material_base-8.x-2.x-dev/js/mb-slide.js

/*
Vanilla JS replacement of JQuery slideUp, slideDown, slideToggle.

Based on https://gist.github.com/AaronF/bb6170329698277c7585d5be4ecb2583
*/

const slideUp = (target, duration) => {
  target.style.transitionProperty = 'height, margin, padding';
  target.style.transitionDuration = duration + 'ms';
  target.style.boxSizing = 'border-box';
  target.style.height = target.offsetHeight + 'px';
  target.offsetHeight;
  target.style.overflow = 'hidden';
  target.style.height = 0;
  target.style.paddingTop = 0;
  target.style.paddingBottom = 0;
  target.style.marginTop = 0;
  target.style.marginBottom = 0;

  window.setTimeout(function () {
    target.style.display = 'none';
    target.style.removeProperty('height');
    target.style.removeProperty('padding-top');
    target.style.removeProperty('padding-bottom');
    target.style.removeProperty('margin-top');
    target.style.removeProperty('margin-bottom');
    target.style.removeProperty('overflow');
    target.style.removeProperty('transition-duration');
    target.style.removeProperty('transition-property');
  }, duration);
};

const slideDown = (target, duration) => {
  target.style.removeProperty('display');
  let display = window.getComputedStyle(target).display;

  if (display === 'none') {
    display = 'block';
  }

  target.style.display = display;
  let height = target.offsetHeight;
  target.style.overflow = 'hidden';
  target.style.height = 0;
  target.style.paddingTop = 0;
  target.style.paddingBottom = 0;
  target.style.marginTop = 0;
  target.style.marginBottom = 0;
  target.offsetHeight;
  target.style.boxSizing = 'border-box';
  target.style.transitionProperty = 'height, margin, padding';
  target.style.transitionDuration = duration + 'ms';
  target.style.height = height + 'px';
  target.style.removeProperty('padding-top');
  target.style.removeProperty('padding-bottom');
  target.style.removeProperty('margin-top');
  target.style.removeProperty('margin-bottom');

  window.setTimeout(function () {
    target.style.removeProperty('height');
    target.style.removeProperty('overflow');
    target.style.removeProperty('transition-duration');
    target.style.removeProperty('transition-property');
  }, duration);
};

// eslint-disable-next-line
const slideToggle = (target, duration) => {
  if (window.getComputedStyle(target).display === 'none') {
    return slideDown(target, duration);
  } else {
    return slideUp(target, duration);
  }
};