Hi, Have you ever found it frustrating to use widgets with initialized values, getting those values to survive through script reruns and noticed how sometimes you have to double click to get the value to stick? We all have! This seems to be a common issue amongst new Streamlit users, so I wrote a …

I would expect a double click needed in case 2. Say the widget is in sync: it has it’s initial value and is outputting its initial value. st.session_state.A2 = st.number_input( label="What is A2?", min_value=0, max_value=100, value=st.session_state.A2, key='num_A2' ) You click o…

@marduk Not that I know, sorry. Perhaps ask @blackary , who may provide a better explanation than I have given in the tutorial, as to why this case exists.

Nice trick @mathcatsand , but it sure is a mind bender, isn’t it!? :upside_down_face:

I recommend people try Streamlit all the time but I have to say that session state is one of the most frustrating thing about using it. The Streamlit learning curve is fairly low until you get to any kind of state management. At a minimum I feel like the docs need a lot more examples. That being sa…

“I don’t entirely understand why this works … I’m not even going to question it” The rules are simple: 1. Widget values are not in session state if they are not visible on the page; their values are actually deleted if they are not re-rendered in the top-down rerun. 2. The simplest way to persist a…

Mini-tutorial: Initializing widget values and getting them to stick without double presses

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marduk February 5, 2023, 10:31am 2

Hi @asehmi ,

Thanks for putting this tutorial together, super appreciated.

Did you, the Streamlit team or anyone finally figure out why the 2nd case is happening? It is still happening with Streamlit 1.17.0

Widget value snaps back every second time when read/write to file

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Mini-tutorial: Initializing widget values and getting them to stick without double presses

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