manage no update case (#134)

app/callbacks/data_callbacks.py

@@ -75,6 +75,7 @@ def login_callback(n_clicks, username, password, user_headers):
     [
         Output("store_api_events_data", "data"),
         Output("store_api_alerts_data", "data"),
+        Output("trigger_no_events", "data"),
     ],
     [Input("main_api_fetch_interval", "n_intervals")],
     [
@@ -117,6 +118,8 @@ def api_watcher(n_intervals, local_events, local_alerts, user_headers, user_cred
     # Fetch events
     api_events = pd.DataFrame(call_api(api_client.get_unacknowledged_events, user_credentials)())
     api_events = past_ndays_api_events(api_events, n_days=1)  # keep only events from today
+    if api_events.empty:
+        return dash.no_update, dash.no_update, True
     api_events = api_events[::-1]  # Display the last alert first
 
     if event_data_loaded:
@@ -179,6 +182,7 @@ def api_watcher(n_intervals, local_events, local_alerts, user_headers, user_cred
     return [
         json.dumps({"data": local_events.to_json(orient="split"), "data_loaded": True}),
         json.dumps({"data": local_alerts.to_json(orient="split"), "data_loaded": True}),
+        dash.no_update,
     ]
 
 

app/callbacks/display_callbacks.py

@@ -21,11 +21,11 @@
 # Loading initial data
 @app.callback(
     Output("modal-loading", "is_open"),
-    [Input("media_url", "data"), Input("user_headers", "data")],
+    [Input("media_url", "data"), Input("user_headers", "data"), Input("trigger_no_events", "data")],
     State("store_api_alerts_data", "data"),
     prevent_initial_call=True,
 )
-def toggle_modal(media_url, user_headers, local_alerts):
+def toggle_modal(media_url, user_headers, local_alerts, trigger_no_events):
     """
     Toggles the visibility of the loading modal waiting for the load of media_url
 
@@ -36,6 +36,8 @@ def toggle_modal(media_url, user_headers, local_alerts):
     Returns:
     - bool: True to show the modal, False to hide it.
     """
+    if trigger_no_events:
+        return False
     if user_headers is None:
         raise PreventUpdate
     local_alerts, alerts_data_loaded = read_stored_DataFrame(local_alerts)

app/layouts/main_layout.py

@@ -107,5 +107,6 @@ def get_main_layout():
             # [TEMPORARY FIX] Storing the user's credentials to refresh the token when needed
             dcc.Store(id="user_credentials", storage_type="session", data=user_credentials),
             dcc.Store(id="to_acknowledge", data=0),
+            dcc.Store(id="trigger_no_events", data=False),
         ]
     )