<input type="text"  class="form-control" id="UserLogin" maxlength="32" data-ajax-name="login" data-parsley-remote-options='{ "type": "POST",  "data": { "request":"ajax", "field": "login" } }' data-parsley-errors-messages-disabled="1" data-parsley-remote-validator="validateUsername" data-parsley-remote="1" data-parsley-trigger="focusout" name="data[User][login]" data-parsley-id="2315">            </div>

jQuery('#UserLogin').parsley().addAsyncValidator(
    'validateUsername', function (xhr) {
        var UserLogin = $('#UserLogin').parsley();
        window.ParsleyUI.removeError(UserLogin,'errorUsername');
        if(xhr.status == '200')
            return 200;
        if(xhr.status == '404')
        window.ParsleyUI.addError(UserLogin,'errorUsername',xhr.responseText);
    }, '/User/validationMethod'
);

public function validationMethod()
{
    print ('404');
}