A validation rule that demands that a validated field has a value.

Type: Object

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 dxDateBox widget).
Show Example:


Specifies the message that is shown for end-users if the current rule is broken.

Type: String
Default Value: 'Required'

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.


Indicates whether to remove the Space characters from the validated value.

Type: Boolean
Default Value: true

To keep the Space characters within the validated value, set this field to false.


Specifies the type of the current rule.

Type: String
Accepted Values: 'required'

Set this field to 'required' to define a rule that will be broken if the validated value is not specified.