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There are 2,521 functions in this library.

ISBN10Check ( ISBN10 ; text )

validates ISBNs

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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 ( isbn10 ; 1 ; 1 ) * 1 ; v2 = Middle ( isbn10 ; 2 ; 1 ) * 2 ; v3 = Middle ( isbn10 ; 3 ; 1 ) * 3 ; v4 = Middle ( isbn10 ; 4 ; 1 ) * 4 ; v5 = Middle ( isbn10 ; 5 ; 1 ) * 5 ; v6 = Middle ( isbn10 ; 6 ; 1 ) * 6 ; v7 = Middle ( isbn10 ; 7 ; 1 ) * 7 ; v8 = Middle ( isbn10 ; 8 ; 1 ) * 8 ; v9 = Middle ( isbn10 ; 9 ; 1 ) * 9 ; vSum = Evaluate ( v1 + v2 + v3 + v4 + v5 + v6 + v7 + v8 + v9 ); modSum = Mod ( vSum ; 11 ) ] ; Case ( Length ( isbn10 ) > 10 ; text ; modsum = 10 and Middle (isbn10 ; 10 ; 1 ) = "x" ; "" ; modSum = Middle ( isbn10 ; 10 ; 1 ) ; "" ; text ) ) Click to copy

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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