!function ($) {

  "use strict"; // jshint ;_;


 /* DROPDOWN CLASS DEFINITION
  * ========================= */

  var getDropdownSelector = function(obj) {
	  var selector = obj.attr('dropdown');

      if (!selector) {
        selector = obj.attr('href');
        selector = selector && selector.replace(/.*(?=#[^\s]*$)/, '') //strip for ie7
      }

      return $(selector);
  },Dropdown = function (element) {
      var $el = $(element).bind('click.dropdown.data-api', this.toggle);
      $('html').bind('click.dropdown.data-api', function () {
      	getDropdownSelector($el).removeClass('open');
      });
  };

  Dropdown.prototype = {

    constructor: Dropdown

  , toggle: function (e) {
      var $this = $(this)
        , selector
        , isActive;

      if ($this.is('.disabled, :disabled')) return

      selector = getDropdownSelector($this);
      if(selector.length == 0) {
    	  return false;
      }
      isActive = selector.hasClass('open');

      clearMenus();

      if (!isActive) {
    	  if($this.attr('id')) {
    		  //璁板綍涓€涓嬭皝鎵撳紑鐨
    		  selector.attr('dropdown-sourceid', $this.attr('id'));
    	  }else{
    		  selector.removeAttr('dropdown-sourceid');
    	  }
    	  var pos = $this.position(),
	      	  top = pos.top + $this.height(),
	      	  left = pos.left;
    	  if($this.parent()[0]== selector.parent()[0]) {
    		  //濡傛灉閮戒綅浜庡悓涓€涓鍣ㄧ殑璇
    		  //鐩存帴鐢╬osition灏卞彲浠
    	  }else{
    		  var offsetParent = $this.offsetParent(),
    	      	  selectorParent = selector.offsetParent();
	    	  while(offsetParent[0] != selectorParent[0] && offsetParent[0] != document.body) {
	    		  //淇濊瘉瑕佽绠楃殑鎸夐挳鐨刼ffsetParent涓庤彍鍗曠殑offsetParent淇濇寔涓€鑷达紝杩欐牱灏卞ソ璁＄畻浣嶇疆浜
	    		  top += offsetParent.position().top + offsetParent.scrollTop();
	    		  left += offsetParent.position().left + offsetParent.scrollLeft();
	    		  offsetParent = offsetParent.offsetParent();
	    	  }
	    	  if(offsetParent[0] == selectorParent[0]) {
	    		  //濡傛灉鑿滃崟涓庢寜閽綅浜庡悓涓€涓鍣ㄥ唴锛屽垯鍙渶瑕佽绠楁湰offsetParent鐨勬粴鍔ㄦ潯鐨勪綅缃
	    		  top += offsetParent.scrollTop();
	    		  left += offsetParent.scrollLeft();
	    	  }
    	  }
    	  
    	  if($.browser.msie && $.browser.version < 8) {
    		  //IE6/7
    		  top += 2;
    	  }
    	  selector.css({ left: left, top: top }).toggleClass('open');
    	  //瑙﹀彂鎵撳紑浜嬩欢
    	  selector.trigger('dropdown.open', [$this.attr('id')]);
      }

      return false;
    }

  }

  function clearMenus() {
	  $('.dropdown-menu.open').removeClass('open');
  }


  /* DROPDOWN PLUGIN DEFINITION
   * ========================== */

  $.fn.dropdown = function (option) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('dropdown');
      if (!data) $this.data('dropdown', (data = new Dropdown(this)));
      if (typeof option == 'string') data[option].call($this);
    });
  }

  $.fn.dropdown.Constructor = Dropdown;

}(window.jQuery);