Add to Goodreads from Amazon.com book page bookmarklet

goodreads-bookmarklet.js

javascript: var asin_elements, asin;asin_elements = document.getElementsByName('ASIN'); if (asin_elements.length == 0) { asin_elements = document.getElementsByName('ASIN.0'); };if (asin_elements.length == 0) { alert('Sorry, this doesn\'t appear to be an Amazon book page.'); }else {  asin = asin_elements[0].value;  if (asin.match(/\D/) === null) { var x = window.open('http://www.goodreads.com/review/isbn/'+ asin, 'add_review'); } else { var x = window.open('https://www.goodreads.com/search?q='+ asin); } x.focus();}

Terrific! Glad you were able to make something work :)

This wasn't working for me with Kindle books kept loading goodreads and saying Page Unavailable An unexpected error occurred. We will investigate this problem as soon as possible — please check back soon! So I changed the following URLs and seems to be working now. Tested on Kindle, Paperback and Hardback and goodreads loads each time.

Changed:

var x = window.open('https://www.goodreads.com/search?q='+ asin);

To:

var x = window.open('https://www.goodreads.com/book/isbn?isbn='+ asin);

Working Bookmarklet:

javascript: var asin_elements, asin;asin_elements = document.getElementsByName('ASIN'); if (asin_elements.length == 0) { asin_elements = document.getElementsByName('ASIN.0'); };if (asin_elements.length == 0) { alert('Sorry, this doesn\'t appear to be an Amazon book page.'); }else {  asin = asin_elements[0].value;  if (asin.match(/\D/) === null) { var x = window.open('http://www.goodreads.com/review/isbn/'+ asin, 'add_review'); } else { var x = window.open('https://www.goodreads.com/book/isbn?isbn='+ asin); } x.focus();}

Awesome, thanks @SirGryphin