How to write a spreadsheet formula for ISBN-10 to ISBN-13 and ASIN

I wanted to convert 10 digit ISBNs to the new 13 digit format and vice versa for my "checking second-hand book prices given an ISBN" spreadsheet. It turns out that (for the moment) any ISBN-13 starting with 978 can be converted to an ISBN-10 and this will be the same as the ASIN used by Amazon, so this can be used to look up their data. The problem is that the last digit of the ISBN may change due to it being calculated using a different ISBN standard, so to convert from one to the other your spreadsheet needs to do the checksum calculation.

The following formulae are based on a 13 or 10 digit ISBN in cell A3 and cell A6 reserved for a check digit calculation. These should be in one line in a spreadsheet cell, the layout here is to help readability.

Formula to create ISBN-13 from ISBN-10

=if(
 len(A3)<11,
 concatenate(
   "978",
   mid(A3,1,9),
   mod(
     mid(A3,1,1)*3+
     mid(A3,2,1)+
     mid(A3,3,1)*3+
     mid(A3,4,1)+
     mid(A3,5,1)*3+
     mid(A3,6,1)+
     mid(A3,7,1)*3+
     mid(A3,8,1)+
     mid(A3,9,1)*3,
     10
     )
   ),
 A3
 )

Formula to create ISBN-10 from ISBN-13 (starting with 978)

=if(
len(A3)>10,
concatenate(
  mid(A3,4,9),
  if(A6=10,"X",A6)
  ),
A3
)

To calculate the check digit (A6)

=if(
len(A3)>10,
mod(
  mid(A3,4,1)+
  mid(A3,5,1)*2+
  mid(A3,6,1)*3+
  mid(A3,7,1)*4+
  mid(A3,8,1)*5+
  mid(A3,9,1)*6+
  mid(A3,10,1)*7+
  mid(A3,11,1)*8+
  mid(A3,12,1)*9,
  11
  ),
""
)

Re-list books on Amazon using iMacro

User Guide	This script imports my Google spreadsheet of books and then pastes them to sell on Amazon books. It takes about 20 seconds to list each book but you only process those in your spreadsheet marked to be re-listed. Example Google Spreadsheet.
Why?	Unless you pay £28.75 per month to Amazon Books to become a professional seller, you don't get the facility to import from a spreadsheet. This iMacro code does exactly that, for free, though it is of course intended for smallish quantities (in practice I'm normally adding less than 6 books at a time and have less than 20 books up for sale). Having recently realized that the handful of books I was trying to sell had not only all expired but had also permanently gone from my closed listings so I had to put them in from scratch, I had the incentive to spend a few hours playing with JavaScript and iMacro to find a decent work around.
Known Bugs	When I have more than 20 books the last ones on the list are ignored as already listed, probably due to export limitations with iMacro. My work around is to list new books at the top of the spreadsheet and it will work fine. You could also cut and paste previously listed books into a second page of the spreadsheet and keep the front page for new books to be listed.

/*****************************************************************************
Title: AMAZON BOOK LIST IMPORT FROM GOOGLE SPREADSHEET

Created: 15 May 2008
Last Edit: 17 May 2008
Author:  UserOffline.blogspot.com
If you find this script useful, blog me back.

Description:
This iMacro script reads data from a Google spreadsheet of books and then
writes all those (marked as unlisted) to Amazon. Progress is highlighted
in a pop-up window.
The google spreadsheet has data for:
[0] ISBN,
[1] Title (for convenience only, not used),
[2] Condition,
[3] Comments,
[4] Price,
[5] Listed (Yes/No).
This script is particularly handy for managing books taking longer than
Amazon's 60 day listing expiry to sell.

Assumptions:
1. Google spreadsheet published and the URL GOTO command below points to it.
Note by publishing your spreadsheet, in theory anyone could read it; if
they can find it. As there is no personal data apart from the price you
set for the books (which is published on your Amazon listing) this creates
no privacy risk that I can think of apart from someone associating your
Amazon trading name with your Google account name. If you consider this a
risk I suggest you create a new (free) Google account for this purpose.
2. You are logged in to your Amazon account.
3. You don't use Firefox while it is running.
Note run time is about 25s/book but this includes pauses so you can see
what is going on, remove these to save another 5 to 10 seconds.
4. You have iMacro (it's free) installed with Firefox.
5. This script does not remove listings from Amazon, so if you want to change
a listing do it by hand or delete the old one and use this script to create
it again.

Version History:
17 May Changed ISBN recognition to recognize ASINs as well.
******************************************************************************/

//Define functions

function writeResults(s){top.results.document.write(s)}
function showTime(d){
var myS=parseInt((d.valueOf()-startDate.valueOf())/1000);
return parseInt(myS/60)+" minutes "+(myS % 60)+" seconds";
}
/* Pad number with zeros */
function pad(number, length){
var str=""+number;
while(str.length<length){str = "0"+str}
return str;
}
/* Make a string iMacro command compliant */
function safe(str){
return str.replace(/\s/g,"<SP>").replace(/\n/g,"<BR>");
}

//Open progress window

top.results=window.open( "", "myWindow", "menubar=1,resizable=1,status=1,\
width=300,height=450,scrollbars=1,left=10,top=500");
writeResults("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \
\"http://www.w3.org/TR/html4/strict.dtd\">\
<html><head><title>Amazon book lister</title></head>\n\
<body bgcolor=lightyellow>\n\
<font face='Tahoma, Arial' size=1>\n\n");

//Variables

var cr="\n", i, j, startDate=new Date();
var books=new Array();  // 2 dim array for book data
var booksHTML=new Array(); // HTML rows from spreadsheet

//Get table of books and extract to booksHTML array

iimPlay("CODE:\
URL GOTO=http://spreadsheets.google.com/pub?\
*Your Google URL to a published spreadsheet goes here*\n\
TAG POS=3 TYPE=TABLE EXTRACT=HTML");
booksHTML=iimGetLastExtract(1).split("<tr");
j=0;
for(i in booksHTML){
/* check for ASIN/ISBN of 10+ digits or uppercase letters */
if(booksHTML[i].search(/[\dA-Z]{10}/)>-1){
books[j]=booksHTML[i].split("<td");
j++;
}
}
/* Note - I started off using </td to split the rows, which worked initially
but Google appears inconsistent in use of </td> as the next time I used it,
the </td> tags were sloppily not included in the web page source. */

//Tidy books array

for(i in books){
/* remove first chopped HTML tag (using "||" as a covenient marker) */
books[i]=books[i].join("||").replace(/\|[^\|<>]*>/g,"|").split("||");
/* drop first two elements as google spreadsheet chaff */
books[i].splice(0,2);
/* remove any leftover full HTML tag */
books[i]=books[i].join("||").replace(/<[^><\|]*>/g,"").split("||");
}

//Display and put details on Amazon

for(i in books){
if(books[i][5].search(/No/ig)>-1){
writeResults("<br>");
for(j in Array(0,1,2,3,4)){
writeResults(books[i][j]+"<br>\n");
}
iimPlay("CODE:\
URL GOTO=http://www.amazon.co.uk/gp/seller-account/management/your-account.html\n\
TAG POS=1 TYPE=A ATTR=ID:ListSingleItemsLink&&TXT:List<SP>single<SP>items\n\
'** ISBN **\n\
TAG POS=1 TYPE=INPUT:TEXT ATTR=NAME:*asin CONTENT="+
books[i][0]+"\n\
WAIT SECONDS=1\n\
TAG POS=1 TYPE=INPUT:IMAGE ATTR=ID:*asin.submit\n\
'** Condition and comments **\n\
TAG POS=1 TYPE=SELECT ATTR=NAME:*condition-type CONTENT=$"+
safe(books[i][2])+"\n\
TAG POS=1 TYPE=INPUT:TEXT ATTR=NAME:*condition-comments CONTENT="+
safe(books[i][3])+"\n\
WAIT SECONDS=1\n\
TAG POS=1 TYPE=INPUT:IMAGE\n\
'** Price **\n\
TAG POS=1 TYPE=INPUT:TEXT ATTR=NAME:selling-asking-price CONTENT="+
books[i][4].replace(/[^\d\.]/g,"")+"\n\
TAG POS=1 TYPE=INPUT:RADIO ATTR=VALUE:will-ship-to-united-states\n\
WAIT SECONDS=1\n\
TAG POS=1 TYPE=INPUT:IMAGE FORM=ACTION:/exec/varzea/sdp/sai-confirm*\n\
'** Final visual check **\n\
WAIT SECONDS=6\n\
TAG POS=2 TYPE=INPUT:IMAGE FORM=ACTION:/exec/varzea/sdp/sai-thank-you*\n\
");
writeResults("<span style='color:red;font-weight:bold'>[Book "+i+
" now listed on Amazon]</span><br>\n")
}else{
writeResults("<span style='color:green'>"+("[Book "+i+
" is already listed]</span>").replace(/\s/g,"&nbsp;")+" \n")
}
}

//Close down

var endDate=new Date();
writeResults('\n<p>Run time '+showTime(endDate)+"."+cr+
"<br>For more information see <a href='http://useroffline.blogspot.com'>\
UserOffline</a> blog.\n</font>\n</body>\n</html>");
top.results.document.close();
/* Could close when finished with top.results.window.close(); */

// END

How to add a book title from an ISBN or ASIN in a Google spreadsheet

Having recently created an iMacro to import books from Google spreadsheet to Amazon, I realized that the formula I was re-using to automatically put in the book title was quite a neat feature of Google docs that most people are probably unaware of.

I use the importXML function. This finds data based on an HTML tag in any webpage and you can create that source webpage name as a formula. This gives a really neat way of cribbing data about a book straight from it's Amazon webpage to be used on your own spreadsheet (also known as website scraping).

Here's my example formula (assuming the ISBN or ASIN is at cell A1), read this as one line:

=importXML( concatenate( "http://www.amazon.co.uk/exec/obidos/ASIN/", A1), "//span[@id='btAsinTitle']")

By looking at the webpage source code for any Amazon book you can find HTML tags around all of the product data. In this case the HTML tag <span> with the ID attribute set to "btAsinTitle" surrounds the book title. If you wanted to grab data on the number of pages, publisher or even lowest second hand price, this is all possible in a similar manner.

I have also created neat formulas to grab best match full film title and release date from IMDB.com as a search sheet to support my DVD index so I can quickly cut & paste details based on typing in key words from the film title.

The only limitation is there is a maximum of 50 such formulas in any spreadsheet. However if you are building a catalogue or sales list, it is a fairly simple matter to cut & paste the values over the formulas for books or DVDs already indexed so only new entries use the formula.