Update app.py

app.py

@@ -115,10 +115,10 @@ def main():
 
     pdf = st.file_uploader("Upload your PDF", type="pdf")
 
-    if pdf is not None:
-        query = st.text_input("Ask questions about your PDF file (in any preferred language):")
+    query = st.text_input("Ask questions about your PDF file (in any preferred language):")
 
-        if st.button("Ask") or (query and query != st.session_state.get('last_input', '')):
+    if st.button("Ask") or (query and query != st.session_state.get('last_input', '')):
+        if pdf is not None:
             st.session_state['last_input'] = query
             st.session_state['chat_history'].append(("User", query, "new"))
 
@@ -144,12 +144,19 @@ def main():
                 background_color = "#FFA07A" if chat[2] == "new" else "#acf" if chat[0] == "User" else "#caf"
                 new_messages_placeholder.markdown(f"<div style='background-color: {background_color}; padding: 10px; border-radius: 10px; margin: 10px;'>{chat[0]}: {chat[1]}</div>", unsafe_allow_html=True)
 
+            st.write("<script>document.getElementById('response').scrollIntoView();</script>", unsafe_allow_html=True)
+
             loading_message.empty()
 
             query = ""
+        else:
+            st.warning("Please upload a PDF file before asking questions.")
 
         st.session_state['chat_history'] = [(sender, msg, "old") for sender, msg, _ in st.session_state['chat_history']]
     
+
+
+    
     # Displaying example questions
     if not st.session_state['chat_history']:
         st.markdown("""