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Inside this article we will see the concept i.e CodeIgniter 4 Redirection with Form Inputs Example Tutorial. Article contains the classified information about CodeIgniter 4 Redirection with Form data.

If you are looking for a solution i.e How to pass a data with redirect in codeigniter then this article will help you a lot for this. Tutorial is super easy to understand and implement it in your code as well.

Sometimes we need to get the form data back to input fields what user submitted, so this article will help to get that concept.

Let’s get started.

CodeIgniter 4 Installation

To create a CodeIgniter 4 setup run this given command into your shell or terminal. Please make sure composer should be installed.

$ composer create-project codeigniter4/appstarter codeigniter-4

Assuming you have successfully installed application into your local system.

Environment (.env) Setup

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

Either we can do via renaming file as simple as that. Also we can do by terminal command.

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.

Enable Development Mode

CodeIgniter starts up in production mode by default. You need to make it in development mode to see any error if you are working with application.

Open .env file from root.

# CI_ENVIRONMENT = production

 // Do it to 
 
CI_ENVIRONMENT = development

Now application is in development mode.

Create Database

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

We will use MySQL command to create database. Run this command into Sql tab of PhpMyAdmin.

CREATE DATABASE codeigniter4_app;

Successfully, we have created a database.

Database Connection

Open .env file from project root.

Search for DATABASE. You should see the connection environment variables into it. Put your updated details of database connection string values.

 
#--------------------------------------------------------------------
# DATABASE
#--------------------------------------------------------------------

database.default.hostname = localhost
database.default.database = codeigniter4_app
database.default.username = admin
database.default.password = admin
database.default.DBDriver = MySQLi
database.default.DBPrefix =
database.default.port = 3306

Now, database successfully connected with the application.

Create Migration

Open project into terminal and run this command to create migration file.

$ php spark make:migration add_blogs

It will create a file –

Migration file – 2022-09-07-031252_AddBlogs.php inside /app/Database/Migrations folder.

Open Migration file and write this complete code into it.

<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class AddBlogs extends Migration
{
	public function up()
	{
		$this->forge->addField([
			'id' => [
				'type' => 'INT',
				'constraint' => 5,
				'unsigned' => true,
				'auto_increment' => true,
			],
			'title' => [
				'type' => 'VARCHAR',
				'constraint' => 50,
				'null' => false
			],
			'author_name' => [
				'type' => 'VARCHAR',
				'constraint' => 150,
				'null' => false
			],
			'description' => [
				'type' => 'TEXT',
				'null' => true
			]
		]);
		$this->forge->addPrimaryKey('id');
		$this->forge->createTable('blogs');
	}

	public function down()
	{
		$this->forge->dropTable('blogs');
	}
}

Run Migration

Next,

We need to create table inside database.

$ php spark migrate

This command will create table – blogs inside database.

Create Model & Controller

Next,

We need to create a model and a controller file.

Model File

$ php spark make:model Blog

It will create a model Blog.php inside /app/Models folder.

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

<?php

namespace App\Models;

use CodeIgniter\Model;

class Blog extends Model
{
	protected $DBGroup              = 'default';
	protected $table                = 'blogs';
	protected $primaryKey           = 'id';
	protected $useAutoIncrement     = true;
	protected $insertID             = 0;
	protected $returnType           = 'array';
	protected $useSoftDelete        = false;
	protected $protectFields        = true;
	protected $allowedFields        = [
		"title",
		"author_name",
		"description"
	];

	// 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          = [];
}

Controller File

To create a controller, run this command.

$ php spark make:controller BlogController

It will create BlogController.php inside /app/Controllers folder.

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

<?php

namespace App\Controllers;

use App\Controllers\BaseController;
use App\Models\Blog;

class BlogController extends BaseController
{
	public function index()
	{
		return view('blog-form');
	}

	public function submitData()
	{
		$input = $this->request->getVar();

		$blogObject = new Blog();

		$data = [
			'title' => $input['title'],
			'author_name'    => $input['author_name'],
			'description' => $input['description']
		];

		$blogObject->insert($data);

		return redirect()->to('form')->with('success', 'Data saved successfully')->withInput(); 
	}
}

Create Template File

Go to /app/Views folder and create a file with name blog-form.php

Open blog-form.php and write this complete code into it.

<html lang="en">

<head>
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet">
</head>

<body>
    <div class="container" style="margin-top: 20px;">
        <div class="row">
            <div class="col-md-12">
                <?php if (session()->getFlashdata('success')) { ?>
                    <div class="alert alert-success">
                        <?php echo session()->getFlashdata('success'); ?>
                    </div>
                <?php } ?>

                <h4 class="text-center">CodeIgniter 4 Redirection with Form Inputs Example Tutorial</h4><br>
                <form method="post" action="<?php echo site_url('submit-data') ?>" class="form form-horizontal">
                    <div class="form-group">
                        <label>Title</label>
                        <input type="text" name="title" class="form-control" value="<?php echo old('title'); ?>"/>
                    </div>
                    <div class="form-group">
                        <label>Description</label>
                        <textarea class="form-control" id="description-ckeditor" name="description"> <?php echo old('description'); ?></textarea>
                    </div>
                    <div class="form-group">
                        <label>Author Name</label>
                        <input type="text" name="author_name" class="form-control" value="<?php echo old('author_name'); ?>"/>
                    </div>
                    <div class="form-group">
                        <input type="submit" value="Submit" class="btn btn-primary" />
                    </div>
                </form>
            </div>
        </div>
    </div>
    <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
    <script src="https://cdn.ckeditor.com/4.15.1/standard/ckeditor.js"></script>
    <script>
        CKEDITOR.replace('description-ckeditor');
    </script>
</body>

</html>

Add Route

Open Routes.php from /app/Config folder and add these route into it.

//...

$routes->get("form", "BlogController::index");
$routes->post("submit-data", "BlogController::submitData");

//...

Application Testing

Open project terminal and start development server via command:

$ php spark serve

URL: http://localhost:8080/form

Provide input values into form

Click on Submit button to save form data

You can see, form redirects back after submission but with inputs.

You should see data saved inside blogs table.

We hope this article helped you to learn CodeIgniter 4 Redirection with Form Inputs Example Tutorial in a very detailed way.

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