{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 运行 JavaScript\n",
    "\n",
    "此函数在浏览器中执行页面上的任意 JavaScript 代码。在该函数被调用之前，客户端必须连接。要通过 ID 访问客户端对象，请使用 JavaScript 函数 `getElement()`。\n",
    "\n",
    "如果等待该函数，将返回 JavaScript 代码的结果。否则，将执行 JavaScript 代码，无需等待响应。\n",
    "\n",
    "参数：\n",
    "- `code`: 要运行的 JavaScript 代码\n",
    "- `timeout`: 超时时间（秒）（默认值：`1.0`）\n",
    "- `check_interval`: 检查响应的时间间隔（秒）（默认值：`0.01`）\n",
    "- 返回值：可等待的 `AwaitableResponse`，可以等待以获取 JavaScript 代码的结果"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from nicegui import ui\n",
    "\n",
    "def alert():\n",
    "    ui.run_javascript('alert(\"Hello!\")')\n",
    "\n",
    "async def get_date():\n",
    "    time = await ui.run_javascript('Date()')\n",
    "    ui.notify(f'Browser time: {time}')\n",
    "\n",
    "def access_elements():\n",
    "    ui.run_javascript(f'getElement({label.id}).innerText += \" Hello!\"')\n",
    "\n",
    "ui.button('fire and forget', on_click=alert)\n",
    "ui.button('receive result', on_click=get_date)\n",
    "ui.button('access elements', on_click=access_elements)\n",
    "label = ui.label()\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 运行异步 JavaScript\n",
    "\n",
    "使用 `run_javascript`，您还可以在浏览器中运行异步代码。以下演示展示了如何获取用户的当前位置。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<nicegui.elements.button.Button at 0x24ef8aec590>"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from nicegui import ui\n",
    "\n",
    "async def show_location():\n",
    "    response = await ui.run_javascript('''\n",
    "        return await new Promise((resolve, reject) => {\n",
    "            if (!navigator.geolocation) {\n",
    "                reject(new Error('Geolocation is not supported by your browser'));\n",
    "            } else {\n",
    "                navigator.geolocation.getCurrentPosition(\n",
    "                    (position) => {\n",
    "                        resolve({\n",
    "                            latitude: position.coords.latitude,\n",
    "                            longitude: position.coords.longitude,\n",
    "                        });\n",
    "                    },\n",
    "                    () => {\n",
    "                        reject(new Error('Unable to retrieve your location'));\n",
    "                    }\n",
    "                );\n",
    "            }\n",
    "        });\n",
    "    ''', timeout=5.0)\n",
    "    ui.notify(f'Your location is {response[\"latitude\"]}, {response[\"longitude\"]}')\n",
    "\n",
    "ui.button('Show location', on_click=show_location)\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "py311",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.11.7"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}