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ISBN13Check ( ISBN13 ; text )

validates ISBN-13

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Larry Nichols - Show more from this author n/a n/a

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

Let ( [ v1 = Middle ( isbn13 ; 1 ; 1 ) * 1 ; v2 = Middle ( isbn13 ; 2 ; 1 ) * 3 ; v3 = Middle ( isbn13 ; 3 ; 1 ) * 1 ; v4 = Middle ( isbn13 ; 4 ; 1 ) * 3 ; v5 = Middle ( isbn13 ; 5 ; 1 ) * 1 ; v6 = Middle ( isbn13 ; 6 ; 1 ) * 3 ; v7 = Middle ( isbn13 ; 7 ; 1 ) * 1 ; v8 = Middle ( isbn13 ; 8 ; 1 ) * 3 ; v9 = Middle ( isbn13 ; 9 ; 1 ) * 1 ; v10 = Middle ( isbn13 ; 10 ; 1 ) * 3 ; v11 = Middle ( isbn13 ; 11 ; 1 ) * 1 ; v12 = Middle ( isbn13 ; 12 ; 1 ) * 3 ; vSum = Evaluate ( v1 + v2 + v3 + v4 + v5 + v6 + v7 + v8 + v9 + v10 + v11 + v12 ); modSum = Mod ( vSum ; 10 )]; Case ( Length ( isbn13 ) > 13 ; text ; modSum = 0 and Middle ( isbn13 ; 13 ; 1 ) = 0 ; "" ; 10 - modSum = Middle ( isbn13 ; 13 ; 1 ); "" ; text ) ) Click to copy

For booksellers and others who need to validate their 13-digit ISBNs during data entry, this function checks a number against the industry calculation for ISBN13s 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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