PHP ajax show posts when i click post - php

Question

i want to make a post form and display the post i made on the list bellow the form. Here is my code. The problem is that when i click the post button the post is stored in the database BUT i have to refresh the page to show the post i did underneath.
<form method="post" id="form_wall">
<textarea name="content" id="content" class="form-control" placeholder="Share any thing what's in your mind"></textarea>
<br>
<div align="right">
<input type="submit" name="submit" id="submit" class="btn btn-primary btn-sm" value="Post" />
</div>
</form>
<h4>Latest POst </h4>
<br>
<div id="website_stuff"> </div>
</div>
</div>
</html>
<script>
$(document).ready(function(){
load_stuff();
function load_stuff()
{
$.ajax({
url:"load_stuff.php",
method:"POST",
success:function(data)
{
$('#website_stuff').html(data);
}
})
}
$('#form_wall').on('submit', function(event){
event.preventDefault();
if ($.trim($('#content').val()).length == 0)
{
alert("Please write something");
return false;
}
else
{
var form_data = $(this).serialize();
$.ajax({
url:"insert.php",
method:"POST",
data: form_data,
success:function(data)
{
if(data == 'done')
{
$('#form_wall')[0].reset();
load_stuff();
}
}
})
}
});
});
</script>
here is my insert.php code that I call when I hit the post button
<?php
include('database_connection.php');
if(isset($_POST["content"]))
{
$query = "INSERT INTO content (user_id, description) VALUES (:user_id, :description)";
var_dump($query);
$statement = $connect->prepare($query);
$statement->execute(
array(
'user_id' => $_SESSION['user_id'],
'description' => $_POST["content"]
)
);
$result = $statement->fetchAll();
if(isset($result))
{
echo 'done';
}
}
?>
Here is the load_stuff.php
<?php
include('database_connection.php');
include('function.php');
if(isset($_SESSION["user_id"]))
{
$output = '';
$query = "SELECT content.content_id, content.user_id, content.description, user_details.user_name FROM content
INNER JOIN user_details
ON user_details.user_id = content.user_id
ORDER BY content_id DESC;
";
$statement = $connect->prepare($query);
$statement->execute();
$result = $statement->fetchAll();
$total_rows = $statement->rowCount();
if($total_rows > 0)
{
foreach($result as $row)
{
$like_button ='';
if(!is_user_has_already_like_content($connect, $_SESSION["user_id"], $row["content_id"]))
{
$like_button = '<button type="button" name="like_button" class="btn btn-info btn-xs like_button" data-content_id="'.$row["content_id"].'">Like</button>';
}
$count_like = count_content_like($connect, $row["content_id"]);
$output .='
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title"> By '.$row["user_name"].'</h3>
<button type="button" name="total_like" id="total_like" class="btn btn-warning btn-xs">'.$count_like.' Like</button>
</div>
<div class="panel-body">
'.$row["description"].'
</div>
<div class="panel-footer" align="right">
'.$like_button.'
</div>
</div>';
}
}
else
{
$output = 'Nobody has share nothing';
}
echo $output;
}
?>