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 FileMaker Pro Custom Functions

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isNull( text )

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  Average rating: 4.6  (25 votes)
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Derek Bastille, University of Alaska Fairbanks
http://www.uaf.edu

Checks to see if the input is NULL

Sample Input:
$foo = Null
isNull($foo)
$foo = ""
isNull($foo)
Sample Output:
1
0


 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

Description:

This is the companion function to Null. It can be used to check to see if a variable, string, etc. has been set to the value NULL. This can be very useful when testing input values that might be empty or when returning an error condition from a script or expression. I frequently use it in conjunction with get(ScriptParameter). As in:

Let(
in = get(ScriptParameter);

if( in = ""; Null; in)
)

Later, if I set a variable to NULL, then the variable won't 'disappear' like it would if I set it to ""

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

This is my Custom Function and I want to edit it

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