score:15

Accepted answer

React is just changing the content of the DOM because that's all that changed. Give the elements unique keys to make them animate.

  if (this.state.showOne)
  {
    result = <div key="one">One</div>
  }
  else 
  {
    result = <div key="two">Two</div>
  }

JSFiddle

score:1

I used Michelle Treys answer to solve a similar problem using React-Router (1.0.1). Its not clear from the api that the key is needed. I was following React-routers suggestion to render a routes children in a parent as follows:

render() {
    return (
        <div id='app-wrapper'>
          <ReactTransitionGroup component='div' className='transition-wrapper'>
            {this.props.children}
          </ReactTransitionGroup>
        </div>
    );
  }

However the componentWillEnter only triggered on page load. Following Michelle's solution, I cloned a the children as per the react-router updates and added a key as follows: 

render() {

    const { location } = this.props;

    return (
        <div id='app-wrapper'>
          <ReactTransitionGroup component='div' className='transition-wrapper'>
            {React.cloneElement(this.props.children, {
              key: location.pathname,
            })}
          </ReactTransitionGroup>
        </div>
    );
  }

Thanks for the fix. Cheers


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