fix and speedup render_schema_selector

gadget_json_generated_form.js

@@ -451,8 +451,7 @@
                   }
                   for (x = 0; x < schema_alternatives.length; x += 1) {
                     item = schema_alternatives[x];
-                    // need speedup by using array index
-                    item_list.push([item.title, JSON.stringify(item.value)]);
+                    item_list.push([item.title, x]);
                   }
                   return {
                     name: scope,
@@ -468,7 +467,7 @@
                     event: function () {
                       return g.getContent()
                         .push(function (value) {
-                          return event(JSON.parse(value[scope]));
+                          return event(schema_alternatives[value[scope]].value);
                         })
                         .push(function () {
                           return gadget.processValidation();
@@ -890,7 +889,7 @@
               for (x = 0; x < schema_alternatives.length; x += 1) {
                 item = schema_alternatives[x];
                 if (!used_properties.hasOwnProperty(item.value.property_name)) {
-                  item_list.push([item.title, JSON.stringify(item.value)]);
+                  item_list.push([item.title, x]);
                 }
               }
               return {