Slider: Reset positioning when orientation changes

Fixes #10105
Closes jquerygh-1268

Author: scottgonzalez

tests/unit/slider/slider_options.js

@@ -78,7 +78,7 @@ test( "min", function() {
 });
 
 test( "orientation", function() {
-	expect( 6 );
+	expect( 8 );
 	element = $( "#slider1" );
 
 	options = {
@@ -93,6 +93,7 @@ test( "orientation", function() {
 	element.slider( options ).slider( "option", "orientation", "horizontal" );
 	ok( element.is( ".ui-slider-horizontal" ), "horizontal slider has class .ui-slider-horizontal" );
 	ok( !element.is( ".ui-slider-vertical" ), "horizontal slider does not have class .ui-slider-vertical" );
+	equal( element.find( ".ui-slider-handle" )[ 0 ].style.bottom, "", "CSS bottom reset" );
 	equal( handle()[0].style.left, percentVal + "%", "horizontal slider handle is positioned with left: %" );
 
 	element.slider( "destroy" ) ;
@@ -109,6 +110,7 @@ test( "orientation", function() {
 	element.slider( options ).slider( "option", "orientation", "vertical" );
 	ok( element.is( ".ui-slider-vertical" ), "vertical slider has class .ui-slider-vertical" );
 	ok( !element.is( ".ui-slider-horizontal" ), "vertical slider does not have class .ui-slider-horizontal" );
+	equal( element.find( ".ui-slider-handle" )[ 0 ].style.left, "", "CSS left reset" );
 	equal( handle()[0].style.bottom, percentVal + "%", "vertical slider handle is positioned with bottom: %" );
 
 	element.slider( "destroy" );

ui/slider.js

@@ -454,6 +454,9 @@ return $.widget( "ui.slider", $.ui.mouse, {
 					.removeClass( "ui-slider-horizontal ui-slider-vertical" )
 					.addClass( "ui-slider-" + this.orientation );
 				this._refreshValue();
+
+				// Reset positioning from previous orientation
+				this.handles.css( value === "horizontal" ? "bottom" : "left", "" );
 				break;
 			case "value":
 				this._animateOff = true;