How to append a list with user selectbox responses

🎈 Using Streamlit
1

Hi,
I have problem with collecting responses and write it as a list.

With this code i can append the links to the list. However, for the first link i chose “Yes” but it didn’t append the first link.

I think there is an index shift when adding the list of links. Even if the selectbox for the first link is Yes, it starts adding from the 2nd link.

      with st.form("my_form"):
        col1, col2 = st.columns(2)
        if st.session_state.papers:
             if st.session_state.count < len(st.session_state.papers):
                 st.write("Progress: ", st.session_state.count + 1 , "/", len(st.session_state.papers))
                 text = st.session_state.papers[st.session_state.count]["Description"]
                 link = st.session_state.papers[st.session_state.count]["Link"]
                 label = st.selectbox("Do you want to include this resource to your content?:", [None,"Yes","No"], index=None)
                 st.write(link)
                 res_box = st.empty()
                 for i in range(len(text) + 1):
                     res_box.markdown(" %s" % text[0:i])
                     time.sleep(0.003)  
                 if label == "Yes":
                    st.session_state.final_text.append(text)
                    st.session_state.final_link.append(link) 
                 st.session_state.count += 1  
                 with col2:
                    if st.form_submit_button("Next ⏭️"):  
                     next_quote()
                     st.session_state.label_list.append(label)
                    pass
             if st.session_state.count > 1:       
                 with col1:        
                   if st.form_submit_button("⏮️ Previous"): 
                       previous_quote()
                       st.session_state.label_list.pop()
                       if st.session_state.label_list[-1] == "Yes":
                          st.session_state.final_text.pop()  
                          st.session_state.final_link.pop()
                          pass        
             if index >= len(st.session_state.papers):
                st.write("All done!")
                final_submit = st.form_submit_button("Final Submit")
                if final_submit:
                    for text in st.session_state.final_text:
                        final_text += text + "\n" 
                    st.write(st.session_state.final_link)
2

hi @ceybe
The issue you’re facing is likely due to the fact that you’re incrementing the st.session_state.count before checking if the label is “Yes” and appending to the final list. As a result, the first item doesn’t get appended because you’ve already moved on to the next item.

To fix this, you should increment the count only after processing the current item.

with st.form("my_form"):
    col1, col2 = st.columns(2)
    if st.session_state.papers:
        if st.session_state.count < len(st.session_state.papers):
            st.write("Progress: ", st.session_state.count + 1 , "/", len(st.session_state.papers))
            text = st.session_state.papers[st.session_state.count]["Description"]
            link = st.session_state.papers[st.session_state.count]["Link"]
            label = st.selectbox("Do you want to include this resource to your content?:", [None,"Yes","No"], index=None)
            st.write(link)
            res_box = st.empty()
            for i in range(len(text) + 1):
                res_box.markdown(" %s" % text[0:i])
                time.sleep(0.003)  

            if label == "Yes":
                st.session_state.final_text.append(text)
                st.session_state.final_link.append(link) 

            # Increment count after processing the current item
            st.session_state.count += 1  

            with col2:
                if st.form_submit_button("Next ⏭️"):  
                    next_quote()
                    st.session_state.label_list.append(label)
                    pass

        if st.session_state.count > 1:       
            with col1:        
                if st.form_submit_button("⏮️ Previous"): 
                    previous_quote()
                    st.session_state.label_list.pop()
                    if st.session_state.label_list[-1] == "Yes":
                        st.session_state.final_text.pop()  
                        st.session_state.final_link.pop()
                        pass        
        if index >= len(st.session_state.papers):
            st.write("All done!")
            final_submit = st.form_submit_button("Final Submit")
            if final_submit:
                for text in st.session_state.final_text:
                    final_text += text + "\n" 
                st.write(st.session_state.final_link)