getContent can be return part of json document

jsonform.gadget.js

@@ -648,6 +648,23 @@
       .push(schema_arr_marker);
   }
 
+  function convertOnMultiLevel(d, key) {
+    var ii,
+      kk,
+      key_list = key.split("/");
+    for (ii = 1; ii < key_list.length; ii += 1) {
+      kk = decodeJsonPointer(key_list[ii]);
+      if (ii === key_list.length - 1) {
+        return d[kk];
+      } else {
+        if (!d.hasOwnProperty(kk)) {
+          return;
+        }
+        d = d[kk];
+      }
+    }
+  }
+
   rJS(window)
     .ready(function () {
       var g = this;
@@ -925,7 +942,7 @@
       }
     }, 500)
 
-    .declareMethod('getContent', function () {
+    .declareMethod('getContent', function (sub_path) {
       var g = this;
       if (g.state.editable) {
         return g.props.form_gadget.getContent()
@@ -935,6 +952,9 @@
             // its parent call render with the same value
             // (as ERP5 does in case of formulator error)
             g.state.value = JSON.stringify(value);
+            if (sub_path) {
+              value = convertOnMultiLevel(value, sub_path);
+            }
             if (g.state.key) {
               var form_data = {};
               value = JSON.stringify(value);