https://www.fanshawec.ca/modules/contrib/obfuscate_email/js/obfuscate_email.js?tlu24v

1(function (Drupal) {
2  'use strict';
3
4  function init(context) {
5    var elements = context.querySelectorAll('[data-mail-to]');
6    var clickable = context.querySelectorAll('[data-mail-click-link]');
7
8    if (!elements) {
9      return;
10    }
11
12    /**
13     * Shift the string with rot 13.
14     * Rewrite from Jonas Raoni Soares Silva
15     *
16     * @see http://jsfromhell.com/string/rot13 [rev. #1]
17     *
18     * @param string
19     * @returns string
20     */
21    function rot13(string) {
22      return string.replace(/[a-zA-Z]/g, function (c) {
23        return String.fromCharCode((c <= 'Z' ? 90 : 122) >= (c = c.charCodeAt(0) + 13) ? c : c - 26);
24      });
25    }
26
27    /**
28     * Decrypt the string to an email.
29     *
30     * @param string
31     * @returns string
32     */
33    function normalizeEncryptEmail(string) {
34      string = rot13(string);
35      string = string.replace(/\/dot\//g, '.');
36      string = string.replace(/\/at\//g, '@');
37
38      var encodedString = Drupal.checkPlain(string);
39      // revert encoding of ampersands as this is invalid for mailto: links
40      encodedString = encodedString.replace(/&amp;/g, '&')
41      return encodedString;
42    }
43
44    function setMailAddress(element) {
45      var mailTo = normalizeEncryptEmail(element.getAttribute('data-mail-to'));
46      var replaceInner = element.getAttribute('data-replace-inner');
47
48      element.removeAttribute('data-mail-to');
49      element.removeAttribute('data-replace-inner');
50
51      // set href if anchor tag
52      if (element.tagName === 'A') {
53        element.setAttribute('href', 'mailto:' + mailTo);
54      }
55
56      // replace whole string
57      if (replaceInner === 'true' || replaceInner === '') {
58        element.innerHTML = mailTo;
59
60        return;
61      }
62
63      // replace the token given in [data-replace-inner]
64      if (replaceInner) {
65        element.innerHTML = element.innerHTML.replace(replaceInner, mailTo);
66      }
67    }
68
69    if (clickable.length) {
70        Array.prototype.slice.call(elements).forEach( function(element) {
71          element.addEventListener('click', function (event) {
72          if (element.className.split(/\s+/).indexOf('link-processed') === -1) {
73            event.preventDefault();
74            setMailAddress(element);
75            element.classList.add('link-processed');
76          }
77        });
78      });
79
80      return;
81    }
82
83    NodeList.prototype.forEach = Array.prototype.forEach;
84
85    elements.forEach(function (element) {
86      setMailAddress(element);
87    });
88  }
89
90  Drupal.behaviors.obfuscateEmailField = {
91    attach: init
92  };
93})(Drupal);