react-collapse

Collapse component with CSS transition for elements with variable and dynamic height.

Demo

• simple - codepen
• accordion - codepen
• read more - codepen
• using npm - codesandbox
• view storybook

CSS required

⚠️ ️You need to specify the transition property or add a class selector with style (transition) in your own stylesheet to add animation. Here is an example.

.collapse-css-transition {
  transition: height 300ms cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

Installation for React 16.3+

(about 6kb)

npm i -S @kunukn/react-collapse@^1

or

yarn add @kunukn/react-collapse@^1

Installation for React 16.8+

(about 4kb)

npm i -S @kunukn/react-collapse

or

yarn add @kunukn/react-collapse

import Collapse from '@kunukn/react-collapse';
// or with require syntax
const Collapse = require('@kunukn/react-collapse');

<Collapse isOpen={true || false}>
  <div>Random content</div>
</Collapse>;

Properties

isOpen: PropTypes.boolean

Expands or collapses content.

children: PropTypes.node or render: PropTypes.func

One or multiple children with static, variable or dynamic height.

<Collapse isOpen={false || true}>
  <p>Paragraph of text</p>
  <p>Another paragraph is also OK</p>
  <p>Images and any other content are ok too</p>
  <img src="cutecat.gif" />
</Collapse>

or

<Collapse
  isOpen={ false || true }
  render={collapseState => (
    <div className="using-collapse-state-to-add-css-class " + collapseState>
      <p>I know the collapse state: {collapseState}</p>
      <p>Another paragraph is also OK</p>
      <p>Images and any other content are ok too</p>
      <img src="cutecat.gif" />
    </div>
  )}
/>

className: PropType.string

You can specify a className with your desired style and animation. By default collapse-css-transition will be added to the component.

transition: PropType.string

You can also specify a CSS transition in line by using the transition prop.

<Collapse transition="height 300ms cubic-bezier(.4, 0, .2, 1)">
  <p>Paragraph of text</p>
</Collapse>

elementType: PropType.string

You can specify the HTML element type for the collapse component. By default the element type is a div element.

<Collapse elementType="article">
  <p>Paragraph of text inside an article element</p>
</Collapse>

collapseHeight: PropType.string

You can specify the collapse height in CSS unit to partially show some content.

<Collapse collapseHeight="50px">
  <p>A long paragraph of text inside an article element</p>
</Collapse>

onChange = ({ collapseState, isMoving, hasReversed, collapseStyle }) => { /* your implementation */ }: PropTypes.func

Callback function for when your transition on height (specified in className) is started or finished. It can be used to trigger any function after transition is done.

onInit = ({ collapseState, collapseStyle }) => { /* your implementation */ }: PropTypes.func

Callback function for when the component has mounted.

ARIA and data attributes

Collapse transfers aria- and data- attributes to the component's rendered DOM element. For example this can be used to set the aria-hidden attribute:

<Collapse isOpen={isOpenState} aria-hidden={isOpenState ? 'false' : 'true'}>
  <p>Paragraph of text</p>
</Collapse>

Development and testing

To run development

npm start or yarn start

git clone [repo]
cd [repo]
npm i
npm start
open http://localhost:6007

or with yarn

git clone [repo]
cd [repo]
yarn
yarn start
open http://localhost:6007

To run example covering all features, use npm run storybook or yarn storybook.

CDN

https://unpkg.com/@kunukn/react-collapse/

<link rel="stylesheet" href="https://unpkg.com/@kunukn/react-collapse/dist/Collapse.css" />
<script src="https://unpkg.com/@kunukn/react-collapse/dist/Collapse.js"></script>

<script>
  var Collapse = window.Collapse;
</script>

Supported browsers

IE11 + Modern browsers

Supported React versions

• React version 16.3+ : use Collapse version 1
• React version 16.8+ : use Collapse version 2+

Used React 16.3 life-cycles

• render // uses the style states to invoke CSS transition
• componentDidMount // initial expanded or collapsed state
• getDerivedStateFromProps // detect if isOpen props has changed and apply a new collapse state
• componentDidUpdate // update style states from the four possible collapse states

Used React 16.8 life-cycles

• render
• useState
• useEffect

Design goals

• let the browser handle the animation using CSS transition
• minimalistic - only have a Collapse component which updates on isOpen props
• flexible - provide your own markup, styling and easing
• interruptible - can be reversed during movement
• simple api with onChange event hook
• inert - when collapsed you should tab over the collapsed component
• minimal in file size
• availability - from cdn or npm install

This was created with heavily inspiration from

https://github.com/SparebankenVest/react-css-collapse 🎆