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', '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()

"""
Source: https://awesome-panel.org/resources/table_of_elements_with_wikipedia_row_content/
"""

import panel as pn
from bokeh.sampledata.periodic_table import elements

pn.extension("tabulator")

@pn.cache
def get_elements():
    return elements[
        ["atomic number", "name", "atomic mass", "metal", "year discovered"]
    ].set_index("atomic number")

periodic_df = get_elements()

@pn.cache # Caching is a hack to avoid flickering. It seems like row content is loaded twice otherwise
def content_fn(row):
    return pn.pane.HTML(
        f'<iframe src="https://en.wikipedia.org/wiki/{row["name"]}" width="100%" height="500px"></iframe>',
        sizing_mode="stretch_width"
    )

periodic_table = pn.widgets.Tabulator(
    periodic_df,
    layout="fit_columns",
    sizing_mode="stretch_both",
    row_content=content_fn,
    embed_content=True,
)

pn.template.FastListTemplate(
    site="Awesome Panel",
    site_url="https://awesome-panel.org",
    title="Table of Elements with Wikipedia row content",
    main=[periodic_table],
    accent="#F08080",
    main_layout=None,
    main_max_width="1024px",
).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()