Update app.py

app.py

@@ -1,66 +1,15 @@
 import streamlit as st
-
+from streamlit_option_menu import option_menu
 for k, v in st.session_state.items():
     st.session_state[k] = v
 
-# --- SHARED ON ALL PAGES ---
-#st.logo(image=":material/medical_information:")
-#st.logo(image="images/medical_information_24dp_1F1F1F_FILL0_wght400_GRAD0_opsz24.png") 
-st.logo(image="images/menu_book_60dp_75FBFD.png")
-st.navigation("SBS Codes V2.0 Mapper")
-
-# --- PAGE SETUP ---
-start_page = st.Page(
-    page="pages/chapter_index.py",
-    title="Saudi Billing System Chapter Index",
-    icon=":material/home:",
-    default=True,)
-
-type_text_page = st.Page(
-    page="pages/type_text.py",
-    title="DEMO type text",
-    icon=":material/keyboard:",
-    default=False,)
-
-upload_file_page = st.Page(
-    page="pages/upload_file.py",
-    title="DEMO upload file (not yet active)",
-    icon=":material/file_upload:",
-    default=False,)
-
-about_page = st.Page(
-    page="pages/about.py",
-    title="About the app",
-    icon=":material/info:",
-    default=False)
-
-#PAGES = {
-#    "Chapter Index": "pages/chapter_index.py" ,
-#    "DEMO type_text": "pages/type_text.py",
-#    "DEMO upload file (not yet active)": "pages/upload_file.py",
-#    "About": "pages/about.py",
-#}
-
-#selection = st.sidebar.radio("Pages", list(PAGES.keys()))
-#selection = st.sidebar.radio("Pages", [start_page, type_text_page, upload_file_page, about_page])
-#page = PAGES[selection]
-
-# --- NAVIGATION SETUP ---
-pg = st.navigation(pages=[start_page, type_text_page, upload_file_page, about_page]) # WITHOUT SECTIONS
-#pg = st.navigation({"Chapter_Index": [start_page], "Demo": [type_text_page, upload_file_page], "About": [about_page]}) # WITH SECTIONS
-pg.run() 
-
-st.sidebar.text("Project by JA-RAD")
-
-def filter_chapters_env(df, chapter_column_name):
-    chapter_names = st.sidebar.multiselect(
-        label="Chapter Name", options=df[chapter_column_name].unique(), default=st.session_state.get("chapter_names"), key='filter_chapters', on_change=update_chapters
+with st.sidebar:
+    selected=option_menu(
+    	menu_title = "SBS V2.0 Mapper",
+    	options = ["Chapters for selection", "DEMO for text entry", "DEMO for file upload (*not active)", "About the app"]
+    	icons = [":material/home:", ":material/keyboard:", ":material/file_upload:", ":material/info:"],
+        menu_icon = "images/menu_book_60dp_75FBFD.png",
+        default_index = 0,
     )
-    st.session_state["chapter_names"] = chapter_names
-
-    if chapter_names:
-        df = df[df["chapter_name"].isin(chapter_names)]
-    return df
+st.sidebar.text("Project by JA-RAD")
 
-def update_chapters():
-   st.session_state["chapter_names"] = st.session_state.filter_chapters