Calculate position for Affix bottom

Created by: dark-cms

added positionbottom as Option-Value for affix()

so it is possible to calculate the css-bottom-value. Example: var $document = $(document); var $Affixparent = $("#ProductDetails");

// side bar
$('#affixtocart').affix({
  offset: {
    top: function() { return  $Affixparent.offset().top; },
    bottom: function() { return $Affixparent.offset().top + $Affixparent.height()/2; }
  },
    positionbottom : function() {
        return parseInt($document.height() - ($Affixparent.offset().top + $Affixparent.height())); 
    } 
  }

CSS: body {position: relative} .affix { position: fixed; top: 40px} .affix-bottom { position: absolute}

other css-positions not needed