Draggable: append divs to iframe parent for iframefix

This allows the blocking div to move with the iframe in
most situations, whereas appending to the body wouldn't.

Fixes #9671

tests/unit/draggable/draggable_options.js

@@ -1334,4 +1334,46 @@ test( "zIndex, default, switching after initialization", function() {
 
 });
 
+test( "iframeFix", function() {
+	expect( 5 );
+
+	var element = $( "<div>" ).appendTo( "#qunit-fixture" ).draggable({ iframeFix: true }),
+		element2 = $( "<div>" ).appendTo( "#qunit-fixture" ).draggable({ iframeFix: ".iframe" }),
+		iframe = $( "<iframe>" ).appendTo( element );
+
+	element2
+		.append( "<iframe class='iframe'></iframe>" )
+		.append( "<iframe>" );
+
+	iframe.css({
+		width: 1,
+		height: 1
+	});
+
+	element.one( "drag", function() {
+		var div = $( this ).children().not( "iframe" );
+		// http://bugs.jqueryui.com/ticket/9671
+		// iframeFix doesn't handle iframes that move
+		equal( div.length, 1, "blocking div added as sibling" );
+		equal( div.outerWidth(), iframe.outerWidth(), "blocking div is wide enough" );
+		equal( div.outerHeight(), iframe.outerHeight(), "blocking div is tall enough" );
+		deepEqual( div.offset(), iframe.offset(), "blocking div is tall enough" );
+	});
+
+	element.simulate( "drag", {
+		dx: 1,
+		dy: 1
+	});
+
+	element2.one( "drag", function() {
+		var div = $( this ).children().not( "iframe" );
+		equal( div.length, 1, "blocking div added as sibling only to matching selector" );
+	});
+
+	element2.simulate( "drag", {
+		dx: 1,
+		dy: 1
+	});
+});
+
 })( jQuery );

ui/draggable.js

@@ -109,20 +109,32 @@ $.widget("ui.draggable", $.ui.mouse, {
 			return false;
 		}
 
-		$(o.iframeFix === true ? "iframe" : o.iframeFix).each(function() {
-			$("<div class='ui-draggable-iframeFix' style='background: #fff;'></div>")
-			.css({
-				width: this.offsetWidth + "px", height: this.offsetHeight + "px",
-				position: "absolute", opacity: "0.001", zIndex: 1000
-			})
-			.css($(this).offset())
-			.appendTo("body");
-		});
+		this._blockFrames( o.iframeFix === true ? "iframe" : o.iframeFix );
 
 		return true;
 
 	},
 
+	_blockFrames: function( selector ) {
+		this.iframeBlocks = this.document.find( selector ).map(function() {
+			var iframe = $( this );
+
+			return $( "<div>" )
+				.css( "position", "absolute" )
+				.appendTo( iframe.parent() )
+				.outerWidth( iframe.outerWidth() )
+				.outerHeight( iframe.outerHeight() )
+				.offset( iframe.offset() )[ 0 ];
+		});
+	},
+
+	_unblockFrames: function() {
+		if ( this.iframeBlocks ) {
+			this.iframeBlocks.remove();
+			delete this.iframeBlocks;
+		}
+	},
+
 	_blurActiveElement: function( event ) {
 		var document = this.document[ 0 ];
 
@@ -297,10 +309,7 @@ $.widget("ui.draggable", $.ui.mouse, {
 	},
 
 	_mouseUp: function( event ) {
-		//Remove frame helpers
-		$("div.ui-draggable-iframeFix").each(function() {
-			this.parentNode.removeChild(this);
-		});
+		this._unblockFrames();
 
 		//If the ddmanager is used for droppables, inform the manager that dragging has stopped (see #5003)
 		if ( $.ui.ddmanager ) {