Darling Duffy

read-more.js

document.addEventListener('DOMContentLoaded', function(){
  function fadeIn(el) {
    el.style.opacity = 0;

    var last = +new Date();
    var tick = function() {
      el.style.opacity = +el.style.opacity + (new Date() - last) / 400;
      last = +new Date();

      if (+el.style.opacity < 1) {
        (window.requestAnimationFrame && requestAnimationFrame(tick)) || setTimeout(tick, 16)
      }
    };

    tick();
  }

  function HideNextSiblings(el) {
    if (el.nextElementSibling) {
      el.nextElementSibling.style.display = 'none';
      HideNextSiblings(el.nextElementSibling);
    }
  }

  function ShowNextSiblings(el) {
    if (el.nextElementSibling) {
      el.nextElementSibling.style.display = '';
      fadeIn(el.nextElementSibling);
      ShowNextSiblings(el.nextElementSibling);
    }
  }

  var read_more = document.querySelector('.read-more-bio');

  if (read_more) {

    HideNextSiblings(read_more.parentElement);
    read_more.addEventListener('click', function(event) {
        this.style.display = 'none';
        ShowNextSiblings(this.parentElement);
        event.preventDefault();
    });
  }
});