cannot read properties of undefined split

I am trying to get the values of _clickHref and _pageName, however if I use the code:

jQuery().ready(function(){
var _clickHref = jQuery(this).attr('{{Referrer}}');
var _pageName= _clickHref.split('/').filter(Boolean);
_pageName = _pageName[_pageName.length-1];
  
window.dataLayer = window.dataLayer || [];
    window.dataLayer.push({
      'event': 'special_offer',
      'carouselHref' : _clickHref,
      'modelName': _pageName
    });
  });

I get the error ‘cannot read properties of undefined split’

and when I write the code:

jQuery().ready(function(){
var _clickHref = jQuery(this).attr('{{Referrer}}');
var _pageName= undefined;
  
window.dataLayer = window.dataLayer || [];
    window.dataLayer.push({
      'event': 'special_offer',
      'carouselHref' : _clickHref,
      'modelName': _pageName
    });
  });

‘carouselHref’is undefined. how to get the values of both carousalHref and modelName?

>Solution :

The referrer is in document.referrer, not an attribute.

var _clickHref = document.referrer;