conditional form validation using jquery.validate.js plugin

Question

Can anyone tell me how to write a rule that validates if neither one radio button option nor the (optinal) textfield is chosen/filled by a user? The rule should only give a

Answer 1

The required parameter in jQuery Validate can take a function.

$('#myForm').validate({
    rules: {
        email2: {
            required: function(element) {
                if ($('[name="myradiogroup"]:checked').length) {
                    return false;
                } else {
                    return true;
                }
            }
        },
        myradiogroup: {
            required: function(element) {
                if ($('#email2').val()) {
                    return false;
                } else {
                    return true;
                }
            }
        }
    }
});

---

Here's a condensed version from Sparky

$('#myForm').validate({
    rules: {
        email2: {
            required: function(element) {
                return !$('[name="myradiogroup"]:checked').length;
            }
        },
        myradiogroup: {
            required: function(element) {
                return !$('#email2').val();
            }
        }
    }
});

Answer 2

maybe can this:

$('#myForm').submit(function() {
    if($('input:radio').val() == '' || $('#email2').val() == '') {
        preventDefault();
        // show error
    }
}