[B00MER]

I've modified the original code to take Canada into consideration and allow both US and CA zipcodes to be utilized.

Edit Cart.php locate:

$intershipper_recalc = "Y";

BEFORE this add:

# prelogin calculator start
# modified by cart-lab.com to allow US and CA zipcodes
x_session_register("zipcode_estimate"); 
$trusted_post_variables = array("zip_estimate");
require $xcart_dir."/include/states.php";
if($HTTP_GET_VARS['zip_estimate'] == "clear"){ 
      $zipcode_estimate = ""; 
      func_header_location("cart.php"); 
      } 
    
if(!empty($zip_estimate)){ 
      $zipcode_estimate = $zip_estimate; 
       
      #$count = substr_count($zipcode_estimate,"0") + substr_count($zipcode_estimate,"1") + substr_count($zipcode_estimate,"2") + substr_count($zipcode_estimate,"3") + substr_count($zipcode_estimate,"4") + substr_count($zipcode_estimate,"5") + substr_count($zipcode_estimate,"6") + substr_count($zipcode_estimate,"7") + substr_count($zipcode_estimate,"8") + substr_count($zipcode_estimate,"9"); 
      $count = strlen($zipcode_estimate);

      if($count < 4){  //checking for 5 digits 
          $zipcode_estimate = "";} 
             
       func_header_location("cart.php"); 
      } 
if($zipcode_estimate != ""){ 
	$count = strlen($zipcode_estimate);
		if($count == 5) {
      $config["General"]["apply_default_country"] = "Y"; 
      $config["General"]["default_zipcode"] = $zipcode_estimate; 
      $userinfo["s_zipcode"] = $zipcode_estimate;
      $smarty->assign("estimate","NO"); 
    } else {
		  $config["General"]["apply_default_country"] = "Y"; 
		  $config["General"]["default_country"] = "CA";
		  $config["General"]["default_zipcode"] = $zipcode_estimate; 
		  $userinfo["s_country"] = "CA";
		  $userinfo["s_zipcode"] = $zipcode_estimate;
		  $smarty->assign("estimate","NO");     		    	
    }
     
      } 

# prelogin calculator end

Now onto the .tpl, edit skin1/customer/main/cart_totals.tpl and locate:

<input type=hidden name=paymentid value="{$smarty.get.paymentid|escape:"html"}">

BEFORE this line add:

{* Shipping Estimate *}

{*{if $not_logged_message eq "1"}{$lng.txt_order_total_msg}{/if}*}

{if $login eq ""} 

{if $estimate ne "NO"} 

Enter your zip code to estimate shipping charges:

<input type=TEXT name='zip_estimate' size=6 maxlength=6>
{*{include file="main/states.tpl" states=$states name="s_state" default=$userinfo.s_state default_country=$userinfo.s_country}*}
<input type=image alt="Calculate Shipping" src="{$ImagesDir}/go.gif" border=0 align=absmiddle name=btnCalculate>

   {else} 

Click here to change your zip code: {$userinfo.s_zipcode}

  {/if} 
{/if} 

{* END Shipping Estimate *}

Note the original commented code that will need to be replaced as well:

{*{if $not_logged_message eq "1"}{$lng.txt_order_total_msg}{/if}*}

Anyhow, I figured I would contribute this extension to an already much needed mod X-Cart should have by default if you ask me