index.js

importScripts("https://cdn.jsdelivr.net/pyodide/v0.24.1/full/pyodide.js");

function sendPatch(patch, buffers, msg_id) {
  self.postMessage({
    type: 'patch',
    patch: patch,
    buffers: buffers
  })
}

async function startApplication() {
  console.log("Loading pyodide!");
  self.postMessage({type: 'status', msg: 'Loading pyodide'})
  self.pyodide = await loadPyodide();
  self.pyodide.globals.set("sendPatch", sendPatch);
  console.log("Loaded!");
  await self.pyodide.loadPackage("micropip");
  const env_spec = ['https://cdn.holoviz.org/panel/wheels/bokeh-3.3.2-py3-none-any.whl', 'https://cdn.holoviz.org/panel/1.3.6/dist/wheels/panel-1.3.6-py3-none-any.whl', 'pyodide-http==0.2.1', 'hvplot', 'pandas']
  for (const pkg of env_spec) {
    let pkg_name;
    if (pkg.endsWith('.whl')) {
      pkg_name = pkg.split('/').slice(-1)[0].split('-')[0]
    } else {
      pkg_name = pkg
    }
    self.postMessage({type: 'status', msg: `Installing ${pkg_name}`})
    try {
      await self.pyodide.runPythonAsync(`
        import micropip
        await micropip.install('${pkg}');
      `);
    } catch(e) {
      console.log(e)
      self.postMessage({
	type: 'status',
	msg: `Error while installing ${pkg_name}`
      });
    }
  }
  console.log("Packages loaded!");
  self.postMessage({type: 'status', msg: 'Executing code'})
  const code = `
  
import asyncio

from panel.io.pyodide import init_doc, write_doc

init_doc()

"""The purpose of this app is to test that a **multi-page Dashboard Layout** similar to the
[bootstrap dashboard template](https://getbootstrap.com/docs/4.3/examples/dashboard/)
from [getboostrap.com](https://getbootstrap.com/) can be implemented in
[Panel](https://panel.pyviz.org/).
"""
import hvplot.pandas  # pylint: disable=unused-import
import pandas as pd
import panel as pn

BOOTSTRAP_DASHBOARD_CHART_URL="https://awesomepanel.blob.core.windows.net/resources/bootstrap_dashboard/bootstrap_dashboard_chart.csv"
BOOTSTRAP_DASHBOARD_TABLE_URL="https://awesomepanel.blob.core.windows.net/resources/bootstrap_dashboard/bootstrap_dashboard_table.csv"

COLOR="#0072B5"

@pn.cache
def _get_chart_data():
    return pd.read_csv(BOOTSTRAP_DASHBOARD_CHART_URL)

@pn.cache
def _get_table_data():
    return pd.read_csv(BOOTSTRAP_DASHBOARD_TABLE_URL)

def _holoviews_chart():
    """## Dashboard Orders Chart generated by HoloViews"""
    data = _get_chart_data()
    line_plot = data.hvplot.line(
        x="Day",
        y="Orders",
        height=500,
        line_color=COLOR,
        line_width=6,
    )
    scatter_plot = data.hvplot.scatter(x="Day", y="Orders", height=300,).opts(
        marker="o",
        size=10,
        color=COLOR,
    )
    fig = line_plot * scatter_plot
    gridstyle = {
        "grid_line_color": "black",
        "grid_line_width": 0.1,
    }
    fig = fig.opts(
        responsive=True,
        toolbar=None,
        yticks=list(
            range(
                12000,
                26000,
                2000,
            )
        ),
        ylim=(
            12000,
            26000,
        ),
        gridstyle=gridstyle,
        show_grid=True,
    )
    return fig

app = pn.extension("tabulator", sizing_mode="stretch_width")

pn.template.FastListTemplate(
    site="Awesome Panel", site_url="https://awesome-panel.org", title="Bootstrap Dashboard",
    main=[
        pn.Column(
            pn.pane.Markdown("## Dashboard"),
            _holoviews_chart()),
            pn.Column(pn.pane.Markdown("## Section Title"),
            pn.widgets.Tabulator(_get_table_data(), layout='fit_data_stretch')),
    ], main_max_width="800px", main_layout=None,
).servable()



await write_doc()
  `

  try {
    const [docs_json, render_items, root_ids] = await self.pyodide.runPythonAsync(code)
    self.postMessage({
      type: 'render',
      docs_json: docs_json,
      render_items: render_items,
      root_ids: root_ids
    })
  } catch(e) {
    const traceback = `${e}`
    const tblines = traceback.split('\n')
    self.postMessage({
      type: 'status',
      msg: tblines[tblines.length-2]
    });
    throw e
  }
}

self.onmessage = async (event) => {
  const msg = event.data
  if (msg.type === 'rendered') {
    self.pyodide.runPythonAsync(`
    from panel.io.state import state
    from panel.io.pyodide import _link_docs_worker

    _link_docs_worker(state.curdoc, sendPatch, setter='js')
    `)
  } else if (msg.type === 'patch') {
    self.pyodide.globals.set('patch', msg.patch)
    self.pyodide.runPythonAsync(`
    state.curdoc.apply_json_patch(patch.to_py(), setter='js')
    `)
    self.postMessage({type: 'idle'})
  } else if (msg.type === 'location') {
    self.pyodide.globals.set('location', msg.location)
    self.pyodide.runPythonAsync(`
    import json
    from panel.io.state import state
    from panel.util import edit_readonly
    if state.location:
        loc_data = json.loads(location)
        with edit_readonly(state.location):
            state.location.param.update({
                k: v for k, v in loc_data.items() if k in state.location.param
            })
    `)
  }
}

startApplication()