diff --git a/json/discount_detail_list.json b/json/discount_detail_list.json
index 020267b..973e338 100644
--- a/json/discount_detail_list.json
+++ b/json/discount_detail_list.json
@@ -22,6 +22,15 @@
       "new_data_url": "{{entire_url('../api/discount_detail_create.dspy')}}",
       "update_data_url": "{{entire_url('../api/discount_detail_update.dspy')}}",
       "delete_data_url": "{{entire_url('../api/discount_detail_delete.dspy')}}"
-    }
+    },
+    "binds": [
+      {
+        "wid": "prodtypeid",
+        "event": "changed",
+        "actiontype": "script",
+        "widget": "productid",
+        "script": "await this.loadData({prodtypeid: params.prodtypeid});"
+      }
+    ]
   }
 }