{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import panel as pn\n",
    "import numpy as np\n",
    "import holoviews as hv\n",
    "\n",
    "pn.extension(sizing_mode=\"stretch_width\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This example demonstrates how to dynamically add and remove plots from a layout (in this case a Column) using the ``pop`` and ``append`` methods (requires a live Python server):"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "slider = pn.widgets.IntSlider(name='N', start=0, end=5)\n",
    "\n",
    "column = pn.Column('This column will be populated with N Plots', sizing_mode=\"stretch_width\")\n",
    "\n",
    "def set_plots(event):\n",
    "    nplots = event.new-event.old\n",
    "    for i in range(abs(nplots)):\n",
    "        if nplots < 0:\n",
    "            column.pop(len(column)-1)\n",
    "        elif nplots > 0:\n",
    "            column.append(hv.Scatter(np.random.randn(1000, 2)).opts(responsive=True, height=300))\n",
    "            \n",
    "    column[0]=f'This column will be populated with {event.new} Plots'\n",
    "    \n",
    "slider.param.watch(set_plots, 'value')\n",
    "slider.value = 1\n",
    "\n",
    "pn.Row(pn.Column(slider, sizing_mode=\"fixed\", width=300), column, sizing_mode=\"stretch_width\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## App\n",
    "\n",
    "Lets wrap it into nice template that can be served via `panel serve dynamic_plot_layout.ipynb`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "description = \"This example demonstrates **how to dynamically add and remove plots** from a layout (in this case a Column) using the ``pop`` and ``append`` methods.\"\n",
    "pn.template.FastListTemplate(site=\"Panel\", title=\"Dynamic Plot Layout\", sidebar=[slider], main=[description, column]).servable();"
   ]
  }
 ],
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  "language_info": {
   "name": "python",
   "pygments_lexer": "ipython3"
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 "nbformat_minor": 4
}