Zend FR

$(document).ready(function(){
    $(".test").on("keyup",function(event){  //quand on entre du texte dans le champ 'test'    
        $.ajax({
            url:        '/ajax/index', // j'appaelle la fonction index du controller ajax
            type:       'POST',
            dataType:   'json',
            async:      true,
            data:       $(".test").serialize(),
            success: function(data, status)
            {           
                alert('je suis ici'); // j'affiche le pop up
            },
            error : function(xhr, textStatus, errorThrown) {
                if (xhr.status === 0) {
                    alert('Not connected. Verify Network.');
                } else if (xhr.status == 404) {
                    alert('Requested page not found. [404]');
                } else if (xhr.status == 500) {
                    alert('Server Error [500].');
                } else if (errorThrown === 'parsererror') {
                    alert('Requested JSON parse failed.');
                } else if (errorThrown === 'timeout') {
                    alert('Time out error.');
                } else if (errorThrown === 'abort') {
                    alert('Ajax request aborted.');
                } else {           
                    alert('Remote sever unavailable. Please try later');
                }
            }
        });
    });
});

[lang=php]namespace Ajax\Controller;

 use Zend\Mvc\Controller\AbstractActionController;
 use Zend\View\Model\ViewModel;
 use Zend\View\Model\JsonModel;
 use Zend\View\Renderer\PhpRenderer;
 use Ajax\Form\AjaxForm;
 use Ajax\Model\Ajax;

 class AjaxController extends AbstractActionController
 {
     public function indexAction()
     {
         // Permet d'ajouter le script
         $renderer = $this->serviceLocator->get('Zend\View\Renderer\RendererInterface');
         $renderer->headScript()->appendFile('/js/ajax.js');
         
         $form = new AjaxForm();
         $request = $this->getRequest();
         
         return array(
             'form' => $form,
         );
     }

        //ma fonction 
        public function testAction()
    {
        $request = $this->getRequest();
        if ($request->isXmlHttpRequest())
        {
            $retour ="azerty"; //  pour le test
            if (empty( $errorArray))
            {
                $view = new JsonModel(array(
                        'retour' =>$retour,//j'envoi la variable $retour
                        'success'=>true,
                ));
            }
            else
            {
                $view = new JsonModel( $errorArray);
            }
            $view->setTerminal(true);
        }
        return($view);
    }
 }

try {
// Do send the request (this may raise an exception)
    xhr.send( options.hasContent && options.data || null );
    } catch ( e ) {
    // #14683: Only rethrow if this hasn't been notified as an error yet
    if ( callback ) {
        throw e;
    }
}