Add drag and drop to structure side_bar

app/views/admin/items/_site_map_left_bar.html.erb

@@ -1 +1,28 @@
-<%= render_node_and_children(Item.first(:conditions => {:parent_id => nil})) %>
+<%= render_node_and_children(Item.first(:conditions => {:parent_id => nil})) %>
+
+
+<script>
+	$(document).ready(function(){
+		$('ol.sortable').nestedSortable({
+			disableNesting: 'no-nest',
+			forcePlaceholderSize: true,
+			handle: 'div',
+			helper:	'clone',
+			items: 'li',
+			maxLevels: 3,
+			opacity: .6,
+			placeholder: 'placeholder',
+			revert: 250,
+			tabSize: 25,
+			tolerance: 'pointer',
+			toleranceElement: '> div',
+
+			stop: function(event, ui) {
+				$.post("<%= admin_update_position_path %>", { id: ui.item.attr('id'), parent_id: ui.item.parent().closest('li').attr('id'), position: ui.item.index() } );
+        // console.log("parent: " + ui.item.parent().closest('li').attr('id'));
+        // console.log("id: " + ui.item.attr('id'));
+        // console.log("position: " + ui.item.index());
+    	}
+		});
+	});
+</script>