{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import panel as pn\n",
    "pn.extension()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The ``Button`` widget allows triggering events when the button is clicked. Unlike other widgets, it does not have a ``value`` parameter. Instead it has a ``clicks`` parameter that can be watched to trigger events.\n",
    "\n",
    "For more information about listening to widget events and laying out widgets refer to the [widgets user guide](../../user_guide/Widgets.ipynb). Alternatively you can learn how to build GUIs by declaring parameters independently of any specific widgets in the [param user guide](../../user_guide/Param.ipynb). To express interactivity entirely using Javascript without the need for a Python server take a look at the [links user guide](../../user_guide/Param.ipynb).\n",
    "\n",
    "#### Parameters:\n",
    "\n",
    "For layout and styling related parameters see the [customization user guide](../../user_guide/Customization.ipynb).\n",
    "\n",
    "##### Core\n",
    "\n",
    "* **``clicks``** (int): Number of clicks (can be listened to)\n",
    "\n",
    "##### Display\n",
    "\n",
    "* **``button_type``** (str): A button theme; should be one of ``'default'`` (white), ``'primary'`` (blue), ``'success'`` (green), ``'info'`` (yellow), or ``'danger'`` (red)\n",
    "* **``disabled``** (boolean): Whether the widget is editable\n",
    "* **``name``** (str): The title of the widget\n",
    "\n",
    "___"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "button = pn.widgets.Button(name='Click me', button_type='primary')\n",
    "button"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The ``clicks`` parameter will report the number of times the button has been pressed:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "button.clicks"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The ``on_click`` method can trigger function when button is clicked:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "text = pn.widgets.TextInput(value='Ready')\n",
    "\n",
    "def b(event):\n",
    "    text.value = 'Clicked {0} times'.format(button.clicks)\n",
    "    \n",
    "button.on_click(b)\n",
    "pn.Row(button, text)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The ``Button`` name string may contain Unicode characters, providing a convenient way to define common graphical buttons:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "backward = pn.widgets.Button(name='\\u25c0', width=50)\n",
    "forward = pn.widgets.Button(name='\\u25b6', width=50)\n",
    "search = pn.widgets.Button(name='🔍', width=100)\n",
    "\n",
    "pn.Row(backward, forward, search)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The color of the button can be set by selecting one of the available button types:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pn.Column(*(pn.widgets.Button(name=p, button_type=p) for p in pn.widgets.Button.param.button_type.objects))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Controls\n",
    "\n",
    "The `Button` widget exposes a number of options which can be changed from both Python and Javascript. Try out the effect of these parameters interactively:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pn.Row(button.controls, button)"
   ]
  }
 ],
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  "language_info": {
   "name": "python",
   "pygments_lexer": "ipython3"
  }
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}
