Add a custom form fields to the Magento 2 checkout. The form will appear in the first checkout step (shipping step) above shipping methods. The form is available for logged in customers and guests. After an order is placed all data are set in sales_order table. Data are still in the form after page refreshed, till cart is active.

Form data will be set in a quota table through independent API request:

• /V1/carts/mine/set-order-custom-fields (for logged in customer)
• /V1/guest-carts/:cartId/set-order-custom-field (for guest)

• Tag 1.2.* => Magento 2.3
• Tag 1.1.* => Magento 2.1.x - 2.2.x (no longer supported)

• PHP 7.0 or higher

1. Run composer require sbodak/magento2-checkout-custom-form
2. Run php bin/magento module:enable Bodak_CheckoutCustomForm
3. Run php bin/magento setup:upgrade

• buyer
• buyer email address
• purchase order no.
• goods mark
• comments

• You need to modify service contract data interface in Api/Data/CustomFieldsInterfaces.php
• You need to modify table schema in Setup/InstallData.php
• You need to add new fields to observer Observer/AddCustomFieldsToOrder.php which save data in quota and sales table
• You need to add new item in view/frontend/layout/checkout_index_index.xml
• You need to modify the methods in Model/Data/CustomFields.php
• You need to modify the methods in Model/CustomFieldsRepository.php

<item name="custom-checkout-form-fieldset" xsi:type="array">
    <item name="component" xsi:type="string">uiComponent</item>
    <item name="displayArea" xsi:type="string">custom-checkout-form-fields</item>
    <item name="children" xsi:type="array">
        [... place here new definition of your field]
    </item>
</item>

Check official documentation: https://devdocs.magento.com/guides/v2.3/howdoi/checkout/checkout_form.html

• You need to modify template views in view/frontend/templates/order/view/custom_fields.phtml (for customer account) and view/adminhtml/templates/order/view/custom_fields.phtml (for admin panel).
• Checkout form view is generated automatically using Ui Components

If you want to make field required, check this example:

<item name="checkout_purchase_order_no" xsi:type="array">
    <item name="component" xsi:type="string">Magento_Ui/js/form/element/abstract</item>
    <item name="config" xsi:type="array">
        <item name="customScope" xsi:type="string">customCheckoutForm</item>
        <item name="template" xsi:type="string">ui/form/field</item>
        <item name="elementTmpl" xsi:type="string">ui/form/element/input</item>
    </item>
    <item name="validation" xsi:type="array">
        <item name="required-entry" xsi:type="boolean">true</item>
    </item>
    <item name="provider" xsi:type="string">checkoutProvider</item>
    <item name="dataScope" xsi:type="string">customCheckoutForm.checkout_purchase_order_no</item>
    <item name="label" xsi:type="string">Purchase order no.</item>
    <item name="sortOrder" xsi:type="string">3</item>
</item>

You can modify i18n/en_US.csv translation to change field names.

To remove this module run php bin/magento module:uninstall Bodak_CheckoutCustomForm. It will remove all data and drop columns in sales_order and quote tables.

MIT License