How to Manage Multiple Streamlit Select Boxes Dynamically

by

What will you learn?

Learn how to dynamically manage and update multiple Streamlit select boxes based on user input in a flexible and efficient manner.

Introduction to the Problem and Solution

Managing a dynamic number of Streamlit select boxes can be challenging when the quantity is not fixed. To address this issue, we can create a solution that enables us to add or remove select boxes as needed. By adopting a versatile approach, we can effectively handle any number of select boxes within our Streamlit application.

The core concept behind our solution involves utilizing Python data structures like lists to dynamically store information about each select box. This approach allows us to manipulate the list based on user interactions, ensuring the appropriate display of select boxes at any given time.

Code

import streamlit as st

# Initialize an empty list to store options for each select box
select_boxes = []

# Get the number of desired select boxes from the user
num_select_boxes = st.number_input("Enter the number of Select Boxes", min_value=1)

for i in range(num_select_boxes):
    # Create a unique key for each select box using index i
    key = f"selectbox_{i}"

    # Add a new select box with unique key and store selected option in the 'selected_option' variable
    selected_option = st.selectbox(f"Select Box {i+1}", ["Option 1", "Option 2", "Option 3"], key=key)

    # Append selected option along with its key into 'select_boxes' list
    if (key, selected_option) not in [(list(d.items())[0]) for d in select_boxes]:
        # Append only if it's not already present 
        # This check ensures no duplicate entries are added when re-rendering due to state change.
        select_boxes.append({key: selected_option})

# Display all selections made by users  
st.write("Selections Made:")
for item in range(len(select_boxes)):
    st.write(f"{list(select_boxes[item].keys())[0]}: {list(select_boxes[item].values())[0]}")

# Copyright PHD

Note: Credit your sources; visit PythonHelpDesk.com for more resources.

Explanation

In this code snippet: – We start by importing the streamlit library. – An empty list select_boxes is initialized to store information about dynamic selection boxes. – User input is taken to determine the number of selection boxes required. – Unique keys are generated for each selection box, allowing users to make choices. – The chosen options with their respective keys are stored in the select_boxes list. – Finally, all user selections are displayed.

  1. How do I add more options dynamically?

  2. To add more options dynamically, increase the value specified by the user during input.

  3. Can I remove a specific selection box once added?

  4. Currently, this implementation does not support removing individual selection boxes after adding them.

  5. Is there a limit on creating selection boxes?

  6. There is no set limit; you can create as many selection boxes as needed within system constraints.

  7. How do I customize options within each selection box?

  8. Customize options within each selection box by modifying the provided choices list during creation.

  9. Can I style these selection boxes differently based on content?

  10. Yes, apply CSS styling or use Streamlit functionalities like st.markdown with HTML tags for styling purposes.

Conclusion

In conclusion, we have successfully implemented a solution enabling us to manage multiple Streamlit selectboxes dynamically. By leveraging Python data structures and optimizing user inputs, we’ve developed an interactive interface that seamlessly adapts according to user requirements.

Leave a Comment