:checked
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
:checked CSS 伪类选择器表示任何处于选中状态的radio(<input type="radio">), checkbox (<input type="checkbox">) 或 ("select") 元素中的option HTML 元素 ("option")。
css
/* 匹配任意被勾选/选中的 radio(单选按钮),checkbox(复选框),或者 option(select 中的一项) */
:checked {
margin-left: 25px;
border: 1px solid blue;
}
用户通过勾选/选中元素或取消勾选/取消选中，来改变该元素的 :checked 状态。
备注：因为浏览器经常将 <option> 视为可替换元素，因此不同的浏览器通过:checked伪类渲染出来的效果也不尽相同。
语法
css
:checked {
/* CSS declarations */
}
示例
基础示例
HTML
html
<div>
<input type="radio" name="my-input" id="yes" />
<label for="yes">Yes</label>
<input type="radio" name="my-input" id="no" />
<label for="no">No</label>
</div>
<div>
<input type="checkbox" name="my-checkbox" id="opt-in" />
<label for="opt-in">Check me!</label>
</div>
<select name="my-select" id="fruit">
<option value="opt1">Apples</option>
<option value="opt2">Grapes</option>
<option value="opt3">Pears</option>
</select>
CSS
css
div,
select {
margin: 8px;
}
/* Labels for checked inputs */
input:checked + label {
color: red;
}
/* Radio element, when checked */
input[type="radio"]:checked {
box-shadow: 0 0 0 3px orange;
}
/* Checkbox element, when checked */
input[type="checkbox"]:checked {
box-shadow: 0 0 0 3px hotpink;
}
/* Option elements, when selected */
option:checked {
box-shadow: 0 0 0 3px lime;
color: red;
}
结果
借用隐藏的 checkbox 来切换元素的样式（显示/隐藏）
这个例子利用了:checked伪类，让用户基于复选框的状态切换内容，而无需使用 JavaScript。
HTML
html
<input type="checkbox" id="expand-toggle" />
<table>
<thead>
<tr>
<th>Column #1</th>
<th>Column #2</th>
<th>Column #3</th>
</tr>
</thead>
<tbody>
<tr class="expandable">
<td>[more text]</td>
<td>[more text]</td>
<td>[more text]</td>
</tr>
<tr>
<td>[cell text]</td>
<td>[cell text]</td>
<td>[cell text]</td>
</tr>
<tr>
<td>[cell text]</td>
<td>[cell text]</td>
<td>[cell text]</td>
</tr>
<tr class="expandable">
<td>[more text]</td>
<td>[more text]</td>
<td>[more text]</td>
</tr>
<tr class="expandable">
<td>[more text]</td>
<td>[more text]</td>
<td>[more text]</td>
</tr>
</tbody>
</table>
<label for="expand-toggle" id="expand-btn">Toggle hidden rows</label>
CSS
css
/* Hide the toggle checkbox */
#expand-toggle {
display: none;
}
/* Hide expandable content by default */
.expandable {
visibility: collapse;
background: #ddd;
}
/* Style the button */
#expand-btn {
display: inline-block;
margin-top: 12px;
padding: 5px 11px;
background-color: #ff7;
border: 1px solid;
border-radius: 3px;
}
/* Show hidden content when the checkbox is checked */
#expand-toggle:checked ~ * .expandable {
visibility: visible;
}
/* Style the button when the checkbox is checked */
#expand-toggle:checked ~ #expand-btn {
background-color: #ccc;
}
结果
规范
| Specification |
|---|
| HTML # selector-checked |
| Selectors Level 4 # checked-pseudo |
浏览器兼容性
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