Brian Dunning's FileMaker Custom Functions

ISBN10Check ( ISBN10 ; text )

validates ISBNs

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Larry Nichols   Larry Nichols

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  Sample input:
ISBN10Check ( 0399242601 ; "Invalid ISBN!" )
  Sample output:
Invalid ISBN! (number should be 0399242600)

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

For booksellers and others who need to validate their 10-digit ISBNs during data entry, this function checks a number against the industry calculation for ISBNs and outputs a warning message of your choice if validation fails. I recommend nesting the TextColor () function in the second parameter to make the warning message more eye-catching.



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

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