{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# `ui.label`\n",
    "\n",
    "## 标签\n",
    "\n",
    "显示一些文本。\n",
    "\n",
    "- `text`：标签的内容"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<nicegui.elements.label.Label at 0x1ee4f022d10>"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from nicegui import ui\n",
    "\n",
    "ui.label('some label')\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 根据内容改变外观\n",
    "\n",
    "您可以重写 `_handle_text_change` 方法，根据标签的内容来更新其其他属性。这种技术也适用于绑定，如下所示的示例中所示。\n",
    "\n",
    "```python\n",
    "from nicegui import ui\n",
    "\n",
    "class status_label(ui.label):\n",
    "    def _handle_text_change(self, text: str) -> None:\n",
    "        super()._handle_text_change(text)\n",
    "        if text == 'ok':\n",
    "            self.classes(replace='text-positive')\n",
    "        else:\n",
    "            self.classes(replace='text-negative')\n",
    "\n",
    "model = {'status': 'error'}\n",
    "status_label().bind_text_from(model, 'status')\n",
    "ui.switch(on_change=lambda e: model.update(status='ok' if e.value else 'error'))\n",
    "\n",
    "ui.run()\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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