{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# UI 更新\n",
    "\n",
    "NiceGUI 尝试自动将 UI 元素的状态与客户端同步，例如当标签文本、输入值或元素的样式/类/属性发生更改时。在其他情况下，您可以显式调用` element.update()` 或 `ui.update(*elements)` 进行更新。演示代码展示了针对 `ui.echart` 的两种方法，其中很难自动检测选项字典中的变化。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from nicegui import ui\n",
    "from random import random\n",
    "\n",
    "chart = ui.echart({\n",
    "    'xAxis': {'type': 'value'},\n",
    "    'yAxis': {'type': 'value'},\n",
    "    'series': [{'type': 'line', 'data': [[0, 0], [1, 1]]}],\n",
    "})\n",
    "\n",
    "def add():\n",
    "    chart.options['series'][0]['data'].append([random(), random()])\n",
    "    chart.update()\n",
    "\n",
    "def clear():\n",
    "    chart.options['series'][0]['data'].clear()\n",
    "    ui.update(chart)\n",
    "\n",
    "with ui.row():\n",
    "    ui.button('Add', on_click=add)\n",
    "    ui.button('Clear', on_click=clear)\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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