function ModalForm::buildForm

Overrides FormInterface::buildForm

File

modules/form_api_example/src/Form/ModalForm.php, line 60

Class

ModalForm

Implements the ModalForm form controller.

Namespace

Code

public function buildForm(array $form, FormStateInterface $form_state, $nojs = NULL) {
    // Add the core AJAX library.
    $form['#attached']['library'][] = 'core/drupal.ajax';
    $form['description'] = [
        '#type' => 'item',
        '#markup' => $this->t('This example demonstrates a form that can work as a normal multi-request form, or as a modal dialog using AJAX.'),
    ];
    // Add a link to show this form in a modal dialog if we're not already in
    // one.
    if ($nojs == 'nojs') {
        $form['use_ajax_container'] = [
            '#type' => 'details',
            '#open' => TRUE,
        ];
        $form['use_ajax_container']['description'] = [
            '#type' => 'item',
            '#markup' => $this->t('In order to show a modal dialog by clicking on a link, that link has to have class <code>use-ajax</code> and <code>data-dialog-type="modal"</code>. This link has those attributes.'),
        ];
        $form['use_ajax_container']['use_ajax'] = [
            '#type' => 'link',
            '#title' => $this->t('See this form as a modal.'),
            '#url' => Url::fromRoute('form_api_example.modal_form', [
                'nojs' => 'ajax',
            ]),
            '#attributes' => [
                'class' => [
                    'use-ajax',
                ],
                'data-dialog-type' => 'modal',
                'data-dialog-options' => json_encode(static::getDataDialogOptions()),
                // Add this id so that we can test this form.
'id' => 'ajax-example-modal-link',
            ],
        ];
    }
    // This element is responsible for displaying form errors in the AJAX
    // dialog.
    if ($nojs == 'ajax') {
        $form['status_messages'] = [
            '#type' => 'status_messages',
            '#weight' => -999,
        ];
    }
    $form['title'] = [
        '#type' => 'textfield',
        '#title' => $this->t('Title'),
        '#required' => TRUE,
    ];
    // Group submit handlers in an actions element with a key of "actions" so
    // that it gets styled correctly, and so that other modules may add actions
    // to the form.
    $form['actions'] = [
        '#type' => 'actions',
    ];
    // Add a submit button that handles the submission of the form.
    $form['actions']['submit'] = [
        '#type' => 'submit',
        '#value' => $this->t('Submit'),
        '#ajax' => [
            'callback' => '::ajaxSubmitForm',
            'event' => 'click',
        ],
    ];
    // Set the form to not use AJAX if we're on a nojs path. When this form is
    // within the modal dialog, Drupal will make sure we're using an AJAX path
    // instead of a nojs one.
    if ($nojs == 'nojs') {
        unset($form['actions']['submit']['#ajax']);
    }
    return $form;
}