Method renderButton

/**
 * Render button HTML.
 *
 * @param   array  $options  The button options.
 *
 * @return  string  The button HTML.
 *
 * @since   4.0.0
 */
protected function renderButton(array &$options) : string
{
    $html = [];
    $html[] = parent::renderButton($options);
    if ((string) $this->getUrl() !== '') {
        // Build the options array for the modal
        $params = array();
        $params['title'] = $options['title'] ?? $options['text'];
        $params['url'] = $this->getUrl();
        $params['height'] = $options['iframeHeight'] ?? 480;
        $params['width'] = $options['iframeWidth'] ?? 640;
        $params['bodyHeight'] = $options['bodyHeight'] ?? null;
        $params['modalWidth'] = $options['modalWidth'] ?? null;
        // Place modal div and scripts in a new div
        $html[] = '<div class="btn-group" style="width: 0; margin: 0; padding: 0;">';
        $selector = $options['selector'];
        $footer = $this->getFooter();
        if ($footer !== null) {
            $params['footer'] = $footer;
        }
        $html[] = HTMLHelper::_('bootstrap.renderModal', $selector, $params);
        $html[] = '</div>';
        // We have to move the modal, otherwise we get problems with the backdrop
        // @todo: There should be a better workaround than this
        Factory::getDocument()->addScriptDeclaration(<<<JS
document.addEventListener('DOMContentLoaded', function() {
  var modal =document.getElementById('{$options['selector']}');
  document.body.appendChild(modal);
  if (Joomla && Joomla.Bootstrap && Joomla.Bootstrap.Methods && Joomla.Bootstrap.Methods.Modal) {
    Joomla.Bootstrap.Methods.Initialise.Modal(modal);
  }
});
JS
);
    }
    // If an $onClose event is passed, add it to the modal JS object
    if ((string) $this->getOnclose() !== '') {
        Factory::getDocument()->addScriptDeclaration(<<<JS
document.addEventListener('DOMContentLoaded', function() {
\tdocument.querySelector('#{$options['selector']}').addEventListener('hide.bs.modal', function() {
\t    {$options['onclose']}
\t});
});
JS
);
    }
    return implode("\n", $html);
}