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# react-resizable-panels
React components for resizable panel groups/layouts
```jsx
import { Panel, PanelGroup, PanelResizeHandle } from "react-resizable-panels";
<PanelGroup autoSaveId="example" direction="horizontal">
<Panel defaultSize={25}>
<SourcesExplorer />
</Panel>
<PanelResizeHandle />
<Panel>
<SourceViewer />
</Panel>
<PanelResizeHandle />
<Panel defaultSize={25}>
<Console />
</Panel>
</PanelGroup>;
```
## 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` <sup>1</sup> |
| `style` | `?CSSProperties` | CSS style to attach to root element |
| `tagName` | `?string = "div"` | HTML element tag name for root element |
<sup>1</sup>: 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. <sup>1</sup> |
| `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 |
<sup>1</sup>: 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
<PanelGroup direction="horizontal">
{renderSideBar && (
<>
<Panel id="sidebar" minSize={25} order={1}>
<Sidebar />
</Panel>
<PanelResizeHandle />
</>
)}
<Panel minSize={25} order={2}>
<Main />
</Panel>
</PanelGroup>
```
### 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 (
<PanelGroup direction="horizontal" id="group">
<Panel id="left-panel">{/* ... */}</Panel>
<PanelResizeHandle id="resize-handle" />
<Panel id="right-panel">{/* ... */}</Panel>
</PanelGroup>
);
}
```
### 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
<PanelResizeHandle className="w-2 bg-blue-800" />
```
### 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 <ClientComponent defaultLayout={defaultLayout} />;
}
```
#### 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 (
<PanelGroup direction="horizontal" onLayout={onLayout}>
<Panel defaultSize={defaultLayout[0]}>{/* ... */}</Panel>
<PanelResizeHandle className="w-2 bg-blue-800" />
<Panel defaultSize={defaultLayout[1]}>{/* ... */}</Panel>
</PanelGroup>
);
}
```
> [!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();
```