Cash on delivery script, hides shipping address fields depending on method selected

cash-on-delivery-shipping-fields.js

//Don't forget about jQuery!
<script src="//code.jquery.com/jquery-1.11.2.min.js"></script>

<script>   
    if (1 || window.location.href.indexOf('key=showMeTheCheckoutMods') != -1) {	

	processCheckoutShippingPage = function() {
	    //prefill your desired data
		fields = {
			'address1':'Specify the address',
			'address2': '',
			'city': 'Name of the city',
			'state': 'Value for state',
			'country': 'Value for country',
			'zip': 'Zip code'
		};

		for (var i in fields) {
			jQuery('.ecwid-AddressForm-' + i)
			.closest('.ecwid-fieldWrapper')
			.find('input,select').val(fields[i]);
		}
		return true;
	};

    $(document).ready(function() {
        tickers = {};
        Ecwid.OnPageLoaded.add(function(page) {
            for (var i in tickers) {
                if (tickers[i]) {
                    clearInterval(tickers[i]);
                    tickers[i] = false;
                }
            }
            switch(page.type) {
                //if the page is Shipping address
                case 'CHECKOUT_SHIPPING_ADDRESS':
                tickers[page.type] = setInterval(processCheckoutShippingPage, 500);
                Ecwid.OnCartChanged.add(function(cart){
                    // if cash on delivery method selected
                	if (cart.shippingMethod == 'Cash on delivery') {
                	    //hide fields and prefill them with data
                		processCheckoutShippingPage();
                		$('#my-store-STOREID').addClass('ecwid-mod');
                	}	
                	else {
                	    // if shipping required, show address fields
                		$('#my-store-STOREID').removeClass('ecwid-mod');
                	}
                }); 
                break;
                
                //if page is payment details
                case 'CHECKOUT_PAYMENT_DETAILS':
                	Ecwid.OnCartChanged.add(function(cart){
                	// if cash on delivery method selected
                	if (cart.shippingMethod == 'Cash on delivery') {
                	    // apply CSS and prefill email block
                		$('#my-store-STOREID').addClass('ecwid-mod');
                		processPaymentDetailsPage();
                	}	
                	else {
                	    // if shipping required, do nothing
                		$('#my-store-STOREID').removeClass('ecwid-mod');
                	}
                }); 
                    break;
            }
        });
            
		processPaymentDetailsPage = function() {
            $('.ecwid-Checkout-EmailBlock input[name="email"]').val('Your desired email');
		}
    });
}
</script>