POC: fix: make altair and vega work in colab

[maartenbreddels]

This might break classic notebook where requirejs is already available. Proof of concept fix.

The following code on colab works:

import altair as alt
import pandas as pd
from vega_datasets import data

import IPython.display
# make solara use a real cdn, since the solara cdn proxy is not available
display(IPython.display.Javascript("solara_cdn = 'https://cdn.jsdelivr.net/npm/'"))

import solara

# title = "Altair visualization"
source = data.seattle_weather()

selected_datum = solara.reactive(None)

@solara.component
def Page():
    def on_click(datum):
        selected_datum.value = datum

    chart = (
        alt.Chart(source, title="Daily Max Temperatures (C) in Seattle, WA")
        .mark_rect()
        .encode(
            alt.X("date(date):O"),
            alt.Y("month(date):O"),
            alt.Color("max(temp_max)"),
            tooltip=[
                alt.Tooltip("monthdate(date)", title="Date"),
                alt.Tooltip("max(temp_max)", title="Max Temp"),
            ],
        )
        .configure_view(step=13, strokeWidth=0)
        .configure_axis(domain=False)
    )
    with solara.Card("Annual Weather Heatmap for Seattle, WA"):
        solara.AltairChart(chart, on_click=on_click)
        df = source
        if selected_datum.value:
            month_date = selected_datum.value["monthdate_date_end"]
            dt = pd.to_datetime(month_date)
            df = df[(df["date"].dt.month == dt.month) & (df["date"].dt.day == dt.day)]
            solara.Markdown(f"Day of year: {dt.month_name()} - {dt.day}")
            solara.Button("Clear selection", on_click=lambda: selected_datum.set(None))
            solara.display(df)

            with solara.Details("Click data"):
                solara.Markdown(
                    f"""
                Click data:

            {selected_datum.value}
            ```
            """
            )
    else:
        solara.Markdown("Click on the chart to see data for a specific day")

Page()