Merge pull request marcj#138 from Fuffi/master

Added keepInViewport option

Author: Marc J. Schmidt

jquery.selectBox.js

@@ -460,8 +460,8 @@
             , scrollPos = $(window).scrollTop()
             , heightToTop = pos.top - scrollPos
             , heightToBottom = $(window).height() - ( heightToTop + controlHeight )
-            , posTop = heightToTop > heightToBottom
-            , top = posTop 
+            , posTop = (heightToTop > heightToBottom) && (settings.keepInViewport == null ? true : settings.keepInViewport)
+            , top = posTop
                   ? pos.top - optionsHeight + borderTopWidth + topPositionCorrelation
                   : pos.top + controlHeight - borderBottomWidth - bottomPositionCorrelation;        
 

readme.md

@@ -53,6 +53,7 @@ $('select').selectBox({
 | topPositionCorrelation    | `0`           | Integer                    | Will be plused to top position if droplist will be show at the top            |
 | bottomPositionCorrelation | `0`           | Integer                    | Will be substracted from top position if droplist will be shown at the bottom |
 | hideOnWindowScroll        | `true`        | Boolean                    | If false then showed droplist will not hide itself on window scroll event     |
+| keepInViewport            | `true`        | Boolean                    | If set to false, the droplist will be always open towards the bottom          |
 
 
 To specify settings after the init, use this syntax: