Mark

function checkUnique(fieldName) {

            $('input[name="'+fieldName+'"]').on('blur', function (event) {
                event.preventDefault();

                var element = $(this);

                if (element.val() !== "") {
                    let Ajax = $.ajax({
                        url: '/api/v1.0/users/unique',
                        method: 'GET',
                        data: {'field': element.attr('name'), 'value': element.val()},
                        dataType: 'JSON'
                    })
                        .done((function (data) {
                            if (data.result == 0) {
                                $('.validator_' + element.attr('name')).empty().html('<i class="icon remove red"></i> ' +
element.attr('name') + ' is already exists!');
                                $('.btn-register-form-submit').addClass('disabled');
                            } else {
                                $('.validator_' + element.attr('name')).empty().html('<i class="icon check green"></i>');
                                $('.btn-register-form-submit').removeClass('disabled');
                            }
                        }))
                }
            });
        }

        checkUnique('email');
        checkUnique('name');