how can i get the polygon?

[B-Snowflake]

trying to get the polygon when click the button, but always get None either draw or not.
this is my code

import geemap
import solara
import ee
from functools import partial

zoom = solara.reactive(4)
center = solara.reactive((40, -100))
bounds = solara.reactive(None)

class GeeMapApp(geemap.Map):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

    def get_last_draw(self, start_date, end_date):
        feature = self.draw_last_feature
        print(feature)
        if feature is not None:
            roi = feature.geometry()
            image = geemap.dynamic_world_s2(roi, start_date, end_date)
            geemap.ee_export_image(image, filename='d:output.tif', region=roi, file_per_band=True)
        else:
            print('draw at least one feature, please')

@solara.component
def Page():
    ee.Initialize()
    with solara.Column(
        style={"min-width": "500px", "height": "780px", "isolation": "isolate"}
    ):
        solara.SliderInt(label="Zoom level", value=zoom, min=1, max=20)
        m = GeeMapApp()
        m.element(
            zoom=zoom.value,
            on_zoom=zoom.set,
            center=center.value,
            on_center=center.set,
            on_bounds=bounds.set,
            scroll_wheel_zoom=True,
            height="600px",
        )
        solara.Button(
            'Click',
            on_click=partial(m.get_last_draw, start_date='2023-11-01', end_date='2024-11-01')
        ) 

how can i fix the code?

[giswqs]

You need to use the m.on_interaction(handle_click) to observe mourse clicking events. See this example:

https://github.com/opengeos/solara-maxar/tree/main

https://github.com/opengeos/solara-maxar/blob/main/pages/01_morocco.py#L213

[B-Snowflake]

is that means i can't get geometry from draw_last_feature,but need to record every point from click event and then uses these points to make a geometry?

[giswqs]

You can get draw features, but you may need to use ipywidget button inside in the map instead of a Solara button outside the map. The map only responds to on_zoom and on_center events outside the map. The get_last_draw method can't pass info back to a Solara component.

[B-Snowflake]

got it,really thank u for such a quick reply,it helps me.
any other examples about ipywidget button inside?

[fekenzofugi]

@B-Snowflake I'm having the same problem. Did you manage to solve it?

[B-Snowflake]

@B-Snowflake I'm having the same problem. Did you manage to solve it?

not yet, in fact, i think i may need take few days or weeks to learn how to use ipywidget.
after that, i'll trying to solve it.