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LibraryThing WorldCat direct link

Makes a "direct" link to the work on WorldCat, similar to how the Amazon.com direct links works

// ==UserScript==
// @name        LibraryThing WorldCat direct link
// @namespace   https://greasyfork.org/en/users/11592-max-starkenburg
// @description Makes a "direct" link to the work on WorldCat, similar to how the Amazon.com direct links works
// @include     http*://*librarything.tld/work/*
// @include     http*://*librarything.com/work/*
// @version     3
// @grant       none
// ==/UserScript==

var metas = document.getElementsByTagName("meta");
var ltworkisbn = document.getElementById("ltworkisbn");
var isbn = "9781111111111"; // 9781111111111 is apparently what LT puts on ISBN-less works
if (ltworkisbn) {
  isbn = ltworkisbn.textContent;
}
if (isbn == "9781111111111") {
  for (var i=0; i<metas.length; i++) {
    if (metas[i].getAttribute("property") == "books:isbn") {
      isbn = metas[i].content;
      break;
    }
  }
}
if (isbn != "9781111111111") { 
  var wcLink = "";
  var qls = document.getElementsByClassName("ql_printdisplay_line");
  for (var i=0; i<qls.length; i++) {
    if (qls[i].getAttribute("bsm_code") == "700:1") {
      wcLink = qls[i].getElementsByTagName("a")[1]; // the first link is the icon
      break;
    }
  }
  if (wcLink != "") {
    var direct = document.createElement('span');
    direct.innerHTML = ' (<a href="http://worldcat.org/isbn/' + isbn + '">direct</a>)';
    wcLink.parentNode.insertBefore(direct, wcLink.nextSibling);
  }
}