HtmxTestAjaxForm.php

<?php

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

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\test_htmx\Controller\HtmxTestAttachmentsController;

/**
 * A small form used to insert an HTMX powered element using ajax API.
 */
class HtmxTestAjaxForm extends FormBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() : string {
        return 'htmx_test_ajax_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) : array {
        $build = [
            'ajax-button' => [
                '#type' => 'button',
                '#value' => 'Trigger Ajax',
                '#submit_button' => FALSE,
                '#ajax' => [
                    'callback' => [
                        HtmxTestAttachmentsController::class,
                        'generateHtmxButton',
                    ],
                    'wrapper' => 'ajax-test-container',
                ],
            ],
            '#suffix' => '<div id="ajax-test-container"></div>',
        ];
        return $build;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) : void {
    }

}