Open external links in a new tab

external-links.js

jQuery(document).ready(function($) {
  
  $(document).on('click', 'a', function(e) {
    if (this.href.indexOf('http') !== -1 && this.href.indexOf(location.host) === -1) {
      e.preventDefault();
      window.open(this.href, '_blank').focus();
    }
  });
  
});