如何使用 CSS 将选择框扩展到其默认焦点宽度
主题:HTML / CSS
答案:使用 CSS :focus 伪类
默认情况下，<select><option>
下面的例子演示了如何用纯 CSS 实现这个效果:
示例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>增加焦点上的选择框大小</title>
<style>
select {
width: 150px;
margin: 10px;
}
select:focus {
min-width: 150px;
width: auto;
}
</style>
</head>
<body>
<form>
<select>
<option>Choose</option>
<option>This option is large</option>
<option>This option is very large</option>
<option>This option is very very large</option>
<option>This option is very very very large</option>
</select>
</form>
</body>
</html>FAQ 相关问题解答
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