IsValid
 
Purpose 
Returns 0 (false) if the data is invalid; otherwise, returns 1 (true).
Format 
IsValid(field)
Parameters 
field - any field name
Data type returned 
number
Originated in 
FileMaker Pro 6.0 or earlier
Description 
Returns 0 (False) if:
 •
 •
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Otherwise, it returns 1 (the data is valid).
Note  IsValid does not check field validation options defined in the Manage Database dialog box. Define field validation options to make sure that data is correctly entered into fields during data entry and import. See Defining field validation.
Examples 
IsValid(Datefield) returns 0 if there is non-date data in Datefield, for example if text was imported into it.
IsValid(Amount) returns 0 if there is only text in the number field Amount.
IsValid(table::field) returns 0 if the related table was renamed and the relationship isn’t updated with the new filename.
Related topics 
Functions reference (category list)
Functions reference (alphabetical list)
About formulas
About functions
Defining calculation fields
Using operators in formulas