How can a Streamlit app remember a user’s choices when the script reruns? Session state stores per-session data as key-value pairs, preserving activity while a browser tab remains active. It provides a practical workaround for Streamlit’s behavior of reloading the entire script after input changes. section 14.4.1 section 14.4.3
A task-management app can track:
- The selected menu option, such as showing tasks, creating a task, or showing task details. section 14.4.3
- Sorting and filtering choices in one sorting_params dictionary, including sort key, order, statuses, urgencies, and selected content. section 14.4.3
Initialize and route from session state
Use st.session_state through a short alias, initialize missing values once, and route the app according to the stored menu choice: session = st.session_state if menu_key not in session: session[menu_key] = TaskierMenuOption.SHOW_TASKS.value session[working_task_key] = None session[sorting_params_key] = {x.value: None for x in TaskierFilterKey} if session[menu_key] == TaskierMenuOption.SHOW_TASKS.value: show_tasks() elif session[menu_key] == TaskierMenuOption.NEW_TASK.value: show_new_task_entry() The membership check prevents initialization from overwriting choices on later reruns.
