通过WooCommerce中的Google API计算运费购物车费用

Question

所以，在得到SO和互联网的帮助后，我写了一段代码。我想通过billing_city计算供应商位置（Google Maps API Distance-Matrix）与客户区域之间的距离，为购物车添加费用。在这里，我使用结算表后的下拉列表来获取客户区域。

我遇到从cookie中获取值并将变量传递给下一个函数的问题。 FYKI，我已将此代码插入到我的子主题函数中。

add_action( 'wp_footer', 'calculate_distance_between_two_locations' );
function calculate_distance_between_two_locations($dist) {

    // I am getting first item of the cart
    foreach( WC()->cart->get_cart() as $cart_item ){
        $product_id = $cart_item['product_id']; 
        break; 
    }

    //Now I am fetching vendor's id and location of the item
    $vendor_id = get_post_field( 'post_author', $product_id );
    $vendor_location = get_user_meta($vendor_id, 'billing_city', true);

    //Here I'm fetching the value from customer location
    //I am using a dropdown/select named billing_myfield5
    if (is_checkout()) {?>
        <script type="text/javascript">
        jQuery( document ).ready(function( $ ) {
            $('#billing_myfield5').change(function(){
            jQuery('body').trigger('update_checkout');
                var location = $('#billing_myfield5 option:selected').text();
                document.cookie="cusarea="+location;
        });
    });
    </script>
    <?php
    }

    //Encoding the customer's location for Google API 
    //and putting it into a variable 
    $customer_area = rawurlencode($_COOKIE ['cusarea']);

    //I am setting Google API
    $shippingurl = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".$vendor_location."&destinations=".$customer_area."&key=MY_API_KEY";

    //Now fetching json response from googleapis.com:
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $shippingurl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $response = json_decode(curl_exec($ch), true);
    //If google responds with a status of OK
    //Extract the distance text:
    if($response['status'] == "OK"){
        $dist = $response['rows'][0]['elements'][0]['distance']['text'];
    }

    //Getting the integers from the string
    $dist_ance = preg_replace("/[^0-9\.]/", '', $dist);

    //Finally putting the value in session
    session_start();
    $_SESSION['dist'] = $dist_ance;
}

所以，现在我应该在$_SESSION['dist']中有一个值，我应该能够将它传递给同一页面中的另一个函数。这是我用来计算购物车费用的代码。

add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee' );
function woo_add_cart_fee( $cart ){

    if ( ! $_POST || ( is_admin() && ! is_ajax() ) ) {
        return;
    }

    if($_SESSION['dist']){
        $customshipcost = $dist_ance;
        if ( is_admin() && ! defined ( 'DOING_AJAX' ))
            WC()->cart->add_fee('Distance Delivery Charge', $customshipcost , true);
    }
}

嗯，实际上我有两个问题。任何帮助都会非常感激。

• 有时候我会从cookie中获取价值，有时候我不会。我用echo 检查它是否给了我价值。
• 会话没有响应。我的购物车收费为“0”。

FYKI，我现在只想显示数字距离作为购物车中的费用。

Answer 1

以下是在 woocommerce_cart_calculate_fees 操作挂钩中获取所选位置值的正确方法。我已经在这个钩子函数中移动了所有的PHP代码。

在一个隐藏在 woocommerce_after_checkout_form 动作挂钩中的自定义函数中，我添加了您修改过的jQuery代码。

我测试了所有内容（但不是google API部分和距离计算费用）并且它可以正常运行：每次选择一个值时，都会在费用函数中进行更新。

以下是代码：

add_action( 'woocommerce_after_checkout_form', 'custom_checkout_jquery_script', 10 );
function custom_checkout_jquery_script() {
    // Setting the country in customer data and session
    $country_code = 'BD'; // For Bangladesh
    WC()->session->set( 'country', $country_code );
    WC()->session->set( 'billing_country', $country_code );
    WC()->session->set( 'shipping_country', $country_code );
    WC()->customer->set_billing_country( $country_code );
    WC()->customer->set_shipping_country( $country_code );

    // The jQuery code
    ?>
    <script type="text/javascript">
        (function($){
            // Initializing (get the default value)
            var location = $('#billing_myfield5 option:selected').html();
            document.cookie="cusarea="+location;
            // To test the default location output in browser console dev tools
            console.log('Selected Area: '+location);

            // Get the live value when selected
            $( 'form.checkout' ).on( 'change', '#billing_myfield5', function(){
                location = $('#billing_myfield5 option:selected').html();
                document.cookie="cusarea="+location;
                $('body').trigger('update_checkout');
                // To test the selected location output in browser console dev tools
                console.log('Selected Area: '+location);
            });
        })(jQuery);
    </script>
    <?php
}

add_action( 'woocommerce_cart_calculate_fees', 'distance_shipping_fee', 10, 1 );
function distance_shipping_fee( $wc_cart ){

    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;

    if( empty($_COOKIE ['cusarea']) ) return; // Waiting for the selected area (cookie)
    else $cookie = $_COOKIE ['cusarea'];

    // Encoding the customer's location for Google API
    $customer_area = rawurlencode( $cookie );

    // I am getting first item of the cart
    foreach( $wc_cart->get_cart() as $cart_item ){
        $product_id = $cart_item['product_id'];
        break;
    }

    // Get the vendor's id and location
    $vendor_id = get_post_field( 'post_author', $product_id );
    $vendor_location = get_user_meta($vendor_id, 'billing_city', true);

    // Setting Google API URL ##
    $gapi_key = "MY_API_KEY"; // Set HERE your google api key
    $shippingurl = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=$vendor_location";
    $shippingurl .= "&destinations=$customer_area&key=$gapi_key";

    // Now fetching json response from googleapis:
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $shippingurl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $response = json_decode(curl_exec($ch), true);

    // If google responds with a status of OK: Extract the distance text:
    if($response['status'] == "OK")
        $dist = $response['rows'][0]['elements'][0]['distance']['text'];

    // Getting the integers from the string
    $distance = preg_replace("/[^0-9\.]/", '', $dist);

    if( $distance > 0 ){
        $customshipcost = $distance;
        // Displaying the selected location in the fee label
        $wc_cart->add_fee( "Distance Delivery fee ($cookie)", $customshipcost , true);
    }
}

代码放在活动子主题（或主题）的function.php文件中，或者放在任何插件文件中。

所有代码都在Woocommerce 3+上进行测试并且有效。

  

这将解决你的coockie和会话问题