CodeIgniter 4 Form Data Submit by Ajax Method

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CodeIgniter 4 is a open source PHP Framework. Inside this article we will see about implementation of Ajax Request in CodeIgniter 4 Tutorial.

Nowadays, every application somewhere uses Ajax request either for any operations like Create, Read, Update & Delete in CodeIgniter 4.

Inside this tutorial we will create a form with few input fields and upload in codeIgniter 4 using Ajax request. This CodeIgniter 4 form data submit by ajax is a very interesting topic to implement. This article will help you to understand in a very easy way.

Learn More –

  • CodeIgniter 4 Upload Image using Ajax Method, Click here.
  • Image Upload with Preview Using Ajax in CodeIgniter 4, Click here.

Note*: For this article, CodeIgniter v4.1 setup has been installed. May be when you are seeing, version will be updated. CodeIgniter 4.x still is in development mode.

Let’s get started.

Download & Install CodeIgniter 4 Setup

We need to download & install CodeIgniter 4 application setup to system.

To set application we have multiple options to proceed.

Here are the following ways to download and install CodeIgniter 4 –

  • Manual Download
  • Composer Installation
  • Clone Github repository of CodeIgniter 4

Complete introduction of CodeIgniter 4 basics – Click here to go. After going through this article you can easily download & install setup.

Here is the command to install via composer –

$ composer create-project codeigniter4/appstarter codeigniter-4

Assuming you have successfully installed application into your local system.

Now, let’s configure database and application connectivity.

Turn Development Mode On

When we install CodeIgniter 4, we have env file at root. To use the environment variables means using variables at global scope we need to do env to .env

Open project in terminal

$ cp env .env

Above command will create a copy of env file to .env file. Now we are ready to use environment variables.

CodeIgniter starts up in production mode by default. Let’s do it in development mode. So that while working if we get any error then error will show up.

# CI_ENVIRONMENT = production

 // Do it to 
CI_ENVIRONMENT = development

Now application is in development mode.

Create Database & Table in Application

To create a database, either we can create via Manual tool of PhpMyadmin or by means of a mysql command.

CREATE DATABASE codeigniter4_app;

Next, we need a table. That table will be responsible to store data. Let’s create table with some columns.

CREATE TABLE `users` (
 `name` varchar(120) DEFAULT NULL,
 `email` varchar(120) DEFAULT NULL,
 `mobile` varchar(45) DEFAULT NULL,

Successfully, we have created a database and a table. Let’s connect with the application.

Database Connectivity to Application

Open .env file from project root. Search for DATABASE. You should see the connection environment variables.

Let’s set the value for those to connect with database.

 database.default.hostname = localhost
 database.default.database = codeigniter4_app
 database.default.username = root
 database.default.password = root
 database.default.DBDriver = MySQLi

Now, database successfully connected with application.

Add Routes

Open Routes.php from /app/Config folder. Add these routes into it.


$routes->get("add-user", "UserController::addUser");
$routes->post("save-user", "UserController::saveUser"); 

Let’s create Model.

Create Model

Open project into terminal and run this spark command to create model.

$ php spark make:model User --suffix

It will create UserModel.php inside /app/Models folder. Open that file and write this complete code into it.


namespace App\Models;

use CodeIgniter\Model;

class UserModel extends Model
	protected $DBGroup              = 'default';
	protected $table                = 'users';
	protected $primaryKey           = 'id';
	protected $useAutoIncrement     = true;
	protected $insertID             = 0;
	protected $returnType           = 'array';
	protected $useSoftDelete        = false;
	protected $protectFields        = true;
	protected $allowedFields        = [

	// Dates
	protected $useTimestamps        = false;
	protected $dateFormat           = 'datetime';
	protected $createdField         = 'created_at';
	protected $updatedField         = 'updated_at';
	protected $deletedField         = 'deleted_at';

	// Validation
	protected $validationRules      = [];
	protected $validationMessages   = [];
	protected $skipValidation       = false;
	protected $cleanValidationRules = true;

	// Callbacks
	protected $allowCallbacks       = true;
	protected $beforeInsert         = [];
	protected $afterInsert          = [];
	protected $beforeUpdate         = [];
	protected $afterUpdate          = [];
	protected $beforeFind           = [];
	protected $afterFind            = [];
	protected $beforeDelete         = [];
	protected $afterDelete          = [];

Create Controller

Open project into terminal and run this spark command to create controller.

$ php spark make:controller User --suffix

This command will create a file UserController.php inside /app/Controllers folder.

Open UserController.php and write this complete code into it.


namespace App\Controllers;

use App\Models\UserModel;

class UserController extends BaseController
	public function __construct()

	public function addUser()
		// layout of add user form
		return view('add-user');

	public function saveUser()
		if ($this->request->getMethod() == "post") {

			$rules = [
				"name" => "required",
				"email" => "required|valid_email",
				"mobile" => "required"

			if (!$this->validate($rules)) {

				$response = [
					'success' => false,
					'msg' => "There are some validation errors",

				return $this->response->setJSON($response);
			} else {

				$userModel = new UserModel();

				$data = [
					"name" => $this->request->getVar("name"),
					"email" => $this->request->getVar("email"),
					"mobile" => $this->request->getVar("mobile"),

				if ($userModel->insert($data)) {

					$response = [
						'success' => true,
						'msg' => "User created",
				} else {
					$response = [
						'success' => true,
						'msg' => "Failed to create user",

				return $this->response->setJSON($response);

Create Layout File

Create add-user.php inside /app/Views folder.

Open add-user.php and write this complete code into it.

<!DOCTYPE html>
<html lang="en">

    <title>CodeIgniter 4 Form Data Submit by Ajax Method</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="">
    <link href="" rel="stylesheet" />
        #frm-add-user label.error{


    <div class="container">
        <h4 style="text-align: center;">CodeIgniter 4 Form Data Submit by Ajax Method</h4>
        <div class="panel panel-primary">
            <div class="panel-heading">CodeIgniter 4 Form Data Submit by Ajax Method</div>
            <div class="panel-body">
                <form class="form-horizontal" action="javascript:void(0)" id="frm-add-user">
                    <div class="form-group">
                        <label class="control-label col-sm-2" for="name">Name:</label>
                        <div class="col-sm-10">
                            <input type="text" class="form-control" required id="name" placeholder="Enter name" name="name">
                    <div class="form-group">
                        <label class="control-label col-sm-2" for="email">Email:</label>
                        <div class="col-sm-10">
                            <input type="email" class="form-control" required id="email" placeholder="Enter email" name="email">
                    <div class="form-group">
                        <label class="control-label col-sm-2" for="mobile">Mobile:</label>
                        <div class="col-sm-10">
                            <input type="text" class="form-control" required id="mobile" placeholder="Enter mobile" name="mobile">
                    <div class="form-group">
                        <div class="col-sm-offset-2 col-sm-10">
                            <button type="submit" class="btn btn-primary">Submit</button>



<script src=""></script>
<!-- Validation library file -->
<script src=""></script>
<!-- Sweetalert library file -->
<script src=""></script>

    $(function() {

        // Adding form validation

        // Ajax form submission with image
        $('#frm-add-user').on('submit', function(e) {


            var formData = new FormData(this);
            // OR var formData = $(this).serialize();

            //We can add more values to form data
            //formData.append("key", "value");

                url: "<?= site_url('save-user') ?>",
                type: "POST",
                cache: false,
                data: formData,
                processData: false,
                contentType: false,
                dataType: "JSON",
                success: function(data) {
                    if (data.success == true) {
              'Saved!', '', 'success')
                error: function(jqXHR, textStatus, errorThrown) {
                    alert('Error at add data');
  • $(“#frm-add-user”).validate(); Using validate method validation library. As you can see inside view file code we have also added jquery.validate.min.js This is for client side form validation.
  • var formData = new FormData(this); Process all form data
  • var formData = $(this).serialize(); Store form data in serialized format.
  • $.ajax({}); Using ajax method of jQuery. This method have some properties as you can see we have used in the ajax request configuration.

Application Testing

Start development server:

$ php spark serve

URL – http://localhost:8080/add-user

Submit form without any data

Let’s fill some data and press submit button to initiate Ajax request and to save data into table.

Data saved in database table

We hope this article helped you to learn about CodeIgniter 4 Form Data Submit by Ajax Method in a very detailed way.

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5 thoughts on “CodeIgniter 4 Form Data Submit by Ajax Method”

  1. Sir g thanks a lot whenever i need something i found on your site only and the way of explaining is just amazing

  2. hello sir,i just want to request that please ad check email availability in your ajax form.i mean when user submit the button it should be check whether the given email is exist or not.if yes then it should be redirect to signup form.please it’s my humble request.

  3. Hi sir nice Ci4 tutorials how , suggests me a tutorial to make a news websites

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