====== Dynamically Require Tax ID  ======

The following functionality allows you to dynamically require the tax ID depending on the country of the customer.

==== Add Javascript ====

From the configuration section of your store's FoxyCart administration, under "checkout" enable the "Add custom header and footer code" and within the footer textarea, paste the following:

<code javascript><script type="text/javascript">
function requireTaxID() {
 	var country = (FC.json.shipping_address.has_shippable_products) ? FC.json.shipping_address.country : FC.json.billing_address.country;
 	var tax_required = FC.json.required_fields.indexOf("billing_tax_id");
	if (country != "US" && tax_required == -1) {
		FC.json.required_fields.push('billing_tax_id');
		FC.json.config.template_config.custom_checkout_field_requirements['billing_tax_id'] = "required";
		FC.checkout.renderCustomerShipping();
		FC.checkout.renderCustomerBilling();
	} else if (country == "US" && tax_required > -1) {
		FC.json.required_fields.splice(tax_required, 1);
		FC.json.config.template_config.custom_checkout_field_requirements['billing_tax_id'] = "optional";
		FC.checkout.renderCustomerShipping();
		FC.checkout.renderCustomerBilling();
	}
}
if (FC.json.context == "checkout") {
	FC.client.on("customer-address-change", requireTaxID);
	FC.client.on("ready", requireTaxID);
}
</script></code>