Add the ability to enter coupon codes to the FoxyCart v060 checkout

foxycart.checkout.coupons.js

// FOR TESTING PURPOSES ONLY

FC.checkout.InitCoupon = function() {
	fc_cart_foot_discount_new = '<tr id="fc_cart_foot_discount_new"><td class="fc_col1" colspan="2"><a href="#" onclick="FC.checkout.AddCoupon(); this.blur(); return false;">Add a coupon</a></td><td class="fc_col2"><input type="text" name="coupon" id="fc_coupon" class="fc_text fc_text_short" value="" style="display:none;" /><a id="fc_coupon_apply" href="javascript:;" style="display:none;">Apply!</a></td></tr>';

	if (jQuery('#fc_cart_foot_discount_new').length == 0) {
		jQuery(fc_cart_foot_discount_new).insertBefore('#fc_cart_foot_shipping');
	}

	jQuery('#fc_coupon_apply').unbind('click').click(function(){
		coupon = jQuery('#fc_coupon').val();
		if (coupon != '') {
			FC.checkout.ApplyCoupon(coupon);
		} else {
			alert('Please enter a coupon code.');
		}
	});
}

FC.checkout.AddCoupon = function() {
	jQuery("#fc_coupon, #fc_coupon_apply").toggle();
	if (jQuery("#fc_coupon").is(":visible")) {
		jQuery("#fc_coupon")[0].focus();
	}
}

FC.checkout.ApplyCoupon = function(coupon) {
	jQuery('#fc_coupon_apply').html('Loading...');
	console.info('getJSON?');
	jQuery.getJSON('https://' + window.location.hostname + '/cart?output=json&' + FC.checkout.config.session + '&coupon=' + coupon + '&callback=?',
		function(data) {
			console.info(data);
			if (data.messages.errors.length > 0) {
				alert("We're sorry. An error occurred: " + data.messages.errors[0]);
			} else {
				console.info('Coupon: ' + data.coupons);
				FC.checkout.BuildCouponTR(data.coupons);
			}
			jQuery('#fc_coupon_apply').html('Apply!');
		}
	);
}

FC.checkout.BuildCouponTR = function(coupons) {
	console.info('Coupons: ' + coupons)
	fc_cart_foot_discounts = '';
	FC.checkout.config.orderDiscount = 0;
	for (coupon in coupons) {
		fc_cart_foot_discounts += '<tr class="fc_cart_foot_discount"><td class="fc_col1" colspan="2">' + coupon + ':</td><td class="fc_col2"><span class="fc_discount">' + FC.formatter.currency(coupons[coupon], true) + '</span></td></tr>';
		FC.checkout.config.orderDiscount += coupons[coupon];
	}
	jQuery(fc_cart_foot_discounts).insertAfter('#fc_cart_foot_subtotal');
	// Set the subtotal amounts
	jQuery('#discount, label[for=discount]').remove();
	if (FC.checkout.config.orderDiscount != 0) {
		discount_total = '<li class="fc_row fc_discount"><label for="discount" class="fc_pre">Discount</label><input type="text" name="discount" id="discount" class="fc_text fc_text_short fc_text_readonly" readonly="readonly" onfocus="this.blur()" value="' + FC.formatter.currency(FC.checkout.config.orderDiscount) + '" /></li>';
		jQuery(discount_total).insertAfter('li.fc_shipping_cost');
	}
	FC.checkout.updatePriceDisplay();
}


jQuery(document).ready(function(){
	FC.checkout.InitCoupon();
});