https://www.fotoaparat.cz/frontend/js/page/module.registration.js?v=1.0

1$().ready(function () {
2    'use strict';
3
4    // Registration ===============================================================
5    (function () {
6        var $form = $('#frm-registration-form');
7        var $nick = $form.find('#frm-registration-form-nick');
8        var $nickSnippet = $('#snippet-registration-nick');
9        var $email = $form.find('#frm-registration-form-email');
10        var $emailSnippet = $('#snippet-registration-email');
11
12        $nick.on('blur', function () {
13            if ($(this).val().length > 0) {
14                $.nette.ajax({
15                    url: $(this).data('validation'),
16                    data: {'registration-nick': $(this).val()},
17                    success: function () {
18                    }
19                });
20            }
21        });
22        $nick.on('keyup', function () {
23            $(this).val().length <= 0 ? $nickSnippet.slideUp() : $nickSnippet.slideDown();
24        });
25        $email.on('blur', function () {
26            if ($(this).val().length > 0) {
27                $.nette.ajax({
28                    url: $(this).data('validation'),
29                    data: {'registration-email': $(this).val()},
30                    success: function () {
31                    }
32                });
33            }
34        });
35        $email.on('change', function () {
36            $(this).val().length <= 0 ? $emailSnippet.slideUp() : $emailSnippet.slideDown();
37        });
38    })();
39});