Filter a dataframe after clicking on a particular point on the map using PyDeck

maverick · June 1, 2022, 12:42pm

Hello

i’m using pydeck to plot points from a dataframe but i would like to print informations outside the map about a particular point select by a click on the map.

i don’t have find a solution about it, can someone tell me if it’s possible actually or not in streamlit ?

randyzwitch · June 1, 2022, 9:06pm

Hi @maverick, welcome to the Streamlit community!

If you are talking about st.pydeck_chart, then currently no, this isn’t possible but it has been identified as a potential improvement to Streamlit. However, there is a sample app using streamlit-folium that does something similar to what you are describing:

github.com

randyzwitch/streamlit-folium/blob/master/examples/interactive_app.py

from dataclasses import dataclass
from typing import Dict, List, Optional

import folium
import requests
import streamlit as st
from streamlit_folium import st_folium

st.set_page_config(layout="wide")

@st.experimental_singleton
def get_data() -> List[Dict]:
    api_key = st.secrets["api_key"]
    url = f"https://developer.nps.gov/api/v1/parks?api_key={api_key}&limit=500"
    resp = requests.get(url)
    data = resp.json()["data"]
    parks = [park for park in data if park["designation"] == "National Park"]

    for park in parks:
        park["_point"] = Point.from_dict(park)

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Best,
Randy

maverick · June 2, 2022, 1:05pm

thx that’s exactly what i needed