jQuery Validate - at least one from a group of checkboxes is checked only if a radio button is checked

Question

I´m using jquery validate plugin to ensure at least one from a group of three checkboxes is checked and it´s woking fine. But I want validate these checkboxes only if the ra

Answer 1

You could try the built-in functionality:

$( "#itemForm" ).validate({
  rules: {
    opt01: {
      required: "#resp01-sim"
    }
  }
});

http://jqueryvalidation.org/required-method/#example:-makes-details-required-only-if-#other-is-checked

Answer 2

You simply need to alter the logic of your custom method.

$.validator.addMethod('require-one', function(value) {
    if ($('#resp01-sim').is(':checked')) {
        return $('.require-one:checked').size() > 0;
    } else {
        return true;
    }
}, 'Selecione pelo menos uma das opções.');

DEMO: http://jsfiddle.net/TnmGr/4/