ConditionalValidator<T> class

ConditionalValidator extends BaseValidator to conditionally validate a value based on a provided condition.

Parameters:

condition A function that returns a boolean indicating whether the validator should be applied.
validator The validator to apply if the condition is met.
checkNullOrEmpty Whether to check if the value is null or empty. This is set to false by default.

Inheritance

ConditionalValidator(bool condition(T? value), FormFieldValidator<T> validator): Constructor for the conditional validator.
const

checkNullOrEmpty → bool: Whether to check if the value is null or empty.
finalinherited
condition → bool Function(T? value): A function that returns a boolean indicating whether the validator should be applied.
final
errorText → String?: The error message returned if the value is invalid.
no setterinherited
hashCode → int: The hash code for this object.
no setterinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
validator → FormFieldValidator<T>: The validator to apply if the condition is met.
final

isNullOrEmpty(T? valueCandidate) → bool: Checks if the value is null or empty. Returns true if the value is null or empty, otherwise false. The value is considered empty if it is a String, Iterable, or Map and it is empty or contains only whitespace characters. If the value is not a String, Iterable, or Map, it is considered empty if it is null.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited
validate(T? valueCandidate) → String?: Validates the value and checks if it is null or empty.
override
validateValue(T? valueCandidate) → String?: Validates the value. Returns null if the value is valid, otherwise an error message. Call validate() instead of this method when using the validator.
override