Fix setting only one property at a time in .offset({})

diff --git a/src/offset.js b/src/offset.js
index 365b35aca8ec5091babf1c15a82351c1a5f81bbe..59591caea68913c07c569b279ab314100bf895f6 100644 (file)
--- a/src/offset.js
+++ b/src/offset.js
@@ -157,16 +157,19 @@ jQuery.offset = {
                var curElem   = jQuery( elem ),
                        curOffset = curElem.offset(),
                        curTop    = parseInt( jQuery.curCSS( elem, "top",  true ), 10 ) || 0,
-                       curLeft   = parseInt( jQuery.curCSS( elem, "left", true ), 10 ) || 0;
+                       curLeft   = parseInt( jQuery.curCSS( elem, "left", true ), 10 ) || 0,
+                       props     = {};
 
                if ( jQuery.isFunction( options ) ) {
                        options = options.call( elem, i, curOffset );
                }
 
-               var props = {
-                       top:  (options.top  - curOffset.top)  + curTop,
-                       left: (options.left - curOffset.left) + curLeft
-               };
+               if (options.top != null) {
+                       props.top = (options.top - curOffset.top) + curTop;
+               }
+               if (options.left != null) {
+                       props.left = (options.left - curOffset.left) + curLeft;
+               }
                
                if ( "using" in options ) {
                        options.using.call( elem, props );