Brian Dunning's FileMaker Custom Functions

NextID ( valueList ; start )

Returns the lowest NOT used number of a value list.

  Average rating: 3.9 (42 votes) Log in to vote

Daniele Raybaudi   Daniele Raybaudi - Show more from this author

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  Sample input:
NextID ( 1¶2¶3¶4 ; 1 )
NextID ( 4¶6¶8¶9 ; 1 )
NextID ( "" ; 1 )
  Sample output:

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

NextID ( valueList ; start ) custom function

Author: Daniele Raybaudi

valueList - list of numbers
start - number from wich to start the progression

Returns the lowest NOT used number of a value list.
NextID ( 1¶2¶3¶4 ; 1 ) returns: 5
NextID ( 4¶6¶8¶9 ; 1 ) returns: 1
NextID ( "" ; 1 ) returns: 1

I used this CF to automatically recover the progression of an auto-entered number, when a record is deleted.
Simply make:
1) a value list ( "IDs" ) with values coming from the field
2) enter this calc into the option for auto-enter a value in the field:
NextID ( ValueListItems ( Get ( FileName ) ; "IDs" ) ; 1 )

BTW: try the free demo file at:



Heidi   Heidi, Mechanicsburg PA
Feb 12, 2010
THANK YOU! This is EXACTLY what I was looking for!
Simon Plint   Simon Plint, Newcastle/Australia
Mar 21, 2010
lloop   lloop, Vienna, Austria
Nov 25, 2010
Ditto (Ditto + 1)
matrix2012   matrix2012, italy
Mar 19, 2012
La funzione e bellissima, purtroppo, se "duplico" un record, il nr. progressivo non si aggiorna, lo stesso errore, si evidenzia se importi dati da un'altro file.
Mi farebbe piacere sapere se è possibile un intervento di rettifica in modo da farla funzionare anche con i due errori suddetti.

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