FieldName event
This event occurs when a when user attempts to set a new value for a field on the form.
| Argument | Description | 
|---|---|
| fieldname | The name of the field that requires validation. | 
| fieldvalue | The value of the field that requires validation. | 
Remarks
You can use this event to perform tasks such validating user input for a form field. If the return value is empty string then validation is assumed to have been successful.
Example
Function Field_OnValidate(FieldName, FieldValue)
  Field_OnValidate = ""
  'Write custom validation to check that the user is attempting to enter a value
  'for the Amount field that is less then 100.
  If (FieldName = ”Amount”) Then
    If (CInt(FieldValue) > 100) Then
      Field_OnValidate = ”Amount cannot be greater than 100.”
    End If
  End If
End Function