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Formify is a versatile and customizable form handling library for Flutter, designed to simplify the process of creating and managing forms in your Flutter applications

Formify #

Formify is a versatile and customizable form handling library for Flutter, designed to simplify the process of creating and managing forms in your Flutter applications. With Formify, you can effortlessly build dynamic forms, validate user input, and handle form submission with ease.

Features #

Formify provides a variety of features to help you create and manage forms, including:

  • Dynamic Form Generation: Formify provides a clean and intuitive way to generate forms dynamically based on your data model.
  • Customizable Fields: Customize form fields, labels, icons, validation rules, and more to match your app's design and requirements.
  • Validation Rules: Easily apply built-in or custom validation rules to validate user input and provide meaningful error messages.
  • Real-time Validation: Formify performs real-time validation as users interact with the form, giving immediate feedback on the validity of their input.
  • Error Handling: Manage and display validation errors effortlessly, making it clear to users where corrections are needed.
  • Efficient State Management: Formify efficiently manages the state of your form fields, reducing the complexity of state management in Flutter apps.
  • Rich Text Editing: Support for various input types, including text, numeric, email, multiline, and more.
  • Password Toggling: Create password fields with toggleable visibility for user convenience.

Usage #

create a class that extends Family Forms, and prepare the attributes that will be used, you can use the following code:

class FormDemo extends FormifyForms {
  @override
  List<Attribute> get attributes => [
    FormifyAttribute('username'),
    FormifyAttribute('password', FormifyType.password),
  ];
}

The getWidgets() method returns a list of widgets that represent the form fields. You can use this method to add the form fields to your app.

For example, the following code would add the form fields to a Column widget:

...
Column(
  children: formDemo.getWidgets(),
)
...

You can also use the spread operator (...) to add the form fields to other widgets. For example, the following code would add the form fields to a Column widget:

...
Column(
  children: [
    ...formDemo.getWidgets(),
    FilledButton(
      onPressed: () {},
      child: const Text('Login'),
    ),
  ],
)
...

You can also create a horizontal form layout by using FormifyRowAttribute in conjunction with FormifyAttribute. Here's an example code snippet demonstrating how to achieve this:

class FormDemo extends FormifyForms {
  @override
  List<Attribute> get attributes => [
    FormifyAttribute('username'),
    FormifyAttribute('password', FormifyType.password),
    FormifyRowAttribute([
      FormifyAttribute('phone_number', FormifyType.phone),
      FormifyAttribute('email_address', FormifyType.email),
    ]),
  ];
}

Documentation #

Attribute Types #

class FormDemo extends FormifyForms {
  @override
  List<Attribute> get attributes => [
    FormifyAttribute('username'),
    FormifyAttribute('password', FormifyType.password),
  ];
}

This code defines a class called FormDemo that extends the FormifyForms class. The FormifyForms class is a base class that provides common functionality for all form fields. The attributes property is a map that maps attribute names to attribute values. In this case, the username attribute is set to the value FormifyType.text (if not defined) and the password attribute is set to the value FormifyType.password.

Type Description
FormifyType.text The default type. It returns a generic TextFormField.
FormifyType.numeric The keyboard that appears is a numeric keyboard.
FormifyType.password The obscureText property is set to true.
FormifyType.email The keyboard that appears is an email keyboard.
FormifyType.multiline The keyboard that appears is a multiline keyboard.
FormifyType.phone The keyboard that appears is a phone keyboard.
FormifyType.name The TextCapitalization property is set to TextCapitalization.words.

Custom Label #

By default, the label that will be displayed on a text form field will take the key of the attribute that was previously created, with underscores replaced by spaces and the first letter capitalized. For example, if the attribute is fist_name, the label will be First Name.

You can also customize the label by adding the labels property, as shown in the following example:

class FormDemo extends FormifyForms {
  @override
  List<Attribute> get attributes => [
    FormifyAttribute('username'),
    FormifyAttribute('password', FormifyType.password),
  ];
  
  @override
  Map<String, String> get labels => {
    'username': 'Username or Email Address',
  };
}

You don't need to define all of the attributes, just the ones you want to change.

Validation #

You can customize validation rules by adding the rules property, as shown in the following example:

...
@override
Map<String, List<FormifyRule>> get rules => {
  'username': [FormifyRule.required],
  'password': [FormifyRule.required, FormifyRule.min(5)],
};

The rules property is a map that maps attribute names to a list of validation rules. In this example, the username attribute is required and the password attribute is required and must be at least 5 characters long.

If the user enters an invalid value for an attribute, an error message will be displayed. The error message will be customized based on the validation rule. For example, if the user enters an empty value for the username attribute, the error message will be "Username is required."

The following is a list of the available validation rules:

Rule Example Description
required FormifyRule.required The field is required. The form will not be submitted if the field is empty.
numeric FormifyRule.numeric The field must be number.
integer FormifyRule.integer The field must be integer.
double FormifyRule.double The field must be double value.
between FormifyRule.between(1, 2) The field must be a number between 1 and 2.
min FormifyRule.min(10) The field must contain at least 10 characters.
max FormifyRule.max(10) The field must contain at most 10 characters.
gt FormifyRule.gt(10) The field must be a number greater than 10.
gte FormifyRule.gte(10) The field must be a number greater than or equal to 10.
lt FormifyRule.lt(10) The field must be a number less than 10.
lte FormifyRule.lte(10) The field must be a number less than or equal to 10.
starts_with FormifyRule.starts_with('mr') The field must start with the value 'mr'.
ends_with FormifyRule.ends_with('S.Kom') The field must end with the value 'S.Kom'.
same FormifyRule.same('good') The field must be the same as the value 'good'.
lowercase FormifyRule.lowercase The field must be lowercase.
uppercase FormifyRule.uppercase The field must be uppercase.
alpha_num FormifyRule.alphaNumeric The field must be string or number
email FormifyRule.email The field must be valid email address
ip FormifyRuleip The field must be valid IP address
url FormifyRule.url The field must be valid URL
in FormifyRule.inItems(['you','me','they']) The field must one in the list
not_in FormifyRule.notInItems(['you','me','they']) The field must not one in the list
regex FormifyRule.regEx(r"^dog") The field must match regex expression

You can also create custom validation rules by defining a class that extends FormifyRule and then adding it to your rules property. For example:

class MyPhoneValidation extends FormifyRule{
  @override
  String? call(String attribute, String value) {
    RegExp phoneNumberRegex = RegExp(r'^\+26\d{10,}$');
    if (!phoneNumberRegex.hasMatch(value)) {
      return '$attribute should start with +26 and minimum 12 digit';
    }
    return null;
  }
}

@override
Map<String, List<FormifyRule>> get rules => {
  'phone_number': [FormifyRule.required, MyPhoneValidation()],
};

You can further customize validation messages by utilizing the validationMessage property, This property allows you to define custom messages for specific validation rules. Simply include the validation rule followed by your desired message. The system will automatically replace placeholders such as :attribute and :input with the corresponding attribute name and user input. Additionally, you can use specific type placeholders like :number, :min, :max, :pattern, and :items to represent actual values.

...
@override
Map<String, String> get validationMessage => {
  'min': 'The :attribute must contain at least :number characters.'
  'between': 'The :attribute value :input is not between :min and :max.'
  'in': 'The :attribute is not between :min and :max.'
  'starts_with': 'The :attribute must start with :pattern'
};

By default, Formify will automatically validate your input. However, you can change this by adding the isAutoValidation property and setting it to false.

...
@override
bool get isAutoValidation => false;

Then, you can validate your form by calling the isFormValid() function. This function returns a bool, which you can use to decide what to do next.

FilledButton(
  onPressed: () {
    if(formDemo.isFormValid()){
      //DO SOMETHING
    }
  },
  child: const Text('Login'),
),

Manual Error Message #

You can manually set error message by call addErrorMessage, setErrorMessage, or setErrorMessages function, for example:

addErrorMessage append error message to existing list error message.

FilledButton(
  onPressed: () {
    formDemo.addErrorMessage('username', 'manual error message');
  },
  child: const Text('Login'),
),

setErrorMessage replace error message to existing one error message.

FilledButton(
  onPressed: () {
    formDemo.setErrorMessage('username', 'manual error message');
  },
  child: const Text('Login'),
),

setErrorMessages replace error message to existing list error message.

FilledButton(
  onPressed: () {
    formDemo.setErrorMessages('username', ['manual error message', 'manual error message too']);
  },
  child: const Text('Login'),
),

Customize Form Widget (InputDecoration) #

You can customize your text form field by adding the inputDecoration property and setting it to your desired values.

@override
InputDecoration? get inputDecoration =>
    const InputDecoration(
      border: OutlineInputBorder(),
      focusedBorder: OutlineInputBorder(
        borderSide: BorderSide(color: Colors.purple),
      ),
    );

Customize Form Widget (formBuilder) #

If you want to customize more deeply, you can do so by adding the formBuilder property. The form builder is a function that returns a widget and takes three parameters: BuildContext, Formify object, and FormifyTextField widget.

The Formify object allows you to get the following values:

  • attribute: The attribute key of the field
  • type: The FormifyType of the field
  • label: The label of the form
  • value: The value that has been entered
  • errors: The error values in a list of strings, if any
  • error: The error value in a string
  • isLoading: A boolean value that indicates if the form is in a loading state. This is typically used to make the form readonly when it is loading.
  • isRequired: A boolean value that indicates if the form is required, when its rules contain FormifyRule.required.
  • formKey: The GlobalKey<FormFieldState> of the form that you are modifying
  • controller: The TextEditingController of the form that you are modifying
  • keyboardType: The TextInputType of the form that you are modifying
  • textCapitalization: The TextCapitalization of the form that you are modifying
  • obscureText: The obscureText of the form that you are modifying
  • onChanged: function that can update the value of your form.
  • clearErrorMessages: function that can clear error message of your form.
  • toggleObscureText: function that can toggle obscureText of your form.

The FormifyTextField widget is a custom widget contain TextFormField widget. Because of that you can change its properties by using the copyWith(). the properties almost identical with TextFormField.

For example, if you want to make two different prefix icons for the username and password fields, you can modify the FormifyTextField with the copyWith() method and return it.

@override
FormifyFormBuilder? get formBuilder => (
    BuildContext context, 
    Formify formify, 
    FormifyTextField child,
) {
  if (formify.attribute == 'username') {
    return child.copyWith(prefixIcon: const Icon(Icons.person));
  }
  if (formify.attribute == 'password') {
    return child.copyWith(prefixIcon: const Icon(Icons.lock));
  }
  return child;
};

formBuilder allows you to create a completely new widget. The formBuilder function will be called whenever there is a change in the value, loading state, or error state for any of its attributes.

Customize Form Separator Widget #

Formify separates the form with a SizedBox with a height of 16. If you don't think this is suitable, you can modify it by adding the separatorBuilder property, as shown in the following example:

@override
FormifySeparatorBuilder? get separatorBuilder => (
  BuildContext context,
  Formify formify,
  Widget child,
) {
  return const SizedBox(height: 20);
};

Initial Value #

Let's say in the case of an edit form, you will need an initial value to fill in the initial value of your form. You can do this in two ways.

set initial value once at a time.

@override
void initState() {
  super.initState();
  formDemo.setInitialValue('username', 'thisismyusername');
}

set initial value once in bulk.

@override
void initState() {
  super.initState();
  formDemo.setInitialValues({
    'username': 'thisismyusername',
    'password': 'password',
  });
}
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Formify is a versatile and customizable form handling library for Flutter, designed to simplify the process of creating and managing forms in your Flutter applications

Repository (GitHub)
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Documentation

API reference

License

MIT (LICENSE)

Dependencies

flutter

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