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

TField.OnValidate

Event to validate the value of a field before it is written to the data buffer

Declaration

Source position: db.pas line 467

published property TField.OnValidate : TFieldNotifyEvent
  read FOnValidate
  write FOnValidate;

Description

OnValidate is called prior to writing a new field value to the dataset's data buffer. It can be used to prevent writing the new value to the buffer by raising an exception in the event handler. Note that this event handler is always called, irrespective of the way the value of the field is set.

See also

TField.Text

  

Text representation of the field

TField.OnGetText

  

Event to format the field's content

TField.OnSetText

  

Event to set the field's content based on a user-formatted string

TField.OnChange

  

Event triggered when the field's value has changed


Documentation generated on: Jun 22 2020