2018-10-10 22:03:03 +00:00
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---
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id: bad87fee1348bd9aedf08834
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2020-12-16 07:37:30 +00:00
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title: 创建一组单选按钮
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2018-10-10 22:03:03 +00:00
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challengeType: 0
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2019-12-26 12:05:59 +00:00
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videoUrl: 'https://scrimba.com/p/pVMPUv/cNWKvuR'
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forumTopicId: 16822
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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`radio buttons`(单选按钮)就好比单项选择题,正确答案只有一个。
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单选按钮是`input`选择框的一种类型。
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每一个单选按钮都应该嵌套在它自己的`label`(标签)元素中。
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所有关联的单选按钮应该拥有相同的`name`属性。
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2019-12-26 12:05:59 +00:00
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下面是一个单选按钮的例子:
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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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2020-12-16 07:37:30 +00:00
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最佳实践是在`label`元素上设置for属性,让其值与单选按钮的`id`属性值相等,这样就在`label`元素和它的子元素单选按钮之间创建了一种链接关系。例如:
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2019-12-26 12:05:59 +00:00
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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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2020-12-16 07:37:30 +00:00
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# --instructions--
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给表单添加两个单选按钮,一个叫`indoor`,另一个叫`outdoor`,单选按钮的 `name` 为 `indoor-outdoor`。
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# --hints--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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页面上应该有两个单选按钮元素。
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```js
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assert($('input[type="radio"]').length > 1);
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2018-10-10 22:03:03 +00:00
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```
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2020-12-16 07:37:30 +00:00
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设置单选按钮的`name`属性为`indoor-outdoor`。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert($('input[type="radio"]').filter("[name='indoor-outdoor']").length > 1);
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```
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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每一个单选按钮都应该嵌套进它自己的`label`元素中。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert($('label > input[type="radio"]:only-child').length > 1);
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```
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每一个`label`元素都有结束标记。
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```js
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assert(
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code.match(/<\/label>/g) &&
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code.match(/<label/g) &&
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code.match(/<\/label>/g).length === code.match(/<label/g).length
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);
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```
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其中一个`label`元素的文本为`indoor`。
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```js
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assert(
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$('label')
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.text()
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.match(/indoor/gi)
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);
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2018-10-10 22:03:03 +00:00
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```
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2020-12-16 07:37:30 +00:00
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其中一个`label`元素的文本为`outdoor`。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('label')
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.text()
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.match(/outdoor/gi)
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);
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```
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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所有的单选按钮都应该包含在`form`表单中。
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```js
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assert($('label').parent().get(0).tagName.match('FORM'));
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```
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2018-10-10 22:03:03 +00:00
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