traverse dom upwards to find an element by it's data attribute

findParentAttribute.js

var findParentAttribute = function(id, ctx) {
  if (ctx.hasAttribute(id)) {
  	return ctx.getAttribute(id);
  } else {
  	return this.findParentAttribute(id, ctx.parentElement)
  }
  return false
}

findParentAttribute('foo', document.querySelector('div').parentElement) // will traverse dom to find parent element with data attribute