Bug 7931; Fixed bug that caused scrollTop and scrollLeft setters to return...

Bug 7931; Fixed bug that caused scrollTop and scrollLeft setters to return null when called on an empty jquery object

src/offset.js

@@ -261,13 +261,9 @@ jQuery.each( ["Left", "Top"], function( i, name ) {
 	var method = "scroll" + name;
 
 	jQuery.fn[ method ] = function(val) {
-		var elem = this[0], win;
+		var elem, win;
 
-		if ( !elem ) {
-			return null;
-		}
-
-		if ( val !== undefined ) {
+		if ( val != undefined ) {
 			// Set the scroll offset
 			return this.each(function() {
 				win = getWindow( this );
@@ -282,15 +278,19 @@ jQuery.each( ["Left", "Top"], function( i, name ) {
 					this[ method ] = val;
 				}
 			});
-		} else {
-			win = getWindow( elem );
-
-			// Return the scroll offset
-			return win ? ("pageXOffset" in win) ? win[ i ? "pageYOffset" : "pageXOffset" ] :
-				jQuery.support.boxModel && win.document.documentElement[ method ] ||
-					win.document.body[ method ] :
-				elem[ method ];
 		}
+		
+		elem = this[0];
+		if( !elem ) {
+			return null
+		}
+		
+		win = getWindow( elem );
+		// Return the scroll offset
+		return win ? ("pageXOffset" in win) ? win[ i ? "pageYOffset" : "pageXOffset" ] :
+			jQuery.support.boxModel && win.document.documentElement[ method ] ||
+				win.document.body[ method ] :
+			elem[ method ];
 	};
 });
 

test/unit/offset.js

@@ -333,7 +333,7 @@ testoffset("table", function( jQuery ) {
 });
 
 testoffset("scroll", function( jQuery, win ) {
-	expect(16);
+	expect(20);
 
 	var ie = jQuery.browser.msie && parseInt( jQuery.browser.version, 10 ) < 8;
 
@@ -379,6 +379,12 @@ testoffset("scroll", function( jQuery, win ) {
 	equals( jQuery(window).scrollLeft(), 0, "jQuery(window).scrollLeft() other window" );
 	equals( jQuery(document).scrollTop(), 0, "jQuery(window).scrollTop() other document" );
 	equals( jQuery(document).scrollLeft(), 0, "jQuery(window).scrollLeft() other document" );
+	
+	// Tests scrollTop/Left with empty jquery objects
+	ok( jQuery().scrollTop(100) != null, "jQuery().scrollTop(100) testing setter on empty jquery object" );
+	ok( jQuery().scrollLeft(100) != null, "jQuery().scrollLeft(100) testing setter on empty jquery object" );
+	ok( jQuery().scrollTop() === null, "jQuery().scrollTop(100) testing setter on empty jquery object" );
+	ok( jQuery().scrollLeft() === null, "jQuery().scrollLeft(100) testing setter on empty jquery object" );
 });
 
 testoffset("body", function( jQuery ) {