// Sticky Plugin v1.0.0 for jQuery// =============// Author: Anthony Garand// Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)// Improvements by Leonardo C. Daronco (daronco)// Created: 2/14/2011// Date: 2/12/2012// Website: http://labs.anthonygarand.com/sticky// Description: Makes an element on the page stick on the screen as you scroll//       It will only set the 'top' and 'position' of your element, you//       might need to adjust the width in some cases.
(function($) {  var defaults = {      topSpacing: 0,      bottomSpacing: 0,      className: 'is-sticky',      wrapperClassName: 'sticky-wrapper',      center: false,      getWidthFrom: '',      responsiveWidth: false    },    $window = $(window),    $document = $(document),    sticked = [],    windowHeight = $window.height(),    scroller = function() {      var scrollTop = $window.scrollTop(),        documentHeight = $document.height(),        dwh = documentHeight - windowHeight,        extra = (scrollTop > dwh) ? dwh - scrollTop : 0;
      for (var i = 0; i < sticked.length; i++) {        var s = sticked[i],          elementTop = s.stickyWrapper.offset().top,          etse = elementTop - s.topSpacing - extra;
        if (scrollTop <= etse) {          if (s.currentTop !== null) {            s.stickyElement              .css('position', '')              .css('top', '');            s.stickyElement.trigger('sticky-end', [s]).parent().removeClass(s.className);            s.currentTop = null;          }        }        else {          var newTop = documentHeight - s.stickyElement.outerHeight()            - s.topSpacing - s.bottomSpacing - scrollTop - extra;          if (newTop < 0) {            newTop = newTop + s.topSpacing;          } else {            newTop = s.topSpacing;          }          if (s.currentTop != newTop) {            s.stickyElement              .css('position', 'fixed')              .css('top', newTop);
            if (typeof s.getWidthFrom !== 'undefined') {              s.stickyElement.css('width', $(s.getWidthFrom).width());            }
            s.stickyElement.trigger('sticky-start', [s]).parent().addClass(s.className);            s.currentTop = newTop;          }        }      }    },    resizer = function() {      windowHeight = $window.height();
      for (var i = 0; i < sticked.length; i++) {        var s = sticked[i];        if (typeof s.getWidthFrom !== 'undefined' && s.responsiveWidth === true) {          s.stickyElement.css('width', $(s.getWidthFrom).width());        }      }    },    methods = {      init: function(options) {        var o = $.extend({}, defaults, options);        return this.each(function() {          var stickyElement = $(this);
          var stickyId = stickyElement.attr('id');          var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName           var wrapper = $('<div></div>')            .attr('id', stickyId + '-sticky-wrapper')            .addClass(o.wrapperClassName);          stickyElement.wrapAll(wrapper);
          if (o.center) {            stickyElement.parent().css({width:stickyElement.outerWidth(),marginLeft:"auto",marginRight:"auto"});          }
          if (stickyElement.css("float") == "right") {            stickyElement.css({"float":"none"}).parent().css({"float":"right"});          }
          var stickyWrapper = stickyElement.parent();          stickyWrapper.css('height', stickyElement.outerHeight());          sticked.push({            topSpacing: o.topSpacing,            bottomSpacing: o.bottomSpacing,            stickyElement: stickyElement,            currentTop: null,            stickyWrapper: stickyWrapper,            className: o.className,            getWidthFrom: o.getWidthFrom,            responsiveWidth: o.responsiveWidth          });        });      },      update: scroller,      unstick: function(options) {        return this.each(function() {          var unstickyElement = $(this);
          var removeIdx = -1;          for (var i = 0; i < sticked.length; i++)          {            if (sticked[i].stickyElement.get(0) == unstickyElement.get(0))            {                removeIdx = i;            }          }          if(removeIdx != -1)          {            sticked.splice(removeIdx,1);            unstickyElement.unwrap();            unstickyElement.removeAttr('style');          }        });      }    };
  // should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):  if (window.addEventListener) {    window.addEventListener('scroll', scroller, false);    window.addEventListener('resize', resizer, false);  } else if (window.attachEvent) {    window.attachEvent('onscroll', scroller);    window.attachEvent('onresize', resizer);  }
  $.fn.sticky = function(method) {    if (methods[method]) {      return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));    } else if (typeof method === 'object' || !method ) {      return methods.init.apply( this, arguments );    } else {      $.error('Method ' + method + ' does not exist on jQuery.sticky');    }  };
  $.fn.unstick = function(method) {    if (methods[method]) {      return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));    } else if (typeof method === 'object' || !method ) {      return methods.unstick.apply( this, arguments );    } else {      $.error('Method ' + method + ' does not exist on jQuery.sticky');    }
  };  $(function() {    setTimeout(scroller, 0);  });})(jQuery);