Snippet will return a 1-based-index of an element in relation to like tags at same level.

indexOfType.js

// Return 1-based-index of an element in relation to like tags
function indexOfType(element) {
  var prev = element.prevAll(element[0].tagName);
	if ( empty(prev) ){
		return 1;	// For 1 indexing
	}
	else return 1 + prev.length;
}