InterfaceGadget: Return previously computed values when available

gadget/gadget_interface.js

@@ -232,6 +232,12 @@
 
   rJS(window)
 
+    .ready(function (gadget) {
+      // Initialize the gadget local parameters
+      gadget.result_doc = {};
+    })
+
+
     .declareMethod("render", function (options) {
       return this.changeState(options);
     })
@@ -360,6 +366,8 @@
               error_message = summary_message + '\n\n' + error_message;
             }
             context.element.firstElementChild.textContent = error_message;
+            context.result_doc[
+              context.state.required_interface_list] = returned_result;
             return returned_result;
           })
 
@@ -375,6 +383,7 @@
         context.element.firstElementChild.textContent =
           "Unexpected error: " + context.state.error;
       }
+      return context.result_doc[context.state.required_interface_list];
     })
 
     .allowPublicAcquisition('reportServiceError', function (param_list) {