- items: Array. List data.
- renderItem: (item, index: number) => ReactNode. Rendering function for each item in the list. Index is the index of the list item in the whole list.

props (optional)

- itemSize: number. Estimated height of a single item in the list.
- buffer: number. Additional space outside the visible area of the virtual list to render.
- persistentIndices: number[]. Array of indices of items to be persistently rendered. This keeps the corresponding items rendered continuously without being removed due to being outside the rendering area. You can make them sticky by using CSS position:sticky.
- listSize: number, default: 1000. Height of the visible area of the list. Only used before DOM creation, suitable for SSR.
- triggerDistance: number. The min distance to trigger re-rendering when scrolling.
- onScroll: React.UIEventHandler. Listen for the list's scroll event. Type is same with HTML native onscroll handle.
- virtual: boolean. default: true. Whether to enable the virtual list feature. Render all items if disabled.
- renderHead: () => ReactNode. Customize the persistent rendering content of the list header. Suitable for absolutely positioned, fixed positioned elements, and elements that do not take up too much space.
- renderFoot: () => ReactNode. Customize the persistent rendering content of the list footer. Suitable for absolutely positioned, fixed positioned elements, and elements that do not take up too much space.
- className: string. Add a CSS class to the list root element.
- style: React.CSSProperties. Add CSS styles to the list root element.
- innerClassName: string. Add a CSS class to the list inner element.

Exposed Methods

First, use ref to obtain the exposed object.

`tsx
import { useRef } from "react";
import { VirtualList, VirtualListHandle } from "react-base-virtual-list";

export default function BaseExample() {
const ref = useRef(null);
return (
<>


);
}
`

Irrelevant parts are omitted in the above code. VirtualListHandle is a typescript type, please ignore it if you are using pure JS.

VirtualListHandle type code.

`ts
interface VirtualListHandle {
scrollToIndex(
index: number,
block?: "start" | "end" | "center" | "nearest"
): void;
getRootElement(): HTMLElement;
forceUpdate(): void;
}
`

Then use the ref object to access the exposed methods.

- scrollToIndex: (index:number, block = 'start'):void. Scroll to the specified index position. block is equal to the block option of the HTML native method scrollIntoView.
- getRootElement: Get list HTML element。
- forceUpdate: Forcefully re-render the list. This can be called after the visible area of the list changes.

Note

- Remember to set the height of the list. Class, style, px, em, percentage, etc. are all acceptable.
- Delayed loading, loading when scrolling to the bottom, etc. can be implemented using the exposed onScroll.

IIFE

The dist/index.iife.js file can be run in the browser.
You can host it on your server and then use the script tag to include it. Before including it, you also need to include react, react-dom. The global variable exposed by this file is reactBaseVirtualList, you can access all the exports of this file through window.reactBaseVirtualList, and get the main component exported through window.reactBaseVirtualList.VirtualList.

You can also use the following third-party CDN url to include it.

- unpkg: https://unpkg.com/react-base-virtual-list
- jsdelivr: https://cdn.jsdelivr.net/npm/react-base-virtual-list

Development

- lib: The main files, also the files that are packaged into the library. Running npm run build will package the files in this directory into the dist folder. The corresponding Vite configuration file is vite.build.ts.
- src: The files used for development and debugging. Running npm run dev will run the code in this directory in the browser. Running npm run build:web will package the code in this directory into the dist folder. The corresponding Vite configuration file is vite.config.ts.
- uno.config.ts: unocss configuration file. unocss only works in the src folder. With the current configuration, you can use Tailwindcss style class names.
- .github/workflows/build.yml`: Some automated actions performed when publishing to GitHub. You can delete or modify it.

Changelog

https://github.com/phphe/react-base-virtual-list/releases