jquery json function not working properly

Question

This jquery function that sends a variable and retrieve data from a php file

function update(){  
    var nid = $("#identity").val(); 
    //alert(nid);
    $.getJSON('../js_backend/getComment.php', {n:nid},function(data){
        $("#comment_view_spot").empty();    
        $.each(data.result, function(){
            $("#comment_view_spot").append("<tr><td>"+this['username']+":</td><td>"+this['comment']+"</td></tr>");  
        });
    }); 
}

below is the php file it works with, the problem am having is that it works fine when am not getting the variable i sent from the jquery

$result=array();
//$n=$_GET['n'];
$getJs=$connect->query("SELECT * FROM blog_comment");
while($rows=$getJs->fetch()){
    array_push($result, array(
        'username'=>$rows['username'],
        'comment'=>$rows['comment']
    ));
}
header('Content-type: application/json');
echo json_encode(array("result" => $result));

but when am getting the variable it does not work fine if i try to go directly to the php file i see this bunch of codes

<br />
<font size='1'><table class='xdebug-error xe-notice' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Notice: Undefined index: n in C:\wamp\www\ezoole\js_backend\getComment.php on line <i>6</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0004</td><td bgcolor='#eeeeec' align='right'>241728</td><td bgcolor='#eeeeec'>{main}(  )</td><td title='C:\wamp\www\ezoole\js_backend\getComment.php' bgcolor='#eeeeec'>..\getComment.php<b>:</b>0</td></tr>
</table></font>

please someone should help me resolve this.

$.postJSON is not standard jQuery but perhaps if you changed {n:nid} to {"n::nid} it might work, otherwise just use the standard jquery post api.jquery.com/jquery.post — Rob Schmuecker
– Rob Schmuecker, Commented Aug 5, 2014 at 22:32
I think the problem is that you "post" your data but you use the superglobal $_GET in your PHP... you should use $_POST instead — Oliboy50
– Oliboy50, Commented Aug 5, 2014 at 22:33
+1 @Oliboy50 that sounds a much more sensible answer than mine! — Rob Schmuecker
– Rob Schmuecker, Commented Aug 5, 2014 at 22:46
i have tried your style and corrected the $_GET but still giving the same error — rapulu
– rapulu, Commented Aug 5, 2014 at 22:54

Vinit Chouhan · Accepted Answer · 2014-08-05 23:08:39Z

1

The problen is that you are using $n=$_GET['n']; but the method you are using is post

Write

$n=$_POST['n'];

Instead of $n=$_GET['n'];

This should work correctly

$.ajax({
url:'../js_backend/getComment.php',
type:'POST',
data:{n:nid},
success: function(data){
$("#comment_view_spot").empty();    
    $.each(data.result, function(){
        $("#comment_view_spot").append("<tr><td>"+this['username']+":</td><td>"+this['comment']+"</td></tr>");
}
});

And on server side use

$n=$_POST['n'];

edited Aug 5, 2014 at 23:08

answered Aug 5, 2014 at 22:41

Vinit Chouhan

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1 Comment

rapulu Over a year ago

i have corrected it but still giving me the same error

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