Category Subcategory Dropdown in PHP MySQL Ajax With Example

Category Subcategory Dropdown in PHP MySQL Ajax With Example

How to fetch data from database in dropdownlist in php. Here, we'll show how to create categories and subcategories in php mysql using ajax.

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

<!DOCTYPE html>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <title>Dynamic Category Subcategory Dropdown in PHP MySQL Ajax -</title>
      <!-- Fonts -->
      <link href=",600" rel="stylesheet">
      <!-- Styles -->
      <link rel="stylesheet" href="" >
      <script src=""></script>
         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;
      <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 -</h2>
                  <div class="card-body">
                        <div class="form-group">
                           <label for="CATEGORY-DROPDOWN">Category</label>
                           <select class="form-control" id="category-dropdown">
                              <option value="">Select Category</option>
                                 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>
                        <div class="form-group">
                           <label for="SUBCATEGORY">Sub Category</label>
                           <select class="form-control" id="sub-category-dropdown">
         $(document).ready(function() {
    $('#category-dropdown').on('change', function() {
        var category_id = this.value;
            url: "fetch-subcategory-by-category.php",
            type: "POST",
            data: {
                category_id: category_id
            cache: false,
            success: function(result) {

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