varia-library-website/library/static/js/script.js

// Cloud section ===================== old school code divider =================
function rn(from, to) {
  return ~~(Math.random() * (to - from + 1)) + from;
}

function rs() {
  return arguments[rn(1, arguments.length) - 1];
}

function boxShadows(max) {
  let ret = [];
  for (let i = 0; i < max; ++i) {
    ret.push(`
      ${ rn(1, 100) }vw ${ rn(1, 100) }vh ${ rn(20, 40) }vmin ${ rn(1, 20) }vmin
      ${ rs('#F52D75', '#CCBD4F', '#32497F', '#EB4377') }
    `)
  }
  return ret.join(',');
}

const cloud = document.querySelector('#cloud');
function update() {
  cloud.style.boxShadow = boxShadows(120);
}
// Filter section ===================== old school code divider ================

filterSelection("all")
function filterSelection(c) {
  var x, i;
  allpublications = document.getElementsByClassName("filter");
  if (c == "all") {
    for (i = 0; i < allpublications.length; i++) {
      addClass(allpublications[i], "show");
    }
  }
  else {
    for (i = 0; i < allpublications.length; i++) {
      removeClass(allpublications[i], "show");
      if (allpublications[i].className.indexOf(c) > -1) {
        addClass(allpublications[i], "show");
      }
    }
  }
}

function addClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    if (arr1.indexOf(arr2[i]) == -1) {element.className += " " + arr2[i];}
  }
}

function removeClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    while (arr1.indexOf(arr2[i]) > -1) {
      arr1.splice(arr1.indexOf(arr2[i]), 1);
    }
  }
  element.className = arr1.join(" ");
}
window.addEventListener('load', update);