add hidden index input from frontend and output it

add support for custom hidden fields

comfy_api/latest/_io.py

@@ -1344,7 +1344,8 @@ class Schema:
     """The category of the node, as per the "Add Node" menu."""
     inputs: list[Input] = field(default_factory=list)
     outputs: list[Output] = field(default_factory=list)
-    hidden: list[Hidden] = field(default_factory=list)
+    hidden: list[Hidden | str] = field(default_factory=list)
+    """Hidden inputs. Use Hidden enum for system values (PROMPT, UNIQUE_ID, etc.) or plain strings for custom frontend-provided values."""
     description: str=""
     """Node description, shown as a tooltip when hovering over the node."""
     search_aliases: list[str] = field(default_factory=list)
@@ -1443,6 +1444,9 @@ class Schema:
         input = create_input_dict_v1(self.inputs)
         if self.hidden:
             for hidden in self.hidden:
+                if isinstance(hidden, str):
+                    input.setdefault("hidden", {})[hidden] = (hidden,)
+                else:
                     input.setdefault("hidden", {})[hidden.name] = (hidden.value,)
         # create separate lists from output fields
         output = []
@@ -1504,6 +1508,9 @@ class Schema:
                 add_to_dict_v3(output, output_dict)
         if self.hidden:
             for hidden in self.hidden:
+                if isinstance(hidden, str):
+                    hidden_list.append(hidden)
+                else:
                     hidden_list.append(hidden.value)
 
         info = NodeInfoV3(

comfy_extras/nodes_logic.py

@@ -104,7 +104,11 @@ class CustomComboNode(io.ComfyNode):
             category="utils",
             is_experimental=True,
             inputs=[io.Combo.Input("choice", options=[])],
-            outputs=[io.String.Output()]
+            outputs=[
+                io.String.Output(display_name="STRING"),
+                io.Int.Output(display_name="INDEX"),
+            ],
+            hidden=["index"],
         )
 
     @classmethod
@@ -115,8 +119,8 @@ class CustomComboNode(io.ComfyNode):
         return True
 
     @classmethod
-    def execute(cls, choice: io.Combo.Type) -> io.NodeOutput:
-        return io.NodeOutput(choice)
+    def execute(cls, choice: io.Combo.Type, index: int = 0) -> io.NodeOutput:
+        return io.NodeOutput(choice, index)
 
 
 class DCTestNode(io.ComfyNode):

execution.py

@@ -192,6 +192,11 @@ def get_input_data(inputs, class_def, unique_id, execution_list=None, dynprompt=
                 hidden_inputs_v3[io.Hidden.auth_token_comfy_org] = extra_data.get("auth_token_comfy_org", None)
             if io.Hidden.api_key_comfy_org.name in hidden:
                 hidden_inputs_v3[io.Hidden.api_key_comfy_org] = extra_data.get("api_key_comfy_org", None)
+            # Handle custom hidden inputs from prompt data
+            system_hidden_names = {h.name for h in io.Hidden}
+            for hidden_name in hidden:
+                if hidden_name not in system_hidden_names and hidden_name in inputs:
+                    input_data_all[hidden_name] = [inputs[hidden_name]]
     else:
         if "hidden" in valid_inputs:
             h = valid_inputs["hidden"]