pyviz/pyviz Gitter example of potential issue.

programmatically-select-grid.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import holoviews as hv\n",
    "import panel as pn\n",
    "import param\n",
    "from holoviews import opts\n",
    "from bokeh.sampledata.iris import flowers\n",
    "from holoviews.operation import gridmatrix\n",
    "from holoviews.streams import Selection1D, Stream\n",
    "\n",
    "hv.extension('bokeh')\n",
    "\n",
    "print('holoviews: ', hv.__version__)\n",
    "print('panel:     ', pn.__version__)\n",
    "print('param:     ', param.__version__)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "iris_ds = hv.Dataset(flowers, kdims=['sepal_length','sepal_width','petal_length','petal_width'])\n",
    "iris_ds.dframe().head(3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "grid = gridmatrix(iris_ds, diagonal_type=hv.Distribution, chart_type=hv.Points).opts(\n",
    "    opts.GridMatrix(shared_datasource=True, merge_tools=True),\n",
    "    opts.Points(tools=['hover', 'box_select', 'lasso_select', 'tap'], active_tools=['box_select'],\n",
    "                shared_datasource=True),\n",
    "    opts.Distribution(shared_datasource=False, shared_axes=False))\n",
    "\n",
    "table = hv.Table(iris_ds, kdims=['sepal_length','sepal_width','petal_length','petal_width']).opts(\n",
    "    selectable=True, toolbar=None, shared_datasource=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "select_table = Stream.define('Selected', selected=[])()\n",
    "table_selected = Selection1D(source=table)\n",
    "\n",
    "@param.depends(index=table_selected.param.index)\n",
    "def reactive_grid(index):\n",
    "    if len(index) != 0: \n",
    "        return grid.apply.opts(selected=index)\n",
    "    else:\n",
    "        return grid\n",
    "    \n",
    "@param.depends(selected=select_table.param.selected)\n",
    "def reactive_table(selected):\n",
    "    table_selected.update(index=selected)\n",
    "    return table.apply.opts(selected=selected)\n",
    "\n",
    "pn.Column(reactive_grid, reactive_table)"
   ]
  }
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