Prevent sticky from calling .offsetParent() on every method call by finding container only in init

src/definitions/modules/sticky.js

@@ -43,8 +43,8 @@ $.fn.sticky = function(parameters) {
 
         $module               = $(this),
         $window               = $(window),
-        $container            = $module.offsetParent(),
         $scroll               = $(settings.scrollContext),
+        $container,
         $context,
 
         selector              = $module.selector || '',
@@ -65,6 +65,7 @@ $.fn.sticky = function(parameters) {
 
         initialize: function() {
 
+          module.determineContainer();
           module.determineContext();
           module.verbose('Initializing sticky', settings, $container);
 
@@ -126,6 +127,10 @@ $.fn.sticky = function(parameters) {
           }
         },
 
+        determineContainer: function() {
+          $container = $module.offsetParent();
+        },
+
         determineContext: function() {
           if(settings.context) {
             $context = $(settings.context);
@@ -191,7 +196,7 @@ $.fn.sticky = function(parameters) {
             module.determineContext();
           }
           if(hardRefresh) {
-            $container = $module.offsetParent();
+            module.determineContainer();
           }
           module.save.positions();
           module.stick();
@@ -337,7 +342,7 @@ $.fn.sticky = function(parameters) {
             if(tagName === 'HTML' || tagName == 'body') {
               // this can trigger for too many reasons
               //module.error(error.container, tagName, $module);
-              $container = $module.offsetParent();
+              module.determineContainer();
             }
             else {
               if( Math.abs($container.height() - module.cache.context.height) > 5) {