Ancestry climber plugin in plain JS

jquery.climb-ancestry.js

/*
jQuery Ancestry Climber Plugin

Defines a class that traces an element's ancestry, executing
a callback on each ancestor.
 */

(function() {
  var AncestryClimber;

  AncestryClimber = (function() {
    function AncestryClimber(elem, callback) {
      this.elem = elem;
      this.callback = callback != null ? callback : $.noop;
      if (!this.elem) {
        throw new Error('Please supply a DOM element');
      }
      if (!this.callback) {
        throw new Error('Please supply a callback function');
      }
      this.$elem = $(this.elem);
      this.iterations = 0;
    }

    AncestryClimber.prototype.climbLevel = function(skipStop) {
      var $parent, stop;
      if (skipStop == null) {
        skipStop = true;
      }
      this.iterations += 1;
      $parent = this.$elem.parent();
      stop = this.callback.call(this.$elem, this.iterations) === false;
      if (skipStop) {
        stop = false;
      }
      this.$elem = $parent;
      if (!stop && $parent[0].nodeName !== '#document') {
        return this.climbLevel(false);
      }
    };

    return AncestryClimber;

  })();

  if (typeof jQuery === 'undefined') {
    return window.AncestryClimber = AncestryClimber;
  }

  $.fn.extend({
    climbAncestry: function(cb) {
      var climber;
      climber = new AncestryClimber($(this), cb);
      climber.climbLevel();
      return this;
    }
  });

}).call(this);