reverseList.md

Displaying Items in Reverse Order

Sometimes it is desirable to dislpay a list in reverse order. The simplest way to do this is to add items to the front of the list (unshift) instead of the end (push). Here is a high level template for doing this:

export default class Example extends Component {
  constructor (props) {
    super(props)

    this.state = {
      list: []
    }
  }

  componentDidMount () {
    this._interval = setInterval(::this._updateFeed, 500)
  }

  componentWillUnmount () {
    clearInterval(this._interval)
  }

  render () {
    const { list } = this.state

    return (
      <div className={styles.VirtualScrollExample}>
        <VirtualScroll
          ref='VirtualScroll'
          className={styles.VirtualScroll}
          width={300}
          height={200}
          rowHeight={60}
          rowCount={list.length}
          rowRenderer={::this._rowRenderer}
        />
      </div>
    )
  }

  _updateFeed () {
    const list = [ ...this.state.list ]

    list.unshift(
      // Add new item here
    )

    this.setState({ list })

    // If you want to scroll to the top you can do it like this
    this.refs.VirtualScroll.scrollToRow(0)
  }

  _rowRenderer ({ index, isScrolling }) {
    return (
      // Your markup goes here
    )
  }
}

You can see a demo of this here.