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 FileMaker Pro Custom Functions

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ISBN13 ( ISBN )

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  Average rating: 4.1  (35 votes)
  Discuss this Custom Function

Rolf Clausen, Mallverkstan
http://www.mallverkstan.com

Converts an old ISBN number to the new ISBN13 format.

Sample Input:
ISBN13 ( "91-44-04236-1" )
Sample Output:
"978-91-44-04236-7"


 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Description:

Converts an old ISBN number to the new ISBN13 format.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it

Discuss:

Useful thank you, but now amazon have changed their rules again, and I can no longer NOT provide an ISBN10, but must provide a 13, along with a 10.

Nuisance for books published recently.

Can you do a conversion script for ISBN13 to 10 ?

david, Melbourne
June 13, 2015 7:09pm

Let (
[
$ISBN_noHyphen = Substitute ( ISBN ; "-" ; "" ) ;
$ISBN_stripCheck = Left ( $ISBN_noHyphen ; 12 ) ;
$ISBN_stripLead = Right ( $ISBN_stripCheck ; 9 ) ;
$weightage = ( Middle ( $ISBN_stripLead ; 1 ; 1 ) * 10 ) +
( Middle ( $ISBN_stripLead ; 2 ; 1 ) * 9 ) +
( Middle ( $ISBN_stripLead ; 3 ; 1 ) * 8 ) +
( Middle ( $ISBN_stripLead ; 4 ; 1 ) * 7 ) +
( Middle ( $ISBN_stripLead ; 5 ; 1 ) * 6 ) +
( Middle ( $ISBN_stripLead ; 6 ; 1 ) * 5 ) +
( Middle ( $ISBN_stripLead ; 7 ; 1 ) * 4 ) +
( Middle ( $ISBN_stripLead ; 8 ; 1 ) * 3 ) +
( Middle ( $ISBN_stripLead ; 9 ; 1 ) * 2 ) ;
$checkDigit = Mod ( 11 - Mod ( $weightage ; 11 ) ; 11 )
] ;
Middle ( ISBN ; 5 ; 12) & If ( $checkDigit = 10 ; "X" ; $checkDigit )
)

PRob, NY
April 05, 2018 9:31am

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