Formx

Acessing the state

BuildContext.formx([String? key]) automatically retrieves the appropriate FormState for you, though you can specify a key if necessary.

final addressState = context.formx();
// specify if multiple forms:
final addressState = context.formx('address'); 

if (addressState.validate()) {
  final map = addressState.toMap();
  addressState.save(); // do something with map
} else {
  throw FormxException(addressState.errorTexts);
}

You can do the same for a specific field final emailState = context.field('email')

Submit shortcut

Performs .validate(), .save() and .toMap(). Throws errorTexts if invalid.

// essentially the same as the code above, but in one line
final map = context.submit('address');
final mapOrNull = context.trySubmit('address');

We recommend using it with flutter_async to handle errors effortlessly.

FormState extensions

• .toMap({FormxOptions? options}), a structured Map with all the values of the form.
  • Use options to modify the output. If null, the global Formx.options will be used.
  • If a Key is used, it will apply the associated adapter or unmask to the value.
• .rawValues, a structured Map with all [FormFieldState.value]. Unmodified.
• .initialValues, a structured Map with all [FormField.initialValue]. Unmodified.
• .isInitial, whether any nested [FormFieldStateExtension.isInitial].
• .hasInteractedByUser, whether any nested [FormFieldState.hasInteractedByUser].
• .hasError, whether any nested [FormFieldState.hasError].
• .isValid, whether all nested [FormFieldState.isValid].
• .invalids, a list with all invalid field keys, regardless if validated.
• .errorTexts, a flat Map with all nested [FormFieldState.errorText].
• .fill(Map<String, dynamic> map), sets each associated field by it's key-value pair.

FormxState extension type

FormxState is an inline-class that redeclares some of the FormState methods:

• .validate([List<String>? keys])
• .save([List<String>? keys])
• .reset([List<String>? keys])

These methods function identically to their original counterparts but extend their effects to nested forms. Using FormState.validate only validates the top-level form, whereas FormxState.validate also validates any nested forms.

You have the option to specify a list of keys with these methods to target specific forms or fields for validation, saving, or resetting.

You can redeclare any FormState to a FormxState by using FormxState(formState) type extension.

FormFieldState extensions

• .setErrorText(String? errorText), sets the field errorText programmatically. Requires Validator.

FormxSetup

You can use Formx.setup to set global options for all formx widgets.

• defaultTitle to set the default title for fields that internally use ListTile.
• datePicker to pick a date in FormField<DateTime> fields.
• image/filePicker to pick a file in FormField<XFile> fields.
• image/filesPicker to pick a file in FormField<List<XFile>> fields.
• image/fileUploader to upload a file in FormField<XFile> fields.
• image/fileDeleter to delete a file in FormField<XFile> fields.

FormxOptions

You can use Formx.options to modify FormState.values output.

• trim removes leading and trailing whitespaces.
• unmask removes all [MaskTextInputFormatter] masks.
• nonNull removes all null values.
• nonEmptyMaps removes all empty maps.
• nonEmptyStrings removes all empty strings.
• nonEmptyIterables removes all empty iterables.

By default, all options are enabled, except for [nonEmptyIterables].

To get the unmodified values, use FormState.rawValues.

To understand how masks are applied, see mask_text_input_formatter library, also exported by this package.

FieldKey options

• .adapter to format the field value.
• .unmask to (un)mask the field value, regardless of the form global options.

TextFormField(
  key: const Key('age').options(
    unmask: true,
    adapter: (String value) => value?.toInt(),
  ),
),

Validator class

Looking for a way to create validators declaratively? The Validator class provides a readable and declarative approach to defining validation rules for your Dart applications.

TextFormField(
  validator: Validator<String>(
    required: true,
    test: (value) => value.isEmail,
  ),
),

For the one-liners, the modifiers allows you to chain your validators.

TextFormField(
  validator: Validator().required().email(),
),

Customizing

// You can set a default `requiredText`/`invalidText` for all validators:
Validator.defaultRequiredText = 'This field is required';
Validator.defaultInvalidText = 'This field is invalid';

// You can also modify the errorText of a validator:
Validator.translator = (key, errorText) => errorText; // good for translations

// And disable them all:
Validator.disableOnDebug = true; // only works on debug mode

Modifiers

• .test(bool Function(T value) test)
• .number(bool Function(num value) test)
• .datetime(bool Function(DateTime value) test)
• .required
• .email
• .url
• .phone
• .creditCard
• .cpf
• .cnpj
• .date
• .alpha
• .numeric
• .alphanumeric
• .hasAlpha
• .hasNumeric
• .hasAlphanumeric
• .hasUppercase
• .hasLowercase
• .hasSpecialCharacter
• .minLength(int length)
• .maxLength(int length)
• .minWords(int words)
• .maxWords(int words)
• .minNumber(num number)
• .maxNumber(num number)
• .isAfter(DateTime date)
• .isBefore(DateTime date)

Validators, Sanitizers & Helpers extensions

Formx comes bundled with a set of built-in validators and sanitizers, which you can use to validate and sanitize your form fields.

String

• .isPhone
• .isCpf
• .isCnpj
• .numeric (returns the numbers)
• .alpha (returns the letters)
• .alphanumeric (returns numbers/letters)
• .hasAlpha
• .hasNumeric
• .hasAlphanumeric
• .hasUppercase
• .hasLowercase
• .hasSpecialCharacters
• .equalsIgnoreCase(String)

Iterable

• .castJson() for casting any List as List<Map<String, dynamic>>.
• .mapJson() for mapping any jsonList to List.
• .orderedBy(R selector(T), {bool ascending}) for ordering.

Map

• .pairs for getting a list of key-value pairs.
• .indented for a map view that indents when printed.
• .indentedText for getting an indented text.
• .deepMap() for mapping nested maps.
• .clean() for values that are null or empty string/iterable/map.
• .cleaned() for a new map with all null or empty values removed.

Deeply recases all your map keys:

• .camelCase "camelCase"
• .constantCase "CONSTANT_CASE"
• .sentenceCase "Sentence case"
• .snakeCase "snake_case"
• .dotCase "dot.case"
• .paramCase "param-case"
• .pathCase "path/case"
• .pascalCase "PascalCase"
• .headerCase "Header-Case"
• .titleCase "Title Case"

Additionally exports recase library. See it for complete list of extensions.

List<Widget>

• .keepAlive usually needed for building forms with [PageView.children].
• .expanded usually needed for building forms with [Column.children] or [Row.children].

Contributing

Contributions to formx are welcome! Whether it's bug reports, feature requests, or pull requests, all "forms" of collaboration can help make formx better for everyone.