action

type: string default: empty string

This option specifies where to send the form's data on submission (usually a URI). Its value is rendered as the action attribute of the form element. An empty value is considered a same-document reference, i.e. the form will be submitted to the same URI that rendered the form.

allow_extra_fields

type: boolean default: false

Usually, if you submit extra fields that aren't configured in your form, you'll get a "This form should not contain extra fields." validation error.

You can silence this validation error by enabling the allow_extra_fields option on the form.

by_reference

type: boolean default: true

In most cases, if you have an author field, then you expect setAuthor() to be called on the underlying object. In some cases, however, setAuthor() may not be called. Setting by_reference to false ensures that the setter is called in all cases.

To explain this further, here's a simple example:

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use Symfony\Component\Form\Extension\Core\Type\EmailType;
use Symfony\Component\Form\Extension\Core\Type\FormType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
// ...

$builder = $this->createFormBuilder($article);
$builder
    ->add('title', TextType::class)
    ->add(
        $builder->create('author', FormType::class, ['by_reference' => ?])
            ->add('name', TextType::class)
            ->add('email', EmailType::class)
    )

If by_reference is true, the following takes place behind the scenes when you call submit() (or handleRequest()) on the form:

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$article->setTitle('...');
$article->getAuthor()->setName('...');
$article->getAuthor()->setEmail('...');

Notice that setAuthor() is not called. The author is modified by reference.

If you set by_reference to false, submitting looks like this:

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$article->setTitle('...');
$author = clone $article->getAuthor();
$author->setName('...');
$author->setEmail('...');
$article->setAuthor($author);

So, all that by_reference=false really does is that it clones the object, which enforces the framework to call the setter on the parent object.

Similarly, if you're using the CollectionType field where your underlying collection data is an object (like with Doctrine's ArrayCollection), then by_reference must be set to false if you need the adder and remover (e.g. addAuthor() and removeAuthor()) to be called.

compound

type: boolean default: true

A compound form can be either an entire <form> element or a group of form fields (rendered for example inside a <div> or <tr> container elements). Compound forms use the DataMapperInterface to initialize their children or to write back their submitted data.

A simple (non-compound) form is rendered as any of these HTML elements: <input> (TextType, FileType, HiddenType), <textarea> (TextareaType) or <select> (ChoiceType).

Some core types like date related types or the ChoiceType are simple or compound depending on other options (such as expanded or widget). They will either behave as a simple text field or as a group of text or choice fields.

constraints

type: array or Constraint default: null

Allows you to attach one or more validation constraints to a specific field. For more information, see Adding Validation. This option is added in the FormTypeValidatorExtension form extension.

data

type: mixed default: Defaults to field of the underlying structure.

When you create a form, each field initially displays the value of the corresponding property of the form's domain data (e.g. if you bind an object to the form). If you want to override this initial value for the form or an individual field, you can set it in the data option:

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use Symfony\Component\Form\Extension\Core\Type\HiddenType;
// ...

$builder->add('token', HiddenType::class, [
    'data' => 'abcdef',
]);

data_class

type: string

This option is used to set the appropriate data mapper to be used by the form, so you can use it for any form field type which requires an object:

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use App\Entity\Media;
use App\Form\MediaType;
// ...

$builder->add('media', MediaType::class, [
    'data_class' => Media::class,
]);

empty_data

type: mixed

The actual default value of this option depends on other field options:

• If data_class is set and required is true, then new $data_class();
• If data_class is set and required is false, then null;
• If data_class is not set and compound is true, then [] (empty array);
• If data_class is not set and compound is false, then '' (empty string).

This option determines what value the field will return when the submitted value is empty (or missing). It does not set an initial value if none is provided when the form is rendered in a view.

This means it helps you handling form submission with blank fields. For example, if you want the name field to be explicitly set to John Doe when no value is selected, you can do it like this:

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$builder->add('name', null, [
    'required'   => false,
    'empty_data' => 'John Doe',
]);

This will still render an empty text box, but upon submission the John Doe value will be set. Use the data or placeholder options to show this initial value in the rendered form.

If a form is compound, you can set empty_data as an array, object or closure. See the How to Configure empty Data for a Form Class article for more details about these options.

is_empty_callback

type: callable default: null

This callable takes form data and returns whether value is considered empty.

error_bubbling

type: boolean default: false unless the form is compound

If true, any errors for this field will be passed to the parent field or form. For example, if set to true on a normal field, any errors for that field will be attached to the main form, not to the specific field.

error_mapping

type: array default: []

This option allows you to modify the target of a validation error.

Imagine you have a custom method named matchingCityAndZipCode() that validates whether the city and zip code match. Unfortunately, there is no matchingCityAndZipCode field in your form, so all that Symfony can do is display the error on top of the form.

With customized error mapping, you can do better: map the error to the city field so that it displays above it:

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public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
        'error_mapping' => [
            'matchingCityAndZipCode' => 'city',
        ],
    ]);
}

Here are the rules for the left and the right side of the mapping:

• The left side contains property paths;
• If the violation is generated on a property or method of a class, its path is the propertyName;
• If the violation is generated on an entry of an array or ArrayAccess object, the property path is [indexName];
• You can construct nested property paths by concatenating them, separating properties by dots. For example: addresses[work].matchingCityAndZipCode;
• The right side contains the names of fields in the form.

By default, errors for any property that is not mapped will bubble up to the parent form. You can use the dot (.) on the left side to map errors of all unmapped properties to a particular field. For instance, to map all these errors to the city field, use:

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$resolver->setDefaults([
    'error_mapping' => [
        '.' => 'city',
    ],
]);

extra_fields_message

type: string default: This form should not contain extra fields.

This is the validation error message that's used if the submitted form data contains one or more fields that are not part of the form definition. The placeholder {{ extra_fields }} can be used to display a comma separated list of the submitted extra field names.

This message can be pluralized, see formatting pluralized messages for details.

form_attr

type: boolean or string default: false

When true and used on a form element, it adds a "form" attribute to its HTML field representation with its HTML form id. By doing this, a form element can be rendered outside the HTML form while still working as expected:

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$builder->add('body', TextareaType::class, [
    'form_attr' => true,
]);

This can be useful when you need to solve nested form problems. You can also set this to true on a root form to automatically set the "form" attribute on all its children.

getter

type: callable default: null

When provided, this callable will be invoked to read the value from the underlying object that will be used to populate the form field.

More details are available in the section on When and How to Use Data Mappers.

help

type: string or TranslatableInterface default: null

Allows you to define a help message for the form field, which by default is rendered below the field:

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use Symfony\Component\Translation\TranslatableMessage;

$builder
    ->add('zipCode', null, [
        'help' => 'The ZIP/Postal code for your credit card\'s billing address.',
    ])

    // ...

    ->add('status', null, [
        'help' => new TranslatableMessage('order.status', ['%order_id%' => $order->getId()], 'store'),
    ])
;

help_attr

type: array default: []

Sets the HTML attributes for the element used to display the help message of the form field. Its value is an associative array with HTML attribute names as keys. These attributes can also be set in the template:

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{{ form_help(form.name, 'Your name', {
    'help_attr': {'class': 'CUSTOM_LABEL_CLASS'}
}) }}

help_html

type: boolean default: false

By default, the contents of the help option are escaped before rendering them in the template. Set this option to true to not escape them, which is useful when the help contains HTML elements.

help_translation_parameters

type: array default: []

The content of the help option is translated before displaying it, so it can contain translation placeholders. This option defines the values used to replace those placeholders.

Given this translation message:

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# translations/messages.en.yaml
form.order.id.help: 'This will be the reference in communications with %company%'

You can specify the placeholder values as follows:

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$builder->add('id', null, [
    'help' => 'form.order.id.help',
    'help_translation_parameters' => [
        '%company%' => 'ACME Inc.',
    ],
]);

The help_translation_parameters option of children fields is merged with the same option of their parents, so children can reuse and/or override any of the parent placeholders.

inherit_data

type: boolean default: false

This option determines if the form will inherit data from its parent form. This can be useful if you have a set of fields that are duplicated across multiple forms. See How to Reduce Code Duplication with "inherit_data".

invalid_message

type: string default: This value is not valid

This is the validation error message that's used if the data entered into this field doesn't make sense (i.e. fails validation).

This might happen, for example, if the user enters a nonsense string into a TimeType field that cannot be converted into a real time or if the user enters a string (e.g. apple) into a number field.

Normal (business logic) validation (such as when setting a minimum length for a field) should be set using validation messages with your validation rules (reference).

invalid_message_parameters

type: array default: []

When setting the invalid_message option, you may need to include some variables in the string. This can be done by adding placeholders to that option and including the variables in this option:

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$builder->add('someField', SomeFormType::class, [
    // ...
    'invalid_message' => 'You entered an invalid value, it should include %num% letters',
    'invalid_message_parameters' => ['%num%' => 6],
]);

label_attr

type: array default: []

Sets the HTML attributes for the <label> element, which will be used when rendering the label for the field. It's an associative array with HTML attribute as a key. This attributes can also be directly set inside the template:

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{{ form_label(form.name, 'Your name', {
    'label_attr': {'class': 'CUSTOM_LABEL_CLASS'}
}) }}

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echo $view['form']->label(
    $form['name'],
    'Your name',
    ['label_attr' => ['class' => 'CUSTOM_LABEL_CLASS']]
);

label_format

type: string default: null

Configures the string used as the label of the field, in case the label option was not set. This is useful when using keyword translation messages.

If you're using keyword translation messages as labels, you often end up having multiple keyword messages for the same label (e.g. profile_address_street, invoice_address_street). This is because the label is built for each "path" to a field. To avoid duplicated keyword messages, you can configure the label format to a static value, like:

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// ...
$profileFormBuilder->add('address', AddressType::class, [
    'label_format' => 'form.address.%name%',
]);

$invoiceFormBuilder->add('invoice', AddressType::class, [
    'label_format' => 'form.address.%name%',
]);

This option is inherited by the child types. With the code above, the label of the street field of both forms will use the form.address.street keyword message.

Two variables are available in the label format:

%id%

A unique identifier for the field, consisting of the complete path to the field and the field name (e.g. profile_address_street);

%name%

The field name (e.g. street).

The default value (null) results in a "humanized" version of the field name.

mapped

type: boolean default: true

If you wish the field to be ignored when reading or writing to the object, you can set the mapped option to false.

method

type: string default: POST

This option specifies the HTTP method used to submit the form's data. Its value is rendered as the method attribute of the form element and is used to decide whether to process the form submission in the handleRequest() method after submission. Possible values are:

• POST
• GET
• PUT
• DELETE
• PATCH

post_max_size_message

type: string default: The uploaded file was too large. Please try to upload a smaller file.

This is the validation error message that's used if submitted POST form data exceeds php.ini's post_max_size directive. The {{ max }} placeholder can be used to display the allowed size.

property_path

type: PropertyPathInterface|string|null default: null

By default (when the value of this option is null) form fields read from and write to the properties with the same names in the form's domain object. The property_path option lets you define which property a field reads from and writes to. The value of this option can be any valid PropertyAccess syntax.

required

type: boolean default: true

If true, an HTML5 required attribute will be rendered. The corresponding label will also render with a required class.

This is superficial and independent of validation. At best, if you let Symfony guess your field type, then the value of this option will be guessed from your validation information.

setter

type: callable default: null

When provided, this callable will be invoked to map the form value back to the underlying object.

More details are available in the section on When and How to Use Data Mappers.

trim

type: boolean default: true

If true, the whitespace of the submitted string value will be stripped via the trim function when the data is bound. This guarantees that if a value is submitted with extra whitespace, it will be removed before the value is merged back onto the underlying object.

validation_groups

type: array, string, callable, GroupSequence or null default: null

This option is only valid on the root form and is used to specify which groups will be used by the validator.

For null the validator will just use the Default group.

If you specify the groups as an array or string they will be used by the validator as they are:

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public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
        'validation_groups' => 'Registration',
    ]);
}

This is equivalent to passing the group as array:

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'validation_groups' => ['Registration'],

The form's data will be validated against all given groups.

If the validation groups depend on the form's data a callable may be passed to the option. Symfony will then pass the form when calling it:

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use Symfony\Component\Form\FormInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

// ...
public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
        'validation_groups' => function (FormInterface $form): array {
            $entity = $form->getData();

            return $entity->isUser() ? ['User'] : ['Company'];
        },
    ]);
}

In some cases, you want to validate your groups step by step. To do this, you can pass a GroupSequence to this option. This enables you to validate against multiple groups, like when you pass multiple groups in an array, but with the difference that a group is only validated if the previous groups pass without errors. Here's an example:

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use Symfony\Component\Form\AbstractType;
use Symfony\Component\Validator\Constraints\GroupSequence;
// ...

class MyType extends AbstractType
{
    // ...
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'validation_groups' => new GroupSequence(['First', 'Second']),
        ]);
    }
}

attr

type: array default: []

If you want to add extra attributes to an HTML field representation you can use the attr option. It's an associative array with HTML attributes as keys. This can be useful when you need to set a custom class for some widget:

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$builder->add('body', TextareaType::class, [
    'attr' => ['class' => 'tinymce'],
]);

auto_initialize

type: boolean default: true

An internal option: sets whether the form should be initialized automatically. For all fields, this option should only be true for root forms. You won't need to change this option and probably won't need to worry about it.

block_name

type: string default: the form's name (see Knowing which block to customize)

Allows you to add a custom block name to the ones used by default to render the form type. Useful for example if you have multiple instances of the same form and you need to personalize the rendering of the forms individually.

If you set for example this option to my_custom_name and the field is of type text, Symfony will use the following names (and in this order) to find the block used to render the widget of the field: _my_custom_name_widget, text_widget and form_widget.

block_prefix

type: string or null default: null (see Knowing which block to customize)

Allows you to add a custom block prefix and override the block name used to render the form type. Useful for example if you have multiple instances of the same form and you need to personalize the rendering of all of them without the need to create a new form type.

disabled

type: boolean default: false

If you don't want a user to modify the value of a field, you can set the disabled option to true. Any submitted value will be ignored.

label

type: string or TranslatableMessage default: The label is "guessed" from the field name

Sets the label that will be used when rendering the field. Setting to false will suppress the label:

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use Symfony\Component\Translation\TranslatableMessage;

$builder
    ->add('zipCode', null, [
        'label' => 'The ZIP/Postal code',
        // optionally, you can use TranslatableMessage objects as the label content
        'label' => new TranslatableMessage('address.zipCode', ['%country%' => $country], 'address'),
    ])

The label can also be set in the template:

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{{ form_label(form.name, 'Your name') }}

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echo $view['form']->label(
    $form['name'],
    'Your name'
);

label_html

type: boolean default: false

By default, the contents of the label option are escaped before rendering them in the template. Set this option to true to not escape them, which is useful when the label contains HTML elements.

row_attr

type: array default: []

An associative array of the HTML attributes added to the element which is used to render the form type row:

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$builder->add('body', TextareaType::class, [
    'row_attr' => ['class' => 'text-editor', 'id' => '...'],
]);

translation_domain

type: string, null or false default: null

This is the translation domain that will be used for any label or option that is rendered for this field. Use null to reuse the translation domain of the parent form (or the default domain of the translator for the root form). Use false to disable translations.

label_translation_parameters

type: array default: []

The content of the label option is translated before displaying it, so it can contain translation placeholders. This option defines the values used to replace those placeholders.

Given this translation message:

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# translations/messages.en.yaml
form.order.id: 'Identifier of the order to %company%'

You can specify the placeholder values as follows:

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$builder->add('id', null, [
    'label' => 'form.order.id',
    'label_translation_parameters' => [
        '%company%' => 'ACME Inc.',
    ],
]);

The label_translation_parameters option of children fields is merged with the same option of their parents, so children can reuse and/or override any of the parent placeholders.

attr_translation_parameters

type: array default: []

The content of the title and placeholder values defined in the attr option is translated before displaying it, so it can contain translation placeholders. This option defines the values used to replace those placeholders.

Given this translation message:

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# translations/messages.en.yaml
form.order.id.placeholder: 'Enter unique identifier of the order to %company%'
form.order.id.title: 'This will be the reference in communications with %company%'

You can specify the placeholder values as follows:

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$builder->add('id', null, [
    'attr' => [
        'placeholder' => 'form.order.id.placeholder',
        'title' => 'form.order.id.title',
    ],
    'attr_translation_parameters' => [
        '%company%' => 'ACME Inc.',
    ],
]);

The attr_translation_parameters option of children fields is merged with the same option of their parents, so children can reuse and/or override any of the parent placeholders.

priority

type: integer default: 0

Fields are rendered in the same order as they are included in the form. This option changes the field rendering priority, allowing you to display fields earlier or later than their original order.

This option will affect the view order only. The higher this priority, the earlier the field will be rendered. Priority can also be negative and fields with the same priority will keep their original order.