EnumType Field

class

type: string default: (it has no default)

The fully-qualified class name (FQCN) of the PHP enum used to get the values displayed by this form field.

choice_attr

type: array, callable, string or PropertyPath default: []

Use this to add additional HTML attributes to each choice. This can be an associative array where the keys match the choice keys and the values are the attributes for each choice, a callable or a property path (just like choice_label).

If an array, the keys of the choices array must be used as keys:

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

$builder->add('fruits', ChoiceType::class, [
    'choices' => [
        'Apple' => 1,
        'Banana' => 2,
        'Durian' => 3,
    ],
    'choice_attr' => [
        'Apple' => ['data-color' => 'Red'],
        'Banana' => ['data-color' => 'Yellow'],
        'Durian' => ['data-color' => 'Green'],
    ],
]);

// or use a callable
$builder->add('attending', ChoiceType::class, [
    'choices' => [
        'Yes' => true,
        'No' => false,
        'Maybe' => null,
    ],
    'choice_attr' => function ($choice, string $key, mixed $value) {
        // adds a class like attending_yes, attending_no, etc
        return ['class' => 'attending_'.strtolower($key)];
    },
]);

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use App\Entity\Category;
use Symfony\Component\Form\ChoiceList\ChoiceList;

// ...
$builder->add('choices', ChoiceType::class, [
    'choice_attr' => ChoiceList::attr($this, function (?Category $category): array {
        return $category ? ['data-uuid' => $category->getUuid()] : [];
    }),
]);

choice_filter

type: callable, string or PropertyPath default: null

When using predefined choice types from Symfony core or vendor libraries (i.e. CountryType) this option lets you define a callable that takes each choice as the only argument and must return true to keep it or false to discard it:

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// src/Form/Type/AddressType.php
namespace App\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\CountryType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class AddressType extends AbstractType
{
    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver
            ->setDefaults([
                // enable this type to accept a limited set of countries
                'allowed_countries' => null,
            ])
        ;
    }

    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $allowedCountries = $options['allowed_countries'];

        $builder
            // ...
            ->add('country', CountryType::class, [
                // if the AddressType "allowed_countries" option is passed,
                // use it to create a filter
                'choice_filter' => $allowedCountries ? function ($countryCode) use ($allowedCountries): bool {
                    return in_array($countryCode, $allowedCountries, true);
                } : null,

            ])
        ;
    }

The option can be a callable or a property path when choices are objects:

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// ...
$builder
    ->add('category', ChoiceType::class, [
        // ...
        'choice_filter' => 'isSelectable',
    ])
;

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// src/Form/Type/AddressType.php
// ...
use Symfony\Component\Form\ChoiceList\ChoiceList;

// ...
'choice_filter' => $allowedCountries ? ChoiceList::filter(
    // pass the type as first argument
    $this,
    function (string $countryCode) use ($allowedCountries): bool {
        return in_array($countryCode, $allowedCountries, true);
    },
    // pass the option that makes the filter "vary" to compute a unique hash
    $allowedCountries
) : null,
// ...

choice_label

type: string, callable, false or PropertyPath default: null

By default, the array key of each item in the choices option is used as the text that's shown to the user. The choice_label option allows you to take more control:

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

$builder->add('attending', ChoiceType::class, [
    'choices' => [
        'yes' => true,
        'no' => false,
        'maybe' => null,
    ],
    'choice_label' => function ($choice, string $key, mixed $value): TranslatableMessage|string {
        if (true === $choice) {
            return 'Definitely!';
        }

        return strtoupper($key);

        // or if you want to translate some key
        //return 'form.choice.'.$key;
        //return new TranslatableMessage($key, false === $choice ? [] : ['%status%' => $value], 'store');
    },
]);

This method is called for each choice, passing you the $choice and $key from the choices array (additional $value is related to choice_value). This will give you:

If your choice values are objects, then choice_label can also be a property path. Imagine you have some Status class with a getDisplayName() method:

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

$builder->add('attending', ChoiceType::class, [
    'choices' => [
        new Status(Status::YES),
        new Status(Status::NO),
        new Status(Status::MAYBE),
    ],
    'choice_label' => 'displayName',
]);

If set to false, all the tag labels will be discarded for radio or checkbox inputs. You can also return false from the callable to discard certain labels.

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use Symfony\Component\Form\ChoiceList\ChoiceList;

// ...
$builder->add('choices', ChoiceType::class, [
    'choice_label' => ChoiceList::label($this, 'displayName'),
]);

choice_loader

type: ChoiceLoaderInterface

The choice_loader option can be used instead of the choices option. It allows to create a list lazily or partially when fetching only the choices for a set of submitted values (i.e. querying a search engine like ElasticSearch can be a heavy process).

You can use an instance of CallbackChoiceLoader if you want to take advantage of lazy loading:

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use App\StaticClass;
use Symfony\Component\Form\ChoiceList\Loader\CallbackChoiceLoader;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
// ...

$builder->add('loaded_choices', ChoiceType::class, [
    'choice_loader' => new CallbackChoiceLoader(static function (): array {
        return StaticClass::getConstants();
    }),
]);

This will cause the call of StaticClass::getConstants() to not happen if the request is redirected and if there is no pre set or submitted data. Otherwise the choice options would need to be resolved thus triggering the callback.

If the built-in CallbackChoiceLoader doesn't fit your needs, you can create your own loader by implementing the ChoiceLoaderInterface or by extending the AbstractChoiceLoader. This abstract class saves you some boilerplate by implementing some methods of the interface so you'll only have to implement the loadChoices() method to have a fully functional choice loader.

When you're defining a custom choice type that may be reused in many fields (like entries of a collection) or reused in multiple forms at once, you should use the ChoiceList static methods to wrap the loader and make the choice list cacheable for better performance:

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use App\Form\ChoiceList\CustomChoiceLoader;
use App\StaticClass;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\ChoiceList\ChoiceList;
use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\OptionsResolver\Options;
use Symfony\Component\OptionsResolver\OptionsResolver;

class ConstantsType extends AbstractType
{
    public function getParent(): string
    {
        return ChoiceType::class;
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            // the example below will create a CallbackChoiceLoader from the callable
            'choice_loader' => ChoiceList::lazy($this, function () {
                return StaticClass::getConstants();
            }),

            // you can pass your own loader as well, depending on other options
            'some_key' => null,
            'choice_loader' => function (Options $options): ChoiceLoaderInterface {
                return ChoiceList::loader(
                    // pass the instance of the type or type extension which is
                    // currently configuring the choice list as first argument
                    $this,
                    // pass the other option to the loader
                    new CustomChoiceLoader($options['some_key']),
                    // ensure the type stores a loader per key
                    // by using the special third argument "$vary"
                    // an array containing anything that "changes" the loader
                    [$options['some_key']]
                );
            },
        ]);
    }
}

choice_name

type: callable, string or PropertyPath default: null

Controls the internal field name of the choice. You normally don't care about this, but in some advanced cases, you might. For example, this "name" becomes the index of the choice views in the template and is used as part of the field name attribute.

This can be a callable or a property path. See choice_label for similar usage. By default, the choice key or an incrementing integer may be used (starting at 0).

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use Symfony\Component\Form\ChoiceList\ChoiceList;

// ...
$builder->add('choices', ChoiceType::class, [
    'choice_name' => ChoiceList::fieldName($this, 'name'),
]);

choice_translation_domain

type: string, boolean or null default: true

This option determines if the choice values should be translated and in which translation domain.

The values of the choice_translation_domain option can be true (reuse the current translation domain), false (disable translation), null (uses the parent translation domain or the default domain) or a string which represents the exact translation domain to use.

choice_translation_parameters

type: array, callable, string or PropertyPath default: []

The choice values are translated before displaying it, so it can contain translation placeholders. This option defines the values used to replace those placeholders. This can be an associative array where the keys match the choice keys and the values are the attributes for each choice, a callable or a property path (just like choice_label).

Given this translation message:

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# translations/messages.en.yaml
form.order.yes: 'I confirm my order to the company %company%'
form.order.no: 'I cancel my order'

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<!-- translations/messages.en.xlf -->
<?xml version="1.0"?>
<xliff version="1.2" xmlns="urn:oasis:names:tc:xliff:document:1.2">
    <file source-language="en" datatype="plaintext" original="file.ext">
        <body>
        <trans-unit id="form.order.yes">
            <source>form.order.yes</source>
            <target>I confirm my order to the company %company%</target>
        </trans-unit>
        <trans-unit id="form.order.no">
            <source>form.order.no</source>
            <target>I cancel my order</target>
        </trans-unit>
        </body>
    </file>
</xliff>

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// translations/messages.fr.php
return [
    'form.order.yes' => "I confirm my order to the company %company%",
    'form.order.no' => "I cancel my order",
];

You can specify the placeholder values as follows:

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$builder->add('id', null, [
    'choices' => [
        'form.order.yes' => true,
        'form.order.no' => false,
    ],
    'choice_translation_parameters' => function ($choice, string $key, mixed $value): array {
        if (false === $choice) {
            return [];
        }

        return ['%company%' => 'ACME Inc.'];
    },
]);

If an array, the keys of the choices array must be used as keys:

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$builder->add('id', null, [
    'choices' => [
        'form.order.yes' => true,
        'form.order.no' => false,
    ],
    'choice_translation_parameters' => [
        'form.order.yes' => ['%company%' => 'ACME Inc.'],
        'form.order.no' => [],
    ],
]);

The translation parameters of child fields are merged with the same option of their parents, so children can reuse and/or override any of the parent placeholders.

choice_value

type: callable, string or PropertyPath default: null

Returns the string "value" for each choice, which must be unique across all choices. This is used in the value attribute in HTML and submitted in the POST/PUT requests. You don't normally need to worry about this, but it might be handy when processing an API request (since you can configure the value that will be sent in the API request).

This can be a callable or a property path. By default, the choices are used if they can be casted to strings. Otherwise an incrementing integer is used (starting at 0).

If you pass a callable, it will receive one argument: the choice itself. When using the EntityType Field, the argument will be the entity object for each choice or null in a placeholder is used, which you need to handle:

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'choice_value' => function (?MyOptionEntity $entity): string {
    return $entity ? $entity->getId() : '';
},

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use Symfony\Component\Form\ChoiceList\ChoiceList;

// ...
$builder->add('choices', ChoiceType::class, [
    'choice_value' => ChoiceList::value($this, 'uuid'),
]);

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): void
{
    $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',
    ],
]);

expanded

type: boolean default: false

If set to true, radio buttons or checkboxes will be rendered (depending on the multiple value). If false, a select element will be rendered.

group_by

type: string or callable or PropertyPath default: null

You can group the <option> elements of a <select> into <optgroup> by passing a multi-dimensional array to choices. See the Grouping Options section about that.

The group_by option is an alternative way to group choices, which gives you a bit more flexibility.

Let's add a few cases to our TextAlign enumeration:

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// src/Config/TextAlign.php
namespace App\Config;

enum TextAlign: string
{
    case UpperLeft = 'Upper Left aligned';
    case LowerLeft = 'Lower Left aligned';

    case Center = 'Center aligned';

    case UpperRight = 'Upper Right aligned';
    case LowerRight = 'Lower Right aligned';
}

We can now group choices by the enum case value:

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use App\Config\TextAlign;
use Symfony\Component\Form\Extension\Core\Type\EnumType;
// ...

$builder->add('alignment', EnumType::class, [
    'class' => TextAlign::class,
    'group_by' => function(TextAlign $choice, int $key, string $value): ?string {
        if (str_starts_with($value, 'Upper')) {
            return 'Upper';
        }

        if (str_starts_with($value, 'Lower')) {
            return 'Lower';
        }

        return 'Other';
    }
]);

This callback will group choices in 3 categories: Upper, Lower and Other.

If you return null, the option won't be grouped.

duplicate_preferred_choices

type: boolean default: true

When using the preferred_choices option, those preferred choices are displayed twice by default: at the top of the list and in the full list below. Set this option to false, to only display preferred choices at the top of the list:

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

$builder->add('language', ChoiceType::class, [
    'choices' => [
        'English' => 'en',
        'Spanish' => 'es',
        'Bork' => 'muppets',
        'Pirate' => 'arr',
    ],
    'preferred_choices' => ['muppets', 'arr'],
    'duplicate_preferred_choices' => false,
]);

multiple

type: boolean default: false

If true, the user will be able to select multiple options (as opposed to choosing just one option). Depending on the value of the expanded option, this will render either a select tag or checkboxes if true and a select tag or radio buttons if false. The returned value will be an array.

placeholder

type: string or TranslatableMessage or boolean

This option determines whether or not a special "empty" option (e.g. "Choose an option") will appear at the top of a select widget. This option only applies if the multiple option is set to false.

• Add an empty value with "Choose an option" as the text:

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  use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
  // ...
  
  $builder->add('states', ChoiceType::class, [
      'placeholder' => 'Choose an option',
  
      // or if you want to translate the text
      'placeholder' => new TranslatableMessage('form.placeholder.select_option', [], 'form'),
  ]);

• Guarantee that no "empty" value option is displayed:

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  use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
  // ...
  
  $builder->add('states', ChoiceType::class, [
      'placeholder' => false,
  ]);

If you leave the placeholder option unset, then a blank (with no text) option will automatically be added if and only if the required option is false:

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

// a blank (with no text) option will be added
$builder->add('states', ChoiceType::class, [
    'required' => false,
]);

placeholder_attr

type: array default: []

Use this to add additional HTML attributes to the placeholder choice:

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

$builder->add('fruits', ChoiceType::class, [
    // ...
    'placeholder' => '...',
    'placeholder_attr' => [
        ['title' => 'Choose an option'],
    ],
]);

preferred_choices

type: array, callable, string or PropertyPath default: []

This option allows you to display certain choices at the top of your list with a visual separator between them and the complete list of options. If you have a form of languages, you can list the most popular on top, like Bork and Pirate:

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

$builder->add('language', ChoiceType::class, [
    'choices' => [
        'English' => 'en',
        'Spanish' => 'es',
        'Bork' => 'muppets',
        'Pirate' => 'arr',
    ],
    'preferred_choices' => ['muppets', 'arr'],
]);

This options can also be a callback function to give you more flexibility. This might be especially useful if your values are objects:

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

$builder->add('publishAt', ChoiceType::class, [
    'choices' => [
        'now' => new \DateTime('now'),
        'tomorrow' => new \DateTime('+1 day'),
        '1 week' => new \DateTime('+1 week'),
        '1 month' => new \DateTime('+1 month'),
    ],
    'preferred_choices' => function ($choice, $key, $value): bool {
        // prefer options within 3 days
        return $choice <= new \DateTime('+3 days');
    },
]);

This will "prefer" the "now" and "tomorrow" choices only:

Finally, if your values are objects, you can also specify a property path string on the object that will return true or false.

The preferred choices are only meaningful when rendering a select element (i.e. expanded false). The preferred choices and normal choices are separated visually by a set of dotted lines (i.e. -------------------). This can be customized when rendering the field:

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{{ form_widget(form.publishAt, { 'separator': '=====' }) }}

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<?= $view['form']->widget($form['publishAt'], [
    'separator' => '=====',
]) ?>

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use Symfony\Component\Form\ChoiceList\ChoiceList;

// ...
$builder->add('choices', ChoiceType::class, [
    'preferred_choices' => ChoiceList::preferred($this, 'taggedAsFavorite'),
]);

trim

type: boolean default: false

Trimming is disabled by default because the selected value or values must match the given choice values exactly (and they could contain whitespaces).

These options inherit from the FormType:

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'],
]);

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',
]);

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.

empty_data

type: mixed

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.

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.

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_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_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.

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.

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.

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' => '...'],
]);