demo: getContent on every render

demo/gadget_demo_json_schema_form.js

@@ -155,14 +155,21 @@
       var g = this;
       return g.getDeclaredGadget("form_view")
         .push(function (form_view) {
-          if (g.state.json_document) {
-            document.getElementById("json_document_content").textContent =
-              JSON.stringify(g.state.json_document, null, "  ");
-          }
           return form_view.render({
             value: g.state.json_document,
             schema_url: g.state.schema_url
-          });
+          })
+            .push(function () {
+              return form_view.getContent();
+            })
+            .push(function (ret) {
+              if (ret === undefined) {
+                ret = {};
+              }
+              g.state.json_document = ret;
+              document.getElementById("json_document_content").textContent =
+                JSON.stringify(ret, null, "  ");
+            });
         });
     });