diff --git a/singletree.py b/singletree.py
index 33a9ac6..da2ed36 100644
--- a/singletree.py
+++ b/singletree.py
@@ -58,6 +58,9 @@ ui_tmpl = """
 {% if dataparams %}
 		"dataparams": {{json.dumps(dataparams)}},
 {% endif %}
+{% if newdata_params %}
+		"newdata_params":{{json.dumps(newdata_params)}},
+{% endif %}
 {% if get_data_url %}
 		"dataurl": "{{get_data_url}}",
 {% else %}