react.dev/content/docs/addons-animation.md

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Note:

ReactTransitionGroup and ReactCSSTransitionGroup have been moved to the react-transition-group package that is maintained by the community. Its 1.x branch is completely API-compatible with the existing addons. Please file bugs and feature requests in the new repository.

The ReactTransitionGroup add-on component is a low-level API for animation, and ReactCSSTransitionGroup is an add-on component for easily implementing basic CSS animations and transitions.

High-level API: ReactCSSTransitionGroup

ReactCSSTransitionGroup is a high-level API based on ReactTransitionGroup and is an easy way to perform CSS transitions and animations when a React component enters or leaves the DOM. It's inspired by the excellent ng-animate library.

Importing

import ReactCSSTransitionGroup from 'react-transition-group'; // ES6
var ReactCSSTransitionGroup = require('react-transition-group'); // ES5 with npm

class TodoList extends React.Component {
  constructor(props) {
    super(props);
    this.state = {items: ['hello', 'world', 'click', 'me']};
    this.handleAdd = this.handleAdd.bind(this);
  }

  handleAdd() {
    const newItems = this.state.items.concat([
      prompt('Enter some text')
    ]);
    this.setState({items: newItems});
  }

  handleRemove(i) {
    let newItems = this.state.items.slice();
    newItems.splice(i, 1);
    this.setState({items: newItems});
  }

  render() {
    const items = this.state.items.map((item, i) => (
      <div key={i} onClick={() => this.handleRemove(i)}>
        {item}
      </div>
    ));

    return (
      <div>
        <button onClick={this.handleAdd}>Add Item</button>
        <ReactCSSTransitionGroup
          transitionName="example"
          transitionEnterTimeout={500}
          transitionLeaveTimeout={300}>
          {items}
        </ReactCSSTransitionGroup>
      </div>
    );
  }
}

Note:

You must provide the key attribute for all children of ReactCSSTransitionGroup, even when only rendering a single item. This is how React will determine which children have entered, left, or stayed.

In this component, when a new item is added to ReactCSSTransitionGroup it will get the example-enter CSS class and the example-enter-active CSS class added in the next tick. This is a convention based on the transitionName prop.

You can use these classes to trigger a CSS animation or transition. For example, try adding this CSS and adding a new list item:

.example-enter {
  opacity: 0.01;
}

.example-enter.example-enter-active {
  opacity: 1;
  transition: opacity 500ms ease-in;
}

.example-leave {
  opacity: 1;
}

.example-leave.example-leave-active {
  opacity: 0.01;
  transition: opacity 300ms ease-in;
}

You'll notice that animation durations need to be specified in both the CSS and the render method; this tells React when to remove the animation classes from the element and -- if it's leaving -- when to remove the element from the DOM.

Animate Initial Mounting

ReactCSSTransitionGroup provides the optional prop transitionAppear, to add an extra transition phase at the initial mount of the component. There is generally no transition phase at the initial mount as the default value of transitionAppear is false. The following is an example which passes the prop transitionAppear with the value true.

render() {
  return (
    <ReactCSSTransitionGroup
      transitionName="example"
      transitionAppear={true}
      transitionAppearTimeout={500}
      transitionEnter={false}
      transitionLeave={false}>
      <h1>Fading at Initial Mount</h1>
    </ReactCSSTransitionGroup>
  );
}

During the initial mount ReactCSSTransitionGroup will get the example-appear CSS class and the example-appear-active CSS class added in the next tick.

.example-appear {
  opacity: 0.01;
}

.example-appear.example-appear-active {
  opacity: 1;
  transition: opacity .5s ease-in;
}

At the initial mount, all children of the ReactCSSTransitionGroup will appear but not enter. However, all children later added to an existing ReactCSSTransitionGroup will enter but not appear.

Note:

The prop transitionAppear was added to ReactCSSTransitionGroup in version 0.13. To maintain backwards compatibility, the default value is set to false.

However, the default values of transitionEnter and transitionLeave are true so you must specify transitionEnterTimeout and transitionLeaveTimeout by default. If you don't need either enter or leave animations, pass transitionEnter={false} or transitionLeave={false}.

Custom Classes

It is also possible to use custom class names for each of the steps in your transitions. Instead of passing a string into transitionName you can pass an object containing either the enter and leave class names, or an object containing the enter, enter-active, leave-active, and leave class names. If only the enter and leave classes are provided, the enter-active and leave-active classes will be determined by appending '-active' to the end of the class name. Here are two examples using custom classes:

// ...
<ReactCSSTransitionGroup
  transitionName={ {
    enter: 'enter',
    enterActive: 'enterActive',
    leave: 'leave',
    leaveActive: 'leaveActive',
    appear: 'appear',
    appearActive: 'appearActive'
  } }>
  {item}
</ReactCSSTransitionGroup>

<ReactCSSTransitionGroup
  transitionName={ {
    enter: 'enter',
    leave: 'leave',
    appear: 'appear'
  } }>
  {item2}
</ReactCSSTransitionGroup>
// ...

Animation Group Must Be Mounted To Work

In order for it to apply transitions to its children, the ReactCSSTransitionGroup must already be mounted in the DOM or the prop transitionAppear must be set to true.

The example below would not work, because the ReactCSSTransitionGroup is being mounted along with the new item, instead of the new item being mounted within it. Compare this to the Getting Started section above to see the difference.

render() {
  const items = this.state.items.map((item, i) => (
    <div key={item} onClick={() => this.handleRemove(i)}>
      <ReactCSSTransitionGroup transitionName="example">
        {item}
      </ReactCSSTransitionGroup>
    </div>
  ));

  return (
    <div>
      <button onClick={this.handleAdd}>Add Item</button>
      {items}
    </div>
  );
}

Animating One or Zero Items

In the example above, we rendered a list of items into ReactCSSTransitionGroup. However, the children of ReactCSSTransitionGroup can also be one or zero items. This makes it possible to animate a single element entering or leaving. Similarly, you can animate a new element replacing the current element. For example, we can implement a simple image carousel like this:

import ReactCSSTransitionGroup from 'react-transition-group';

function ImageCarousel(props) {
  return (
    <div>
      <ReactCSSTransitionGroup
        transitionName="carousel"
        transitionEnterTimeout={300}
        transitionLeaveTimeout={300}>
        <img src={props.imageSrc} key={props.imageSrc} />
      </ReactCSSTransitionGroup>
    </div>
  );
}

Disabling Animations

You can disable animating enter or leave animations if you want. For example, sometimes you may want an enter animation and no leave animation, but ReactCSSTransitionGroup waits for an animation to complete before removing your DOM node. You can add transitionEnter={false} or transitionLeave={false} props to ReactCSSTransitionGroup to disable these animations.

Note:

When using ReactCSSTransitionGroup, there's no way for your components to be notified when a transition has ended or to perform any more complex logic around animation. If you want more fine-grained control, you can use the lower-level ReactTransitionGroup API which provides the hooks you need to do custom transitions.

---

Low-level API: ReactTransitionGroup

Importing

import ReactTransitionGroup from 'react-addons-transition-group' // ES6
var ReactTransitionGroup = require('react-addons-transition-group') // ES5 with npm

ReactTransitionGroup is the basis for animations. When children are declaratively added or removed from it (as in the example above), special lifecycle methods are called on them.

• componentWillAppear()
• componentDidAppear()
• componentWillEnter()
• componentDidEnter()
• componentWillLeave()
• componentDidLeave()

Rendering a Different Component

ReactTransitionGroup renders as a span by default. You can change this behavior by providing a component prop. For example, here's how you would render a <ul>:

<ReactTransitionGroup component="ul">
  {/* ... */}
</ReactTransitionGroup>

Any additional, user-defined, properties will become properties of the rendered component. For example, here's how you would render a <ul> with CSS class:

<ReactTransitionGroup component="ul" className="animated-list">
  {/* ... */}
</ReactTransitionGroup>

Every DOM component that React can render is available for use. However, component does not need to be a DOM component. It can be any React component you want; even ones you've written yourself! Just write component={List} and your component will receive this.props.children.

Rendering a Single Child

People often use ReactTransitionGroup to animate mounting and unmounting of a single child such as a collapsible panel. Normally ReactTransitionGroup wraps all its children in a span (or a custom component as described above). This is because any React component has to return a single root element, and ReactTransitionGroup is no exception to this rule.

However if you only need to render a single child inside ReactTransitionGroup, you can completely avoid wrapping it in a <span> or any other DOM component. To do this, create a custom component that renders the first child passed to it directly:

function FirstChild(props) {
  const childrenArray = React.Children.toArray(props.children);
  return childrenArray[0] || null;
}

Now you can specify FirstChild as the component prop in <ReactTransitionGroup> props and avoid any wrappers in the result DOM:

<ReactTransitionGroup component={FirstChild}>
  {someCondition ? <MyComponent /> : null}
</ReactTransitionGroup>

This only works when you are animating a single child in and out, such as a collapsible panel. This approach wouldn't work when animating multiple children or replacing the single child with another child, such as an image carousel. For an image carousel, while the current image is animating out, another image will animate in, so <ReactTransitionGroup> needs to give them a common DOM parent. You can't avoid the wrapper for multiple children, but you can customize the wrapper with the component prop as described above.

---

Reference

componentWillAppear()

componentWillAppear(callback)

This is called at the same time as componentDidMount() for components that are initially mounted in a TransitionGroup. It will block other animations from occurring until callback is called. It is only called on the initial render of a TransitionGroup.

---

componentDidAppear()

componentDidAppear()

This is called after the callback function that was passed to componentWillAppear is called.

---

componentWillEnter()

componentWillEnter(callback)

This is called at the same time as componentDidMount() for components added to an existing TransitionGroup. It will block other animations from occurring until callback is called. It will not be called on the initial render of a TransitionGroup.

---

componentDidEnter()

componentDidEnter()

This is called after the callback function that was passed to componentWillEnter() is called.

---

componentWillLeave()

componentWillLeave(callback)

This is called when the child has been removed from the ReactTransitionGroup. Though the child has been removed, ReactTransitionGroup will keep it in the DOM until callback is called.

---

componentDidLeave()

componentDidLeave()

This is called when the willLeave callback is called (at the same time as componentWillUnmount()).