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 FileMaker Pro Custom Functions

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LongestString ( text )

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  Average rating: 4.2  (32 votes)
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Daniele Raybaudi, ACI

Returns the longest string of a given text and its length.

Sample Input:
LongestString ( "This is a really long text string that Jonathan needs to display narrowly in a huge text field." )
Sample Output:

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

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


LongestString custom function

Author: Daniele Raybaudi

Returns the longest string of a given text and its length; if more than one string has the same length, it returns the last.
A string is definited as a space separated part of text.

I had to find a way to stop a bug of the good WordWrap CF by Jonathan Stark: it fails when the "size" parameter is lower than the longest word of the given text.

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

This is my Custom Function and I want to edit it


Hello, I tried implementing on a current text field, but cannot get an sample output. I created a new text field as calculation, and set it to use the custom function. Do I need to pass any parameters to the function?

Greg, Bennington, VT
June 19, 2014 9:28am

You'll need to create a calculation field, result text.
Also you'll need the Advanced version of Filemaker.

Daniele Raybaudi, Rome
June 20, 2014 1:43am

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