Validator class Null safety

The generic validator class that can be used for various validation purposes

Subclass it accordingly to build your own kind of validation(s). Refer to either ValidatorNumber or ValidatorString for more details.

The common use case is for TextFormField where you can add any of the validators in TextFormField.validator e.g.

TextFormField(
 decoration: InputDecoration(labelText: 'Test Less Than 5 and Positive'),
 keyboardType: TextInputType.number,
 validator: (v) => ValidatorNumber(v).lt(5).positive().build(),
);
Implementers

Constructors

Validator(dynamic value)

Properties

hashCode int
The hash code for this object.
read-onlyinherited
runtimeType Type
A representation of the runtime type of the object.
read-onlyinherited
value ↔ dynamic
read / write

Methods

build() String?
length({int min = 0, int max = int64Max, String errMsg(String val, int min, int max)?}) Validator
Checks the length of the value makes sure it's between min and max range
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
optional() Validator
toString() String
A string representation of this object.
inherited
unless(ValidationUnless checker) Validator
validate(ValidationRule rule) Validator

Operators

operator ==(Object other) bool
The equality operator.
inherited