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Simple Chatbot using PHP with MySQL & jQuery (Ajax)

codingnepal profile image CodingNepal ・5 min read

Hello readers, Today in this blog you'll learn how to create a Simple Chatbot using PHP with MySQL & jQuery (Ajax). Earlier I've shared a blog on how to Send Email with PHP from Localhost using the XAMPP server and now it's time to create a working chatbot in PHP.

A chatbot is a computer program designed to simulate human conversation. These chatbots reply to you instantly according to your queries because programmers have inserted thousands of inputs/replies/queries into the database that can be asked by the user. To make an advanced chatbot we've to code more and more but I tried to make a simple chatbot with few lines of codes and queries which help you to get an idea about how a chatbot actually works.

In this program [Simple Chatbot using PHP], on the webpage, there is a chat form with an input field and a button labeled as "send" for typing a message and send to the bot. When you ask something to the bot and that query exists in the database then the bot replay a message according to your query instantly but if your query not matched to the database queries then the bot replays a message labeled as "Sorry can't be able to understand you!". In this chatting process, the webpage isn't reloaded because I used jQuery (Ajax) for that.

You can copy the codes from the given boxes or download the code files from the given link but I recommend you to download the source code files instead of copying codes. Click here to download code files.

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PHP CODE:
<!-- Created By CodingNepal -->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- Somehow I got an error, so I comment the title, just uncomment to show -->
    <!-- <title>Simple Chatbot in PHP | CodingNepal</title> -->
    <link rel="stylesheet" href="style.css">
    <script src="https://kit.fontawesome.com/a076d05399.js"></script>
    <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
</head>
<body>
    <div class="wrapper">
        <div class="title">Simple Online Chatbot</div>
        <div class="form">
            <div class="bot-inbox inbox">
                <div class="icon">
                    <i class="fas fa-user"></i>
                </div>
                <div class="msg-header">
                    <p>Hello there, how can I help you?</p>
                </div>
            </div>
        </div>
        <div class="typing-field">
            <div class="input-data">
                <input id="data" type="text" placeholder="Type something here.." required>
                <button id="send-btn">Send</button>
            </div>
        </div>
    </div>

    <script>
        $(document).ready(function(){
            $("#send-btn").on("click", function(){
                $value = $("#data").val();
                $msg = '<div class="user-inbox inbox"><div class="msg-header"><p>'+ $value +'</p></div></div>';
                $(".form").append($msg);
                $("#data").val('');

                // start ajax code
                $.ajax({
                    url: 'message.php',
                    type: 'POST',
                    data: 'text='+$value,
                    success: function(result){
                        $replay = '<div class="bot-inbox inbox"><div class="icon"><i class="fas fa-user"></i></div><div class="msg-header"><p>'+ result +'</p></div></div>';
                        $(".form").append($replay);
                        // when chat goes down the scroll bar automatically comes to the bottom
                        $(".form").scrollTop($(".form")[0].scrollHeight);
                    }
                });
            });
        });
    </script>

</body>
</html>
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MESSAGE.PHP CODE:
<!-- Created By CodingNepal -->
<?php
// connecting to database
$conn = mysqli_connect("localhost", "root", "", "bot") or die("Database Error");

// getting user message through ajax
$getMesg = mysqli_real_escape_string($conn, $_POST['text']);

//checking user query to database query
$check_data = "SELECT replies FROM chatbot WHERE queries LIKE '%$getMesg%'";
$run_query = mysqli_query($conn, $check_data) or die("Error");

// if user query matched to database query we'll show the reply otherwise it go to else statement
if(mysqli_num_rows($run_query) > 0){
    //fetching replay from the database according to the user query
    $fetch_data = mysqli_fetch_assoc($run_query);
    //storing replay to a varible which we'll send to ajax
    $replay = $fetch_data['replies'];
    echo $replay;
}else{
    echo "Sorry can't be able to understand you!";
}

?>
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CSS CODE:
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}
html,body{
    display: grid;
    height: 100%;
    place-items: center;
}

::selection{
    color: #fff;
    background: #007bff;
}

::-webkit-scrollbar{
    width: 3px;
    border-radius: 25px;
}
::-webkit-scrollbar-track{
    background: #f1f1f1;
}
::-webkit-scrollbar-thumb{
    background: #ddd;
}
::-webkit-scrollbar-thumb:hover{
    background: #ccc;
}

.wrapper{
    width: 370px;
    background: #fff;
    border-radius: 5px;
    border: 1px solid lightgrey;
    border-top: 0px;
}
.wrapper .title{
    background: #007bff;
    color: #fff;
    font-size: 20px;
    font-weight: 500;
    line-height: 60px;
    text-align: center;
    border-bottom: 1px solid #006fe6;
    border-radius: 5px 5px 0 0;
}
.wrapper .form{
    padding: 20px 15px;
    min-height: 400px;
    max-height: 400px;
    overflow-y: auto;
}
.wrapper .form .inbox{
    width: 100%;
    display: flex;
    align-items: baseline;
}
.wrapper .form .user-inbox{
    justify-content: flex-end;
    margin: 13px 0;
}
.wrapper .form .inbox .icon{
    height: 40px;
    width: 40px;
    color: #fff;
    text-align: center;
    line-height: 40px;
    border-radius: 50%;
    font-size: 18px;
    background: #007bff;
}
.wrapper .form .inbox .msg-header{
    max-width: 53%;
    margin-left: 10px;
}
.form .inbox .msg-header p{
    color: #fff;
    background: #007bff;
    border-radius: 10px;
    padding: 8px 10px;
    font-size: 14px;
    word-break: break-all;
}
.form .user-inbox .msg-header p{
    color: #333;
    background: #efefef;
}
.wrapper .typing-field{
    display: flex;
    height: 60px;
    width: 100%;
    align-items: center;
    justify-content: space-evenly;
    background: #efefef;
    border-top: 1px solid #d9d9d9;
    border-radius: 0 0 5px 5px;
}
.wrapper .typing-field .input-data{
    height: 40px;
    width: 335px;
    position: relative;
}
.wrapper .typing-field .input-data input{
    height: 100%;
    width: 100%;
    outline: none;
    border: 1px solid transparent;
    padding: 0 80px 0 15px;
    border-radius: 3px;
    font-size: 15px;
    background: #fff;
    transition: all 0.3s ease;
}
.typing-field .input-data input:focus{
    border-color: rgba(0,123,255,0.8);
}
.input-data input::placeholder{
    color: #999999;
    transition: all 0.3s ease;
}
.input-data input:focus::placeholder{
    color: #bfbfbf;
}
.wrapper .typing-field .input-data button{
    position: absolute;
    right: 5px;
    top: 50%;
    height: 30px;
    width: 65px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    outline: none;
    opacity: 0;
    pointer-events: none;
    border-radius: 3px;
    background: #007bff;
    border: 1px solid #007bff;
    transform: translateY(-50%);
    transition: all 0.3s ease;
}
.wrapper .typing-field .input-data input:valid ~ button{
    opacity: 1;
    pointer-events: auto;
}
.typing-field .input-data button:hover{
    background: #006fef;
}
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I've missed many other things in this article so you may face problems while implementing these codes. Please check out this blog where I've explained everything about this chatbot and the codes - https://www.codingnepalweb.com/2020/09/simple-chatbot-using-php-with-mysql.html

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