https://socpoist.sk/modules/custom/idsp_base/js/district_toggle.js?tlvlwa

1(function ($, Drupal) {
2  Drupal.behaviors.regionSelected = {
3    attach: function (context, settings) {
4      var $context = $(context);
5      var self = this;
6
7      // $context.find('#edit-region').trigger('change');
8      $context.find('#edit-region').on('change', function() {
9        var $regionSelector = $(this);
10        var link = drupalSettings.idsp_base.regions[$regionSelector.val()];
11
12        if (link && link.length) {
13          window.location.href = link;
14        }
15
16        // self.enableRegionSelect($context, $regionSelector.val());
17        //var $selectList = $context.find("#" + $regionSelector.val() + "_subregion_select");
18      });
19    },
20    hideAll: function(context) {
21      var $context = $(context);
22      $context.find(".form-item-district").addClass('hidden');
23      $context.find(".subregion-select").parent().addClass('hidden');
24    },
25    enableRegionSelect: function(context, region) {
26      var $context = $(context);
27
28      $context.find(".subregion-select").each(function(index) {
29        var $item = $(this);
30        $item.attr('name', $item.attr('id'));
31      });
32
33      $context.find(".subregion-container").addClass("hidden");
34
35      $context.find("#" + region + "_subregions")
36        .removeClass('hidden');
37
38      $context.find("#" + region + "_subregion_select")
39        .attr('name', 'district');
40    }
41  }
42})(jQuery, Drupal);