Making JSON Objects from Zend Controllers Using JQuery in ZF2

Question

I am new in Zend Framework. I am trying to display data from database using JSON. And I encoded the data and passed it to JQuery. But cannot retrieve value from database. Data displayed as "undefined". My controller function is as follows:

 public function displayAction() 
 {
    $data1 = array();
    $request = $this->getRequest();
    $response = $this->getResponse();
    if ($request->isPost()) {
       $response->setContent(\Zend\Json\Json::encode(array('data' => $this-> getStickyNotesTable() -> fetchAll())));
}
    return $response; 
}

My FetchAll() is:

 public function fetchAll() {
    $resultSet = $this->select(function (Select $select) {
                $select->order('created ASC');
            });
    $entities = array();
    foreach ($resultSet as $row) {
        $entity = new Entity\StickyNote();
        $entity->setId($row->id)
                ->setNote($row->note)
                ->setCreated($row->created);
        $entities[] = $entity;
    }
    return $entities;

}

JQuery function :

function getUserList(element) {

$('#indicator').show();

$.post('stickynotes/display',
    function(data, textStatus) {
        renderUserList(data);
        $('#indicator').hide();
    }, 
    "json"      
);

}

function renderUserList(jsonData) {
var table = '<table width="600" cellpadding="5" class="table table-hover table-bordered"><thead><tr><th scope="col">Note</th></tr></thead><tbody>';

$.each(jsonData, function(index, data){    
    table += '<tr>';
    table += '<td class="edit" field="note" user_id="'+data.id+'">'+data.note+'</td>';
    table += '<td><a href="javascript:void(0);" user_id="'+data.id+'" class="delete_confirm btn btn-danger"><i class="icon-remove icon-white"></i></a></td>';
    table += '</tr>';
    });

table += '</tbody></table>';

$('div#content').html(table);
}

I tested it using Firebug. It shows

{"data":[{},{},{},{},{},{},{},{},{},{},{},{},{}]} 

as Response. Anyone please help me. Thanks.

Answer 1

You'll need to configure your module.config.php and add a strategy within your template_map add.

'strategies' => array(
        'ViewJsonStrategy',
    ),

to return a jsonModel.

If you want to work with a jsonModel within your controller you'll need to call it like so:

    $json = new JsonModel(array(
    'param'   => 'foobar',
    'success' => true,
    ));

    return $json;

Answer 2

The issue is with your fetchAll method. Try with this updated version:

public function fetchAll() {
    $resultSet = $this->select(function (Select $select) {
        $select->order('created ASC');
    });
    $entities = array();
    foreach ($resultSet as $row) {
        $entity = array(
            "id"      => $row->id,
            "note"    => $row->note,
            "created" => $row->created
        );
        $entities[] = $entity;
    }
    return $entities; 
}