Call a Wordpress shortcode with AJAX

I have a shortcode in Wordpress which I want to call it with jQuery with the click of a button. I read a few websites and tutorials, but I cannot figure exactly what happen.

I put this on function.php:

add_action( 'init', function() { 
  ps_register_shortcode_ajax( 'ps_get_survey_form', 'ps_get_survey_form' ); 
} );

function ps_register_shortcode_ajax( $callable, $action ) {

  if ( empty( $_POST['action'] ) || $_POST['action'] != $action )
    return;

  call_user_func( $callable );
}

function ps_get_survey_form() {
    echo do_shortcode( '[dopbsp id=6 lang=el]' );
    die(); 
} 

And this on the page-template.php I use:

<button id="testonclick" onclick="test()"></button>

<div id="testresults"></div>

<script>

function test() {
    jQuery.ajax({
        url: "http://localhost/myweb" + "/wp-admin/admin-ajax.php",
        data : {action: 'ps_get_survey_form'},
        success: function(results){
            jQuery("#testresults").html(results)
        },
        error: function(errorThrown){console.log(errorThrown);}
    });// end of ajax
}
</script>

However, the results is 0. Any idea what happened wrong?