.NODE

IsValid()

Category: Logical

Syntax: IsValid ( expression )


Parameters:

expressionTypically a field name, but can be any valid FileMaker Pro calculation formula.

Data type returned: Number

Description:

Returns either a 1 (true) or a 0 (False), depending on whether the field or expression returns valid data.

IsValid returns a 0 if there is a data type mismatch (for example, text in a date field) or if FileMaker cannot locate the table or field that is referenced.

Otherwise it returns 1, indicating that the data is valid.

Examples:

Function

Results

IsValid (myField)

Returns 1 (true) when myField is present and contains data appropriate to its defined data type.

IsValid (Contacts::Name)

Returns 0 (False) if the current record has no related records in the Contacts table, or if the fields in the records in question all contain invalid data.




: FileMaker Specifications

FileMaker 8 Product Line

Specifications and Storage Limits

Field Types and Import/Export Formats

: Calculation Functions

Working with Calculations Primer

Calculation Signatures

Calculation Functions

: Custom Functions

Custom Functions Primer

Useful Custom Functions

: Script Steps

Scripting Primer

Script Step Reference

: Quick Reference

FileMaker Error Codes

FileMaker Keyboard Shortcuts

FileMaker Network Ports

FileMaker Server Command Line Reference

FileMaker XML Reference

: Other Resources

Where to Go for More Information

show all menu





FileMaker 8 Functions and Scripts Desk Reference
FileMaker 8 Functions and Scripts Desk Reference
ISBN: 0789735113
EAN: 2147483647
Year: 2004
Pages: 352
Similar book on Amazon

Flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net