Use this rule type to ensure the target editor value is specified. The rule will be broken in the following cases.
- If the validated value is null.
- If the specified value has a type that is not expected for the target field (e.g., a string for the DateBox widget).
You do not have to specify this field. If you chose not to specify it, a default message will be shown. To include the name of the validated editor into the default validation message as a subject, set the name field of the dxValidator object.
If you assign an empty string to the message field, the message will not be shown.