I've been creating an autofill checkout pile of code for WooCommerce so that when I get people from my software to get a link to my site to purchase something. But I've been having trouble getting to work, even with incognito and a URL with dummy data in it. If someone can tell me what I'm doing wrong, or I need to put it somewhere else.
My code:
function custom_autofill_checkout_fields() {
// Only run on checkout page
if (!is_checkout()) {
return;
}
// Get URL parameters
$autofill_fields = array(
'billing_first_name' => isset($_GET['fname']) ? sanitize_text_field($_GET['fname']) : '',
'billing_last_name' => isset($_GET['lname']) ? sanitize_text_field($_GET['lname']) : '',
'billing_email' => isset($_GET['email']) ? sanitize_email($_GET['email']) : '',
'billing_phone' => isset($_GET['phone']) ? sanitize_text_field($_GET['phone']) : '',
'billing_company' => isset($_GET['company']) ? sanitize_text_field($_GET['company']) : '',
'billing_address_1' => isset($_GET['address1']) ? sanitize_text_field($_GET['address1']) : '',
'billing_address_2' => isset($_GET['address2']) ? sanitize_text_field($_GET['address2']) : '',
'billing_city' => isset($_GET['city']) ? sanitize_text_field($_GET['city']) : '',
'billing_state' => isset($_GET['state']) ? sanitize_text_field($_GET['state']) : '',
'billing_postcode' => isset($_GET['postcode']) ? sanitize_text_field($_GET['postcode']) : '',
'billing_country' => isset($_GET['country']) ? sanitize_text_field($_GET['country']) : '',
// Copy billing to shipping if requested
'ship_to_different_address' => isset($_GET['ship_different']) && $_GET['ship_different'] === '1' ? true : false,
// Shipping fields
'shipping_first_name' => isset($_GET['ship_fname']) ? sanitize_text_field($_GET['ship_fname']) : '',
'shipping_last_name' => isset($_GET['ship_lname']) ? sanitize_text_field($_GET['ship_lname']) : '',
'shipping_company' => isset($_GET['ship_company']) ? sanitize_text_field($_GET['ship_company']) : '',
'shipping_address_1' => isset($_GET['ship_address1']) ? sanitize_text_field($_GET['ship_address1']) : '',
'shipping_address_2' => isset($_GET['ship_address2']) ? sanitize_text_field($_GET['ship_address2']) : '',
'shipping_city' => isset($_GET['ship_city']) ? sanitize_text_field($_GET['ship_city']) : '',
'shipping_state' => isset($_GET['ship_state']) ? sanitize_text_field($_GET['ship_state']) : '',
'shipping_postcode' => isset($_GET['ship_postcode']) ? sanitize_text_field($_GET['ship_postcode']) : '',
'shipping_country' => isset($_GET['ship_country']) ? sanitize_text_field($_GET['ship_country']) : '',
// Order notes
'order_comments' => isset($_GET['notes']) ? sanitize_textarea_field($_GET['notes']) : '',
);
// Add products to cart if product_id is provided
if (isset($_GET['product_id'])) {
$product_id = intval($_GET['product_id']);
$quantity = isset($_GET['quantity']) ? intval($_GET['quantity']) : 1;
// Clear cart first if requested
if (isset($_GET['clear_cart']) && $_GET['clear_cart'] === '1') {
WC()->cart->empty_cart();
}
// Add product to cart
if ($product_id > 0) {
WC()->cart->add_to_cart($product_id, $quantity);
}
}
// Set checkout fields
foreach ($autofill_fields as $field => $value) {
if (!empty($value)) {
WC()->customer->set_props(array($field => $value));
}
}
// Add JavaScript to handle form field autofilling
add_action('wp_footer', 'custom_autofill_checkout_javascript');
}
add_action('wp_loaded', 'custom_autofill_checkout_fields');
/**
* Add JavaScript to ensure the checkout form fields are populated
*/
function custom_autofill_checkout_javascript() {
if (!is_checkout()) {
return;
}
?>
<script type="text/javascript">
jQuery(document).ready(function($) {
// Get URL parameters
const urlParams = new URLSearchParams(window.location.search);
// Map URL parameters to checkout fields
const fieldMap = {
'fname': '#billing_first_name',
'lname': '#billing_last_name',
'email': '#billing_email',
'phone': '#billing_phone',
'company': '#billing_company',
'address1': '#billing_address_1',
'address2': '#billing_address_2',
'city': '#billing_city',
'state': '#billing_state',
'postcode': '#billing_postcode',
'country': '#billing_country',
'ship_fname': '#shipping_first_name',
'ship_lname': '#shipping_last_name',
'ship_company': '#shipping_company',
'ship_address1': '#shipping_address_1',
'ship_address2': '#shipping_address_2',
'ship_city': '#shipping_city',
'ship_state': '#shipping_state',
'ship_postcode': '#shipping_postcode',
'ship_country': '#shipping_country',
'notes': '#order_comments'
};
// Fill form fields from URL parameters
Object.entries(fieldMap).forEach(([param, selector]) => {
if (urlParams.has(param)) {
$(selector).val(urlParams.get(param)).trigger('change');
}
});
// Handle shipping to different address
if (urlParams.has('ship_different') && urlParams.get('ship_different') === '1') {
$('#ship-to-different-address-checkbox').prop('checked', true).trigger('change');
}
// Ensure fields update when form refreshes
$(document.body).on('updated_checkout', function() {
// Re-apply values after checkout updates
Object.entries(fieldMap).forEach(([param, selector]) => {
if (urlParams.has(param)) {
$(selector).val(urlParams.get(param)).trigger('change');
}
});
});
});
</script>
<?php
}
/**
* Helper function to generate an autofill checkout URL
*
* @param array $customer_data Customer data to pre-fill
* @param int|array $product_id Product ID or array of product IDs and quantities to add to cart
* @param bool $clear_cart Whether to clear the cart before adding products
* @return string The checkout URL with pre-fill parameters
*/
function generate_autofill_checkout_url($customer_data, $product_id = null, $clear_cart = true) {
$checkout_url = wc_get_checkout_url();
$params = array();
// Add customer data parameters
foreach ($customer_data as $key => $value) {
$params[$key] = urlencode($value);
}
// Add product parameters if provided
if ($product_id !== null) {
$params['product_id'] = $product_id;
$params['clear_cart'] = $clear_cart ? '1' : '0';
}
// Build URL with query string
$checkout_url = add_query_arg($params, $checkout_url);
return $checkout_url;
}
custom_prefill_checkout_fields()function exactly? And you said that you're having problems "getting it to work", what problems exactly?