jQuery Ajax success function returns null?

Question

I use the following the jquery statements to call my php controller function, it gets called but my result is not returned to my success function....

<html>
    <head>
        <link rel="stylesheet" type="text/css" href="http://localhost/codeigniter_cup_myth/stylesheets/style.css" />
        <link rel="stylesheet" type="text/css" href="http://localhost/codeigniter_cup_myth/stylesheets/calendar.css" />
        <link rel="stylesheet" type="text/css" href="http://localhost/codeigniter_cup_myth/stylesheets/date_picker.css" />
        <script type="text/javascript" src="http://localhost/codeigniter_cup_myth/javascript/jquery1.4.2.js"></script>
        <script type="text/javascript" src="http://localhost/codeigniter_cup_myth/javascript/jquery.pagination.js"></script>
        <script type="text/javascript">
            $(document).ready(function() {
                getRecordspage();
            });

            function getRecordspage() {
                $.ajax({
                    type: "POST",
                    url:"http://localhost/codeigniter_cup_myth/index.php/adminController/mainAccount",
                    data: "{}",
                    contentType: "application/json; charset=utf-8",
                    global:false,
                    async: true,
                    dataType: "json",
                    success: function(result) {
                        alert(result);
                    }
                });
            }
        </script>
    </head>
    <body>
        <table  id="chkbox" cellpadding="0" cellspacing="2" width="100%" class="table_Style_Border">
            <tr>
                <td class="grid_header" align="center">S.No</td>
                <td class="grid_header" align="center">Account Name</td>
                <td class="grid_header" align="center">Account Acronym</td>
                <td class="grid_header" align="center">Finance Year Start</td>
                <td class="grid_header" align="center">Finance Year End</td>
                <td class="grid_header" align="center">&nbsp;</td>
            </tr>
            <tr> <td colspan="5"> </td></tr>
        </table>
    </body>
</html>

My controller method,

function mainAccount()
{
    $_SESSION['menu'] = 'finance';
    $data['account'] = $this->adminmodel->getaccountDetails();
    if(empty($data['account']))
    {
        $data['comment'] = 'No record found !';
    }
    $json = json_encode($data);
    return $json;
}

I get the alert(1); in my success function but my alert(result); show null. How do I fix this problem?

This was what I got when I gave print_r($data);:

Array ( [account] => Array ( [0] => Array ( [dAcc_id] => 1 [dAccountName] => Govt. College Of Technology [dAccountAcronym] => GCT [dFromDate] => 2010-04-02 [dToDate] => 2011-05-03 ) [1] => Array ( [dAcc_id] => 3 [dAccountName] => sample4 [dAccountAcronym] => smp_4 [dFromDate] => 2010-03-17 [dToDate] => 2011-03-03 ) [2] => Array ( [dAcc_id] => 4 [dAccountName] => sample3 [dAccountAcronym] => smp_3 [dFromDate] => 2010-03-16 [dToDate] => 2011-03-17 ) [3] => Array ( [dAcc_id] => 5 [dAccountName] => sample5 [dAccountAcronym] => smp_5 [dFromDate] => 2010-03-12 [dToDate] => 2011-03-03 ) [4] => Array ( [dAcc_id] => 6 [dAccountName] => sample2 [dAccountAcronym] => smp2 [dFromDate] => 2010-03-01 [dToDate] => 2011-03-16 ) [5] => Array ( [dAcc_id] => 7 [dAccountName] => sample1 [dAccountAcronym] => smp_1 [dFromDate] => 2010-03-11 [dToDate] => 2011-03-03 ) [6] => Array ( [dAcc_id] => 8 [dAccountName] => ss [dAccountAcronym] => ss [dFromDate] => 2010-04-04 [dToDate] => 2010-04-06 ) ) )

When I did print_r(json_encode($data['account']));, I got this:

[{"dAcc_id":"1","dAccountName":"Govt. College Of Technology","dAccountAcronym":"GCT","dFromDate":"2010-04-02","dToDate":"2011-05-03"},{"dAcc_id":"3","dAccountName":"sample4","dAccountAcronym":"smp_4","dFromDate":"2010-03-17","dToDate":"2011-03-03"},{"dAcc_id":"4","dAccountName":"sample3","dAccountAcronym":"smp_3","dFromDate":"2010-03-16","dToDate":"2011-03-17"},{"dAcc_id":"5","dAccountName":"sample5","dAccountAcronym":"smp_5","dFromDate":"2010-03-12","dToDate":"2011-03-03"},{"dAcc_id":"6","dAccountName":"sample2","dAccountAcronym":"smp2","dFromDate":"2010-03-01","dToDate":"2011-03-16"},{"dAcc_id":"7","dAccountName":"sample1","dAccountAcronym":"smp_1","dFromDate":"2010-03-11","dToDate":"2011-03-03"},{"dAcc_id":"8","dAccountName":"ss","dAccountAcronym":"ss","dFromDate":"2010-04-04","dToDate":"2010-04-06"}]

The result body can be null and still be a valid result if the header is 200 OK. Have you checked your URL actually returns something? — Pekka
– Pekka, Commented Apr 6, 2010 at 10:15
@pekka i inspected through firebug my response tab had nothing.... — udaya
– udaya, Commented Apr 6, 2010 at 10:18
@udaya then the response is empty, and the null appears correctly - strange because in your code, that can't really happen. — Pekka
– Pekka, Commented Apr 6, 2010 at 10:20

cletus · Accepted Answer · 2010-04-06 10:27:19Z

2

Have you set the content type correct?

header('Content-Type: application/json');

With CodeIgniter, are you meant to return the JSON object or output it? If there's no view associated with the method then nothing will be output. Try, just to see if it works:

$_SESSION['menu'] = 'finance';
$data['account'] = $this->adminmodel->getaccountDetails();
if (empty($data['account'])) {
  $data['comment'] = 'No record found !';
}
header('Content-Type: application/json');
echo json_encode($data);
exit;

Lastly, verify the URL you are going to and see if it returns something.

Take a look at JSON Helper.

edited Apr 6, 2010 at 10:27

answered Apr 6, 2010 at 10:17

cletus

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2 Comments

udaya Over a year ago

@cletus when i print_r(json_encode($data)); i get the json string but why can't return it to my ajax success function...

karim79 Over a year ago

@udaya - what @cletus is saying is, try echo json_encode($data); instead of return $data;

Ben Meisner · Accepted Answer · 2011-11-04 07:11:04Z

2

The most common reason this happens is if you are a non-secure page trying to communicate via ajax with a secure page, or vise versa (i.e. http ajaxing https)

answered Nov 4, 2011 at 7:11

Ben Meisner

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