does not refresh the map automatically


Using the example code from tutorial to show the uber data on NY map. After inserting the slider code I was expecting to see the map refresh based on the value from the slider. But it only refreshes if I resize and reset the map.

Steps to reproduce

Code snippet:

st.title('Uber pickups in NYC')

DATE_COLUMN = 'date/time'
DATA_URL = (''

def load_data(nrows):
    data = pd.read_csv(DATA_URL, nrows=nrows)
    lowercase = lambda x: str(x).lower()
    data.rename(lowercase, axis='columns', inplace=True)     
    data[DATE_COLUMN] = pd.to_datetime(data[DATE_COLUMN])
    return data

data_load_state = st.text('loading data ...')
data = load_data(10000)
data_load_state.text('done (cached data).')

if st.checkbox('show raw data'):
    st.subheader('Raw data')

st.subheader('Number of pickups by hour')
hist_values = np.histogram(
    data[DATE_COLUMN].dt.hour, bins=24, range=(0,24))[0]

hour_to_filter = st.slider('hour', 0, 23, 6)  # min: 0h, max: 23h, default: 17h
st.subheader(f'Map of all pickups at {hour_to_filter}:00')
filtered_data = data[data[DATE_COLUMN].dt.hour == hour_to_filter]
st.write(f'read nrows: {len(filtered_data)}')

If applicable, please provide the steps we should take to reproduce the error or specified behavior.

Expected behavior:

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Actual behavior:

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Debug info

  • Streamlit version: (get it with $ streamlit version)
  • Python version: (get it with $ python --version)
  • Using Conda? PipEnv? PyEnv? Pex?
  • OS version:
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Additional information

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Hm I just made some changes to to make it faster and to cache the map as we were always parsing the json and causing the map to be extremely slow. I was able to reproduce this and so can you create a bug under and I will try to prioritize it when I can?




1 Like

@willhuang you could reprocess (and update the cache) only if the data changed.