A validation rule that demands that a validated editor has a value that is equal to a specified expression.
To specify the expression that the validated field must match, set the rule's comparisonTarget configuration option. Assign a function to this option. The validated value will be compared to the function's return value. The comparison will be performed by using the operator that is set for the comparisonType option.
The rule is valid if the validated value is equal to the return value of the comparisonTarget function.
Specifies the operator to be used for comparing the validated value with the target.
ComparisonOperator enum to specify this option when the widget is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values:
You do not have to specify this field. In this instance, 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 or not the rule should be always checked for the target value or only when the target value changes.
Set this field to "compare" to define a rule that will be broken if the validated value does not equal to the return value of the specified comparisonTarget function.