Fix query param

app.py

@@ -216,33 +216,53 @@ def run():
     # mode = st.sidebar.radio("Mode", ["Overview"])
     demonstration_dir = "./demonstrations"
 
-    # params = st.experimental_get_query_params()
-    params = st.query_params
-    print(params)
+    # # params = st.experimental_get_query_params()
+    # params = st.query_params
+    # print(params)
     
-    # list demonstrations/
+    # # list demonstrations/
+    # demo_names = os.listdir(demonstration_dir)
+
+    # if params.get("recording"):
+    #     if isinstance(params["recording"], list):
+    #         recording_name = params["recording"][0]
+    #     else:
+    #         recording_name = params["recording"]
+
+    # else:
+    #     recording_name = demo_names[0]
+    
+    # recording_name = st.sidebar.selectbox(
+    #     "Recordings",
+    #     demo_names,
+    #     index=demo_names.index(recording_name),
+    # )
+
+    # if recording_name != params.get("recording", [None])[0]:
+    #     # st.experimental_set_query_params(recording=recording_name)
+    #     # use st.query_params as a dict instead
+    #     st.query_params['recording'] = recording_name
+
+
     demo_names = os.listdir(demonstration_dir)
 
-    if params.get("recording"):
-        if isinstance(params["recording"], list):
-            recording_name = params["recording"][0]
-        else:
-            recording_name = params["recording"]
+    def update_recording_name():
+        st.query_params["recording"] = st.session_state.get("recording_name")
 
-    else:
-        recording_name = demo_names[0]
+    # For initial run, set the query parameter to the selected recording
+    if not st.query_params.get("recording"):
+        update_recording_name()
     
-    recording_name = st.sidebar.selectbox(
-        "Recordings",
-        demo_names,
-        index=demo_names.index(recording_name),
+    recording_name = st.query_params.get("recording")
+    if recording_name not in demo_names:
+        st.error(f"Recording `{recording_name}` not found. Please select another recording.")
+        st.stop()
+    
+    recording_idx = demo_names.index(recording_name)
+    st.sidebar.selectbox(
+        "Recordings", demo_names, on_change=update_recording_name, key="recording_name", index=recording_idx
     )
 
-    if recording_name != params.get("recording", [None])[0]:
-        # st.experimental_set_query_params(recording=recording_name)
-        # use st.query_params as a dict instead
-        st.query_params['recording'] = recording_name
-
     with st.sidebar:
         # Want a dropdown
         st.selectbox(