Category Subcategory Dropdown In PHP MySQL Ajax With Example
Tags: laravel, css
Published: 2020-11-18 10:10:39

Sometimes, you need to select a query in PHP so we create separate tables to display selected subcategories based on selected category dropdowns. But in this tutorial, we will use/learn only a single table use (category and subcategory in one table) for a PHP dynamic fetch data from database in dropdownlist in PHP.

**[Category Subcategory Dropdown In PHP MySQL Ajax With Example](https://www.phpcodingstuff.com/blog/category-subcategory-dropdown-in-php-mysql-ajax-with-example.html)**

```
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <title>Dynamic Category Subcategory Dropdown in PHP MySQL Ajax - phpcodingstuff.com</title>
      <!-- Fonts -->
      <link href="https://fonts.googleapis.com/css?family=Nunito:200,600" rel="stylesheet">
      <!-- Styles -->
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" >
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
      <style>
         html, body {
         background-color: #fff;
         color: #636b6f;
         font-family: 'Nunito', sans-serif;
         font-weight: 200;
         height: 100vh;
         margin: 0;
         }
         .full-height {
         height: 100vh;
         }
         .flex-center {
         align-items: center;
         display: flex;
         justify-content: center;
         }
         .position-ref {
         position: relative;
         }
         .top-right {
         position: absolute;
         right: 10px;
         top: 18px;
         }
         .content {
         text-align: center;
         }
         .title {
         font-size: 84px;
         }
         .links > a {
         color: #636b6f;
         padding: 0 25px;
         font-size: 13px;
         font-weight: 600;
         letter-spacing: .1rem;
         text-decoration: none;
         text-transform: uppercase;
         }
         .m-b-md {
         margin-bottom: 30px;
         }
      </style>
   </head>
   <body>
      <div class="container mt-5">
         <div class="row justify-content-center">
            <div class="col-md-8">
               <div class="card">
                  <div class="card-header">
                     <h2 class="text-primary">Category Subcategory Dropdown in PHP MySQL Ajax - phpcodingstuff.com</h2>
                  </div>
                  <div class="card-body">
                     <form>
                        <div class="form-group">
                           <label for="CATEGORY-DROPDOWN">Category</label>
                           <select class="form-control" id="category-dropdown">
                              <option value="">Select Category</option>
                              <?php
                                 require_once "db.php";
                                 $result = mysqli_query($conn,"SELECT * FROM categories where parent_id = 0");
                                 while($row = mysqli_fetch_array($result)) {
                                 ?>
                              <option value="<?php echo $row['id'];?>"><?php echo $row["category"];?></option>
                              <?php
                                 }
                                 ?>
                           </select>
                        </div>
                        <div class="form-group">
                           <label for="SUBCATEGORY">Sub Category</label>
                           <select class="form-control" id="sub-category-dropdown">
                           </select>
                        </div>
                     </form>
                  </div>
               </div>
            </div>
         </div>
      </div>
      <script>
         $(document).ready(function() {
    $('#category-dropdown').on('change', function() {
        var category_id = this.value;
        $.ajax({
            url: "fetch-subcategory-by-category.php",
            type: "POST",
            data: {
                category_id: category_id
            },
            cache: false,
            success: function(result) {
                $("#sub-category-dropdown").html(result);
            }
        });
    });
});
      </script>
   </body>
</html>
```