html5:复选框/收音机中名为 required 的属性的意义 [英] html5: Significance of attribute named required in checkbox/radio
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问题描述
在提交表单时，您怎么可能将复选框/单选按钮标记为必需?
On form submission, how could you possibly mark a checkbox/radiobutton as required?
推荐答案
必填复选框并不少见.几乎每个注册表单都使用某种形式的我已阅读并接受用户协议"复选框.
Required checkboxes are not unusual. Practically every registration form uses some form of the "I have read and accept the User Agreement" checkbox.
如果你有 Opera，试试下面的代码.除非选中复选框，否则表单不会提交.
If you have Opera handy try out the code below. The form won't submit unless the checkbox is checked.
<!doctype html>
<html>
<head>
<title>html5</title>
</head>
<body>
<h1>html5 test</h1>
<form action="/">
<input type="checkbox" required="required" id="cb" name="cb">
<label for="cb">required checkbox</label>
<input type="submit">
</form>
</body>
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