jquery core: Closes #1681. jQuery.fn.toggleClass can accept a boolean argument...

jquery core: Closes #1681. jQuery.fn.toggleClass can accept a boolean argument indicating add/remove.

src/core.js

@@ -1284,8 +1284,10 @@ jQuery.each({
 		jQuery.className.remove( this, classNames );
 	},
 
-	toggleClass: function( classNames ) {
-		jQuery.className[ jQuery.className.has( this, classNames ) ? "remove" : "add" ]( this, classNames );
+	toggleClass: function( classNames, state ) {
+		if( typeof state !== "boolean" )
+			state = !jQuery.className.has( this, classNames );
+		jQuery.className[ state ? "add" : "remove" ]( this, classNames );
 	},
 
 	remove: function( selector ) {

test/unit/core.js

@@ -1493,13 +1493,20 @@ test("removeClass(String) - simple", function() {
 });
 
 test("toggleClass(String)", function() {
-	expect(3);
+	expect(6);
 	var e = jQuery("#firstp");
 	ok( !e.is(".test"), "Assert class not present" );
 	e.toggleClass("test");
 	ok( e.is(".test"), "Assert class present" );
 	e.toggleClass("test");
 	ok( !e.is(".test"), "Assert class not present" );
+
+	e.toggleClass("test", false);
+	ok( !e.is(".test"), "Assert class not present" );
+	e.toggleClass("test", true);
+	ok( e.is(".test"), "Assert class present" );
+	e.toggleClass("test", false);
+	ok( !e.is(".test"), "Assert class not present" );
 });
 
 test("removeAttr(String", function() {