Melhora bloqueio da tela.

public/js/wc-fvc-public.js

@@ -1,28 +1,66 @@
 (function( $ ) {
 	'use strict';
 
-	$(function() {
-		$( document.body ).on( 'submit', '.woocommerce-shipping-calculator', function() {
-			var cep = $('#calc_shipping_postcode').val();
-
-			$.ajax({
-				type: 'GET',
-				url: wc_ajax_url,
-				async: false,
-				data: {
-					'wc-ajax': 'correios_autofill_address',
-					'postcode': cep,
-				},
-				dataType: 'json',
-				contentType: 'application/json',
-				success: function( address ) {
-					if ( address.success ) {
-						$('#calc_shipping_state').val(address.data.state).change();
-						$('#calc_shipping_city').val(address.data.city).change();
-					}
-				},
+	var WC_Fvc = {
+		/**
+		 * Initialize actions.
+		 */
+		init: function() {
+			$( document.body ).on( 'submit', '.woocommerce-shipping-calculator', function(event) {
+				event.preventDefault();
+
+				WC_Fvc.block();
+
+				var cep = $('#calc_shipping_postcode').val();
+
+				$.ajax({
+					type: 'GET',
+					url: wc_ajax_url,
+					async: false,
+					data: {
+						'wc-ajax': 'correios_autofill_address',
+						'postcode': cep,
+					},
+					dataType: 'json',
+					contentType: 'application/json',
+					success: function( address ) {
+						if ( address.success ) {
+							$('#calc_shipping_state').val(address.data.state).change();
+							$('#calc_shipping_city').val(address.data.city).change();
+						}
+					},
+				});
+			});
+		},
+
+		/**
+		 * Block shipping form.
+		 */
+		block: function() {
+			$('.woocommerce-shipping-calculator, div.cart_totals')
+			.addClass('processing')
+			.block({
+				message: null,
+				overlayCSS: {
+					background: '#fff',
+					opacity: 0.6,
+				}
 			});
-		});
+		},
+
+		/**
+		 * Unblock checkout.
+		 */
+		unblock: function() {
+			$('.woocommerce-shipping-calculator, div.cart_totals')
+			.removeClass('processing')
+			.unblock();
+		},
+	};
+
+
+	$(function() {
+		WC_Fvc.init();
 	});
 
 })( jQuery );