Class Animation: Use .attr( "class" ) instead of .attr( "className" )…

… and adjust the queueing logic for jQuery 1.6 compatibility. Fixes #7275 - $.effects.animateClass broken in jQuery 1.6."

ui/jquery.effects.core.js

@@ -234,45 +234,44 @@ $.effects.animateClass = function( value, duration, easing, callback ) {
 		easing = null;
 	}
 
-	return this.queue( 'fx', function() {
+	return this.queue(function() {
 		var that = $( this ),
 			originalStyleAttr = that.attr( 'style' ) || ' ',
 			originalStyle = filterStyles( getElementStyles.call( this ) ),
 			newStyle,
-			className = that.attr( 'className' );
+			className = that.attr( 'class' );
 
 		$.each( classAnimationActions, function(i, action) {
 			if ( value[ action ] ) {
 				that[ action + 'Class' ]( value[ action ] );
 			}
 		});
 		newStyle = filterStyles( getElementStyles.call( this ) );
-		that.attr( 'className', className );
-
-		that.animate( styleDifference( originalStyle, newStyle ), duration, easing, function() {
-			$.each( classAnimationActions, function( i, action ) {
-				if ( value[ action ] ) { 
-					that[ action + 'Class' ]( value[ action ] );
+		that.attr( 'class', className );
+
+		that.animate( styleDifference( originalStyle, newStyle ), {
+			queue: false,
+			duration: duration,
+			easing: easing,
+			complete: function() {
+				$.each( classAnimationActions, function( i, action ) {
+					if ( value[ action ] ) { 
+						that[ action + 'Class' ]( value[ action ] );
+					}
+				});
+				// work around bug in IE by clearing the cssText before setting it
+				if ( typeof that.attr( 'style' ) == 'object' ) {
+					that.attr( 'style' ).cssText = '';
+					that.attr( 'style' ).cssText = originalStyleAttr;
+				} else {
+					that.attr( 'style', originalStyleAttr );
 				}
-			});
-			// work around bug in IE by clearing the cssText before setting it
-			if ( typeof that.attr( 'style' ) == 'object' ) {
-				that.attr( 'style' ).cssText = '';
-				that.attr( 'style' ).cssText = originalStyleAttr;
-			} else {
-				that.attr( 'style', originalStyleAttr );
-			}
-			if ( callback ) { 
-				callback.apply( this, arguments );
+				if ( callback ) { 
+					callback.apply( this, arguments );
+				}
+				$.dequeue( this );
 			}
 		});
-
-		// $.animate adds a function to the end of the queue
-		// but we want it at the front
-		var queue = $.queue( this ),
-			anim = queue.splice( queue.length - 1, 1 )[ 0 ];
-		queue.splice( 1, 0, anim );
-		$.dequeue( this );
 	});
 };