Update app.py

app.py

@@ -41,7 +41,12 @@ def factorial(n):
 
 # callback to update query param on selectbox change
 def update_params():
-    st.experimental_set_query_params(option=st.session_state.query)
+    try:
+        st.experimental_set_query_params(option=st.session_state.query)
+    except ValueError:
+        pass
+    
+# radio button options - plan is to hydrate when selected and change url along with textbox and search
 options = ["ai", "nlp", "iot", "vr", "genomics", "graph", "cognitive"]
 query_params = st.experimental_get_query_params()
 # set selectbox value based on query param, or provide a default
@@ -57,13 +62,13 @@ selected_option = st.radio(
 # set query param based on selection
 st.experimental_set_query_params(option=selected_option)
 
-
+# second set of controls, check the query params
 try:
     query_params = st.experimental_get_query_params()
     query_option = query_params['query'][0] #throws an exception when visiting http://host:port
     option_selected = st.sidebar.selectbox('Pick option', options, index=options.index(query_option))
 except: # catch exception and set query param to predefined value
-    st.experimental_set_query_params(query="Genomics") # defaults to dog
+    st.experimental_set_query_params(query="Genomics") # set default
     query_params = st.experimental_get_query_params()
     query_option = query_params['query'][0]
     
@@ -72,9 +77,11 @@ if 'query' not in st.session_state:
     query = st.text_input("", value="artificial intelligence", key="query")
 else:
     query = st.text_input("", value=st.session_state["query"], key="query")
-    if 'query' not in st.session_state: (st.session_state.query = query) # set already above.  this prevents two interface elements setting it first time once
+    st.session_state.query = query  # if set already above.  this prevents two interface elements setting it first time once
+    
 if 'query' not in st.session_state:
-    st.session_state.query = 'Genomics'    
+    st.session_state.query = 'Genomics' 
+       
 st.write(st.session_state.query)