CodeIgniter 4 Form Validation Example
Codeigniter 20-Apr-2022

CodeIgniter 4 Form Validation Example

CodeIgniter 4 form validation example tutorial. In this Codeigniter 4 form validation tutorial, you will learn how to create bootstrap forms and send and validate on the server. Basically, validation happens on both sides like server-side and client-side, On the server-side that you need to define the validation rules.

In this codeigniter 4 Bootstrap form validation example, we will use the form validation library of Codeigniter that is validate form data on server side.

Codeigniter 4 Form Validation Tutorial with Example

Follow the below steps and validate form data on server-side in CodeIgniter 4 framework:

  • Download Codeigniter Latest
  • Basic Configurations
  • Create Database With Table
  • Setup Database Credentials
  • Create Model and Controller
  • Create Views
  • Start Development server

Step 1: Download Codeigniter Project

In this step, we will download the latest version of Codeigniter 4, Go to this link 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, we 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';
public $baseURL = 'http://localhost/demo/';

Step 3: Create Database With Table

In this step, we 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 contacts (
    id int(11) NOT NULL AUTO_INCREMENT COMMENT 'Primary Key',
    name varchar(100) NOT NULL COMMENT 'Name',
    email varchar(255) NOT NULL COMMENT 'Email Address',
    message varchar(250) NOT NULL COMMENT 'Message',
    created_at varchar(20) NOT NULL COMMENT 'Created date',
    PRIMARY KEY (id)

Step 4: Setup Database Credentials

In this step, we need to connect our project to the database. we need to go app/Config/Database.php and open database.php file in text editor. After opening the file in a text editor, We 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 and Controller

So go to app/Models/ and create here one model. And you need to create one model name contactModel.php and update the following code into your contactModel.php file:

<?php namespace App\Models;
use CodeIgniter\Database\ConnectionInterface;
use CodeIgniter\Model;
class ContactModel extends Model
    protected $table = 'contacts';
    protected $allowedFields = ['name', 'email', 'message'];

Create Controller

Now Go to app/Controllers and create a controller name Contact.php. In this controller, we will create some method/function. We will build some of the methods like :

  • Index() – This is used to display contact us form.
  • create() – This is used to validate form data server-side and store into mysql database

<?php namespace App\Controllers;
use CodeIgniter\Controller;
use App\Models\ContactModel;
class Contact extends Controller
    public function index()
         return view('contact');
    public function create()
    helper(['form', 'url']);
        $val = $this->validate([
            'name' => 'required',
            'email' => 'required',
            'message'  => 'required',
        $model = new ContactModel();
        if (!$val)
            echo view('contact', [
                   'validation' => $this->validator
                'name' => $this->request->getVar('name'),
                'email'  => $this->request->getVar('email'),
                'message'  => $this->request->getVar('message'),
            echo view('success');

Step 6: Create Views

Now we need to create contact.php, go to application/views/ folder and create contact.php file. and update the following HTML into your files:.

<!DOCTYPE html>
  <title>Codeigniter 4 Form Validation Example</title>
 <link rel="stylesheet" href="">
 <div class="container">
    <?= \Config\Services::validation()->listErrors(); ?>
    <div class="row">
      <div class="col-md-9">
        <form action="<?php echo base_url('public/index.php/contact/create') ?>" method="post" accept-charset="utf-8">
          <div class="form-group">
            <label for="formGroupExampleInput">Name</label>
            <input type="text" name="name" class="form-control" id="formGroupExampleInput" placeholder="Please enter name">
          <div class="form-group">
            <label for="email">Email Id</label>
            <input type="text" name="email" class="form-control" id="email" placeholder="Please enter email id">
          <div class="form-group">
            <label for="message">Message</label>
            <textarea name="message" class="form-control"></textarea>
          <div class="form-group">
           <button type="submit" id="send_form" class="btn btn-success">Submit</button>

This below line display error messages on your web page:

<?= \Config\Services::validation()->listErrors(); ?>

Now we need to create success.php file, so go to application/views/ and create success.php file. And put the below code here.

<!DOCTYPE html>
  <title> Codeigniter 4 Form Success </title>
 <link rel="stylesheet" href="">
    <div class="container mt-5">
     <h1 class="text-center"> Thank You for contact us</h1>

Step 7: Start Development server

For start development server, Go to the browser and hit below the URL.



In this Codeigniter 4 Bootstrap form validation tutorial, We have successfully validated form data on the server-side. After successfully validate data on the server-side, we send it to users on the success page.