JS for handling empty links, PDF links and external links

global.js

(function (win, doc) {

    doc.addEventListener('DOMContentLoaded', () => {

        // Prevent empty links from doing anything
        [].forEach.call(doc.querySelectorAll('a[href="#"]'), function (el) {
            el.addEventListener('click', function (e) {
                e.preventDefault();
            });
        });

        // Force all PDF links to download automatically, if the browser supports it. Otherwise, open in a new tab.
        [].forEach.call(doc.querySelectorAll('a[href$=".pdf"]'), function (el) {
            el.setAttribute('download', '');
            el.setAttribute('target', '_blank');
        });

        // Force all external links to open in a new url (securely)
        [].forEach.call(doc.querySelectorAll('a[href]'), function (el) {
            if (el.getAttribute('href').substr(0, 7) !== 'mailto:') {
                var isInternalLink = new RegExp('/' + window.location.host + '/');
                if (!isInternalLink.test(el.href)) {
                    el.setAttribute('target', '_blank');
                    el.setAttribute('rel', 'noopener noreferrer');
                }
            }
        });

    });


})(window, window.document);