How to Add Custom Checkout Field in the Address Block
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2. Save Custom Field Data (Frontend to Backend)
To send the custom field’s data to the WooCommerce backend during form submission, you can use the woocommerce_store_api_checkout filter in WooCommerce Blocks.
JavaScript: Handling Field Value Submission
To send the custom field data, use onChange or onBlur to capture the field value and include it in the checkout form submission request. You can do this by modifying the form submission payload.
const handleFieldChange = ( event ) => {
const fieldValue = event.target.value;
// Save field data in the local state or send it as part of the request
// Pass it along with other checkout data when submitting.
wcBlocksCheckout.setCheckoutField('custom_field', fieldValue);
};
This function saves the custom field data in the form and passes it along with the regular checkout fields when submitting.
