Edit file File name : EnhancedSelectboxType.php Content :<?php /* * This file is part of the Kimai time-tracking app. * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace App\Form\Type; use Symfony\Component\Form\AbstractType; use Symfony\Component\Form\Extension\Core\Type\ChoiceType; use Symfony\Component\OptionsResolver\OptionsResolver; /** * Custom form field type to select the javascript renderer for select boxes. */ class EnhancedSelectboxType extends AbstractType { /** * {@inheritdoc} */ public function configureOptions(OptionsResolver $resolver) { $resolver->setDefaults([ 'label' => 'label.select_type', 'choices' => [ '' => '', 'Javascript' => 'selectpicker', ], 'required' => false, ]); } /** * {@inheritdoc} */ public function getParent() { return ChoiceType::class; } } Save