Trigger ReactCSSTransitionGroup on scroll

Question

I've been trying to figure out how to trigger the react css transition group on scroll. Say i've got a stack of components and this example gets rendered off screen :

// component.jsx

import React from 'react'
import ReactCSSTransitionGroup from 'react-addons-css-transition-group'
import './style.css'
export default class extends React.Component {
    constructor() {
    super()
    this.state = {
      title: ['an off screen title']}
    }
    render() {
    const displayText = this.state.title.map(i => <h1 key={i}>{i.title}</h1>)
      return (
        <ReactCSSTransitionGroup
            transitionName='atxt'
            transitionEnterTimeout={1000}
            transitionLeaveTimeout={1000}>
          {displayText}
        </ReactCSSTransitionGroup>
      )
    }
}

// style.css

.atxt-enter {
  opacity: 0.01;
}
.atxt-enter.atxt-enter-active {
  opacity: 1;
  transition: opacity 1000ms ease-in;
}
.atxt-leave {
  opacity: 1;
}
.atxt-leave.atxt-leave-active {
  opacity: 0.01;
  transition: opacity 1000ms ease-in;
}

I want the transition group to be triggered when it enters the View and not just when the component is initially rendered. I've been mulling over the docs and exploring pre-made libraries / components to accomplish this but have not found anything that doesn't involve bringing in huge animation libraries... I know deep in my cockles there is a way to do this, hence, asking the pros here. Cheers ya'll.

Answer 1

Just throwing out an idea:

Use https://github.com/brigade/react-waypoint to add your component to the DOM when you scroll to a specific element.

<Waypoint onEnter={this.handleWaypointEnter} onLeave={this.handleWaypointLeave}/>

In your handleWaypointEnter , add your <ReactCSSTransitionGroup>...</ReactCSSTransitionGroup> to the dom. This should work, according to the docs it applies animations upon entering the dom.