freeCodeCamp/curriculum/challenges/chinese-traditional/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-fiel...

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id title challengeType videoUrl forumTopicId dashedName
bad87fee1348bd9aedc08830 給表單添加一個必填字段 0 https://scrimba.com/p/pVMPUv/cMd4EcQ 18360 use-html5-to-require-a-field

--description--

當你設計表單時你可以指定某些字段爲必填項required只有當用戶填寫了該字段後纔可以提交表單。

如果你想把文本輸入框設置爲必填項,在 input 元素中加上 required 屬性就可以了,例如:<input type="text" required>

--instructions--

請給 input 元素加上 required 屬性,這樣用戶就必須先在輸入框裏填入內容,然後纔可以提交表單。

然後嘗試在不輸入任何文本的情況下提交表單, 看看 HTML5 表單是如何通知你這個字段是必填的。

--hints--

input 元素應有 required 屬性。

assert($('input').prop('required'));

--seed--

--seed-contents--

<h2>CatPhotoApp</h2>
<main>
  <p>Click here to view more <a href="#">cat photos</a>.</p>

  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>

  <p>Things cats love:</p>
  <ul>
    <li>cat nip</li>
    <li>laser pointers</li>
    <li>lasagna</li>
  </ul>
  <p>Top 3 things cats hate:</p>
  <ol>
    <li>flea treatment</li>
    <li>thunder</li>
    <li>other cats</li>
  </ol>
  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
    <input type="text" placeholder="cat photo URL">
    <button type="submit">Submit</button>
  </form>
</main>

--solutions--

<h2>CatPhotoApp</h2>
<main>
  <p>Click here to view more <a href="#">cat photos</a>.</p>

  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>

  <p>Things cats love:</p>
  <ul>
    <li>cat nip</li>
    <li>laser pointers</li>
    <li>lasagna</li>
  </ul>
  <p>Top 3 things cats hate:</p>
  <ol>
    <li>flea treatment</li>
    <li>thunder</li>
    <li>other cats</li>
  </ol>
  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
    <input type="text" required placeholder="cat photo URL">
    <button type="submit">Submit</button>
  </form>
</main>