PanelGroup, PanelResizeHandle } from "react-resizable-panels"; export function ClientComponent({ defaultLayout = [33, 67], }: { defaultLayout: number[] | undefined; }) { const onLayout = (sizes: number[]) => { document.cookie = `react-resizable-panels:layout=${JSON.stringify(sizes)}`; }; return ( {/* ... */} {/* ... */} ); } ``` > [!NOTE] > Be sure to specify a `defaultSize` prop for **every** `Panel` component to avoid layout flicker. A demo of this is available [here](https://github.com/bvaughn/react-resizable-panels-demo-ssr). #### How can I set the [CSP `"nonce"`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/nonce) attribute? ```js import { setNonce } from "react-resizable-panels"; setNonce("your-nonce-value-here"); ``` #### How can I disable global cursor styles? ```js import { disableGlobalCursorStyles } from "react-resizable-panels"; disableGlobalCursorStyles(); ```

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