jQuery Validation at least one checkbox is selected

Answer 1

Try

adding this code will do

var chck = $('input[type=checkbox]');
chck.addClass('check-one');
$.validator.addMethod('check-one', function (value) {
    return (chck.filter(':checked').length > 0);
}, 'Check at least one checkbox');

---

fiddle Demo

Group will show error in front first check-box only

var chck = $('input[type=checkbox]');
chck.addClass('check-one');
$.validator.addMethod('check-one', function (value) {
    return (chck.filter(':checked').length > 0);
}, 'Check at least one checkbox');
var chk_names = $.map(chck, function (el, i) {
    return $(el).prop("name");
}).join(" ");
$("#submitDetails").validate({
    groups: {
        checks: chk_names
    },
    submitHandler: function (form) {
        alert('Form Submited');
        return false;
    }
});

---

Remove group if you want error to show in front of all check-boxes

fiddle Demo

$("#submitDetails").validate({
    submitHandler: function (form) {
        alert('Form Submited');
        return false;
    }
});