Apply Promo code or Coupon code in Php using Ajax

Table of Contents

Hi everyone in this tutorial we are going to see how to create Apply Promo code or Coupon code in Php using Ajax. here the complete 100% working code.

index.php

<!DOCTYPE html><html lang="en"><head>  <title>Promocode apply project In PHP</title>  <meta charset="utf-8">  <meta name="viewport" content="width=device-width, initial-scale=1">  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script></head><body><div class="container">  <h2></h2>     <div class="form-group">      <label for="email">Total Price:</label>      <input type="text" class="form-control" id="total_price" name="total_price" value="1000.00">    </div>    <div class="form-group">      <label for="promo_code">Apply Promocode:</label>      <input type="text" class="form-control" id="coupon_code" placeholder="Apply Promocode" name="coupon_code">	  <b><span id="message" style="color:green;"></span></b>    </div>        <button id="apply" class="btn btn-default">Apply</button>	<button id="edit" class="btn btn-default" style="display:none;">Edit</button>  </div><script>	$("#apply").click(function(){		if($('#promo_code').val()!=''){			$.ajax({						type: "POST",						url: "process.php",						data:{							coupon_code: $('#coupon_code').val()						},						success: function(dataResult){							var dataResult = JSON.parse(dataResult);							if(dataResult.statusCode==200){								var after_apply=$('#total_price').val()-dataResult.value;								$('#total_price').val(after_apply);								$('#apply').hide();								$('#edit').show();								$('#message').html("Promocode applied successfully !");															}							else if(dataResult.statusCode==201){								$('#message').html("Invalid promocode !");							}						}			});		}		else{			$('#message').html("Promocode can not be blank .Enter a Valid Promocode !");		}	});	$("#edit").click(function(){		$('#coupon_code').val("");		$('#apply').show();		$('#edit').hide();		location.reload();	});</script></body></html>

Connection.php

<?php$url='localhost';$username = "root";$password = "";$dbname = "school";$conn = mysqli_connect($url, $username, $password, $dbname);/* Check connection */if (!$conn) {    die("Connection failed: " . mysqli_connect_error());}?>

process.php

<?phpinclude 'conn.php';$coupon_code=$_POST['coupon_code'];$query=mysqli_query($conn,"select * from coupon_code where coupon_code='$coupon_code' and status=1");$row=mysqli_fetch_array($query);if (mysqli_num_rows($query)>0){	echo json_encode(array(				"statusCode"=>200,				"value"=>$row['value']			));}else{	echo json_encode(array("statusCode"=>201));}?>