ajax in admin menu

Question

Following the tutorial listed here, I'm the data isn't being saved to the user meta I'm trying to set. The process itself seems simple enough, but the meta data isn't being saved. I don't get any console errors and the little success animation I have runs when I run the jQuery script.

<?php
    add_action( 'admin_footer', 'ring_jquery' );

    function ring_jquery() {
?>
<script type="text/javascript">
    jQuery('.ring-submit').on('click', function(){
        var u = jQuery(this).attr('user'),
            c = jQuery('.agt_ringc[user="'+u+'"]').val(),
            x = jQuery('.agt_ringx[user="'+u+'"]').val(),
            formData = 'ringu='+u+'&ringc='+c+'&ringx='+x;
        jQuery.ajax({
            url: '<?php echo admin_url('admin-ajax.php'); ?>',
            type: 'POST',
            data: formData,
            success: function(e){

                jQuery('.success[user="'+u+'"]').fadeIn(400).delay(400).fadeOut(400);

            },
            error: function(){

                jQuery('.fail[user="'+u+'"]').fadeIn(400).delay(400).fadeOut(400);

            }
        });
    });

</script>
<?php
} //End ring_jquery()

add_action('wp_ajax_my_action', 'ring_callback');

function ring_callback() {
    global $wpdb; // this is how you get access to the database

    $ringu = $_POST['ringu'];
    $ringc = $_POST['ringc'];
    $ringx = $_POST['ringx'];

    update_user_meta($ringu,'agt_ringc',$ringc);
    update_user_meta($ringu,'agt_ringx',$ringx);

    die(); // this is required to return a proper result
}
?>

Answer 1

add_action('wp_ajax_ring_callback', 'ring_callback');

Should be the hook you must be using to enable ring_callback function call.