react-transitioning

A simple React library that provides components for managing animations and transitions with ease. It allows seamless transitions for both individual components and groups of elements. The library is inspired by react-transition-group and shares a similar API with a few notable differences.

Key Features

• Ease of Use: Simple and intuitive API for creating animations and transitions for both components and groups of elements.
• Modern Approach: Built with functional components and hooks, avoiding deprecated methods like findDOMNode.
• No External Dependencies: No additional dependencies, keeping your project lightweight and reducing potential conflicts.
• No nodeRef Required: Unlike react-transition-group, there's no need to pass a nodeRef prop.
• Flexibility: Supports both CSS-based and inline style-based animations.
• Lightweight: Minimal bundle size to keep your application fast.

The library provides components that allow you to easily create custom components with animations and transitions tailored to your needs. You can integrate them into your own React components to add smooth animations and transitions with minimal effort.

<FadeTransition in={visible}>
  <div>Fading element</div>
</FadeTransition>

Installation

To install the library, run:

npm install react-transitioning
# or
yarn add react-transitioning

Documentation

For more detailed information and usage examples, check out the Docs.

Usage

Transition Component

The Transition component allows you to control the mounting and unmounting of an element with transitions.

import { Transition } from 'react-transitioning'

...

<Transition in={!hidden} appear exit={false}>
  {(transitionState) => (
    <pre>{JSON.stringify(transitionState)}</pre>
  )}
</Transition>

CSSTransition Component

The CSSTransition component applies CSS classes based on the current transition state.

import { CSSTransition } from 'react-transitioning'

...

<CSSTransition in={!hidden} classNames="fade">
  <div>Animated element</div>
</CSSTransition>

StyleTransition Component

The StyleTransition component applies inline styles based on the current transition state. This is useful for customizing transitions without needing to rely on external CSS.

import { StyleTransition } from 'react-transitioning'

...

<StyleTransition 
  in={!hidden} 
  duration={300} 
  styles={{
    enter: { opacity: 0 },
    enterActive: { opacity: 1 },
  }}
>
  <div style={{ transition: 'opacity 300ms' }}>Animated element</div>
</StyleTransition>

TransitionGroup Component

The TransitionGroup component handles a set of elements, animating them as they are added or removed from the DOM.

import { TransitionGroup } from 'react-transitioning'

...

<TransitionGroup duration={300}>
  {items.map((item) => (
    <CSSTransition key={item.key} classNames="fade">
      <div>{item.label}</div>
    </CSSTransition>
  ))}
</TransitionGroup>

Detecting Transition End:

<CSSTransition
  in={!hidden}
  classNames="fade"
  addEndListener={(phase, done) => {
    nodeRef.current.addEventListener('transitionend', done, { once: true, capture: false })
  }}
>
  <div ref={nodeRef}>Animated element</div>
</CSSTransition>

API

Transition Props

type TransitionProps = {
  children: React.ReactNode | ((transitionState: TransitionState, activePhase: TransitionPhase) => React.ReactNode);
  in?: boolean;
  appear?: boolean;
  enter?: boolean;
  exit?: boolean;
  duration?: number;
  alwaysMounted?: boolean;
  addEndListener?: (phase: TransitionPhase, done: () => void) => void;
  onEnter: () => void;
  onEntering: () => void;
  onEntered: () => void;
  onExit: () => void;
  onExiting: () => void;
  onExited: () => void;
}

The TransitionState passed to the children function has the following structure:

type TransitionState = {
  appear: boolean;
  appearActive: boolean;
  appearDone: boolean;
  enter: boolean;
  enterActive: boolean;
  enterDone: boolean;
  exit: boolean;
  exitActive: boolean;
  exitDone: boolean;
}

CSSTransition Props

type CSSTransitionProps = Omit<TransitionProps, 'children'> & {
  children: React.ReactElement<{ className?: string }>
  classNames: string | {
    appear?: string;
    appearActive?: string;
    appearDone?: string;
    enter?: string;
    enterActive?: string;
    enterDone?: string;
    exit?: string;
    exitActive?: string;
    exitDone?: string;
  }
}

if classNames is a string, then the computed className will be suffixed based on the current transition state. For example, when classNames is "fade", the fade-appear-active class will be applied during the appearActive phase.

If classNames is an object, the final className will be taken from that object based on the current transition state.

StyleTransition Props

type StyleTransitionProps = Omit<TransitionProps, 'children'> & {
  children: React.ReactElement<{ style?: React.CSSProperties };
  styles: {
    appear?: object;
    appearActive?: object;
    appearDone?: object;
    enter?: object;
    enterActive?: object;
    enterDone?: object;
    exit?: object;
    exitActive?: object;
    exitDone?: object;
  }
}

The styles prop allows you to define inline styles based on the current transition state. For example, when the element enters, the enterActive styles will be applied.

TransitionGroup Props

type TransitionGroupProps = {
  children: React.ReactNode;
  appear?: boolean;
  enter?: boolean;
  exit?: boolean;
  duration?: number;
}

License

MIT