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    TField.OnValidate

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

    Declaration

    Source position: db.pas line 499

    published property OnValidate: TFieldNotifyEvent;

    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

    Name Description
    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.