Product custom checkbox option that changes Woocommerce cart item price - php

Question

The following code displays a custom checkbox before add to cart button on single product pages:
add_action( 'woocommerce_before_add_to_cart_button', 'output_custom_text_field', 0 );
function output_custom_text_field() {
//Lots of code then:
<input type="checkbox" id="option1" name="option1">
}
Now I would like to trap/capture this checkbox option in Woocommerce session and then make a custom price calculations in the following code:
function final_cart_update( $cart_object ) {
foreach ( $cart_object->get_cart() as $cart_item ) {
// get the custom pricing for this product
if (isset( $_POST['option1'])) {
$pricing_custom = get_post_meta( $cart_item['product_id'], '_number_field_1', true );
}
// get product price
$price = floatval( $cart_item['data']->get_price() );
// set new price
$cart_item['data']->set_price( $price + $pricing_custom );
}
}
add_action( 'woocommerce_before_calculate_totals', 'final_cart_update', 99, 1 );
What is missing is the part that will capture the checkbox option to set it in sessions, like:
if (isset( $_POST['option1'])) {
// Set it in session
}
Any help is appreciated.
Admin Part of the code →
/*-------------------------------------------*/
/* 5. Adding Custom Field */
/*-------------------------------------------*/
// Add custom fields in "product data" settings metabox ("Advanced" tab)
add_action('woocommerce_product_options_advanced','woocious_add_custom_field_product_dashboard');
function woocious_add_custom_field_product_dashboard(){
global $post;
echo '<div class="product_custom_field">';
// Checkbox Field
woocommerce_wp_checkbox( array(
'id' => 'woocious_custom_services_fields',
'description' => __('Select if you want add on services', 'woocious'),
'label' => __('Display custom add on services', 'woocious'),
'desc_tip' => 'true',
) );
// Minimum Letter Text Box
woocommerce_wp_text_input( array(
'id' => 'addon_service_1',
'label' => __('Service 1', 'woocommerce'),
'description' => __('set custom minimum Lettering text field', 'woocommerce'),
'desc_tip' => 'true',
) );
// Number Field
woocommerce_wp_text_input(
array(
'id' => '_number_field_1',
'label' => __( 'Service amount 1', 'woocommerce' ),
'placeholder' => '',
'desc_tip' => false,
'description' => __( "Please enter the service amount", 'woocommerce' ),
'type' => 'number',
'desc_tip' => 'true',
'custom_attributes' => array(
'step' => 'any',
'min' => '0'
)
)
);
// Maximum Letter Text Box
woocommerce_wp_text_input( array(
'id' => 'addon_service_2',
'label' => __('Service 2', 'woocommerce'),
'description' => __('set custom maximum Lettering text field', 'woocommerce'),
'desc_tip' => 'true'
) );
// Number Field
woocommerce_wp_text_input(
array(
'id' => '_number_field_2',
'label' => __( 'Service amount 2', 'woocommerce' ),
'placeholder' => '',
'desc_tip' => false,
'description' => __( "Please enter the service amount", 'woocommerce' ),
'type' => 'number',
'desc_tip' => 'true',
'custom_attributes' => array(
'step' => 'any',
'min' => '0'
)
)
);
echo '</div>';
}
// Save Inputted Entries, in the Product Dashboard Text Fields.
add_action('woocommerce_process_product_meta', 'woocommerce_product_custom_fields_save');
function woocommerce_product_custom_fields_save($post_id){
// Checkbox Field
$checkbox = isset( $_POST['woocious_custom_services_fields'] ) ? 'yes' : 'no';
update_post_meta( $post_id, 'woocious_custom_services_fields', $checkbox );
// Save Minimum Letters
if ( isset( $_POST['addon_service_1'] ) )
update_post_meta($post_id, 'addon_service_1', sanitize_text_field( $_POST['addon_service_1'] ) );
// Save Maximum Letters
if ( isset( $_POST['addon_service_2'] ) )
update_post_meta($post_id, 'addon_service_2', sanitize_text_field( $_POST['addon_service_2'] ) );
// Save the services amount
if ( isset( $_POST['_number_field_1'] ) )
update_post_meta($post_id, '_number_field_1', sanitize_text_field( $_POST['_number_field_1'] ) );
}
Outputting HTML on Product Page →
// Output Custom Text Field to Product Page
add_action( 'woocommerce_before_add_to_cart_button', 'output_custom_text_field', 0 );
function output_custom_text_field() {
// Get the checkbox value
$custom_option = get_post_meta( $post->ID, 'woocious_custom_services_fields', true );
// If is single product page and have the "custom text option" enabled we display the field
if ( is_product() && ! empty($custom_option) ) {
?>
<div class="woociousbuy_inner">
<div class="woociousbuy_two">
<h3>Add on Services</h3>
<input type="checkbox" id="option1" name="option1">
<label for="option1"><?php global $post; echo get_post_meta($post->ID,'addon_service_1',true);?>
<svg class="svgcheckbox" width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><path d="M13 50.986L37.334 75 88 25" stroke-width="15" stroke="#66bb6a" fill="none" fill-rule="evenodd" stroke-dasharray="150" stroke-dashoffset="150"/></svg>
</label><span class="woocense_price bold">€<?php global $post; echo get_post_meta($post->ID,'_number_field_1',true);?></span>
</div>
<div class="woociousbuy_inner">
<input type="checkbox" id="option2" name="option2"/>
<label for="option2"><?php global $post; echo get_post_meta($post->ID,'addon_service_2',true);?>
<svg class="svgcheckbox" width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><path d="M13 50.986L37.334 75 88 25" stroke-width="15" stroke="#66bb6a" fill="none" fill-rule="evenodd" stroke-dasharray="150" stroke-dashoffset="150"/></svg>
</label><span class="woocense_price bold">€<?php global $post; echo get_post_meta($post->ID,'_number_field_2',true);?></span>
</div>
</div>
<?php
}
}

Answer 1

You don't need to use any session for that. Use woocommerce_add_cart_item_data filter hook like:
add_action( 'woocommerce_before_add_to_cart_button', 'custom_product_option_checkbox_field' );
function custom_product_option_checkbox_field() {
echo '<p><label><input type="checkbox" id="option1" name="option1"> '.__("Option 1").'</label></p>';
}
// Add selected add-on option as custom cart item data
add_filter( 'woocommerce_add_cart_item_data', 'filter_add_cart_item_data_callback', 10, 3 );
function filter_add_cart_item_data_callback( $cart_item_data, $product_id, $variation_id ) {
if ( isset( $_POST['option1'] ) && $pricing_custom = get_post_meta( $product_id, '_number_field_1', true ) ) {
$cart_item_data['pricing_custom'] = $pricing_custom;
$cart_item_data['unique_key'] = md5( microtime().rand() ); // Make each item unique
}
return $cart_item_data;
}
// Change the product price
add_action( 'woocommerce_before_calculate_totals', 'action_before_calculate_totals_callback', 10, 1 );
function action_before_calculate_totals_callback( $cart ) {
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
// Avoiding hook repetition and price calculation problems
if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
return;
// Loop through cart items
foreach ( $cart->get_cart() as $cart_item ) {
if ( isset( $cart_item['pricing_custom'] ) ) {
// Set the calculated price
$cart_item['data']->set_price( $cart_item['data']->get_price() + $cart_item['pricing_custom'] );
}
}
}
Code goes in functions.php file of your active child theme (or active theme). Tested and works.