{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "scrolled": false
   },
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "cde00be438e24a568b06c1c3da7f0c7a",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "Map(basemap={'url': 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', 'max_zoom': 19, 'attribution': 'Map …"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "a63e14dd82e94b0eb778ec569fd426fd",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "Label(value='Not Loading')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "from ipyleaflet import *\n",
    "from ipywidgets import *\n",
    "\n",
    "m = Map(center=(52, 10), zoom=8)\n",
    "\n",
    "tl = TileLayer(url='https://{s}.tile.opentopomap.org/{z}/{x}/{y}.png')\n",
    "m.add_layer(tl)\n",
    "\n",
    "label = Label(value='Not Loading')\n",
    "\n",
    "def on_load_change(change):\n",
    "    loading = change['new']\n",
    "    label.value = str('Loading...' if loading else 'Not Loading')\n",
    "\n",
    "tl.observe(on_load_change, 'loading')\n",
    "\n",
    "display(m)\n",
    "display(label)\n",
    "\n",
    "# move the map, zoom out or zoom in to see the Label change from 'Loading...' to 'Not Loading'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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   "file_extension": ".py",
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   "pygments_lexer": "ipython3",
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