https://www.jcdecaux.com/modules/custom/jcdecaux_common/js/download_panel.js?v=10.4.5

1/**
2 * @file
3 */
4
5Drupal.behaviors.download_panel = function ($, Drupal) {
6  'use strict';
7  var download_url = Drupal.url('listing/download/document/'),
8    selectedIds = {},
9    totalSize = 0,
10    addItem = function (item) {
11      selectedIds[item.id] = item.id.toString(36);
12      totalSize = totalSize + parseInt(item.size, 10);
13    },
14    removeItem = function (item) {
15      delete selectedIds[item.id];
16      if (Object.keys(selectedIds).length) {
17        totalSize = totalSize - parseInt(item.size, 10);
18      }
19      else {
20        totalSize = 0;
21      }
22    },
23    getPanel = function () {
24      var $panel = null;
25      return function () {
26        if (!$panel) {
27          $panel = $('.mass-download.info-block');
28        }
29        return $panel;
30      };
31    }(),
32    formatBytes = function (a, b) {
33      var i, c = 1024, d = b || 2, f = 0, s = [], e = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
34      for (i = 0; i < e.length; i = i + 1) {
35        s[i] = '@file_size' + e[i];
36      }
37      if (a > 0) {
38        f = Math.floor(Math.log(a) / Math.log(c));
39        a = parseFloat((a / Math.pow(c, f)).toFixed(d));
40      }
41      return Drupal.t(s[f], {'@file_size' : a});
42    },
43    updatePanel = function () {
44      var $p = getPanel(), $link,
45        selected_number = Object.keys(selectedIds).length;
46      if (selected_number) {
47        $p.find('div.quantity').text(Drupal.formatPlural(selected_number, '1 item selected', '@count items selected'));
48        $link = $p.find('div.container a.cta-button');
49        $link.text(Drupal.t('Download (@size)', { '@size': formatBytes(totalSize, 1) }));
50        $link.attr('href', download_url + Object.keys(selectedIds).map(function (itm) { return selectedIds[itm]; }).join(','));
51        if (!$p.is(':visible')) {
52          $p.fadeIn('slow');
53        }
54      }
55      else {
56        if ($p.is(':visible')) {
57          $p.fadeOut();
58        }
59      }
60    },
61    resetPanel = function () {
62      selectedIds = {};
63      totalSize = 0;
64      updatePanel();
65    };
66
67  return {
68    attach: function (context) {
69      $(once('massDownload', '.download-checkbox [type="checkbox"]', context)).each(function () {
70        $(this).click(function () {
71          var $this = $(this);
72          if ($this.prop('checked')) {
73            addItem($this.data());
74          }
75          else {
76            removeItem($this.data());
77          }
78          updatePanel();
79        });
80      });
81      $(once('massDownload', '.views-exposed-form .form-actions input[type="submit"]', context)).each(function () {
82        $(this).click(resetPanel);
83      });
84    }
85  };
86}(jQuery, Drupal);