Delivery charge collected on the Cart page

gistfile1.html

<script>

Shopify.Cart = Shopify.Cart || {};

Shopify.Cart.DeliveryCharge = {};

Shopify.Cart.DeliveryCharge.set = function(data) {
  jQuery.ajax({
    type: 'POST',
    url: '/cart/update.js', 
    data: data, 
    dataType: 'json',
    success: function() { location.href = '/cart'; }
  });
};

Shopify.Cart.DeliveryCharge.product = {{ linklists.delivery-charge.links.first.object | to_json }};

$('#select-first-two-digits-of-your-postal-code-delivery-charge').change(function() {
  var data = {};
  switch( $(this).find('option:selected').index() ) {
    case 0:
      Shopify.Cart.DeliveryCharge.set( { 
        updates: {
          Shopify.Cart.DeliveryCharge.product.variants[0].id: 1,
          Shopify.Cart.DeliveryCharge.product.variants[1].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[2].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[3].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[4].id: 0            
        }, attributes: { 
          select-first-two-digits-of-your-postal-code-delivery-charge: '01-$5.00'
        } 
      } );
      break;
    case 1:
      Shopify.Cart.DeliveryCharge.set( { 
        updates: {
          Shopify.Cart.DeliveryCharge.product.variants[0].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[1].id: 1,
          Shopify.Cart.DeliveryCharge.product.variants[2].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[3].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[4].id: 0            
        }, attributes: { 
          select-first-two-digits-of-your-postal-code-delivery-charge: '02-$8.00'
        } 
      } );
      break;
    case 2:
      Shopify.Cart.DeliveryCharge.set( { 
        updates: { 
          Shopify.Cart.DeliveryCharge.product.variants[0].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[1].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[2].id: 1,
          Shopify.Cart.DeliveryCharge.product.variants[3].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[4].id: 0            
        }, attributes: {
          select-first-two-digits-of-your-postal-code-delivery-charge: '03-$10.00'
        } 
      } );
      break;
    case 3:
      Shopify.Cart.DeliveryCharge.set( { 
        updates: {
          Shopify.Cart.DeliveryCharge.product.variants[0].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[1].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[2].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[3].id: 1,
          Shopify.Cart.DeliveryCharge.product.variants[4].id: 0            
        }, attributes: { 
          select-first-two-digits-of-your-postal-code-delivery-charge: '30-39 $5.00'
        } 
        } );
      break;
    case 4:
      Shopify.Cart.DeliveryCharge.set( { 
        updates: { 
          Shopify.Cart.DeliveryCharge.product.variants[0].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[1].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[2].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[3].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[4].id: 1            
        }, attributes: { 
          select-first-two-digits-of-your-postal-code-delivery-charge: '41-49 $3.00'
        } 
      } );
      break;
    default:
      Shopify.Cart.DeliveryCharge.set( { 
        updates: { 
          Shopify.Cart.DeliveryCharge.product.variants[0].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[1].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[2].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[3].id: 0,
          Shopify.Cart.DeliveryCharge.product.variants[4].id: 0            
        }, attributes: { 
          select-first-two-digits-of-your-postal-code-delivery-charge: ''
        } 
      } );
  }
});
</script>