Country State City Dependent Dropdown in Codeigniter 4

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In Codeigniter 4, you can use the Form Helper to create a dependent dropdown.

First, you need to create a form with the necessary fields.



Then, you need to create a JavaScript function to get the states and cities based on the selected country.

Finally, you need to create the controller methods to get the states and cities based on the selected country.

public function get_states(){
$country_id = $this->input->post(‘country_id’);
$states = $this->model->get_states($country_id);
$output = ‘‘;
foreach($states as $state){
$output .= ‘‘;
foreach($cities as $city){
$output .= ‘

Country state and city dynamic dependent dropdown in PHP Codeigniter 4 with Ajax; In this tutorial guide, you will learn how to implement dynamic dependent country state city dropdown in Codeigniter 4 with Ajax and bootstrap 4.

Dynamic dependent dropdown making in Codeigniter 4 app is very easy using ajax; In this tutorial, with help of Ajax, jQuery, Bootstrap, and MySQL database will create Country State City Dependent dropdown in PHP Codeigniter 4 app.

Codeigniter 4 Country State City Dropdown Using Ajax Example

Let’s follow the following steps to implement dynamic country state city dependent dropdown using ajax in codeigniter 4 apps:

  • 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 DATABASE demo;

CREATE TABLE `countries` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
 `status` tinyint(1) NOT NULL DEFAULT '1' COMMENT '1=Active | 0=Inactive',
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `states` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `country_id` int(11) NOT NULL,
 `name` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
 `status` tinyint(1) NOT NULL DEFAULT '1' COMMENT '1=Active | 0=Inactive',
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `cities` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `state_id` int(11) NOT NULL,
 `name` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
 `status` tinyint(1) NOT NULL DEFAULT '1' COMMENT '1=Active | 0=Inactive',
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

INSERT INTO `countries` VALUES (1, 'USA', 1);
INSERT INTO `countries` VALUES (2, 'Canada', 1);
 
 
INSERT INTO `states` VALUES (1, 1, 'New York', 1);
INSERT INTO `states` VALUES (2, 1, 'Los Angeles', 1);
INSERT INTO `states` VALUES (3, 2, 'British Columbia', 1);
INSERT INTO `states` VALUES (4, 2, 'Torentu', 1);
 
 
INSERT INTO `cities` VALUES (1, 2, 'Los Angales', 1);
INSERT INTO `cities` VALUES (2, 1, 'New York', 1);
INSERT INTO `cities` VALUES (3, 4, 'Toranto', 1);
INSERT INTO `cities` VALUES (4, 3, 'Vancovour', 1);

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\Database\ConnectionInterface;
use CodeIgniter\Model;
 
class Main_model extends Model
{
 
     
    public function __construct() {
        parent::__construct();
        //$this->load->database();
        $db = \Config\Database::connect();
    }
 
	public function getCountries()
	{
		$this->db->from('countries');
		$query=$this->db->get();
		return $query->result();
	}
	 
 
	public function getStates($postData)
	{
		$this->db->from('states');
		$this->db->where('country_id',$postData['country_id']);
		$query=$this->db->get();
		return $query->result();
	} 

	public function getCities($postData)
	{
		$this->db->from('cities');
		$this->db->where('state_id',$postData['state_id']);
		$query=$this->db->get();
		return $query->result();
	}

 
}

Step 6: Create Controller

In this step, Visit app/Controllers and create a controller name DropdownAjaxController.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 DropdownAjaxController extends Controller {
 
 
    public function index() {
         
        helper(['form', 'url']);
        $this->Main_model = new Main_model();
        $data['countries'] = $this->Main_model->getCountries();
        return view('dropdown-view', $data);
    }

    public function getStates() {
 
        $this->Main_model = new Main_model();
 
        $postData = array(
            'country_id' => $this->request->getPost('country_id'),
        );
 
        $data = $this->Main_model->getStates($postData);
 
        echo json_encode($data);
    }
 
    public function getCities() {
 
        $this->Main_model = new Main_model();
 
        $postData = array(
            'state_id' => $this->request->getPost('state_id'),
        );
 
        $data = $this->Main_model->getCities($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 Dependent Country State City Dropdown using Ajax - 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 Dependent Country State City Dropdown using Ajax - tutsmake.com</h2>
</div>
<div class="card-body">
<form>
<div class="form-group">
<label for="country">Countries</label>
<select class="form-control" id="country_id">
<option value="">Select Country</option>
<?php foreach($countries as $c){?>
<option value="<?php echo $c->id;?>"><?php echo $c->name;?></option>"
<?php }?>
</select>
</div>
<div class="form-group">
<label for="state">States</label>
<select class="form-control" id="state_id">
</select>
</div>                        
<div class="form-group">
<label for="city">Cities</label>
<select class="form-control" id="city_id">
</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
$('#country_id').change(function(){
var country_id = $(this).val();
// AJAX request
$.ajax({
url:'<?=base_url()?>/DropdownAjaxController/getStates',
method: 'post',
data: {country_id: country_id},
dataType: 'json',
success: function(response){
// Remove options 
$('#state_id').find('option').not(':first').remove();
$('#city_id').find('option').not(':first').remove();
// Add options
$.each(response,function(index,data){
$('#state_id').append('<option value="'+data['id']+'">'+data['name']+'</option>');
});
}
});
});
// Department change
$('#state_id').change(function(){
var state_id = $(this).val();
// AJAX request
$.ajax({
url:'<?=base_url()?>/DropdownAjaxController/getCities',
method: 'post',
data: {state_id: state_id},
dataType: 'json',
success: function(response){
// Remove options
$('#city_id').find('option').not(':first').remove();
// Add options
$.each(response,function(index,data){
$('#city_id').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

Country state and city dynamic dependent dropdown in Codeigniter 4 with Ajax; In this example, you will learn how to implement dynamic dependent country state city dropdown in Codeigniter 4 with Ajax and bootstrap 4.

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