AJAX File Upload using Codeigniter, jQuery

Introduction

I will show you an example on Ajax file upload using Codeigniter jQuery without page refresh. This file upload tutorial example is very helpful to implement the upload functionality. In this example the file is selected using the browse button and file is uploaded to the uploads directory. Codeigniter controller stores the file into the specified location and returns response as a success or failure message from the controller. As a validation step I have checked if end users have selected a file for uploading or not.

You may also like to read below tutorials on file upload examples:

AJAX Multiple Files Upload using PHP, jQuery

AJAX File Upload using PHP, jQuery

Prerequisites

PHP 7.0.15
Apache 2.4
Codeigniter 3.1.10

Example with Source Code

Creating Project Directory

A typical directory structure for the project Ajax file upload using Codeigniter jQuery would be by creating a project directory called codeigniter-3.1.10-jquery-ajax-file-upload. We will create another directory called uploads directory under project directory to hold all uploaded files.

Configuring Auto-load

Now modify codeigniter-3.1.10-jquery-ajax-file-upload/application/config/autoload.php file for auto-loading html, url, file, form.

This is one time activity and once you load you can use uniformly throughout the application code.

$autoload['helper'] = array('html', 'url', 'file', 'form');

Creating Controller Class

Create a controller file AjaxFileUpload.php under codeigniter-3.1.10-jquery-ajax-file-upload/application/controllers with the following source code.

This controller class is responsible for handling request and response of clients and any validation or business logic as applicable.

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

/**
 * Description of ajaxupload
 *
 * @author https://roytuts.com
 */
class AjaxFileUpload extends CI_Controller {

    function __construct() {
        parent::__construct();
    }

    function index() {
        $this->load->view('file_upload_ajax', NULL);
    }

    function upload_file() {

        //upload file
        $config['upload_path'] = 'uploads/';
        $config['allowed_types'] = '*';
        $config['max_filename'] = '255';
        $config['encrypt_name'] = TRUE;
        $config['max_size'] = '1024'; //1 MB

        if (isset($_FILES['file']['name'])) {
            if (0 < $_FILES['file']['error']) {
                echo 'Error during file upload' . $_FILES['file']['error'];
            } else {
                if (file_exists('uploads/' . $_FILES['file']['name'])) {
                    echo 'File already exists : uploads/' . $_FILES['file']['name'];
                } else {
                    $this->load->library('upload', $config);
                    if (!$this->upload->do_upload('file')) {
                        echo $this->upload->display_errors();
                    } else {
                        echo 'File successfully uploaded : uploads/' . $_FILES['file']['name'];
                    }
                }
            }
        } else {
            echo 'Please choose a file';
        }
    }

}

Creating View

Create a view file file_upload_ajax.php under codeigniter-3.1.10-jquery-ajax-file-upload/application/views. Here we have shown how to use ajax file upload using codeigniter jquery.

This file is responsible for giving user options to select and upload file.

The below view file has one input button for file type and another button for submission once the file is selected for uploading.

Then we catch the button’s onClick event through jQuery and upload the file at appropriate destination in the server location.

Finally we display either success or failure message as we receive from the server through success or error methods respectively.

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>AJAX File upload using Codeigniter, jQuery</title>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
        <script type="text/javascript">
            $(document).ready(function (e) {
                $('#upload').on('click', function () {
                    var file_data = $('#file').prop('files')[0];
                    var form_data = new FormData();
                    form_data.append('file', file_data);
                    $.ajax({
                        url: 'http://localhost/codeigniter-3.1.10-jquery-ajax-file-upload/index.php/ajaxfileupload/upload_file', // point to server-side controller method
                        dataType: 'text', // what to expect back from the server
                        cache: false,
                        contentType: false,
                        processData: false,
                        data: form_data,
                        type: 'post',
                        success: function (response) {
                            $('#msg').html(response); // display success response from the server
                        },
                        error: function (response) {
                            $('#msg').html(response); // display error response from the server
                        }
                    });
                });
            });
        </script>
    </head>
    <body>
        <p id="msg"></p>
        <input type="file" id="file" name="file" />
        <button id="upload">Upload</button>
    </body>
</html>

Configuring Route

Modify file codeigniter-3.1.10-jquery-ajax-file-upload/application/config/routes.php file because we want our above controller class to be default to load the view file for uploading file.

$route['default_controller'] = 'ajaxfileupload';

Testing the Application

If everything is fine then run the application by hitting the URL
http://localhost/codeigniter-3.1.10-jquery-ajax-file-upload/index.php. You will get the output in the browser.

ajax file upload using codeigniter jquery

If you try to upload file without selecting any file then you would see error message “Please choose a file“.

ajax file upload using codeigniter jquery

If the file successfully uploaded then you will see success message “File successfully uploaded : uploads/<some-file-name>“.

ajax file upload using codeigniter jquery

If the file you are trying to upload already exists then you will see a message “File already exists : uploads/<some-file-name>“.

Hope you have got an idea on ajax file upload file using Codeigniter  jQuery.

Source Code

You can download source code.

Thanks for reading.

AJAX File Upload using Codeigniter, jQuery

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