Lightweight React component for animating height using CSS transitions

React Animate Height

Lightweight React component for animating height using CSS transitions. Slide up/down the element, and animate it to any specific height. Content's opacity can be optionally animated as well (check animateOpacity prop bellow).

CSS classes are applied in specific animation states, check animationStateClasses prop.

Note about versions
For React >=16.3.0 (17 included) make sure you are using v2.x.

Read more about React lifecycle changes introduced with React 16.3.

Demo

To build the examples locally, run:

npm install
npm start

Then open [`localhost:8080`](http://localhost:8080) in your browser of choice browser.

Quick start

Get it from npm

$ npm install --save react-animate-height

Import and use it in your React app.

import React, { Component } from 'react';
import AnimateHeight from 'react-animate-height';

export default class Example extends Component {
  state = {
    height: 0,
  };

  toggle = () => {
    const { height } = this.state;

    this.setState({
      height: height === 0 ? 'auto' : 0,
    });
  };

  render() {
    const { height } = this.state;

    return (
      <div>
        <button onClick={ this.toggle }>
          { height === 0 ? 'Open' : 'Close' }
        </button>

        <AnimateHeight
          duration={ 500 }
          height={ height } // see props documentation bellow
        >
          <h1>Your content goes here</h1>
          <p>Put as many React or HTML components here.</p>
        </AnimateHeight>
      </div>
    );
  }
}

Props

• height: numeric or percentage value (ie. '50%') or 'auto', required

  When changed, element height will be animated to that height.
  
  To slide up use 0, for slide down use 'auto'

• duration: integer, default: 250

  Duration of the animation in milliseconds

• delay: integer, default: 0

  Animation delay in milliseconds

• easing: string, default: 'ease'

  CSS easing function to be applied to the animation

• className: string

  CSS class to be applied to the element

  Please note that you shouldn't apply properties that are messing with the layout (like display, height...), as these might break height calculations

• style: object

  CSS style object, it will be merged with inline styles of the component

  Please note that you shouldn't apply properties that are messing with the layout (like display, height...), as these might break height calculations

• contentClassName: string

  CSS class to be applied to content wrapper element

  Please note that you shouldn't apply properties that are messing with the layout (like display, height...), as these might break height calculations

• animationStateClasses: object

  Object containing CSS class names for animation states, default:

  {
    animating:                  'rah-animating',
    animatingUp:                'rah-animating--up',
    animatingDown:              'rah-animating--down',
    static:                     'rah-static',
    animatingToHeightZero:      'rah-animating--to-height-zero',
    animatingToHeightAuto:      'rah-animating--to-height-auto',
    animatingToHeightSpecific:  'rah-animating--to-height-specific',
    staticHeightZero:           'rah-static--height-zero',
    staticHeightAuto:           'rah-static--height-auto',
    staticHeightSpecific:       'rah-static--height-specific',
  }
  

  Please note that this one will be merged with the default object and cached when component is created,
  so changing it afterwards will have no effect.

• onAnimationStart: function

  Callback which will be called when animation starts

• onAnimationEnd: function

  Callback which will be called when animation ends

• applyInlineTransitions: boolean, default: true

  If this flag is set to false only CSS classes will be applied to the element and inline
  transition styles will not be present.

• animateOpacity: boolean, default: false

  If set to true content will fade-in (and fade-out) while height is animated.

Additional props will be passed to the wrapper div, to make adding attrs like aria-* easier.

GitHub