[html] How to use the "required" attribute with a "radio" input field

TL;DR: Set the required attribute for at least one input of the radio group.


Setting required for all inputs is more clear, but not necessary (unless dynamically generating radio-buttons).

To group radio buttons they must all have the same name value. This allows only one to be selected at a time and applies required to the whole group.

_x000D_
_x000D_
<form>_x000D_
  Select Gender:<br>_x000D_
_x000D_
  <label>_x000D_
    <input type="radio" name="gender" value="male" required>_x000D_
    Male_x000D_
  </label><br>_x000D_
_x000D_
  <label>_x000D_
    <input type="radio" name="gender" value="female">_x000D_
    Female_x000D_
  </label><br>_x000D_
_x000D_
  <label>_x000D_
    <input type="radio" name="gender" value="other">_x000D_
    Other_x000D_
  </label><br>_x000D_
_x000D_
  <input type="submit">_x000D_
</form>
_x000D_
_x000D_
_x000D_

Also take note of:

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.

Source

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