Display a checkbox that add a fee in Woocommerce checkout page - php

Question

In Woocommerce checkout page, I'am trying to add a check box on checkout page
I have referred to these articles
woocommerce custom checkout field to add fee to order ajax
Checkbox field that add / remove a custom fee in WooCommerce
Add a checkout checkbox field that enable a percentage fee in Woocommerce
add_action( 'woocommerce_review_order_before_order_total', 'checkout_shipping_form_packing_addition', 20 );
function checkout_shipping_form_packing_addition( ){
echo '<tr class="packing-select"><th>';
woocommerce_form_field( 'add_gift_box', array(
'type' => 'checkbox',
'class' => array('add_gift_box form-row-wide'),
'label' => __('Hỗ trợ cài đặt'),
'placeholder' => __(''),
));
echo '</th><td>';}
add_action( 'wp_footer', 'woocommerce_add_gift_box' );
function woocommerce_add_gift_box() {
if (is_checkout()) {
?>
<script type="text/javascript">
jQuery( document ).ready(function( $ ) {
$('#add_gift_box').click(function(){
jQuery('body').trigger('update_checkout');
});
});
</script>
<?php
}}
add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee' );
function woo_add_cart_fee( $cart ){
if ( ! $_POST || ( is_admin() && ! is_ajax() ) ) {
return;
}
if ( isset( $_POST['post_data'] ) ) {
parse_str( $_POST['post_data'], $post_data );
} else {
$post_data = $_POST; // fallback for final checkout (non-ajax)
}
if (isset($post_data['add_gift_box'])) {
$sl = WC()->cart->get_cart_contents_count();
$extracost = 50000 * $sl; // not sure why you used intval($_POST['state']) ?
WC()->cart->add_fee( 'Hỗ trợ cài đặt x '.$sl.'', $extracost );
}}
add_filter( 'woocommerce_form_field' , 'remove_order_comments_optional_fields_label', 10, 4 );
function remove_order_comments_optional_fields_label( $field, $key, $args, $value ) {
// Only on checkout page for Order notes field
if( 'add_gift_box' === $key && is_checkout() ) {
$optional = ' <span class="optional">(' . esc_html__( 'optional', 'woocommerce' ) . ')</span>';
$field = str_replace( $optional, '', $field );
}
return $field;
}
It does not work as I would like. What I am doing wrong?
Any help is appreciated.

Answer 1

You really need to use Wordpress Ajax with WC_sessions to make it work like in "Add a checkout checkbox field that enable a percentage fee in Woocommerce" answer thread.
Here is your revisited code:
// Display the custom checkbow field in checkout
add_action( 'woocommerce_review_order_before_order_total', 'fee_installment_checkbox_field', 20 );
function fee_installment_checkbox_field(){
echo '<tr class="packing-select"><th>';
woocommerce_form_field( 'installment_fee', array(
'type' => 'checkbox',
'class' => array('installment-fee form-row-wide'),
'label' => __('Support installation'),
'placeholder' => __(''),
), WC()->session->get('installment_fee') ? '1' : '' );
echo '</th><td>';
}
// jQuery - Ajax script
add_action( 'wp_footer', 'checkout_fee_script' );
function checkout_fee_script() {
// Only on Checkout
if( is_checkout() && ! is_wc_endpoint_url() ) :
if( WC()->session->__isset('installment_fee') )
WC()->session->__unset('installment_fee')
?>
<script type="text/javascript">
jQuery( function($){
if (typeof wc_checkout_params === 'undefined')
return false;
$('form.checkout').on('change', 'input[name=installment_fee]', function(){
var fee = $(this).prop('checked') === true ? '1' : '';
$.ajax({
type: 'POST',
url: wc_checkout_params.ajax_url,
data: {
'action': 'installment_fee',
'installment_fee': fee,
},
success: function (result) {
$('body').trigger('update_checkout');
},
});
});
});
</script>
<?php
endif;
}
// Get Ajax request and saving to WC session
add_action( 'wp_ajax_installment_fee', 'get_installment_fee' );
add_action( 'wp_ajax_nopriv_installment_fee', 'get_installment_fee' );
function get_installment_fee() {
if ( isset($_POST['installment_fee']) ) {
WC()->session->set('installment_fee', ($_POST['installment_fee'] ? true : false) );
}
die();
}
// Add a custom calculated fee conditionally
add_action( 'woocommerce_cart_calculate_fees', 'set_installment_fee' );
function set_installment_fee( $cart ){
if ( is_admin() && ! defined('DOING_AJAX') || ! is_checkout() )
return;
if ( did_action('woocommerce_cart_calculate_fees') >= 2 )
return;
if ( 1 == WC()->session->get('installment_fee') ) {
$items_count = WC()->cart->get_cart_contents_count();
$fee_label = sprintf( __( "Support installation %s %s" ), '×', $items_count );
$fee_amount = 50000 * $items_count;
WC()->cart->add_fee( $fee_label, $fee_amount );
}
}
add_filter( 'woocommerce_form_field' , 'remove_optional_txt_from_installment_checkbox', 10, 4 );
function remove_optional_txt_from_installment_checkbox( $field, $key, $args, $value ) {
// Only on checkout page for Order notes field
if( 'installment_fee' === $key && is_checkout() ) {
$optional = ' <span class="optional">(' . esc_html__( 'optional', 'woocommerce' ) . ')</span>';
$field = str_replace( $optional, '', $field );
}
return $field;
}
Code goes in functions.php file of your active child theme (or active theme). Tested and works on Woocommerce version 3.6.5 with Storefront theme.