https://vandoornbuitenruimte.nl/modules/custom/vandoorn_media/js/vandoorn_media.sort.js?tlv3eq

1/**
2 * @file vandoorn_media.sort.js
3 */
4
5(function ($, Drupal, once) {
6
7  "use strict";
8  Drupal.behaviors.mediaFieldSort = {
9    attach: function (context, settings) {
10      $(once('sortable', '.entity-type--media.sortable tbody')).each(function() {
11        let sort_options = {
12          group: {
13            name: "media",
14            pull: false,
15            put: false
16          },
17          onSort: function(event) {
18            let $form_field = $(this.el).closest('.field--type-entity-reference');
19            let class_list = $form_field.attr('class').split(/\s+/);
20            let field_name = '';
21            $.each(class_list, function(index, item) {
22              if (item.substring(0, 12) == 'field--name-') {
23                field_name = item.substring(12);
24              }
25            });
26            let list = '';
27            $(this.el).find('.rendered-entity').each(function() {
28              list += $(this).attr('data-entity-id') + ' ';
29            });
30            $form_field.find('[data-drupal-selector^="edit-' + field_name + '-target-id"]').val(list);
31          }
32        };
33        Sortable.create(this, sort_options);
34      });
35    }
36  };
37
38})(jQuery, Drupal, once);