5 Star Rating system with jQuery, AJAX, and PHP

Star rating bar gives an option to the user to submit his thoughts whether the content is good or not. This gives the administrator a view how well its item is performing.

It is very common on the e-commerce websites.

In this tutorial, I am using jQuery Bar Rating plugin to display star rating on the screen. Whenever the user changes the rating then send an AJAX request to save the user currently rating status on the MySQL database table with PHP.

5 Star Rating system with jQuery, AJAX, and PHP


  1. Table structure
  2. Configuration
  3. HTML & PHP
  4. CSS
  5. PHP
  6. Script
  7. Demo
  8. Conclusion



1. Table structure

I am using posts and post_rating table in the tutorial example.

posts table

CREATE TABLE `posts` (
  `title` varchar(100) NOT NULL,
  `content` text NOT NULL,
  `link` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)

post_rating table

  `userid` int(11) NOT NULL,
  `postid` int(11) NOT NULL,
  `rating` int(2) NOT NULL,
  PRIMARY KEY (`id`)


2. Configuration

Create a config.php for database connection.

Completed Code

$host = "localhost"; /* Host name */
$user = "root"; /* User */
$password = ""; /* Password */
$dbname = "tutorial"; /* Database name */

$con = mysqli_connect($host, $user, $password,$dbname);
// Check connection
if (!$con) {
 die("Connection failed: " . mysqli_connect_error());



You can download the plugin from here.

Load jQuery Bar Rating plugin script with jQuery library and also load a font awesome theme CSS with font awesome CDN file.

I have fixed the userid to 4 which you can replace with the $_SESSION variable. Fetch all records from the posts Table.

Get user rating on the post and average of the post.

Create a layout to show title and content. Using <select> element to show the star rating on the screen. Defined data-id attribute to get element id on the selection in the script.

Set the previously selected rating by calling barrating() method where pass rating value on the set.

Completed Code

<?php include "config.php"; ?>

<!-- CSS -->
<link href="style.css" type="text/css" rel="stylesheet" />
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/font-awesome/latest/css/font-awesome.min.css">
<link href='jquery-bar-rating-master/dist/themes/fontawesome-stars.css' rel='stylesheet' type='text/css'>
<!-- Script -->
<script src="jquery.js" type="text/javascript"></script>
<script src="jquery-bar-rating-master/dist/jquery.barrating.min.js" type="text/javascript"></script>

<div class="content">

 $userid = 4;
 $query = "SELECT * FROM posts";
 $result = mysqli_query($con,$query);
 while($row = mysqli_fetch_array($result)){
  $postid = $row['id'];
  $title = $row['title'];
  $content = $row['content'];
  $link = $row['link'];

  // User rating
  $query = "SELECT * FROM post_rating WHERE postid=".$postid." and userid=".$userid;
  $userresult = mysqli_query($con,$query) or die(mysqli_error());
  $fetchRating = mysqli_fetch_array($userresult);
  $rating = $fetchRating['rating'];

  // get average
  $query = "SELECT ROUND(AVG(rating),1) as averageRating FROM post_rating WHERE postid=".$postid;
  $avgresult = mysqli_query($con,$query) or die(mysqli_error());
  $fetchAverage = mysqli_fetch_array($avgresult);
  $averageRating = $fetchAverage['averageRating'];

  if($averageRating <= 0){
   $averageRating = "No rating yet.";
  <div class="post">
   <h1><a href='<?php echo $link; ?>' class='link' target='_blank'><?php echo $title; ?></a></h1>
   <div class="post-text">
    <?php echo $content; ?>
   <div class="post-action">
   <!-- Rating -->
   <select class='rating' id='rating_<?php echo $postid; ?>' data-id='rating_<?php echo $postid; ?>'>
    <option value="1" >1</option>
    <option value="2" >2</option>
    <option value="3" >3</option>
    <option value="4" >4</option>
    <option value="5" >5</option>
   <div style='clear: both;'></div>
   Average Rating : <span id='avgrating_<?php echo $postid; ?>'><?php echo $averageRating; ?></span>

   <!-- Set rating -->
   <script type='text/javascript'>
    $('#rating_<?php echo $postid; ?>').barrating('set',<?php echo $rating; ?>);



4. CSS

 border: 0px solid black;
 border-radius: 3px;
 padding: 5px;
 margin: 0 auto;
 width: 50%;

 border-bottom: 1px solid black;
 padding: 10px;
 margin-top: 10px;
 margin-bottom: 10px;

 border: 0;

.post h1{
 font-weight: normal;
 font-size: 30px;

.post a.link{
 text-decoration: none;
 color: black;

 letter-spacing: 1px;
 font-size: 15px;
 font-family: serif;
 color: gray;
 text-align: justify;
 margin-top: 15px;
 margin-bottom: 15px;

 border: 0;
 background: none;
 letter-spacing: 1px;
 color: lightseagreen;

 cursor: pointer;


5. PHP

Create a rating_ajax.php file.

Check for a postid entry by the user in post_rating Table. If a record exists then update the rating otherwise insert a new record.

Calculate average rating on the $postid and return JSON response.

Completed Code


include "config.php";

$userid = 4; // User id
$postid = $_POST['postid'];
$rating = $_POST['rating'];

// Check entry within table
$query = "SELECT COUNT(*) AS cntpost FROM post_rating WHERE postid=".$postid." and userid=".$userid;

$result = mysqli_query($con,$query);
$fetchdata = mysqli_fetch_array($result);
$count = $fetchdata['cntpost'];

if($count == 0){
 $insertquery = "INSERT INTO post_rating(userid,postid,rating) values(".$userid.",".$postid.",".$rating.")";
}else {
 $updatequery = "UPDATE post_rating SET rating=" . $rating . " where userid=" . $userid . " and postid=" . $postid;

// get average
$query = "SELECT ROUND(AVG(rating),1) as averageRating FROM post_rating WHERE postid=".$postid;
$result = mysqli_query($con,$query) or die(mysqli_error());
$fetchAverage = mysqli_fetch_array($result);
$averageRating = $fetchAverage['averageRating'];

$return_arr = array("averageRating"=>$averageRating);

echo json_encode($return_arr);


6. Script

Call barrating() on the class='rating'. Define options theme and onSelect in the method.

The onSelect triggers when star rating is been changed. Get the element id and by splitting get the postid. Send an AJAX request where

Send an AJAX request where pass postid and value variables as data.

On successful callback update the average value on the <span> element.

Completed Code

$(function() {
  theme: 'fontawesome-stars',
  onSelect: function(value, text, event) {

   // Get element id by data-id attribute
   var el = this;
   var el_id = el.$elem.data('id');

   // rating was selected by a user
   if (typeof(event) !== 'undefined') {
    var split_id = el_id.split("_");

    var postid = split_id[1]; // postid

    // AJAX Request
     url: 'likeunlike.php',
     type: 'post',
     data: {postid:postid,rating:value},
     dataType: 'json',
     success: function(data){
      // Update average
      var average = data['averageRating'];


7. Demo

Change star rating of the posts. Open in new tab.


8. Conclusion

In this tutorial, I used jQuery Bar Rating plugin to implement star rating on the web page. You can use any other plugins for this.

In the demonstration, I have fixed the userid value which you can update with $_SESSION variable while implementing on your project.

You can also view my earlier tutorial on like unlike using jQuery and AJAX.

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One Comment

  1. Hosub said:

    Thanks for a great tutorial. I’m trying to convert an average rating (e.g., 3.4) into stars. Could you please let me know how to do that?

    July 18, 2017

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