Adding ClassNames To Odd And Even Elements In ReactJs

I am trying to add the className 'direction-r' to the divs in the 'timeline' list that are even and className 'direction-l' to every other item (odd). I know how it can be achieved

Solution 1:

Instead of modifying the DOM, React allows you to define rendering logic inside the render method before the DOM is created:

var listItems
for( var i=0; i<4; i++) {
  listItems.push(
      <li key={i}>
        <div className={'direction-'+(i%2 ? 'r':'l')}>
          <div className="title-wrapper">
            <span className="title professional">
              Declared bankrupcy
            </span>
            <span className="time-wrapper"><span class="time">2015 - present</span></span>
          </div>
          <div className="detail">
            <p className="place">Corporation</p>
          </div>
        </div>
      </li>
  )
}

return (
  <div className="timeline-container">
    <h3>Timeline</h3>
    <ul className="timeline">
      {listItems}
    </ul>
  </div>
)

Solution 2:

This should work.

    class MainTimeline extends React.Component {

        render() {
            var isEven = (your even odd logic);
            var directionClass = isEven ? 'direction-r' : 'direction-l';
            return (
                <div className="timeline-container">
                    <h3>Timeline</h3>
                    <ul className="timeline">
                        <li>
                            <div className={directionClass}>
                                <div className="title-wrapper">
                                    <span className="title professional">
                                        Declared bankrupcy
                                    </span>
                                    <span className="time-wrapper"><span class="time">2015 - present</span></span>
                                </div>
                                <div className="detail">
                                    <p className="place">Corporation</p>
                                </div>
                            </div>
                        </li>
                    </ul>
                </div>
            );
        }

    }