Php WooCommerce结帐-更新运输成本

我正在使用Sendy API根据从Google location API管理的下拉列表中选择的位置来计算结帐页面中的运费。 除了我的运费没有计算在内，其他一切都很好。我不确定如何通过配送，因为每次选择位置时我都会得到0值。在谷歌搜索之后，我想出了这个代码分解。有人，请帮助我如何做到这一点

AJAX从API中提取运输成本

function sendy_api_script() 
{
?>
<?php if(is_checkout()){ ?>
<script type="text/javascript">
jQuery( document ).ready(function( $ ) {
    $('#sendy_location').niceSelect('destroy');

    $(document).on('change','#sendy_location',function(){
        shipping_location_selected = $(this).val();
        cart_total = $('.cart-subtotal .woocommerce-Price-amount').text().replace("KShs","");
         $.post(ajaxurl,{
             "action": 'update_shipping_cost',
             "sendy_location":shipping_location_selected,
             "cart_total":cart_total,
         },function(){
             $('body').trigger('update_checkout');
         });
    });

    var input = document.getElementById('sendy_location');
    google.maps.event.addDomListener(window, 'load', input); 

    var options = {
        types: ['geocode'],
        componentRestrictions: {country: "ke"}
    };

    var autocomplete = new google.maps.places.Autocomplete(input, options);

    google.maps.event.addListener(autocomplete, 'place_changed', function() {
        var place = autocomplete.getPlace();
        document.getElementById('city2').value = place.name;
        document.getElementById('cityLat').value = place.geometry.location.lat();
        document.getElementById('cityLng').value = place.geometry.location.lng();

        //sendy api call
        var name = $('#billing_first_name').val()+' '+$('#billing_last_name').val();
        var phone = $('#billing_phone').val();
        var email = $('#billing_email').val();
        var customerLocation = $('#city2').val();
        var cityLat = $('#cityLat').val();
        var cityLng = $('#cityLng').val();
        var amountTotal = $('#amounttotal').val();
        var pickupdate = $('#pickupdate').val();
        var requestToken = $('#randomvalue').val();

        /* distance calculation between customer pickup point and Kericho Gold dispatch location */
        var dispatchNairobi = 'Nairobi, Kenya';
        var dispatchMombasa = 'Mombasa, Kenya';

        // var source = 'Nairobi, Kenya';
        var destination = customerLocation;

        var service = new google.maps.DistanceMatrixService();
        service.getDistanceMatrix({
            origins: [dispatchNairobi],
            destinations: [destination],
            travelMode: google.maps.TravelMode.DRIVING,
            unitSystem: google.maps.UnitSystem.METRIC,
            avoidHighways: false,
            avoidTolls: false
        }, function (response, status) {
            if (status == google.maps.DistanceMatrixStatus.OK && response.rows[0].elements[0].status != "ZERO_RESULTS") {
                var distanceNairobi = response.rows[0].elements[0].distance.value;
                var durationNairobi = response.rows[0].elements[0].duration.text;

                $("#nairobiDistance").val(distanceNairobi).change();

            } else {
                alert("An error occured.");
            }
        });

        service.getDistanceMatrix({
            origins: [dispatchMombasa],
            destinations: [destination],
            travelMode: google.maps.TravelMode.DRIVING,
            unitSystem: google.maps.UnitSystem.METRIC,
            avoidHighways: false,
            avoidTolls: false
        }, function (response, status) {
            if (status == google.maps.DistanceMatrixStatus.OK && response.rows[0].elements[0].status != "ZERO_RESULTS") {
                var distanceMombasa = response.rows[0].elements[0].distance.value;
                var durationMombasa = response.rows[0].elements[0].duration.text;

                $("#mombasaDistance").val(distanceMombasa).change();

            } else {
                alert("An error occured.");
            }
        });             

        /* end */
        jQuery('input#mombasaDistance').on( 'change', function(){
            if( $("#mombasaDistance").val() < $("#nairobiDistance").val() )
            {
                var dispatchLocation = dispatchMombasa;
                var dispatchLat = '-4.0350145';
                var dispatchLong = '39.5962225';    

                console.log(dispatchLocation);
            }
            else if($("#nairobiDistance").val() < $("#mombasaDistance").val())
            {
                var dispatchLocation = dispatchNairobi;
                var dispatchLat = '-1.3028618';
                var dispatchLong = '36.7073099';

                console.log(dispatchLocation);
            }

            $.ajax({

           data:{
"action": 'sendyapicall',
"security": "wc_checkout_params.update_order_review_nonce",
"command": "request",
"data": {
    "api_key": "API-Key",
    "api_username": "username",
    "vendor_type": 1,
    "from": {
      "from_name": "dispatchLocation",
      "from_lat": "dispatchLat",
      "from_long": "dispatchLong",
      "from_description": ""
    },
    "to": {
      "to_name": customerLocation,
      "to_lat": cityLat,
      "to_long": cityLng,
      "to_description": ""
    },
    "recepient": {
        "recepient_name": name,
        "recepient_phone": phone,
        "recepient_email": email,
        "recepient_notes": ""
    },
    "delivery_details": {
      "pick_up_date": pickupdate,
      "collect_payment": {
        "status": false,
        "pay_method": 0,
        "amount": amountTotal
      },
                          "return": true,
 "note": " Sample note",
  "note_status": true,
  "request_type": "quote"
}
},
"request_token_id": requestToken
},
changeOrigin: true,
type: 'POST',
url:ajaxurl,
success: function(response){
var responseData = JSON.parse(''+response+'');

if(responseData.success == false)
{
    $("html, body").animate({ scrollTop: 0 }, "slow");
    $('.sendy-errors').html('An error occured. Please refresh the page and try again.');
}
else
{
    console.log('success');

    location.reload();

    console.log(responseData.response.body);
}
},
dataType: 'html',
error: function(response){
$("html, body").animate({ scrollTop: 0 }, "slow");
$('.sendy-errors').html('An error occured. Please refresh the page and 
try again.');
}
});




        });
    });
});
</script>

这里是我失去一切的地方。我想传递我在上面代码中存储的运费，每当选择一个位置时，API就会调用运费并显示在签出页面中。请参阅代码

//make api call to update Shipping cost

function update_shipping_cost() 
{
if ( empty( $_POST['sendy_location']) ) 
{
    wp_die( 'You have to select from the location dropdown' );
}

$shipping_location = $_POST['sendy_location'];
$cart_total = str_replace(",","",$_POST['cart_total']);
$cart_total = floatval($cart_total);


if (empty($shipping_location) ) 
{
    echo json_encode(array( 'success' => false, 'response' => $response->get_error_message() ));
    exit;
}
else 
{
    //this is where I want to call the shipping cost. currently it's displaying zero
    {
        session_start();
        $_SESSION['shippingCost'] = $shippingCost;
        echo json_encode(array( 'success' => true, 'response' => $response ));


}

wp_die();
}

/* end */

此函数获取API返回的运费，然后将其传递给函数

/* shipping cost from sendy */

function woo_sendy_shipping_cost() 
{
@session_start();
$shippingCost = $_SESSION['shippingCost'];
WC()->cart->add_fee('Shipping ', $shippingCost);
}

有人请帮助我如何在上述功能中调用shipping以使其工作。？提前谢谢

/* shipping cost from sendy */

function woo_sendy_shipping_cost() 
{
@session_start();
$shippingCost = $_SESSION['shippingCost'];
WC()->cart->add_fee('Shipping ', $shippingCost);
}