Shipping method selector behaviors

shipmethod.js

/*!
 * shipmethods.js - Shopp catalog behaviors library
 * Copyright © 2008-2013 by Ingenesis Limited
 * Licensed under the GPLv3 {@see license.txt}
 */
$('#shopp form').on('change', '.shipmethod', function () {
	var prefix = '.shopp-cart.cart-',
		spans = 'span'+prefix,
		inputs = 'input'+prefix,
		fields = ['shipping','tax','total'],
		selectors = [],
		values = {},
		retry = 0,
		disableset = '.shopp .shipmethod, .payoption-button input',
		$this = $(this),
		send = function () {
			$(disableset).attr('disabled',true);
			$.getJSON($co.ajaxurl +"?action=shopp_ship_costs&method=" + $this.val(), function (r) {
				if ( ! r && retry++ < 2 ) return setTimeout(send, 1000);
				$(disableset).attr('disabled', false);
				$.each(fields, function (i, name) {
					if ( ! r || undefined == r[name] ) {
						$(spans+name).html(values[name]);
						return;
					}
					$(spans+name).html(asMoney(new Number(r[name])));
					$(inputs+name).val(new Number(r[name]));
				});
			});
		};

	$.each(fields, function (i, name) {
		selectors.push(spans + name);
		values[name] = $(spans + name).html();
	});
	if (!c_upd) c_upd = '?';
	$(selectors.join(',')).html(c_upd);
	send();
});