CollapsibleLists.js

//code.iamkate.com
var CollapsibleLists=function(){
  function e(b,c){
    [].forEach.call(b.getElementsByTagName("li"),function(a){c&&b!==a.parentNode||(a.style.userSelect="none",a.style.MozUserSelect="none",a.style.msUserSelect="none",a.style.WebkitUserSelect="none",a.addEventListener("click",g.bind(null,a)),f(a))})
  }
  function g(b,c){
    for(var a=c.target;"LI"!==a.nodeName;)a=a.parentNode;a===b&&f(b)
                 }
  function f(b){
    var c=b.classList.contains("collapsibleListClosed"),
      a=b.getElementsByTagName("ul");
                [].forEach.call(a,function(a){for(var d=a;"LI"!==d.nodeName;)d=d.parentNode;d===b&&(a.style.display=c?"block":"none")});
                b.classList.remove("collapsibleListOpen");
                b.classList.remove("collapsibleListClosed");
                0<a.length&&b.classList.add("collapsibleList"+(c?"Open":"Closed"))}
  return{
    apply:function(b){[].forEach.call(document.getElementsByTagName("ul"),function(c){c.classList.contains("collapsibleList")&&(e(c,!0),b||[].forEach.call(c.getElementsByTagName("ul"),function(a){a.classList.add("collapsibleList")}))})},applyTo:e
  }
}();