JavascriptStatesForm.php

<?php

namespace Drupal\form_test\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Builds a simple form to test states.
 *
 * @see \Drupal\FunctionalJavascriptTests\Core\Form\JavascriptStatesTest
 */
class JavascriptStatesForm extends FormBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'javascript_states_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['select'] = [
            '#type' => 'select',
            '#title' => 'select 1',
            '#options' => [
                0 => 0,
                1 => 1,
                2 => 2,
            ],
        ];
        $form['number'] = [
            '#type' => 'number',
            '#title' => 'enter 1',
        ];
        $form['textfield'] = [
            '#type' => 'textfield',
            '#title' => 'textfield',
            '#states' => [
                'visible' => [
                    [
                        ':input[name="select"]' => [
                            'value' => '1',
                        ],
                    ],
                    'or',
                    [
                        ':input[name="number"]' => [
                            'value' => '1',
                        ],
                    ],
                ],
            ],
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
    }

}