magento : frontend form validation multiple input radio

Question

How can I make sure with magento form validation that one of the multiple input radio is selected ?

Is there a magento way to achieve that or I should do it using prototype/jquery ?

Answer 1

You need to use validate-one-required-by-name in the class name of the radio button.

Eg : <input type='radio' class="validate-one-required-by-name"/>

Or

use validate-one-required on the last radio in the group.