BatchTestSimpleForm.php

<?php

declare (strict_types=1);
namespace Drupal\batch_test\Form;

use Drupal\batch_test\BatchTestDefinitions;
use Drupal\batch_test\BatchTestHelper;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Generate form of id batch_test_simple_form.
 *
 * @internal
 */
class BatchTestSimpleForm extends FormBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'batch_test_simple_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['batch'] = [
            '#type' => 'select',
            '#title' => 'Choose batch',
            '#options' => [
                'batch0' => 'batch 0',
                'batch1' => 'batch 1',
                'batch2' => 'batch 2',
                'batch3' => 'batch 3',
                'batch4' => 'batch 4',
                'batch6' => 'batch 6',
                'batch7' => 'batch 7',
                'batch8' => 'batch 8',
            ],
            '#multiple' => TRUE,
        ];
        $form['submit'] = [
            '#type' => 'submit',
            '#value' => 'Submit',
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $batch_test_definitions = new BatchTestDefinitions();
        $batch_test_helper = new BatchTestHelper();
        $batch_test_helper->stack(NULL, TRUE);
        foreach ($form_state->getValue('batch') as $batch) {
            batch_set($batch_test_definitions->{$batch}());
        }
        $form_state->setRedirect('batch_test.redirect');
    }

}