I recently work on streamlit and try to plot marker on folium map (for loop by lat lon on each dataframe rows) base on customized dataframe which selected from user.
I have found some issued
1.I cannot pass the input parameter(folium map object) into function when using button. I need to pass parameter because I have to use for loop to generate marker inside the function.
2.Global variable does not work as well - Because I cannot pass the parmeter via the button, so I decided to use button to initiate function and then use Global variable concept inside function instead, but seem streamlit cannot read global variable as well.
3.Marker plot only work when I follow this step
- Add map m=folium.Map(xxxx)
- folium_static(m, width=1400, height=450)
Which I cannot do this because I need to initially show map without marker, and only plot marker after user press button, However If I put folium_static inside the function (plotting maker function). the screen will add another map instead of ploting marker into the existing map
Steps to reproduce
def add_marker(): global m folium.Marker([25.042892210970322, 121.54525577135475]).add_to(m) m = folium.Map(location=[25.042892210970322, 121.54525577135475], zoom_start=8) folium_static(m, width=1400, height=450) with st.sidebar: add_maker_button = st.button("Plot_marker", on_click=add_marker)