Codeigniter 4 Dynamic Dependent Dropdown with Ajax

Codeigniter 4 Dynamic Dependent Dropdown with Ajax

Dynamic dependent dropdown in Codeigniter 4 with Ajax. In this example, you will learn how to implement dynamic dependent dropdown in Codeigniter 4 with Ajax and bootstrap 4.

This Codeigniter 4 ajax dependent dropdown example will guide you step by step on how to make dependent dropdown list in codeigniter 4 using ajax and bootstrap 4.

Dynamic dependent dropdown in Codeigniter 4 with Ajax

  • Download Codeigniter Latest
  • Basic Configurations
  • Create Database With Table
  • Setup Database Credentials
  • Create Model File
  • Create Controller
  • Create Views
  • Test App On Browser

Step 1: Download Codeigniter Project

In this step, you will download the latest version of Codeigniter 4, Go to this link https://codeigniter.com/download Download Codeigniter 4 fresh new setup and unzip the setup in your local system xampp/htdocs/ . And change the download folder name “demo”

Step 2: Basic Configurations

Next, you will set some basic configuration on the app/config/app.php file, so let’s go to application/config/config.php and open this file on text editor.

Set Base URL like this

public $baseURL = 'http://localhost:8080';
To
public $baseURL = 'http://localhost/demo/';

Step 3: Create Database With Table

In this step, you need to create a database name demo, so let’s open your PHPMyAdmin and create the database with the name demo. After successfully create a database, you can use the below SQL query for creating a table in your database.

CREATE TABLE `city` (
  `id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
  `cityname` varchar(80) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `department` (
  `id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
  `depart_name` varchar(80) NOT NULL,
  `city` int(3) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `user_depart` (
  `id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
  `username` varchar(80) NOT NULL,
  `name` varchar(80) NOT NULL,
  `email` varchar(80) NOT NULL,
  `department` int(3) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Step 4: Setup Database Credentials

In this step, you need to connect our project to the database. you need to go app/Config/Database.php and open database.php file in text editor. After opening the file in a text editor, you need to set up database credentials in this file like below.

	public $default = [
		'DSN'      => '',
		'hostname' => 'localhost',
		'username' => 'root',
		'password' => '',
		'database' => 'demo',
		'DBDriver' => 'MySQLi',
		'DBPrefix' => '',
		'pConnect' => false,
		'DBDebug'  => (ENVIRONMENT !== 'production'),
		'cacheOn'  => false,
		'cacheDir' => '',
		'charset'  => 'utf8',
		'DBCollat' => 'utf8_general_ci',
		'swapPre'  => '',
		'encrypt'  => false,
		'compress' => false,
		'strictOn' => false,
		'failover' => [],
		'port'     => 3306,
	];

Step 5: Create Model File

In this step, visit app/Models/ and create here one model named Main_model.php. Then add the following code into your Main_model.php file:

<?php

namespace App\Models;

use CodeIgniter\Model;

class Main_model extends Model {

    
    public function __construct() {
        parent::__construct();
        //$this->load->database();
        $db = \Config\Database::connect();
    }

    public function getCity() {

       $query = $this->db->query('select * from city');
       return $query->getResult();
    }

    public function getCityDepartment($postData) {
      $sql = 'select * from department where city ='.$postData['city'] ;
      $query =  $this->db->query($sql);
      
      return $query->getResult();
    }    

    public function getDepartmentUsers($postData) {
      $sql = 'select * from user_depart where department ='.$postData['department'] ;
      $query =  $this->db->query($sql);
      
      return $query->getResult();
    }


}

Step 6: Create Controller

In this step, Visit app/Controllers and create a controller name Dropdown.php. In this controller, you need to add the following methods into it:

<?php

namespace App\Controllers;

use CodeIgniter\Controller;
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;
use App\Models\Main_model;

class Dropdown extends Controller {


    public function index() {
        
        helper(['form', 'url']);
        $this->Main_model = new Main_model();
        $data['cities'] = $this->Main_model->getCity();
        return view('dropdown-view', $data);
    }

    public function getCityDepartment() {

        $this->Main_model = new Main_model();

        $postData = array(
            'city' => $this->request->getPost('city'),
        );

        $data = $this->Main_model->getCityDepartment($postData);

        echo json_encode($data);
    }    

    public function getDepartmentUsers() {

        $this->Main_model = new Main_model();

        $postData = array(
            'department' => $this->request->getPost('department'),
        );

        $data = $this->Main_model->getDepartmentUsers($postData);

        echo json_encode($data);
    }


}

Step 7: Create Views

In this step, you need to create one view files name dropdown-view.php and update the following code into your file:

<!DOCTYPE html>
<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
<head>
<meta charset="utf-8">
<meta name="csrf-token" content="content">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="csrf-token" content="{{ csrf_token() }}">
<title>Codeigniter 4 Ajax Dependent Dropdown List - Tutsmake.COM</title>
<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>
</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-success">Codeigniter 4 Dynamic Dependent Dropdown with Ajax - Tutsmake.COM</h2>
</div>
<div class="card-body">
<form>
<div class="form-group">
<label for="country">City</label>
<select class="form-control" id="sel_city">
<option value="">Select City</option>
<?php foreach($cities as $city){?>
<option value="<?php echo $city->id;?>"><?php echo $city->cityname;?></option>"
<?php }?>
</select>
</div>
<div class="form-group">
<label for="state">Departments</label>
<select class="form-control" id="sel_depart">
</select>
</div>                        
<div class="form-group">
<label for="city">Users</label>
<select class="form-control" id="sel_user">
</select>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
<script type='text/javascript'>
// baseURL variable
var baseURL= "<?php echo base_url();?>";
$(document).ready(function(){
// City change
$('#sel_city').change(function(){
var city = $(this).val();
// AJAX request
$.ajax({
url:'<?=base_url()?>index.php/User/getCityDepartment',
method: 'post',
data: {city: city},
dataType: 'json',
success: function(response){
// Remove options 
$('#sel_user').find('option').not(':first').remove();
$('#sel_depart').find('option').not(':first').remove();
// Add options
$.each(response,function(index,data){
$('#sel_depart').append('<option value="'+data['id']+'">'+data['depart_name']+'</option>');
});
}
});
});
// Department change
$('#sel_depart').change(function(){
var department = $(this).val();
// AJAX request
$.ajax({
url:'<?=base_url()?>index.php/User/getDepartmentUsers',
method: 'post',
data: {department: department},
dataType: 'json',
success: function(response){
// Remove options
$('#sel_user').find('option').not(':first').remove();
// Add options
$.each(response,function(index,data){
$('#sel_user').append('<option value="'+data['id']+'">'+data['name']+'</option>');
});
}
});
});
});
</script>
</body>
</html>

Step 8: Test App On Browser

Now, Go to the browser and hit below the URL.

http://localhost/demo/public/index.php/dropdown

Conclusion

In this Codeigniter 4 ajax dynamic dropdown example. In this tutorial you have successfully created Dynamic dependent dropdown in Codeigniter 4 with Ajax.

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AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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