Quality now has sortable lists for configuring Profiles, saving not implemented yet.

NzbDrone.Web/Helpers/HtmlPrefixScopeExtensions.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Web.Mvc;
+using System.Web;
+using System.Collections.Generic;
+
+namespace NzbDrone.Web.Helpers
+{
+    public static class HtmlPrefixScopeExtensions
+    {
+        private const string idsToReuseKey = "__htmlPrefixScopeExtensions_IdsToReuse_";
+
+        public static IDisposable BeginCollectionItem(this HtmlHelper html, string collectionName)
+        {
+            var idsToReuse = GetIdsToReuse(html.ViewContext.HttpContext, collectionName);
+            string itemIndex = idsToReuse.Count > 0 ? idsToReuse.Dequeue() : Guid.NewGuid().ToString();
+
+            // autocomplete="off" is needed to work around a very annoying Chrome behaviour whereby it reuses old values after the user clicks "Back", which causes the xyz.index and xyz[...] values to get out of sync.
+            html.ViewContext.Writer.WriteLine(string.Format("<input type=\"hidden\" name=\"{0}.index\" autocomplete=\"off\" value=\"{1}\" />", collectionName, itemIndex)); 
+
+            return BeginHtmlFieldPrefixScope(html, string.Format("{0}[{1}]", collectionName, itemIndex));
+        }
+
+        public static IDisposable BeginHtmlFieldPrefixScope(this HtmlHelper html, string htmlFieldPrefix)
+        {
+            return new HtmlFieldPrefixScope(html.ViewData.TemplateInfo, htmlFieldPrefix);
+        }
+
+        private static Queue<string> GetIdsToReuse(HttpContextBase httpContext, string collectionName)
+        {
+            // We need to use the same sequence of IDs following a server-side validation failure,  
+            // otherwise the framework won't render the validation error messages next to each item.
+            string key = idsToReuseKey + collectionName;
+            var queue = (Queue<string>)httpContext.Items[key];
+            if (queue == null) {
+                httpContext.Items[key] = queue = new Queue<string>();
+                var previouslyUsedIds = httpContext.Request[collectionName + ".index"];
+                if (!string.IsNullOrEmpty(previouslyUsedIds))
+                    foreach (string previouslyUsedId in previouslyUsedIds.Split(','))
+                        queue.Enqueue(previouslyUsedId);
+            }
+            return queue;
+        }
+
+        private class HtmlFieldPrefixScope : IDisposable
+        {
+            private readonly TemplateInfo templateInfo;
+            private readonly string previousHtmlFieldPrefix;
+
+            public HtmlFieldPrefixScope(TemplateInfo templateInfo, string htmlFieldPrefix)
+            {
+                this.templateInfo = templateInfo;
+
+                previousHtmlFieldPrefix = templateInfo.HtmlFieldPrefix;
+                templateInfo.HtmlFieldPrefix = htmlFieldPrefix;
+            }
+
+            public void Dispose()
+            {
+                templateInfo.HtmlFieldPrefix = previousHtmlFieldPrefix;
+            }
+        }
+    }
+}