2021-05-05 10:13:49 -07:00
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---
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id: bad87fee1348bd9aedf08834
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title: 創建一組單選按鈕
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challengeType: 0
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forumTopicId: 16822
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dashedName: create-a-set-of-radio-buttons
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---
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# --description--
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<dfn>radio buttons</dfn>(單選按鈕)就好比單項選擇題,正確答案只有一個。
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單選按鈕是 `input` 選擇框的一種類型。
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每一個單選按鈕都應該嵌套在它自己的 `label`(標籤)元素中。 這樣,我們相當於給 `input` 元素和包裹它的 `label` 元素建立起了對應關係。
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所有關聯的單選按鈕應該擁有相同的 `name` 屬性。 創建一組單選按鈕,選中其中一個按鈕,其他按鈕即顯示爲未選中,以確保用戶只提供一個答案。
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下面是一個單選按鈕的例子:
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```html
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<label>
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<input type="radio" name="indoor-outdoor">Indoor
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</label>
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```
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最佳實踐是在 `label` 元素上設置 `for` 屬性,讓其值與相關聯的 `input` 單選按鈕的 `id` 屬性值相同。 這使得輔助技術能夠在標籤和相關的 `input` 元素之間建立關聯關係。 例如:
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```html
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<input id="indoor" type="radio" name="indoor-outdoor">
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<label for="indoor">Indoor</label>
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```
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我們也可以在 `label` 標籤中嵌入 `input` 元素:
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```html
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<label for="indoor">
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<input id="indoor" type="radio" name="indoor-outdoor">Indoor
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</label>
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```
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# --instructions--
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在表格中添加一對單選按鈕,每個按鈕嵌套在自己的 `label` 元素中。 一個選項應該是 `indoor` ,另一個選項應該是 `outdoor`。 兩個按鈕的 `name` 屬性都是 `indoor-outdoor`,以創建一組單選按鈕。
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# --hints--
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頁面上應存在兩個 `radio` 按鈕元素。
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```js
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assert($('input[type="radio"]').length > 1);
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```
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應設置單選按鈕的 `name` 屬性值爲 `indoor-outdoor`。
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```js
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assert($('input[type="radio"]').filter("[name='indoor-outdoor']").length > 1);
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```
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每個單選按鈕都應嵌套進它自己的 `label` 元素中。
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```js
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assert($('label > input[type="radio"]:only-child').length > 1);
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```
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每一個 `label` 元素都有結束標籤。
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```js
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assert(
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code.match(/<\/label>/g) &&
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code.match(/<label/g) &&
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code.match(/<\/label>/g).length === code.match(/<label/g).length
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);
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```
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其中一個單選按鈕的文本爲 `indoor`。
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```js
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assert(
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$('label')
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.text()
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.match(/indoor/gi)
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);
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```
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其中一個單選按鈕的文本爲 `outdoor`。
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```js
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assert(
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$('label')
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.text()
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.match(/outdoor/gi)
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);
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```
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所有的單選按鈕都應該包含在 `form` 標籤中。
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```js
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assert($('label').parent().get(0).tagName.match('FORM'));
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```
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# --seed--
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## --seed-contents--
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```html
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<h2>CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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2021-09-22 08:34:59 -07:00
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<a href="#"><img src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt="A cute orange cat lying on its back."></a>
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2021-05-05 10:13:49 -07:00
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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<form action="https://www.freecatphotoapp.com/submit-cat-photo">
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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# --solutions--
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```html
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<h2>CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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2021-09-22 08:34:59 -07:00
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<a href="#"><img src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt="A cute orange cat lying on its back."></a>
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2021-05-05 10:13:49 -07:00
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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<form action="https://www.freecatphotoapp.com/submit-cat-photo">
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<label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
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<label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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