html5哪个输入字段必填,HTML5：如何使用“required”属性和“radio”输入字段

你只需要为radiogroup的一个输入设置required-attribute，但你可以为所有的输入设置。

例如：

1:

2:

3:

如果你动态生成这些单选按钮，我建议始终添加必需的属性，这样你就不必担心至少有一个输入。

还要注意：

To avoid confusion as to whether a radio button group is required or not,authors are encouraged to specify the attribute on all the radio buttons in a group. Indeed,in general,authors are encouraged to avoid having radio button groups that do not have any initially checked controls in the first place,as this is a state that the user cannot return to,and is therefore generally considered a poor user interface.

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