---
tags: JS 直播班 - 2022 秋季班
---
# 🏅 Day 38 - data-* 屬性應用

可以在 HTML 標籤自訂 data-* 屬性，寫法：`data-自訂名稱="值"`

<p data-task="daily">每日任務</p>

### 應用

`data-*` 屬性可以像其他屬性一樣使用 `.getAttribute` 取得屬性值：

HTML

<p class="title" data-content="文字">data-* 屬性</p>

JS

const title = document.querySelector('.title');
console.log(title.getAttribute('data-content')); 

除了 `.getAttribute` 以外， `data-*` 也可以用 `document.querySelector` 選取，例如：

HTML

<p class="alertMsg" data-title="信箱"></p>
<p class="alertMsg" data-title="密碼"></p>

取得「data-title="信箱"」p 標籤的方式有兩種：

JS

// 1 取得所有 data-title 選擇第0項
document.querySelectorAll('[data-title]')[0];

// 2 直接輸入完整的資料選取
document.querySelector("[data-title='信箱']");

另外，也可以透過事件綁定來取得 `data-*`，例如：

HTML

<p class="alertMsg" data-title="信箱">點我會顯示 dataset</p>

JS

const alertMsg = document.querySelector('.alertMsg');
alertMsg.addEventListener('click', function(e) {
  console.log(e.target.dataset.title);
})

問題
---
請使用 [這個 CodePen](https://codepen.io/hexschool/pen/RwJpwGY?editors=1011) 做練習，當點擊「加入 alert 文字」按鈕後，將會在對應的
`<p class="alertMsg"></p>` 標籤中填入警示文字，HTML 畫面渲染如下圖：


> 注意，「信箱 必填」的「信箱」、「密碼 必填」的「密碼」需取用 data-title 的內容。

## 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：

const addBtn = document.querySelector('.addBtn');
const alertMsgAll = document.querySelectorAll('[data-title]');

addBtn.addEventListener('click', addAlertMsg);
function addAlertMsg() {
alertMsgAll.forEach(function(item) {
item.textContent = `${item.dataset.title} 必填!`;
})
}
-->

回報區
---

| Discord | CodePen / 答案 |
|:---------------------:|:---------------------------------------------------------------------------:|
| 柔柔#1716 | [Codepen](https://codepen.io/rouchen/pen/QWxmLLZ?editors=1011) |
| 威0#6919 | [codepen](https://codepen.io/n0918679182/pen/XWYErbW?editors=1011) |
| 薯餅#3581 | [codepen](https://codepen.io/ColdingPoTaTo/pen/mdKxbeB) |
| albee#9121 | [Codepen](https://codepen.io/albee-chang/pen/dyKmbYN?editors=1011) |
| jacky010080#0880 | [CodePen](https://codepen.io/Yen-Jung-Chen/pen/QWxmLgo?editors=1011) |
| yumy#1940 | [CodePen](https://codepen.io/yumyyang/pen/WNyzewY) |
| YC#2522 | [CodePen](https://codepen.io/YCLu/pen/dyKmbbO) |
| Clara#1275 | [CodePen](https://codepen.io/bsupixqu/pen/XWYEraX?editors=1111) |
| 無名#6427 | [CodePen](https://codepen.io/Nomoney/pen/zYaWOrG) |
| shinyhung#3825 | [CodePen](https://codepen.io/sean_1215/pen/oNyqvjY?editors=1011) |
| kenki100#0068 | [Codepen](https://codepen.io/ken100/pen/XWYErmW) |
| 大衛#4869 | [CodePen](https://codepen.io/exnsrpjc/pen/gOKeYPv?editors=1010) |
| 楓之聲#6945 | [Codepen](https://codepen.io/sshane258/pen/poKLzOo) |
| AuroraC#6539 | [codepen](https://codepen.io/AuroraC/pen/gOKeYOX?editors=1111) |
| Data#9297 | [Codepen](https://codepen.io/kirakira72/pen/zYaWOzr) |
| jimmyFang#9575 | [Codepen](https://codepen.io/pohxiqqo/pen/eYKMOXz?editors=1010) |
| m_m#5493 | [CodePen](https://codepen.io/minnn7716/pen/ZERxzPW) |
| Peng#9811 | [CodePen](https://codepen.io/peng-027/pen/RwJMbqJ) |
| 軟綿綿 (๑•ᴗ•๑) ♡#3627 | [CodePen](https://codepen.io/Connie-Chien/pen/wvXmvdB?editors=0010) |
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| 法希娜#3206 | [CodePen](https://codepen.io/yiiserpf-the-encoder/pen/WNyzNjr?editors=1111) |
| 圈圈#4060 | [codepen](https://codepen.io/wjejcfzn-the-bold/pen/ZERxzJY) |
| LHchien33#6232 | [codepen](https://codepen.io/lin_chien/pen/YzvaKmj) |
| Potatolee#7749 | [codepen](https://codepen.io/potatoleee/pen/QWxmWrK?editors=1011) |
| Kimi #9564 | [CodePen](https://codepen.io/kimihu91/pen/mdKpjNE) |
| amy芳#1385 | [CodePen](https://codepen.io/amy-chieng/pen/NWzYPpv) |
| Benson#6763 | [Codepen](https://codepen.io/kumashow/pen/RwJMwzw) |
| Hilda#7085 | [Codepen](https://codepen.io/vwquikad-the-vuer/pen/RwJMNrP) |
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| Loran#1105 | [Codepen](https://codepen.io/loranlin/pen/PoaRwaj) |
| mandylai#4055 | [Codepen](https://codepen.io/mandy-lai-2/pen/ZERxYXq) |
| William Lai#0196 | [Codepen](https://codepen.io/lai-weihan/pen/ExREjxa?editors=1011) |
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| PayRoom#8328 | [CodePen](https://codepen.io/water38198/pen/mdKxJWp) |
| RJRS#9430 | [CodePen](https://codepen.io/RJRS/pen/qBKodRq) |
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| masterYan#2480 | [CodePen](https://codepen.io/htzwgoqt-the-looper/pen/BaVrNOv?editors=1011) |
| JackC#0411 | [CodePen](https://codepen.io/key0329/pen/gOKeabq) |
| 肉桂卷#0625 | [CodePen](https://codepen.io/ginnlee/pen/QWxmbeW?editors=1011) |
| Ruby Chen#7452 | [CodePen](https://codepen.io/ruby92429/pen/gOKepQB?editors=1111) |
| banazita#5143 | [CodePen](https://codepen.io/banazita/pen/LYrdPPZ) |
| WEI_RIO#9342 | [Codepen](https://codepen.io/wei_wu/pen/rNKdOzz?editors=1111) |
| Rr#2215 | [Codepen](https://codepen.io/rufangcheng/pen/gOKerbX) |
| 亞芽#1185 | [Codepen](https://codepen.io/sanahsu/pen/GRGxoRp?editors=1011)|
|beta lin#1445|[CodePen](https://codepen.io/linbeta/pen/WNyzwbg)|
|Mylène#2481|[Codepen](https://codepen.io/hamajibashi/pen/JjZLKrv)|
| Hironaka#7367 | [Codepen](https://codepen.io/Hironaka0815/pen/oNyqLeP?editors=1011) |
|SASIMI#5099|[Codepen](https://codepen.io/sashimi1327/pen/poKLbqw)|
|Amberhh#2465| [Codepen](https://codepen.io/Amberhh/pen/dyKmbad) |
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