DebouncedAsyncValidator class

Delays the execution of an AsyncValidator by a specified duration.

This validator is useful for scenarios where you want to delay validation until the user has stopped typing for a certain period. It helps to avoid excessive validation requests, for example, when validating a username for availability against a remote server.

The DebouncedAsyncValidator should be used when you need to specify a custom debounce time for a single validator. If you want to apply the same debounce time to all asynchronous validators of a form control, it is more convenient to use the FormControl.asyncValidatorsDebounceTime property.

Example:

final control = FormControl<String>(
  asyncValidators: [
    DebouncedAsyncValidator(
      Validators.delegateAsync((control) async {
        // Your validation logic here
        return null;
      }),
      500, // Debounce time in milliseconds
    ),
  ],
);

In this example, the validation will only be triggered after the user has stopped typing for 500 milliseconds.

Inheritance

• Object
• AsyncValidator
• DebouncedAsyncValidator

Constructors

DebouncedAsyncValidator(AsyncValidator _validator, int _debounceTime)

Creates a new instance of the DebouncedAsyncValidator class.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

call(AbstractControl control) → Future<Map<String, dynamic>?>

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(AbstractControl control) → Future<Map<String, dynamic>?>

Validates the control.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited