drag.js

window.ondragover = function(e) { e.preventDefault(); return false;  };
  window.ondrop = function(e) { e.preventDefault(); return false; };
  
  var holder = window.document.getElementById('currentDirectory');
  holder.ondragover = function () { return false; };
  holder.ondragleave = function () { return false; };
  
  holder.ondrop = function(e){
    e.preventDefault();
    e.stopPropagation();
    console.log(e);
    return false;
  };