Testing objects for ancestor/descendent relationship in JavaScript or Jquery

Question

I\'m trying to come up with a reusable JS or jQuery function that would allow me to test if one object is a DOM descendant of another.

I\'ve seen a model of testing

Answer 1

In jQuery ancestors using jQuery objects I suggested

if ($(obj1).parents().index($(obj2)) >= 0) {
    // obj1 is a descendant of obj2
}