https://www.bibus.fr/modules/ratpdev/atix_filelist/js/atix_filelist.js?tlghv4

1(function ($, Drupal, once) {
2  Drupal.behaviors.atix_filelist = {
3    attach: function (context) {
4      once('filelistBehavior', '.filelist-select', context).forEach(function (element) {
5        var selectDest = $(element);
6        var src = selectDest.data('selectChained');
7        if (src) {
8          //Chain selects
9          selectDest.chained(src);
10          var selectSrc = $(src);
11
12          if (1 === $("option", selectDest).length || selectSrc.val() === "") {
13            selectDest.closest('.js-form-item').hide();
14          }
15          selectSrc.change(function () {
16            var Opts = $("option", selectDest);
17            if (1 === Opts.length) {
18              selectDest.closest('.js-form-item').hide();
19            } else {
20              selectDest.closest('.js-form-item').show();
21              // Prérenseigne la valeur unique
22              if (2 === Opts.length) {
23                selectDest.val(Opts.last().val()).change();
24              }
25            }
26          });
27        }
28        selectDest.change(function () {
29          if (1 !== $("option", selectDest).length) {
30            var file = selectDest.find(':selected').data('file');
31            let fileButton = $(this).closest('.form-atix-filelist').find('.filelist-button');
32            if (file) {
33              fileButton.attr('data-url', file)
34              fileButton.show();
35            } else {
36              fileButton.hide();
37            }
38          }
39        });
40        selectDest.change();
41      });
42
43      $('.filelist-button').click(function () {
44        window.open($(this).attr('data-url'));
45        return false;
46      });
47    }
48  };
49})(jQuery, Drupal, once);