React Virtuoso - the most complete React virtualization rendering list/table/grid family of components.

• Variable sized items out of the box; no manual measurements or hard-coding item heights is necessary;
• Chat message list UI NEW;
• Grouped mode with sticky headers;
• Responsive grid layout;
• Table Support;
• Automatic handling of content resize;
• Custom Header, Footer, and empty list components;
• Pinned top items;
• Endless scrolling, press to load more;
• Initial top most item index;
• Scroll to index method.

For live examples and documentation, check the documentation website.

If you are using Virtuoso for work, sponsor it. Any donation helps a lot with the project development and maintenance.

npm install react-virtuoso

import * as React from 'react'
import * as ReactDOM from 'react-dom'
import { Virtuoso } from 'react-virtuoso'

const App = () => {
  return <Virtuoso style={{ height: '400px' }} totalCount={200} itemContent={index => <div>Item {index}</div>} />
}

ReactDOM.render(<App />, document.getElementById('root'))

The Virtuoso message list component is built specifically for human/chatbot conversations. In addition to the virtualized rendering, the component exposes an imperative data management API that gives you the necessary control over the scroll position when older messages are loaded, new messages arrive, and when the user submits a message. The scroll position can update instantly or with a smooth scroll animation.

The GroupedVirtuoso component is a variant of the "flat" Virtuoso, with the following differences:

• Instead of totalCount, the component exposes groupCounts: number[] property, which specifies the amount of items in each group. For example, passing [20, 30] will render two groups with 20 and 30 items each;
• In addition the itemContent property, the component requires an additional groupContent property, which renders the group header. The groupContent callback receives the zero-based group index as a parameter.

The VirtuosoGrid component displays same sized items in multiple columns. The layout and item sizing is controlled through CSS class properties, which allows you to use media queries, min-width, percentage, etc.

The TableVirtuoso component works just like Virtuoso, but with HTML tables. It supports window scrolling, sticky headers, sticky columns, and works with React Table and MUI Table.

You can customize the markup up to your requirements - check the Material UI list demo. If you need to support reordering, check the React Sortable HOC example.

For in-depth documentation and live examples of the supported features and live demos, check the documentation website.

To support legacy browsers, you might have to load a ResizeObserver Polyfill before using react-virtuoso:

import ResizeObserver from 'resize-observer-polyfill'
if (!window.ResizeObserver)
  window.ResizeObserver = ResizeObserver

Petyo Ivanov @petyosi.

To run the tests, use npm run test. An end-to-end browser-based test suite is runnable with npm run e2e, with the pages being e2e/*.tsx and the tests e2e/*.test.ts.

A convenient way to debug something is to preview the test cases in the browser. To do that, run npm run dev - it will launch a Ladle server that lets you browse the components in the examples folder.

MIT License.