Codeigniter 4 Ajax Image Upload with Preview Example

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CodeIgniter 4 tutorial upload the image file using jquery ajax. Here, you will learn how to upload the image using jQuery ajax in Codeigniter 4 projects with preview.

In this tutorial, we will teach you how to use jQuery Ajax to upload images in the Codeigniter 4 project. Also, how can you upload images from jQuery Ajax without refreshing and reloading the whole web page of your CodeIgniter 4 application.

CodeIgniter 4 Ajax Image Upload With Preview Example

Follow the below steps and easily upload the image using jQuery ajax in folder and store into the database in CodeIgniter 4 projects with preview:

  • Download Codeigniter Latest
  • Basic Configurations
  • Create Database With Table
  • Setup Database Credentials
  • Create 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 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, 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';
To
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 files ( 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) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='demo table' AUTO_INCREMENT=1;

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 Controller

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

  • Index() – This is used to display file/image upload form.
  • Store() – This is used to validate form file/image on server-side and store into MySQL database and folder.
<?php namespace App\Controllers; use CodeIgniter\Controller; class Form extends Controller
{ public function index() { return view('form'); } public function store() { helper(['form', 'url']); $db = \Config\Database::connect(); $builder = $db->table('file'); $validated = $this->validate([ 'file' => [ 'uploaded[file]', 'mime_in[file,image/jpg,image/jpeg,image/gif,image/png]', 'max_size[file,4096]', ], ]); $response = [ 'success' => false, 'data' => '', 'msg' => "Image has not been uploaded successfully" ]; if ($validated) { $avatar = $this->request->getFile('file'); $avatar->move(WRITEPATH . 'uploads'); $data = [ 'name' => $avatar->getClientName(), 'type' => $avatar->getClientMimeType() ]; $save = $builder->insert($data); $response = [ 'success' => true, 'data' => $save, 'msg' => "Image has been uploaded successfully" ]; } return $this->response->setJSON($response); }
}

Step 6: Create Views

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

<!DOCTYPE html>
<html>
<head>
<title>Codeigniter 4 Ajax Image upload with preview Example</title>
</head>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<style type="text/css">
#blah {
width: 600px;
height: 300px;
border: 2px solid;
display: block;
margin: 10px;
background-color: white;
border-radius: 5px;
box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
transition: all 0.3s cubic-bezier(.25,.8,.25,1);
overflow: hidden;
}
</style>
<body>
<div class="container">
<div class="row">
<form method="post" id="upload_form" enctype="multipart/form-data"> <div class="col-md-7">
<h1> codeigniter 4 tutorial upload image file using jquery ajax </h1></br>
<div id="divMsg" class="alert alert-success" style="display: none">
<span id="msg"></span>
</div>
<img id="blah" src="//www.tutsmake.com/ajax-image-upload-with-preview-in-codeigniter/" alt="your image" /></br></br>
<input type="file" name="file" multiple="true" accept="image/*" id="finput" onchange="readURL(this);"></br></br>
<button class="btn btn-success">Submit</button>
</div>
<div class="col-md-5"></div>
</form>
</div>
</div>
<script>
function readURL(input, id) {
id = id || '#blah';
if (input.files &amp;&amp; input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$(id)
.attr('src', e.target.result)
.width(200)
.height(150);
};
reader.readAsDataURL(input.files[0]);
}
}
$(document).ready(function(){ $('#upload_form').on('submit', function(e){ $('.btn-success').html('sending');
$('.btn-success').prop('disabled');
e.preventDefault(); if($('#file').val() == '') { alert("Please Select the File"); $('.btn-success').html('submit');
$('.btn-success').prop('enabled'); document.getElementById("upload_form").reset(); } else { $.ajax({ url:"<?php echo base_url(); ?>form/store", method:"POST", data:new FormData(this), contentType: false, cache: false, processData:false, dataType: "json",
success:function(res) { console.log(res.success);
if(res.success == true){
$('#blah').attr('src','//www.tutsmake.com/ajax-image-upload-with-preview-in-codeigniter/'); $('#msg').html(res.msg); $('#divMsg').show(); }
else if(res.success == false){
$('#msg').html(res.msg); $('#divMsg').show(); }
setTimeout(function(){
$('#msg').html('');
$('#divMsg').hide(); }, 3000);
$('.btn-success').html('submit');
$('.btn-success').prop('enabled');
document.getElementById("upload_form").reset(); } }); } }); }); </script> </body>
</html>

This below line display error messages on your web page:

<div id="divMsg" class="alert alert-success" style="display: none">
<span id="msg"></span>
</div>

This below javascript code show preview of your image before upload to server in codeigniter 4 projects:

function readURL(input, id) {
id = id || '#blah';
if (input.files &amp;&amp; input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$(id)
.attr('src', e.target.result)
.width(200)
.height(150);
};
reader.readAsDataURL(input.files[0]);
}
}

The below given ajax code is used to upload image into the server in codeigniter 4 projects. So include this code into your web page:

$(document).ready(function(){ $('#upload_form').on('submit', function(e){ $('.btn-success').html('sending');
$('.btn-success').prop('disabled');
e.preventDefault(); if($('#file').val() == '') { alert("Please Select the File"); $('.btn-success').html('submit');
$('.btn-success').prop('enabled'); document.getElementById("upload_form").reset(); } else { $.ajax({ url:"<?php echo base_url(); ?>public/index.php/form/store", method:"POST", data:new FormData(this), contentType: false, cache: false, processData:false, dataType: "json",
success:function(res) { console.log(res.success);
if(res.success == true){
$('#blah').attr('src','//www.tutsmake.com/ajax-image-upload-with-preview-in-codeigniter/'); $('#msg').html(res.msg); $('#divMsg').show(); }
else if(res.success == false){
$('#msg').html(res.msg); $('#divMsg').show(); }
setTimeout(function(){
$('#msg').html('');
$('#divMsg').hide(); }, 3000);
$('.btn-success').html('submit');
$('.btn-success').prop('enabled');
document.getElementById("upload_form").reset(); } }); } }); });

Step 7: Start Development server

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

http://localhost/demo/public/index.php/form

Conclusion

In this Codeigniter 4 ajax image upload with preview example tutorial. You have learned how to upload image in CodeIgniter 4 projects using jQuery ajax with preview.

If you have any questions or thoughts to share, use the comment form below to reach us.

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