ChoiceType Field (select Drop-downs, Radio Buttons & Checkboxes)

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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:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 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)]; }, ]);

Tip

When defining a custom type, you should use the ChoiceList class helper:

1 2 3 4 5 6 7 8 9 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()] : []; }), ]);

See the "choice_loader" option documentation.

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