CheckboxType Field
Warning: You are browsing the documentation for Symfony 3.x, which is no longer maintained.
Read the updated version of this page for Symfony 7.1 (the current stable version).
Creates a single input checkbox. This should always be used for a field that has a boolean value: if the box is checked, the field will be set to true, if the box is unchecked, the value will be set to false.
Rendered as | input checkbox field |
Options | |
Overridden options | |
Inherited options | |
Parent type | FormType |
Class | CheckboxType |
Example Usage
1 2 3 4 5 6 7
use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
// ...
$builder->add('public', CheckboxType::class, [
'label' => 'Show this entry publicly?',
'required' => false,
]);
Overridden Options
compound
type: boolean
default: false
This option specifies if a form is compound. As it's not the case for checkbox,
by default, the value is overridden with the false
value.
empty_data
type: string
default: mixed
This option determines what value the field will return when the placeholder
choice is selected. In the checkbox and the radio type, the value of empty_data
is overridden by the value returned by the data transformer (see How to Use Data Transformers).
Inherited Options
These options inherit from the FormType:
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:
1 2 3 4 5 6
use Symfony\Component\Form\Extension\Core\Type\HiddenType;
// ...
$builder->add('token', HiddenType::class, [
'data' => 'abcdef',
]);
Caution
The data
option always overrides the value taken from the domain data
(object) when rendering. This means the object value is also overridden when
the form edits an already persisted object, causing it to lose its
persisted value when the form is submitted.
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.
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:
1 2 3 4 5 6 7 8
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
orArrayAccess
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:
1 2 3 4 5
$resolver->setDefaults([
'error_mapping' => [
'.' => 'city',
],
]);
label
type: string
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. The label can also be directly set inside the template:
1
{{ form_label(form.name, 'Your name') }}
1 2 3 4
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:
1 2 3
{{ form_label(form.name, 'Your name', {
'label_attr': {'class': 'CUSTOM_LABEL_CLASS'}
}) }}
1 2 3 4 5
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:
1 2 3 4 5 6 7 8
// ...
$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.
Note
The label_format
option is evaluated in the form theme. Make sure to
update your templates in case you
customized form theming.
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.
Note
The required option also affects how empty data for each field is handled. For more details, see the empty_data option.
Form Variables
Variable | Type | Usage |
---|---|---|
checked | boolean |
Whether or not the current input is checked. |