@kunukn/react-collapse

react-collapse

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

react-collapse

Demo

• simple - codepen

• accordion - codepen

• read more - codepen

• simple - edit stackblitz

• codesandbox - collapsibles

• codesandbox expand-all

• codesandbox CSS-in-JS integration example

• view storybook

CSS required

⚠️ ️You need to add style (transition) in your own stylesheet to add animation. Here is an example.

<style>
  .collapse-css-transition {
    transition: height 280ms cubic-bezier(0.4, 0, 0.2, 1);
  }
</style>

Alternatively, you can add it using the transition prop.

Installation for React 16.8+

• UMD minified ~2.3 kb, gzipped ~1.1 kb
• Module minified ~2.9 kb, gzipped ~1.1 kb
• CJS minified ~2.0 kb, gzipped ~1.0 kb

npm i -D @kunukn/react-collapse
# or
# yarn add -D @kunukn/react-collapse

Installation for React 16.3+

Avoid it if possible. This is no longer maintained.

• UMD minified ~5.8 kb, gzipped ~2.1 kb

npm i -D @kunukn/react-collapse@^1
# or
# yarn add -D @kunukn/react-collapse@^1

Minimal toggle content component example.

// Notice how you import it, changed since ver 3.
import { Collapse } from '@kunukn/react-collapse'
import React from 'react'

export default function MyComponent() {
  const [isOpen, setIsOpen] = React.useState(false)
  const onToggle = () => setIsOpen((s) => !s)

  return (
    <div className="my-component">
      <button onClick={onToggle}> Toggle </button>
      <Collapse
        isOpen={isOpen}
        transition="height 300ms cubic-bezier(0.4, 0, 0.2, 1)"
      >
        <p> Hello world </p>
      </Collapse>
    </div>
  )
}

// The possible imports

import { Collapse } from '@kunukn/react-collapse' // UMD
import '@kunukn/react-collapse/dist/react-collapse.css' // CSS
import type { CollapseProps } from '@kunukn/react-collapse/dist/react-collapse.d.ts' // TS
const { Collapse } = require('@kunukn/react-collapse/dist/react-collapse.cjs') // CommonJS

Properties

Prop	Type	Default
isOpen	boolean	false
children	node | function
render	function
className	string	collapse-css-transition
transition	string
elementType	string	div
collapseHeight	string	0px
onChange	function
onInit	function
addState	boolean	false
noAnim	boolean	false
overflowOnExpanded	boolean	false

isOpen : boolean

Expands or collapses content.

children : node | function

Render the children.

const MyComponent = ({ isOpen }) => (
  <Collapse isOpen={isOpen}>
    <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>
)

Render content using the render-props pattern.

const MyComponent = ({ isOpen }) => (
  <Collapse isOpen={isOpen}>
    {(state) => (
      <div className={`using-collapse-state-to-add-css-class ${state}`}>
        <p>I know the collapse state: {state}</p>
      </div>
    )}
  </Collapse>
)

render : function

Render content using the render-props pattern.

const MyComponent = ({ isOpen }) => {
  const render = (state) => (
    <div className={`using-collapse-state-to-add-css-class ${state}`}>
      <p>I know the collapse state: {state}</p>
    </div>
  )
  return <Collapse isOpen={isOpen} render={render} />
}

There are four possible collapse states: collapsed, collapsing, expanded, expanding.

className : string

You can specify a custom className. The default value is collapse-css-transition. Remember to add CSS transition if a className is provided.

transition : string

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

const MyComponent = ({ isOpen, duration = '290ms' }) => (
  <Collapse
    transition={`height ${duration} cubic-bezier(.4, 0, .2, 1)`}
    isOpen={isOpen}
  >
    <p>Paragraph of text</p>
  </Collapse>
)

elementType : string

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

const MyComponent = ({ isOpen }) => (
  <Collapse elementType="article" isOpen={isOpen}>
    <p>Paragraph of text inside an article element</p>
  </Collapse>
)

collapseHeight : string

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

const MyComponent = ({ isOpen }) => (
  <Collapse collapseHeight="40px" isOpen={isOpen}>
    <p>A long paragraph of text inside an article element</p>
  </Collapse>
)

onChange : function

Callback function for when the transition changes.

const MyComponent = ({ isOpen }) => {
  const onChange = ({ state, style }) => {
    /*
    state: string = the state of the collapse component.
    style: object = styles that are applied to the component.
  */
  }

  return (
    <Collapse onChange={onChange} isOpen={isOpen}>
      <p>A long paragraph of text inside an article element</p>
    </Collapse>
  )
}

onInit : function

Similar to onChange but only invoked on DOM mounted.
This is an example that starts collapsed and expands on mount.

const MyComponent = () => {
  const [isOpen, setIsOpen] = React.useState(false)

  const onInit = ({ state, style, node }) => {
    /*
       node: HTMLElement = the DOM node of the component.
    */

    setIsOpen(true)
  }

  return (
    <div>
      <button onClick={() => setIsOpen((state) => !state)}> Toggle </button>
      <Collapse onInit={onInit} isOpen={isOpen}>
        <p>A long paragraph of text inside an article element</p>
      </Collapse>
    </div>
  )
}

addState : boolean

If added, then one of the class names will be appended to the component depending on the state.

--c-collapsed
--c-collapsing
--c-expanded
--c-expanding

noAnim : boolean

If added, then there will be no collapse animation. State changes between collapsed and expanded.

overflowOnExpanded : boolean

If added, then overflow: hidden style will not be added when the state is expanded.

Custom props

Collapse applies custom props such as aria- and data- attributes to the component's rendered DOM element. For example, this can be used to set the aria-hidden attribute:

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

Or you could specify a specific transitionDuration.

const collapseStyles = { transitionDuration: '270ms' }

const MyComponent = ({ isOpen }) => (
  <Collapse style={collapseStyles} isOpen={isOpen}>
    <p>Paragraph of text</p>
  </Collapse>
)

Development

To run development

npm start

git clone [repo]
cd [repo]
npm i
npm start

• To develop and play around: npm start
• To build the bundle: npm run build

CDN

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

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

NPM

https://www.npmjs.com/package/@kunukn/react-collapse

Supported browsers

Modern browsers (Edge, Firefox, Chrome, Safari, etc).

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 have changed and apply a new collapse state)
• componentDidUpdate (update style states from the four possible collapse states)

Used React 16.8+ hooks

• useState
• useEffect
• useRef
• useCallback
• useReducer

Design goals

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

This was created with heavy inspiration from

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

A version also exists for Vue

https://github.com/kunukn/vue-height-collapsible