PHP Comments Source Code in AJAX and PHP

In this tutorial, we will be teaching you how to make comments system using PHP and ajax.

Each comment will have a unique id. You can add comments in the database with the senders’ name.

HTML Code of Comments

<html>
<head>
<style>
body {
	font-family: calibri;
}
ul {
    list-style-type: none;
}
.CommentForm {
	background: #756767;
	border: #e0dfdf 1px solid;
	padding: 20px 25px 30px 20px;
	border-radius: 2px;
	width: 550px;
}
.Input_F {
    width: 100%;
    border-radius: 2px;
    padding: 10px;
    border: #e0dfdf 1px solid;
}
.inputarea {
	margin-bottom: 20px;
}
.Input_F1 {
	width: 100%;
	border-radius: 2px;
	padding: 10px;
	border: #e0dfdf 1px solid;
	height: 90px;
}
.row_comment {
    border-bottom: #e0dfdf 1px solid;
    margin-bottom: 15px;
    padding: 15px;
}
.button_S {
	padding: 10px 20px;
	background: #e8dcdc;
	border: #1d1d1d 1px solid;
	color: #756767;
	font-size: 0.9em;
	width: 100px;
	border-radius: 2px;
    cursor:pointer;
}
span.com_row_l {
	font-style: italic;
}
.c_ot {
    background: #756767;
    padding: 20px;
    border: #dedddd 1px solid;
}
span.sender {
	color: #09F;
}
.text_com {
    margin: 10px 0px;
}
.rply_button {
    font-size: 0.8em;
    text-decoration: underline;
    color: #888787;
    cursor:pointer;
}
.com_info {
	font-size: 0.8em;
}
#c_message {
    margin-left: 20px;
    color: #189a18;
    display: none;
}
</style>
<title>Comments using AJAX and PHP</title>
<script src="jquery-3.2.1.min.js"></script>
<body>
    <h1 style="text-align: center;">Comments using AJAX and PHP.</h1>
    <center><div class="CommentForm">
        <form id="form1">
            <div class="inputarea">
                <input type="hidden" name="c_id" id="CID"
                    placeholder="Name" /> <input class="Input_F"
                    type="text" name="name" id="name" placeholder="Name" />
            </div>
            <div class="inputarea">
                <textarea class="Input_F1" type="text" name="comment"
                    id="comment" placeholder="Add a Comment">  </textarea>
            </div>
            <div>
                <input type="button" class="button_S" id="submitButton"
                    value="Publish" /><div id="c_message">Successfully! Added a Comment.</div>
            </div>
        </form>
    </div></center>
    <div id="output"></div>
    <script>
            function postReply(CID) {
                $('#CID').val(CID);
                $("#name").focus();
            }
            $("#submitButton").click(function () {
            	   $("#c_message").css('display', 'none');
                var str = $("#form1").serialize();
                $.ajax({
                    url: "add_comment.php",
                    data: str,
                    type: 'post',
                    success: function (response)
                    {
                        var result = eval('(' + response + ')');
                        if (response)
                        {
                        	$("#c_message").css('display', 'inline-block');
                            $("#name").val("");
                            $("#comment").val("");
                            $("#CID").val("");
                     	   comment_list();
                        } else
                        {
                            alert("Error in adding comments !");
                            return false;
                        }
                    }
                });
            });         
            $(document).ready(function () {
            	   comment_list();
            });
            function comment_list() {
                $.post("ListOfComment.php",
                        function (data) {
                            var data = JSON.parse(data);                         
                            var comments = "";
                            var replies = "";
                            var item = "";
                            var parent = -1;
                            var results = new Array();
                            var list = $("<ul class='c_ot'>");
                            var item = $("<li>").html(comments);
                            for (var i = 0; (i < data.length); i++)
                            {
                                var CID = data[i]['c_id'];
                                parent = data[i]['parent_c_id'];
                                if (parent == "0")
                                {
                                    comments = "<div class='row_comment'>"+
                                    "<div class='com_info'><span class='com_row_l'>from</span> <span class='sender'>" + data[i]['comment_sender_name'] + " </span> <span class='com_row_l'>at</span> <span class='posted-at'>" + data[i]['date'] + "</span></div>" + 
                                    "<div class='text_com'>" + data[i]['comment'] + "</div>"+
                                    "<div><a class='rply_button' onClick='postReply(" + CID + ")'>Reply</a></div>"+
                                    "</div>";

                                    var item = $("<li>").html(comments);
                                    list.append(item);
                                    var reply_list = $('<ul>');
                                    item.append(reply_list);
                                    listReplies(CID, data, reply_list);
                                }
                            }
                            $("#output").html(list);
                        });
            }
            function listReplies(CID, data, list) {
                for (var i = 0; (i < data.length); i++)
                {
                    if (CID == data[i].parent_c_id)
                    {
                        var comments = "<div class='row_comment'>"+
                        " <div class='com_info'><span class='com_row_l'>from</span> <span class='sender'>" + data[i]['comment_sender_name'] + " </span> <span class='com_row_l'>at</span> <span class='posted-at'>" + data[i]['date'] + "</span></div>" + 
                        "<div class='text_com'>" + data[i]['comment'] + "</div>"+
                        "<div><a class='rply_button' onClick='postReply(" + data[i]['c_id'] + ")'>Reply</a></div>"+
                        "</div>";
                        var item = $("<li>").html(comments);
                        var reply_list = $('<ul>');
                        list.append(item);
                        item.append(reply_list);
                        listReplies(data[i].c_id, data, reply_list);
                    }
                }
            }
        </script>
</body>
</html>

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<html>

<head>

<style>

body {

font-family: calibri;

}

ul {

list-style-type: none;

}

.CommentForm {

background: #756767;

border: #e0dfdf 1px solid;

padding: 20px 25px 30px 20px;

border-radius: 2px;

width: 550px;

}

.Input_F {

width: 100%;

border-radius: 2px;

padding: 10px;

border: #e0dfdf 1px solid;

}

.inputarea {

margin-bottom: 20px;

}

.Input_F1 {

width: 100%;

border-radius: 2px;

padding: 10px;

border: #e0dfdf 1px solid;

height: 90px;

}

.row_comment {

border-bottom: #e0dfdf 1px solid;

margin-bottom: 15px;

padding: 15px;

}

.button_S {

padding: 10px 20px;

background: #e8dcdc;

border: #1d1d1d 1px solid;

color: #756767;

font-size: 0.9em;

width: 100px;

border-radius: 2px;

cursor:pointer;

}

span.com_row_l {

font-style: italic;

}

.c_ot {

background: #756767;

padding: 20px;

border: #dedddd 1px solid;

}

span.sender {

color: #09F;

}

.text_com {

margin: 10px 0px;

}

.rply_button {

font-size: 0.8em;

text-decoration: underline;

color: #888787;

cursor:pointer;

}

.com_info {

font-size: 0.8em;

}

#c_message {

margin-left: 20px;

color: #189a18;

display: none;

}

</style>

<title>Comments using AJAX and PHP</title>

<body>

<h1 style="text-align: center;">Comments using AJAX and PHP.</h1>

<input type="hidden" name="c_id" id="CID"

placeholder="Name" /> <input class="Input_F"

type="text" name="name" id="name" placeholder="Name" />

</div>

<textarea class="Input_F1" type="text" name="comment"

id="comment" placeholder="Add a Comment"> </textarea>

</div>

<div>

<input type="button" class="button_S" id="submitButton"

value="Publish" /><div id="c_message">Successfully! Added a Comment.</div>

</div>

</form>

</div></center>

function postReply(CID) {

$('#CID').val(CID);

$("#name").focus();

}

$("#submitButton").click(function () {

$("#c_message").css('display', 'none');

var str = $("#form1").serialize();

$.ajax({

url: "add_comment.php",

data: str,

type: 'post',

success: function (response)

{

var result = eval('(' + response + ')');

if (response)

{

$("#c_message").css('display', 'inline-block');

$("#name").val("");

$("#comment").val("");

$("#CID").val("");

comment_list();

} else

{

alert("Error in adding comments !");

return false;

}

});

$(document).ready(function () {

comment_list();

});

function comment_list() {

$.post("ListOfComment.php",

function (data) {

var data = JSON.parse(data);

var comments = "";

var replies = "";

var item = "";

var parent = -1;

var results = new Array();

var list = $("<ul class='c_ot'>");

var item = $("<li>").html(comments);

for (var i = 0; (i < data.length); i++)

{

var CID = data[i]['c_id'];

parent = data[i]['parent_c_id'];

if (parent == "0")

{

comments = "<div class='row_comment'>"+

"<div class='com_info'><span class='com_row_l'>from</span> <span class='sender'>" + data[i]['comment_sender_name'] + " </span> <span class='com_row_l'>at</span> <span class='posted-at'>" + data[i]['date'] + "</span></div>" +

"<div class='text_com'>" + data[i]['comment'] + "</div>"+

"<div><a class='rply_button' onClick='postReply(" + CID + ")'>Reply</a></div>"+

"</div>";

var item = $("<li>").html(comments);

list.append(item);

var reply_list = $('<ul>');

item.append(reply_list);

listReplies(CID, data, reply_list);

}

$("#output").html(list);

});

}

function listReplies(CID, data, list) {

for (var i = 0; (i < data.length); i++)

{

if (CID == data[i].parent_c_id)

{

var comments = "<div class='row_comment'>"+

" <div class='com_info'><span class='com_row_l'>from</span> <span class='sender'>" + data[i]['comment_sender_name'] + " </span> <span class='com_row_l'>at</span> <span class='posted-at'>" + data[i]['date'] + "</span></div>" +

"<div class='text_com'>" + data[i]['comment'] + "</div>"+

"<div><a class='rply_button' onClick='postReply(" + data[i]['c_id'] + ")'>Reply</a></div>"+

"</div>";

var item = $("<li>").html(comments);

var reply_list = $('<ul>');

list.append(item);

item.append(reply_list);

listReplies(data[i].c_id, data, reply_list);

}

</script>

</body>

</html>

Publishing Comments (PHP Code)

ListOfComment.php

<?php
require_once ("database.php");
$sql = "SELECT * FROM comment_table ORDER BY parent_c_id asc, comment_id asc";
$result = mysqli_query($conn, $sql);
$record_set = array();
while ($row = mysqli_fetch_assoc($result)) {
    array_push($record_set, $row);
}
mysqli_free_result($result);
mysqli_close($conn);
echo json_encode($record_set);
?>

<?php

require_once ("database.php");

$sql = "SELECT * FROM comment_table ORDER BY parent_c_id asc, comment_id asc";

$result = mysqli_query($conn, $sql);

$record_set = array();

while ($row = mysqli_fetch_assoc($result)) {

array_push($record_set, $row);

}

mysqli_free_result($result);

mysqli_close($conn);

echo json_encode($record_set);

add_comment.php

<?php
require_once ("database.php");
$cId = isset($_POST['c_id']) ? $_POST['c_id'] : "";
$comment = isset($_POST['comment']) ? $_POST['comment'] : "";
$C_sender_name = isset($_POST['name']) ? $_POST['name'] : "";
$date = date('Y-m-d H:i:s');
$sql = "INSERT INTO comment_table(parent_c_id,comment,name_of_sender,date) VALUES ('" . $cId . "','" . $comment . "','" . $C_sender_name . "','" . $date . "')";
$result = mysqli_query($conn, $sql);
if (! $result) {
    $result = mysqli_error($conn);
}
echo $result;
?>

<?php

require_once ("database.php");

$cId = isset($_POST['c_id']) ? $_POST['c_id'] : "";

$comment = isset($_POST['comment']) ? $_POST['comment'] : "";

$C_sender_name = isset($_POST['name']) ? $_POST['name'] : "";

$date = date('Y-m-d H:i:s');

$sql = "INSERT INTO comment_table(parent_c_id,comment,name_of_sender,date) VALUES ('" . $cId . "','" . $comment . "','" . $C_sender_name . "','" . $date . "')";

$result = mysqli_query($conn, $sql);

if (! $result) {

$result = mysqli_error($conn);

}

echo $result;

Database of Comments

You will have to create a database named “comments” and create a table “comment_table”.

Add attributes:

c_id
parent_c_id
comment
name_of_sender
date

Code to create tables in the database:

comment_table.sql

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";
CREATE TABLE `comment_table` (
  `c_id` int(11) NOT NULL,
  `parent_c_id` int(11) DEFAULT NULL,
  `comment` varchar(200) NOT NULL,
  `name_of_sender` varchar(40) NOT NULL,
  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `comment_table` (`c_id`, `parent_c_id`, `comment`, `name_of_sender`, `date`) VALUES
(1, 0, '  visit t4tutorials', 'George', '2019-02-14 02:54:57'),
(2, 0, ' something ', 'Mike', '2018-12-12 12:56:01'),
(3, 2, '  www.t4tutorials.com', 'Drake', '2019-01-01 10:56:12');
ALTER TABLE `comment_table`
  ADD PRIMARY KEY (`c_id`);
ALTER TABLE `comment_table`
  MODIFY `c_id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=27;
COMMIT;

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";

SET AUTOCOMMIT = 0;

START TRANSACTION;

SET time_zone = "+00:00";

CREATE TABLE `comment_table` (

`c_id` int(11) NOT NULL,

`parent_c_id` int(11) DEFAULT NULL,

`comment` varchar(200) NOT NULL,

`name_of_sender` varchar(40) NOT NULL,

`date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `comment_table` (`c_id`, `parent_c_id`, `comment`, `name_of_sender`, `date`) VALUES

(1, 0, ' visit t4tutorials', 'George', '2019-02-14 02:54:57'),

(2, 0, ' something ', 'Mike', '2018-12-12 12:56:01'),

(3, 2, ' www.t4tutorials.com', 'Drake', '2019-01-01 10:56:12');

ALTER TABLE `comment_table`

ADD PRIMARY KEY (`c_id`);

ALTER TABLE `comment_table`

MODIFY `c_id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=27;

COMMIT;

Your database will look like this:

Output Comment System:

Download Comments System Code in PHP and MySQL

Download Code – PHPAJAXCommentsSystem