Animation Back

React provides a ReactTransitionGroup add-on component as a low-level API for animation, and a ReactCSSTransitionGroup for easily implementing basic CSS animations and transitions.

High-level API: ReactCSSTransitionGroup

ReactCSSTransitionGroup is 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.

Getting Started

ReactCSSTransitionGroup is the interface to ReactTransitions. This is a simple element that wraps all of the components you are interested in animating. Here's an example where we fade list items in and out.

var ReactCSSTransitionGroup = require('react-addons-css-transition-group');

var TodoList = React.createClass({
    getInitialState: function () {
        return { items: ['hello', 'world', 'click', 'me'] };
    },

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

    handleRemove: function (i) {
        var newItems = this.state.items.slice();
        newItems = newItems.splice(i, 1);

        this.setState({ items: newItems });
    },

    render: function () {
        var items = this.state.items.map(function (item, i) {
            return (
                <div key={item} onClick={this.handleRemove.bind(this, 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.

Therefore, we can use these classes:

.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 may notice that animation durations need to be specified in both the CSS and the render. That's to tell React when to remove the animation classes from the element and when to remove element from the DOM.

Animate Initial Mounting

ReactCSSTranitionGroup has provided an optional prop transitionAppear, to add an extra transition phase at the intial mount of the component.

var MyComponent = React.createClass({
    render: function () {
        return (
            <ReactCSSTransitionGroup transtionName="example" transitionAppear={true} transitionAppearTimeout={500}>
                <h3>Fading at Inital Mount</h3>
            </ReactCSSTransitionGroup>
        );
    }
});

.example-appear {
    opacity: 0.01;
}

.example-appear.example-appear-active {
    opacity: 1;
    transition: opacity 0.5s 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.

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.

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

Disabling Animations

You can disable animating enter or leave animations if you want. Just add transitionEnter={false} or transitionLeave={false} props to ReactCSSTransitionGroup to disable these animations.

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