javascript + e4x: how to test if an element is empty?

Question

Is there a way to test whether an XML element is empty using e4x?

e.g. if I have an element <foo />, I want to return true, but if I have another element that has any attributes, child elements, or text, I want to return false.

Answer 1

I just slogged through the ECMA-357 v2 spec on e4x; the methods for XML nodes are listed in section 13.4.4, and there are no useful isXXX() or hasXXX() methods for this test; the simplest way to do it seems to be the following:

function isEmptyNode(node){ 
  return node.children().length() == 0 && node.attributes().length() == 0;
}