Getting correct value of num_rows back AJAX/JSON - php

Question

I have a notification system that out puts the right value of 1 and updates the div accordingly when a user posts one on my wall.
{
"num":1,
"notification_id":"640",
"notification_content":"Lucy Botham posted a status on your wall",
"notification_throughurl":"singlepoststreamitem.php?streamitem_id=515",
"notification_triggeredby":"85",
"notification_status":"1"
}
But if a user posts twice it does nothing and doesn't update at all.
{
"num":1,
"notification_id":"641",
"notification_content":"Lucy Botham posted a status on your wall",
"notification_throughurl":"singlepoststreamitem.php?streamitem_id=516",
"notification_triggeredby":"85",
"notification_status":"1"
}
{
"num":1,
"notification_id":"642",
"notification_content":"Lucy Botham posted a status on your wall",
"notification_throughurl":"singlepoststreamitem.php?streamitem_id=517",
"notification_triggeredby":"85",
"notification_status":"1"
}
CLIENT SIDE
$user1_id=mysqli_real_escape_string($mysqli,$_SESSION['id']);
$call="select MAX(notification_id) AS notification_id ,notification_status,notification_targetuser,notification_triggeredby,notification_throughurl from notifications WHERE notification_targetuser='$user1_id' AND notification_status='1'";
$chant=mysqli_query($mysqli,$call) or die(mysqli_error($mysqli));
while($notification=mysqli_fetch_array($chant)){
?>
<script type="text/javascript">
var notification_id="<?php echo $notification['notification_id']?>";
var notification_targetuser="<?php echo $notification['notification_targetuser']?>";
var notification_triggeredby="<?php echo $notification['notification_triggeredby']?>";
function loadIt() {
$.ajax({
type: "GET",
url: "viewajax.php?notification_id="+notification_id+"&notification_targetuser="+notification_targetuser+"&notification_triggeredby="+notification_triggeredby,
dataType:"json",
success: function(data){
if(data.notification_stream=1){
$("#notif_ui"+notification_id).prepend('<div class="notif_text"><div id="notif_actual_text-" class="notif_actual_text"><img border="1" src="userimages/cropped'+data['notification_triggeredby']+'.jpg" onerror=this.src="userimages/no_profile_img.jpeg" width="40" height="40" ><br />'+data['notification_content']+' <br />'+data['notification_time']+'<br/></div></div></div><hr/>');
i = parseInt($("#mes").text()); $("#mes").text((i+data.num));
if(!data.notification_id.length) {
//no results...
return;
}
notification_id = data.notification_id;
}
}
});
}
setInterval(loadIt, 10000);
</script>
<? } ?>
SERVER SIDE
$json = array();
$com=mysqli_query($mysqli,"SELECT * from notifications WHERE notification_targetuser='$idw' AND notification_triggeredby='$ide' AND notification_status='1' ORDER BY notification_id")or die($mysqli);
while($row = mysqli_fetch_assoc($com)){
$num = mysqli_num_rows($com);
if($num){
$json['num'] = 1;
}else{
$json['num'] = 0;
}
$json['notification_id'] = $row['notification_id'];
$json['notification_content'] = $row['notification_content'];
$json['notification_throughurl'] = $row['notification_throughurl'];
$json['notification_triggeredby'] = $row['notification_triggeredby'];
$json['notification_status'] = $row['notification_status'];
echo json_encode($json);
}}
$sql = "UPDATE notifications SET notification_status = '2' WHERE notification_targetuser='$idw'";
$go = mysqli_query($mysqli,$sql) or die(mysqli_error($mysqli));

Answer 1

You're echoing the JSON results inside a loop, so if the loop executes more than once, the final result is not valid JSON data. It's just multiple chunks of JSON.
while($row = mysqli_fetch_assoc($com)){
$id = $row['notification_id'];
$num = mysqli_num_rows($com);
if($num){
$json['num'] = 1;
}else{
$json['num'] = 0;
}
$json[$id]['notification_id'] = $row['notification_id'];
$json[$id]['notification_content'] = $row['notification_content'];
$json[$id]['notification_throughurl'] = $row['notification_throughurl'];
$json[$id]['notification_triggeredby'] = $row['notification_triggeredby'];
$json[$id]['notification_status'] = $row['notification_status'];
}
echo json_encode($json);
Then you'll need to adjust your Javascript to expect an array instead of a flat object.