Codeigniter 4 Ajax Image Upload Preview Example

Ajax image upload with preview in CodeIgniter 4; In this example, i will show you in detail on how to upload image file with preview and validation using jQuery ajax in Codeigniter 4 apps.

You must have used many apps. In which the preview of the image is shown before uploading it. Because, Previewing an image before uploading has become a common practice in any application.

If you want to upload the image and also show its preview without refreshing and reloading the web page. So for this you have to use Jquery Ajax. So that you can upload a preview of the image in your codeigniter 4 application.

And as well as, you will learn from scratch how to upload image with preview using jQuery and ajax in codeigniter 4 apps.

For the Codeigniter ajax image upload with preview tutorial, I’ll create a ajax image upload form with preview using jQuery ajax. And store image into database and codeigniter 4 apps directory.

Codeigniter 4 Ajax Image Upload and Image Preview Example

You can learn by following the steps given below on how to upload image file with preview and validation using jQuery ajax in Codeigniter 4 apps:

  • Install Codeigniter 4 Application
  • Basic App Configurations
  • Create Database and Table
  • Setup Database Credentials
  • Create Controller
  • Create Views
  • Setup Routes
  • Start Development server

Step 1 – Install Codeigniter 4 Application

First of all, you need to ownload the latest version of Codeigniter 4. So, visit this link Download Codeigniter 4 app and unzip the setup in your local system xampp/htdocs/ .

Note that, please change the download folder name “demo”.

Step 2 – Basic App Configurations

Now, you need to 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 and Table

Create a database and table by executing the following SQL query:


    id int(11) NOT NULL AUTO_INCREMENT COMMENT 'Primary Key',
    name varchar(100) NOT NULL COMMENT 'Name',
    type varchar(255) NOT NULL COMMENT 'file type',
    created_at varchar(20) NOT NULL COMMENT 'Created date',
    PRIMARY KEY (id)

Step 4 – Setup Database Credentials

To connect your codeigniter 4 app to the database. So, visit app/Config/ directory and open Database.php. Then add the databasae details like below into database.php file:

public $default = [
        'DSN'      => '',
        'hostname' => 'localhost',
        'username' => 'test',
        'password' => '4Mu99BhzK8dr4vF1',
        'database' => 'demo',
        'DBDriver' => 'MySQLi',
        'DBPrefix' => '',
        'pConnect' => false,
        'DBDebug'  => (ENVIRONMENT !== 'development'),
        'cacheOn'  => false,
        'cacheDir' => '',
        'charset'  => 'utf8',
        'DBCollat' => 'utf8_general_ci',
        'swapPre'  => '',
        'encrypt'  => false,
        'compress' => false,
        'strictOn' => false,
        'failover' => [],
        'port'     => 3306,

Step 5 – Create Controller

Create AjaxImageUpload.php file. So, visit app/Controllers directory and create AjaxImageUpload.php.Then add the following code into it:

namespace App\Controllers;
use CodeIgniter\Controller;
class AjaxImageUpload extends Controller
    public function index()
         return view('ajax_image_upload');
    public function upload()
        helper(['form', 'url']);
        $database = \Config\Database::connect();
        $builder = $database->table('images');

        $validateImage = $this->validate([
            'file' => [
                'mime_in[file, image/png, image/jpg,image/jpeg, image/gif]',
                'max_size[file, 4096]',
        $response = [
            'success' => false,
            'data' => '',
            'msg' => "Image could not upload"

        if ($validateImage) {
            $imageFile = $this->request->getFile('file');
            $imageFile->move(WRITEPATH . 'uploads');

            $data = [
                'img_name' => $imageFile->getClientName(),
                'file'  => $imageFile->getClientMimeType()

            $save = $builder->insert($data);

            $response = [
                'success' => true,
                'data' => $save,
                'msg' => "Image successfully uploaded"

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

The index() function renders the contact form template into the view.

The store() method handles the form of validation and contains various variables. And store image into db and directory.

Step 6 – Create Views

Create ajax_image_upload.php view file, so visit application/views/ directory and create ajax_image_upload.php file. Then add the following HTML into ajax_image_upload.php file:

<!DOCTYPE html>
<html lang="en">
	<meta charset="UTF-8">
	<title>Codeigniter 4 Ajax Image upload and Preview Demo -</title>
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
      .container { max-width: 750px }

    <div class="container mt-5">
        <form method="post" id="upload_image_form" enctype="multipart/form-data">

            <div id="alertMessage" class="alert alert-warning mb-3" style="display: none">
                <span id="alertMsg"></span>

            <div class="d-grid text-center">
               <img class="mb-3" id="ajaxImgUpload" alt="Preview Image" src="" />

            <div class="mb-3">
                <input type="file" name="file" multiple="true" id="finput" onchange="onFileUpload(this);"
                    class="form-control form-control-lg"  accept="image/*">

            <div class="d-grid">
               <button type="submit" class="btn btn-danger uploadBtn">Upload</button>

    <script src=""></script>
        function onFileUpload(input, id) {
            id = id || '#ajaxImgUpload';
            if (input.files && input.files[0]) {
                var reader = new FileReader();

                reader.onload = function (e) {

        $(document).ready(function () {
            $('#upload_image_form').on('submit', function (e) {

                $('.uploadBtn').html('Uploading ...');

                if ($('#file').val() == '') {
                    alert("Choose File");
                } else {
                        url: "<?php echo base_url(); ?>/AjaxImageUpload/upload",
                        method: "POST",
                        data: new FormData(this),
                        processData: false,
                        contentType: false,
                        cache: false,
                        dataType: "json",
                        success: function (res) {
                            if (res.success == true) {
                                $('#ajaxImgUpload').attr('src', '');
                            } else if (res.success == false) {
                            setTimeout(function () {
                            }, 4000);



This form has been created. This will show a preview of the image using Jquery before uploading it. and using the ajax, will upload the image without refresh or reload the web page.

Step 7 – Setup Routes

To define a route, So, visit app/Config/ directory and open Routes.php file. Then add the following routes into it:

$routes->get('/', 'AjaxImageController::index');

Note that, the routes will be displaying the image upload form and submitting the data in the database on successful form submission.

Step 8 – Start Development server

Execute the following command into command prompt or terminal to start the codeigniter 4 application:

php spark serve

Then visit your web browser and hit the following url on it:





CodeIgniter 4 ajax image upload preview with validation example tutorial. In this example,you have learned how to upload image preview and validation using jQuery ajax in Codeigniter 4 apps.

Recommended CodeIgniter 4 Tutorial

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  3. Codeigniter 4 Form Validation Example Tutorial
  4. How to add jQuery Validation on Form in Codeigniter 4 Example
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  7. Image Upload with Validation in Codeigniter 4
  8. Codeigniter 4 Image Upload Preview Example

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