jQuery Ajax success function returns null?

javascript jquery ajax codeigniter

16,129

Solution 1

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.

Solution 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)

16,129

Author by

udaya

I am proud to be programmer....willing to earn more knowledge

Updated on June 04, 2022

Comments

udaya about 2 years

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"}]

udaya about 14 years

@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 about 14 years

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