ExpressionEngine plugin for checking if a request is an ajax one in a template.

pi.is_ajax.php

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

/**
 * Is Ajax Class
 *
 * @package     ExpressionEngine
 * @category    Plugin
 * @author      Abban Dunne
 * @copyright   Copyright (c) 2012, Webtogether
 * @license     MIT
 * @link        http://www.webtogether.ie/
 */

$plugin_info = array(
  'pi_name'         => 'Is Ajax',
  'pi_version'      => '1.0',
	'pi_author'       => 'Abban Dunne',
	'pi_author_url'   => 'http://www.webtogether.ie/',
	'pi_description'  => 'Returns true or false depending on if the current request is an ajax one.',
	'pi_usage'        => Is_ajax::usage()
);

class Is_ajax{

	public $return_data = '';

	public function __construct(){

		$this->EE =& get_instance();

        $tagdata =  $this->EE->TMPL->tagdata;

        $conds['ajax'] = (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest');

        $tagdata = $this->EE->functions->prep_conditionals($tagdata, $conds); 
        
        $tagdata = $this->EE->TMPL->swap_var_single("ajax", $conds['ajax'], $tagdata); 
        
        $this->return_data = $tagdata;

	}

	/**
	 * Usage
	 *
	 * This function describes how the plugin is used.
	 *
	 * @access  public
	 * @return  string
	 */
	public static function usage(){
		ob_start(); ?>

		You use the plugin like this:
		{exp:is_ajax}
		{if ajax}
			Do stuff
		{if:else}
			Do other stuff
		{/if}
		{/exp:is_ajax}
		<?php $buffer = ob_get_contents();
		ob_end_clean();
		return $buffer;
	}

}

/* End of file pi.is_ajax.php */
/* Location: ./system/expressionengine/third_party/is_ajax/pi.is_ajax.php */