Data missing when sent via AJAX - php

Question

I want to send two values to my PHP script that is being called from an AJAX request. Somehow my data is not being passed to the PHP script.
Maybe I am doing something wrong somewhere. Can I have some insight?
$(function() {
$(".delbutton").click(function() {
var viewed_comments = $("#viewed_comments").val();
var del_id = $(this).attr("id");
var info = 'id=' + del_id;
var comments = 'comm=' + viewed_comments;
var tr = $(this).closest('tr');
if (confirm("Are you sure to mark this as viewed?")) {
$.ajax({
type : "POST",
url : "update_entry.php",
dataType: "json",
data: {info:info, comments:comments },
success : function(response) {
if(response=="updation success"){
console.log('inside');
}
}
});
}
return false;
});
});
And my PHP where the AJAX request is going,
$id = $_POST['id'];
$viewed_comments = $_POST['comm'];
$level_code = $_SESSION['level_code'];
$action = 'view';
$viewed_date = date("Y-m-d");
$viewed_by = $_SESSION['session_admin_id'] ;
if($action == 'view')
{
$viewed_date = date('Y-m-d h:i:s');
$nots = $db->idToField("tbl_table","notes",$id);
if ($nots == "")
{
$date_string = "last viewed on|".$viewed_date."|" ;
}
else {
$date_string = $nots."last viewed on|".$viewed_date."|" ;
}
$fnc->update_is_viewed_for("tbl_table",$id, "$viewed_date", $viewed_by);
$notes_data = array("notes"=>$date_string,"viewed_comments"=>$viewed_comments);
$db->query_update("tbl_table", $notes_data, "id=$id");
}
if($db->query_update("tbl_table", $notes_data, "id=$id")){
http_response_code();
echo json_encode('updation success');
}else{
http_response_code(204);
}

Answer 1

Isn't it a name thing? You send two POST variables:
data: {
info: info,
comments: comments
},
but you retrieve them with different names:
$id = $_POST['id'];
$viewed_comments = $_POST['comm'];
What do you get if you var_dump($_POST);?

Answer 2

Use seriliaze form values it will solve your data missing problem, change #frm to your form id
$(document).ready(function(){
$('#frm').submit(function(event){
event.preventDefault();
var formValues = $(this).serialize();
$.ajax({
url:"update_entry.php",
method:"POST",
data:formValues,
dataType:"JSON",
success:function(data){
if (data == 'updation success') {
console.log('success');
}
}
});
});
});