OpenModalDialogCommand

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Open Ajax Modal Dialog from Controller

Dialogs are often called dialog boxes, modal windows, or pop-up windows. 
Whatever you call them, they are a quick and easy way to display additional information without reloading the entire page. 
Dialog boxes can display just some static text, any node or form of your page, a views page, or any custom markup you'll feed them. 

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        public function requestResidenceUpload(Request $request): AjaxResponse {
            $arg = $request->get('arg1');
            
            // Add an AJAX command to open a modal dialog with the form as the content.      
            $response = new AjaxResponse();
            $modal_form = $this->formBuilder->getForm('Drupal\mymodule\Form\MyForm', $arg);
            $response->addCommand(new OpenModalDialogCommand('Upload', $modal_form, ['width' => 600, 'height'=>600]) );
            return $response;        
        }
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