---
tags: 2022 React 新手讀書會
---
# 🏅 Day 4｜React Hook - useState 進階練習
繼續昨天的 useState 練習，今天要練習的是物件資料，這樣的用法很常被用在 input 練習上，先來看個範例。
舉例來說：

const [userData, setUserData] = React.useState({
  account: '',
  password: '',
})

---
那在 input 上就會這樣綁定資料。

<input name="account" value={userData.account} onChange={handleChange} />

- name 為設定和 userData 資料內定義相同的物件 key 值。
- value 為動態綁定 userData 的 account 值。
- onChange 事件動態綁定 handleChange 函式。
---
因為表單中會有多個 input，所以我們可以透過函式取得 event 參數來統一更新資料的行為，例如：

const handleChange = (e) => {
  const { name, value } = e.target;
  setUserData((state) => ({...state, [name]:value}))
}

因為使用 `setUserData` 會直接更新 `userData` 資料，所以運用在多個 input 的整合來說，我們需要保持其他資料的內容，只更新我們要更新的對象。

因此透過函式參數的 `state` 先將原始資料取出，再透過物件展開 `...state` 將物件中的原始資料加入，最後的 `[name]:value` 則更新對應的 key 和值。

回到 input 元素來看，就是更新 `userData` 中的 `account`，而 value 是 `e.target.value` 也就是輸入的值。

[文件參考](https://zh-hant.reactjs.org/docs/forms.html#handling-multiple-inputs)

## 題目
請複製 （右下角 fork）這個[範例](https://codepen.io/hexschool/pen/OJvjNqZ)，並撰寫內容，完成帳號密碼的表單製作，並在點選送出按鈕後，可以在 console 看到輸入的值。

## 回報流程
將答案寫在 CodePen 並複製 CodePen 連結貼至底下回報就算完成了喔!
解答位置請參考下圖（需打開程式碼的部分觀看）

<!-- 解答：
input

<div>
  <label htmlFor="account">帳號</label>
  <input id="account" name="account" value={userData.account} onChange={handleChange} />
</div>
<div>
  <label htmlFor="password">密碼</label>
  <input id="password" name="password" value={userData.password} onChange={handleChange} />
</div>

state 和 handleChange 函式

const [userData, setUserData] = React.useState({
  account: '',
  password: '',
});
const handleChange = (e) => {
  const { name, value } = e.target;
  setUserData((state) => ({...state, [name]:value}))
}

-->

回報區
---

| Discord | CodePen / 答案 |
|:-----------------------:|:------------------------------------------------------------------------:|
| Rice #8043 | [CodePen](https://codepen.io/riecball/pen/yLKoqPy?editors=1011) |
| Joechiboo #3960 | [CodePen](https://codepen.io/joe-chiboo/pen/MWVVmpe) |
| ねこ*#9385 | [Codepan](https://codepen.io/kunpao0104/pen/ExEEmvv) |
| yunyun#5215 | [Codepan](https://codepen.io/yun_yunni/pen/BarrRYX) |
| DIANAxAKKO#4298 | [Codepen](https://codepen.io/redfire29/pen/dymmWeq?editors=1010) |
| LEO#7779 | [Codepen](https://codepen.io/nekorice/pen/RwMMVjE) |
| 魚魚#0937 | [Codepen](https://codepen.io/fish0522/pen/dymmWJj) |
| 黃士桓#7654 | [codePen](https://codepen.io/shr-huan-huang/pen/gOeeWKJ) |
| Kimi#2092 | [codePen](https://codepen.io/a3216lucy/pen/MWVVmXJ) |
| 布魯諾#7239 | [codePen](https://codepen.io/bruno-yu/pen/xxWWdjY?editors=1011) |
| lloydd#8224 | [Codepen](https://codepen.io/thanatus25/pen/xxWWdez) |
| Bumble幫啵#0255 | [Codepen](https://codepen.io/lmpzezvw-the-lessful/pen/QWmmvxy) |
| YenYing#4029 | [Codepen](https://codepen.io/yenying0804/pen/eYMMWaG?editors=1011) |
| 棒腿#9350 | [CodePen](https://codepen.io/frankHsu/pen/MWVVmdo?editors=1011) |
| 葉秋#2335 | [CodePen](https://codepen.io/as880074/pen/eYMMWPR?editors=1111) |
| ZengZeng | [Codepen](https://codepen.io/tyzyoko/pen/XWEEgWE) |
| SHIN#6075 | [Codepen](https://codepen.io/shin9626/pen/qBoojWJ) |
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| 𝓛𝓊𝒸𝓎#8635 | [Codepen](https://codepen.io/lucygirl/pen/gOeeRPp) |
| 威爾#1694 | [CodePen](https://codepen.io/WILL_Wu/pen/VwXXWPo) |
| 吉利#3810 | [codepen](https://codepen.io/gillianyy/pen/zYWWzEm?editors=1111) |
| Evonne#7078 | [codepen](https://codepen.io/Hsu1Fang/pen/RwMMgpN?editors=0011) |
| Ada | [codepen](https://codepen.io/zggsoagv-the-scripter/pen/poLLwyr) |
| Paper#1658 | [CodePen](https://codepen.io/paper_hsiao/pen/eYMMRqx) |
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| hiYifang #0736 | [Codepen](https://codepen.io/hiYifang/pen/LYddraJ) |
| JC#8658 | [Codepen](https://codepen.io/jcsamoyed/pen/VwXXVRL) |
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| Yiling#4054 | [Codepen](https://codepen.io/lin010/pen/zYWWymv?editors=1011) |
| Evileye#0666 | [Codepen](https://codepen.io/gn-lin/pen/wvmmQqz?editors=1111) |
| Anson#3594 | [Codepen](https://codepen.io/huanmingchang/pen/poLLXLd?editors=0002) |
| Eric Su#7798 | [Codepen](https://codepen.io/wc-su/pen/GRxxVLx) |
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| MarsKuo#6015 | [Codepen](https://codepen.io/MarsKuo/pen/wvmjKEg) |
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| 山貓(焜)#7041 | [CodePen](https://codepen.io/pen?template=dymmVaQ) |
| niel#2413 | [Codepen](https://codepen.io/danielhsu/pen/jOzxMgR?editors=0011) |
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| 陳sam#9117 | [Codepen](https://codepen.io/euldpliv/pen/xxWjgGj?editors=1111) |
| JessSong#5050 | [Codepen](https://codepen.io/jssanji03/pen/oNqqQZO) |
| GL#2256 | [Codepen](https://codepen.io/4genie/pen/poLVRpr) |
| yoshidc#0455 | [Codepen](https://codepen.io/yoshiyyc/pen/QWmmeQZ) |
| Robert Lo#9653 | [Codepen](https://codepen.io/Robert-Lo/pen/LYdmxEJ?editors=1111) |
| moitw | [codepen](https://codepen.io/tsuifei/pen/KKoRWwo?editors=1011) |
| Carolkiki2003 #7399 | [codepen](https://codepen.io/wasfzuig/pen/gOeeGey) |
|huch09#1426 | [codepen](https://codepen.io/subarashii-huch09/pen/WNzJdxd?editors=0011) |
| Alex Liao#8538 | [CodePen](https://codepen.io/alex0207s/pen/eYMrygx) |
| NinaKuo#3332 |[Codepen](https://codepen.io/ninakuo0814/pen/RwMyMNd)|
| john21429#9434 |[Codepen](https://codepen.io/john21429/pen/NWYMBGG?editors=1111)|
| 連小艾#0791 | [Codepen](https://codepen.io/bolaslien/pen/ZExojyX?editors=0011) |
|kevinhes#2881|[CodePen](https://codepen.io/kevinhes/pen/xxWjBZW?editors=0011)|
|yiwun#0953|[Codepen](https://codepen.io/kagamiakira_IBUN/pen/dymePXG?editors=1111)|
|Kelvin#3296|[Codepen](https://codepen.io/kelvinchang/pen/xxWjepK)|
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|anby#7112|[Codepen](https://codepen.io/andy-ch-bo-an/pen/xxWzxrz?editors=1011)|
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| Shani#4593 |[Codepen](https://codepen.io/ShaniMa/pen/abYKpOL)|
| Emily Hsi #9066 |[Codepen](https://codepen.io/EmilyHsi/pen/bGvKgWd)|
| BEAN #8402 |[Codepen](https://codepen.io/Beanhuang/pen/JjLZPay?editors=0011)|
| james#1443 |[Codepen](https://codepen.io/clothn0105700/pen/ZExReJq?editors=1111)|
|小白兔|[codepan](https://codepen.io/wei-nie/pen/BarVWrd?editors=0011)|
|TedWang|[codepan](https://codepen.io/wangtaiyan/pen/XWEYaJP?editors=1011)|
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