Wordpress ajax calls

ajax.js

var form = $('#form'),
url = crimesmap_ajax.ajaxurl;
$.post(
	url,
	{
		'postCommentNonce' : crimesmap_ajax.postCommentNonce,
		'action' : crimesmap_ajax.action_call,
		'data' : $('#form').serializeArray(),
	}, 
	function(ret) {

	}
	, 'json');

functions.php

<?php

add_action( 'wp_enqueue_scripts', 'so_enqueue_scripts' );
function so_enqueue_scripts()
{
  wp_register_script( 'ajaxHandle', get_template_directory_uri() . '/assets/js/ajax.js', array(), false, true );
  wp_enqueue_script( 'ajaxHandle' );
  wp_localize_script( 'ajaxHandle', 'this_theme_ajax', array( 
    'ajaxurl' => admin_url( 'admin-ajax.php' ), 
    'postCommentNonce' => wp_create_nonce( 'uk_crimemaps_nonce' ),
    'action_call' => 'myaction',
    ) );
}

add_action( 'wp_ajax_neighbours_action', 'neighbours_wp_ajax_function' );
add_action( 'wp_ajax_nopriv_neighbours_action', 'neighbours_wp_ajax_function' );
function neighbours_wp_ajax_function()
{
    //mark headers to have a json reponse
    header("Content-type: application/json");
   	$force = isset($_POST['force']) ? $_POST['force'] : 'leicestershire';
   	$neighbourhoods =  Ukcrimemap::neighbourhoods($force);
   	
   	echo json_encode($neighbourhoods);
    die();
}