[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'DB' (#fcl)


Check whether a character is valid input for the field


Source position: db.pas line 397

public function TField.IsValidChar(

  InputChar: Char

):Boolean; virtual;




Character to check

Function result

True if InputChar is in the set ValidChars.


IsValidChar checks whether InputChar is a valid characters for the current field. It does this by checking whether InputChar is in the set of characters specified by the TField.ValidChars property. The ValidChars property will be initialized to a correct set of characters by descendent classes. For instance, a numerical field will only accept numerical characters and the sign and decimal separator characters.

Descendent classes can override this method to provide custom checks. The ValidChars property can be set to restrict the list of valid characters to a subset of what would normally be available.

See also



Characters that are valid input for the field's content

Documentation generated on: Jun 22 2020