Using custom functions (FileMaker Pro Advanced)
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In the Edit Custom Function dialog box, for Function Name, type a name for the new function.
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If the formula requires parameters, for Function Parameters, type the parameter name and click Plus
 .You can edit or delete a parameter name by selecting it in the list and clicking Edit  or Delete  . |
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For Operators, choose an operator from the list.
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In the functions list, double-click a function. In the formula box, replace the placeholder parameter with a value or expression.
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You can also type parameter names, operators, and functions in the Edit Custom Function dialog box instead of using the lists or keypad.
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All accounts is the default option for Availability and allows all users of the current database to see and use the custom function. If you want the custom function to be available only to those with Full Access privileges, select Only accounts assigned full access privileges.
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Click OK to close the Edit Custom Function dialog box.
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Continue creating custom functions, or click OK to close the Manage Custom Functions dialog box.
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For Function Name, select the custom function and click Edit. In the Edit Custom Function dialog box, make your changes, then click OK.
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Tip You can Ctrl+click (Windows) or Command-click (Mac OS) to select non-contiguous functions, or Shift-click to select contiguous functions.
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Press Ctrl+C (Windows) Command-C (Mac OS), then click OK.
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Open a different FileMaker Pro file.
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The custom function you copied appears at the bottom of the list. If FileMaker Pro determines this function is invalid in the context of the target file (for example, a dependent function, field, or calculation is missing from the target file or the function contains an invalid field type reference), the pasted function is enclosed in comment characters (/*<function_definition>*/). For more information, see Custom Function dependency rules (FileMaker Pro Advanced).
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Click OK.
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To change the way functions are sorted in the Edit Custom Function dialog box, choose a category from the View list.
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The content of a custom function is protected even if it is set to be available to all users with Full Access privileges. To edit or view the custom function content, you must have Full Access privileges and be editing the database in FileMaker Pro Advanced.
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When a custom function is deleted, it is no longer available for use. Calculations that were using it will return an error when they attempt to call it. If you have Full Access privileges to a database and are editing a calculation that uses a deleted custom function, the name of the function is replaced with the string <Function Missing>.
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If you do not have Full Access privileges and attempt to edit a calculation that uses a custom function restricted to Full Access accounts, you see the string <Private Function> instead of the custom function. You cannot change the calculation as long as the <Private Function> declaration appears in the formula.
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If you have previously created custom functions and the names are identical to new FileMaker software functions, the FileMaker functions will override your custom functions. Verify your custom function names against the FileMaker functions, and change your custom function names if needed.
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The characters $ and } can no longer be used in a custom function name or a parameter name. If you used these characters in custom function or parameter names in FileMaker Developer, you must rename them in FileMaker Pro Advanced.
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