onClickHandler() proposal

gistfile1.js

  function onClickHandler(evt) {
    var target = evt.target;
    var dataset = target.dataset || {};
    var parentDataset = target.parentNode ?
                          (target.parentNode.dataset || {}) : {};
    var uuid = dataset.uuid;
    var node = target;
    if (!uuid) {
      uuid = parentDataset.uuid;
      node = target.parentNode;
    }
    if (uuid) {
      callbacks.forEach(function(callback) {
        callback(uuid, node);
      });
    }
    evt.preventDefault();
  }