Development Guide

Chapter 3 | Customizing database solutions 19
Creating custom functions
Use the Custom Functions feature to create custom functions that can be reused anywhere in a
database file and copied or imported to other FileMaker
Pro files. Once formulas are written for
the function, they don’t have to be rewritten to be applied to other fields or used in other scripts.
You can maintain and edit custom functions and the formulas they contain in one central location.
Any change made to the custom function will be copied to all instances where that custom function
has been used.
To create a custom function:
1. Choose File menu > Manage > Custom Functions.
2. In the Manage Custom Functions dialog box, click New.
3. In the Edit Custom Function dialog box, type a name for the function and build a formula.
4. Click OK.
For more information about creating custom functions, see Help.
Function
list
Formula box
Parameters
list
Your custom parameters
appear in this space
View list (opened)
Edit Custom Function dialog box