react-flip-move

React Flip Move

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This module was built to tackle the common but arduous problem of animating a list of items when the list’s order changes.

CSS transitions only work for CSS properties. If your list is shuffled, the items have rearranged themselves, but without the use of CSS. The DOM nodes don’t know that their on-screen location has changed; they’ve just been removed and inserted elsewhere in the document.

Flip Move uses the FLIP technique to work out what such a transition would look like, and fakes it using 60+ FPS hardware-accelerated CSS transforms.

demo

Demos

Installation

yarn add react-flip-move

# Or, if not using yarn:
npm i -S react-flip-move

UMD builds are also available via CDN:

Features

Flip Move was inspired by Ryan Florence’s awesome Magic Move, and offers:

Quickstart

The implementation couldn’t be simpler. Just wrap the items you’d like to move in a FlipMove, with any custom options:

import FlipMove from 'react-flip-move';

const TopArticles = ({ articles }) => (
  <FlipMove duration={750} easing="ease-out">
    {articles.map(article => (
      <Article key={article.id} {...article} />
    ))}
  </FlipMove>
);

API Reference

View the full API reference documentation

Enter/Leave Animations

View the enter/leave docs

Compatibility

  Chrome Firefox Safari IE Edge iOS Safari/Chrome Android Chrome
Supported ✔ 10+ ✔ 4+ ✔ 6.1+ ✔ 10+ ✔ ✔ 6.1+ ✔

How It Works

Curious how this works, under the hood? Read the Medium post.

Wrapping Element

By default, FlipMove wraps the children you pass it in a <div>:

// JSX
<FlipMove>
  <div key="a">Hello</div>
  <div key="b">World</div>
</FlipMove>

// HTML
<div>
  <div>Hello</div>
  <div>World</div>
</div>

Any unrecognized props to <FlipMove> will be delegated to this wrapper element:

// JSX
<FlipMove className="flip-wrapper" style=>
  <div key="a">Hello</div>
  <div key="b">World</div>
</FlipMove>

// HTML
<div class="flip-wrapper" style="color: red;">
  <div key="a">Hello</div>
  <div key="b">World</div>
</div>

You can supply a different element type with the typeName prop:

// JSX
<FlipMove typeName="ul">
  <li key="a">Hello</li>
  <li key="b">World</li>
</FlipMove>

// HTML
<ul style="color: red;">
  <li key="a">Hello</li>
  <li key="b">World</li>
</ul>

Finally, if you’re using React 16 or higher, and Flip Move 2.10 or higher, you can use the new “wrapperless” mode. This takes advantage of a React Fiber feature, which allows us to omit this wrapping element:

// JSX
<div className="your-own-element">
  <FlipMove typeName={null}>
    <div key="a">Hello</div>
    <div key="b">World</div>
  </FlipMove>
</div>

// HTML
<div class="your-own-element">
  <div key="a">Hello</div>
  <div key="b">World</div>
</div>

Wrapperless mode is nice, because it makes FlipMove more “invisible”, and makes it easier to integrate with parent-child CSS properties like flexbox. However, there are some things to note:

// BAD - this will cause children to jump to a new position before exiting:
<div style=>
  <FlipMove typeName={null}>
    <div key="a">Hello world</div>
  </FlipMove>
</div>

// GOOD - a non-static position and a tight-fitting wrapper means children will
// stay in place while exiting:
<div style=>
  <FlipMove typeName={null}>
    <div key="a">Hello world</div>
  </FlipMove>
</div>

Gotchas

Known Issues

Note on will-change

To fully benefit from hardware acceleration, each item being translated should have its own compositing layer. This can be accomplished with the CSS will-change property.

Applying will-change too willy-nilly, though, can have an adverse effect on mobile browsers, so I have opted to not use it at all.

In my personal experimentations on modern versions of Chrome, Safari, Firefox and IE, this property offers little to no gain (in Chrome’s timeline I saw a savings of ~0.5ms on a 24-item shuffle).

YMMV: Feel free to experiment with the property in your CSS. Flip Move will respect the wishes of your stylesheet :)

Further reading: CSS will-change Property

Contributions

Contributors welcome! Please discuss new features with me ahead of time, and submit PRs for bug fixes with tests (Testing stack is Mocha/Chai/Sinon, tested in-browser by Karma).

There is a shared prepush hook which launches eslint, flow checks, and tests. It sets itself up automatically during npm install.

Development

This project uses React Storybook in development. The developer experience is absolutely lovely, and it makes testing new features like enter/leave presets super straightforward.

After installing dependencies, launch the Storybook dev server with npm run storybook.

This project adheres to the formatting established by airbnb’s style guide. When contributing, you can make use of the autoformatter prettier to apply these rules by running the eslint script npm run lint:fix. If there are conflicts, the linter triggered by the prepush hook will inform you of those as well. To check your code by hand, run npm run lint.

Flow support

Flip Move’s sources are type-checked with Flow. If your project uses it too, you may want to install typings for our public API from flow-typed repo.

npm install --global flow-typed # if not already
flow-typed install react-flip-move@<version>

If you’re getting some flow errors coming from node_modules/react-flip-move/src path, you should add this to your .flowconfig file:

[ignore]
.*/node_modules/react-flip-move/.*

License

MIT

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