SetDialogTitleCommand.php

<?php

namespace Drupal\Core\Ajax;


/**
 * Defines an AJAX command that sets jQuery UI dialog properties.
 *
 * @ingroup ajax
 */
class SetDialogTitleCommand extends SetDialogOptionCommand {
    
    /**
     * Constructs a SetDialogTitleCommand object.
     *
     * @param string $selector
     *   The selector of the dialog whose title will be set. If set to an empty
     *   value, the default modal dialog will be selected.
     * @param string $title
     *   The title that will be set on the dialog.
     */
    public function __construct($selector, $title) {
        $this->selector = $selector ? $selector : '#drupal-modal';
        $this->optionName = 'title';
        $this->optionValue = $title;
    }

}