https://regmed.ru/local/templates/fgbu/js/index/nav-tiles.js?17902198281450

1(function () {
2  var root = document.querySelector('[data-js-nav-tiles]');
3  if (!root) return;
4
5  var config = {};
6  try { config = JSON.parse(root.getAttribute('data-js-nav-tiles')); } catch (e) {}
7  var perPage = config.perPage || 8;
8
9  var tiles = root.querySelectorAll('.nav-tiles__tile');
10  var total = tiles.length;
11  var totalPages = Math.max(1, Math.ceil(total / perPage));
12
13  var prev = root.querySelector('[data-js-nav-prev]');
14  var next = root.querySelector('[data-js-nav-next]');
15  var counter = root.querySelector('[data-js-nav-counter]');
16  var controls = root.querySelector('.nav-tiles__controls');
17  var current = 0;
18
19  function show(index) {
20    [].forEach.call(tiles, function (t, i) {
21      var page = Math.floor(i / perPage);
22      t.classList.toggle('nav-tiles__tile--hidden', page !== index);
23    });
24    if (prev) prev.classList.toggle('nav-tiles__arrow--disabled', index === 0);
25    if (next) next.classList.toggle('nav-tiles__arrow--disabled', index === totalPages - 1);
26    if (counter) counter.textContent = (index + 1) + ' / ' + totalPages;
27    current = index;
28  }
29
30  if (totalPages <= 1) {
31    show(0);
32    if (controls) controls.classList.add('nav-tiles__controls--hidden');
33    return;
34  }
35
36  if (prev) prev.addEventListener('click', function () { if (current > 0) show(current - 1); });
37  if (next) next.addEventListener('click', function () { if (current < totalPages - 1) show(current + 1); });
38
39  show(0);
40})();