popperjs / Popper Core

Popper is now Floating UI! For Popper v2, visit its dedicated branch.

Website

Floating UI is a low-level library for positioning "floating" elements like tooltips, popovers, dropdowns, menus and more. Since these types of elements float on top of the UI without disrupting the flow of content, challenges arise when positioning them.

Floating UI exposes primitives which enable a floating element to be positioned next to a given reference element while appearing in view for the user as best as possible. Features include overflow prevention (or collision awareness), placement flipping, and more.

• Tiny: 600-byte core with highly modular architecture for tree-shaking
• Low-level: Hyper-granular control over positioning behavior
• Pure: Predictable, side-effect free behavior
• Extensible: Powerful middleware system
• Platform-agnostic: Runs on any JavaScript environment which provides measurement APIs, including the web and React Native

Installation

To use it on the web:

npm install @floating-ui/dom

yarn add @floating-ui/dom

Quick start

import {computePosition} from '@floating-ui/dom';

const referenceElement = document.querySelector('#button');
const floatingElement = document.querySelector('#tooltip');

function applyStyles({x = 0, y = 0, strategy = 'absolute'}) {
  Object.assign(floatingElement.style, {
    position: strategy,
    left: `${x}px`,
    top: `${y}px`,
  });
}

applyStyles();

computePosition(referenceElement, floatingElement, {
  placement: 'right',
}).then(applyStyles);

Visit the docs for detailed information.

React

• React DOM
• React Native (*experimental)

Components

Right now, Floating UI focuses on positioning floating elements, but a package that exposes higher-level primitives for building these elements more easily is in development.

Contributing

This project is a monorepo written in TypeScript using npm workspaces. The website is using Next.js SSG and Tailwind CSS for styling.

• Clone the repo
• Install dependencies in root directory with npm install
• npm run dev in the root will launch the @floating-ui/dom development visual tests at http://localhost:1234/spec. You can fiddle around with each test file in packages/dom/test/visual/spec/. Reload the page to see your changes.

License

MIT