CodeIgniter AJAX Helper

Posted by teejay on November 13, 2009

This is a quick post on how to recognize AJAX Requests.

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

function is_ajax()
{
    return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest';
}

?>

Copy the following code into a file. Save the file as ajax_helper.php and save in your application/helpers/ folder.

Load it if you need if by:

Normal loading

This is pretty much how we normally include helpers. This is the best approach unless you would use the ajax helper most of the time.

$this->load->helper('ajax');

Autoloading

Open your config.php file located at application/config/. Look for this line.

$autoload['helper'] = array();

Add yours to the list

$autoload['helper'] = array('ajax');

You should not add _helper when adding it to the autoload['helper'] array.

Categories: How To, Web Development

Tags: codeigniter, php

28 Comments

erick

Thanks sa helper

November 26th 2009

Thorpe Obazee

@erick. No problem. I’m glad this post helped you.

November 26th 2009

Mei

great stuff, but an better implementation (IMHO) is to use it as an extension of the input class. Have it as a method in MY_Input.php and it will be loaded automatically.

It can then be used as $this->input->isAjax() in your controllers.

December 11th 2009

Mei

@Mei.There are numerous ways to do this and yours is a good way.

December 17th 2009

Elizabeth

I have been trying to use this, and it works just fine when I load it in the controller. But I am unable to autoload this helper and the standard Session library. I get a “headers already sent” error every time I try to do both. I can autoload either one alone, or I can autoload one and load the other in the controllers.

Any ideas?

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