To validate text field as soon as its value changes. We can add list of validators for different cases and it shows error message depending upon the conditions unsatisfied.
A Flutter package which validates text field dynamically as soon as value changes. You can give list of validators as shown below in example to dynamically validate according to the validators.
To use this package, add
as a dependency in your pubspec.yaml file.
AutoValidatingTextFormField( decoration: InputDecoration( hintText: "Full Name", ), focusNode: _fullNameFocusNode, controller: _fullNameController, validators: [ Validators.required(), Validators.pattern("^[a-zA-Z ]*\$", errorText: "Full Name cannot contains special characters."), ] );
Please see the example app of this package for a full example in https://github.com/rmsh03dhj/auto_validating_text_field/tree/master/example/lib.