auto-disable checkbox if no data

src/callbacks.py

@@ -3,8 +3,7 @@ import logging as log
 import pandas as pd
 import plotly.graph_objects as go
 import xarray as xr
-from dash import Dash
-from dash.dependencies import Input, Output
+from dash import Dash, Input, Output, State
 from plotly.subplots import make_subplots
 
 
@@ -237,3 +236,24 @@ def register_timeseries_plot(app: Dash, timeseries_data: pd.DataFrame, var_info:
         fig_ts.update_yaxes(title=f"{secondary_variable} {unit_secondary}", secondary_y=True)
 
         return [fig_ts]
+
+
+def register_trajdatamissing_response(app: Dash):
+    """
+    Register callback to Disable the "show trajectories" checkbox if there is no
+    trajectory data.
+    """
+
+    @app.callback(
+        Output("trajectories-checkbox", "value"),
+        Input(
+            "confirm-trajdata-warning", "submit_n_clicks"
+        ),  # need at least on input field for the callback to work
+        State("trajectories-checkbox", "value"),
+    )
+    def handle_confirmation_response(submit_clicks, current_values):
+        if current_values is None:
+            return []
+        if current_values[0] == 1:
+            return []
+        return current_values