compileFormFields

The compileFormFields hook is triggered when the fields of a form are compiled. It passes the form fields, the ID of the form and the form object as arguments and expects the modified form fields as return value.

Parameters

1. array $fields

   An array of \Contao\FormFieldModel instances.

2. string $formId

   Alias of the current form. Used in the value attribute of the hidden form field FORM_SUBMIT. Don’t confuse with $objForm->id.

3. \Contao\Form $form

   The form (an instance of \Contao\Form).

Return Values

An array of of \Contao\FormFieldModel instances.

Example

// src/EventListener/CompileFormFieldsListener.php
namespace App\EventListener;

use Contao\CoreBundle\DependencyInjection\Attribute\AsHook;
use Contao\Form;

#[AsHook('compileFormFields')]
class CompileFormFieldsListener
{
    public function __invoke(array $fields, string $formId, Form $form): array
    {
        // Modify $fields as needed

        return $fields;
    }
}

References

• \Contao\Form#L130-L138