Update app.py

app.py

@@ -13,6 +13,7 @@ load_dotenv()
 os.environ["OPENAI_API_KEY"] = st.secrets["OPENAI_API_KEY"]
 os.environ["LANGCHAIN_TRACING_V2"]="true"
 os.environ["LANGCHAIN_API_KEY"] = st.secrets["LANGCHAIN_API_KEY"]
+
 def get_pdf_text(pdf_docs):
     text = ""
     for pdf in pdf_docs:
@@ -70,16 +71,18 @@ def main():
         st.session_state.chat_history = []
 
     with st.sidebar:
-#        st.logo("pic123.png")
         st.image("pic123.png")
         st.title("Menu:")
         pdf_docs = st.file_uploader("Upload your PDF Files and Click on the Submit & Process Button", accept_multiple_files=True)
         if st.button("Submit & Process"):
-            with st.spinner("Processing..."):
-                raw_text = get_pdf_text(pdf_docs)
-                text_chunks = get_text_chunks(raw_text)
-                get_vector_store(text_chunks)
-                st.success("Done")
+            if pdf_docs:
+                with st.spinner("Processing..."):
+                    raw_text = get_pdf_text(pdf_docs)
+                    text_chunks = get_text_chunks(raw_text)
+                    get_vector_store(text_chunks)
+                    st.success("Done")
+            else:
+                st.warning("Please upload PDF files first before submitting.")
 
     # Display chat history
     for idx, chat in enumerate(st.session_state.chat_history):
@@ -97,10 +100,14 @@ def main():
     user_question = st.chat_input("Ask a Question from the PDF Files")
 
     if user_question:
-        st.session_state.chat_history.append({"role": "user", "content": user_question})
-        st.chat_message("user").write(user_question)
-        user_input(user_question)
-        st.experimental_rerun()
+        if not pdf_docs:
+            st.warning("Please upload PDF files first before asking questions.")
+        else:
+            st.session_state.chat_history.append({"role": "user", "content": user_question})
+            st.chat_message("user").write(user_question)
+            user_input(user_question)
+            st.experimental_rerun()
 
 if __name__ == "__main__":
     main()
+