I've setup the basic wordpress ajax example in my wp theme. The trigger is made by modernizr.js checking the media queries on the page.

jQuery(document).ready(function($) {

    if(Modernizr.mq('only all and (max-width:6300px)')) {

        var data = {

        action: 'my_action',

        whatever: ajax_object.we_value      // We pass php values differently!

    };

    // We can also pass the url value separately from ajaxurl for front end AJAX implementations

        jQuery.post(ajax_object.ajax_url, data, function(data) {

            $(#trending-Container).html(data).fadeIn(1000);

        });

    }



});//end function 

I have localized and enqueue'd my scripts.

wp_enqueue_script('mainJS', get_template_directory_uri() . '/js/mainJS.js', array(jquery) );

wp_localize_script( 'mainJS', 'ajax_object', 

                    array( 'ajax_url' => admin_url( 'admin-ajax.php' ), 'we_value' => 1234 ) );

and finally the function that handles the request is:

add_action('wp_ajax_my_action', 'my_action_callback');

add_action('wp_ajax_nopriv_my_action', 'my_action_callback');

function my_action_callback() {

        global $wpdb;

            $whatever = intval( $_POST['whatever'] );

            $whatever += 10;

                echo $whatever;

            die();



        }

This constantly gives me a response of 0 (no properties) and I do not know why.
P.S This is all local.

Status code 200

Host:lart.co.uk

Origin:http://lart.co.uk

Referer:http://lart.co.uk/

User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/28.0.1500.71 Chrome/28.0.1500.71 Safari/537.36

X-Requested-With:XMLHttpRequest

Form Dataview sourceview URL encoded

action:my_action

whatever:1234