Checkout

Last purchase step: contacts, delivery, payment, address. The package ships a page template and form chunk.

Page structure

Component	File	Chunk name in DB	Purpose
Page template	elements/templates/order.tpl	—	Page layout, msOrder call
Form chunk	elements/chunks/ms3_order.tpl	tpl.msOrder	Checkout form

Snippet call

{'!msOrder' | snippet : [
    'tpl' => 'tpl.msOrder'
]}

Caching

The msOrder snippet must be called uncached (!msOrder) because it works with the user session.

Order form

The form contains the following sections:

Section	Description
Empty cart	Message and link to the catalog (if the cart is empty)
Contact details	First name, last name, email, phone, comment
Payment methods	Radio buttons with logo and description
Delivery methods	Radio buttons with logo and description
Delivery address	Postal code, region, city, street, building, entrance, floor, apartment
Saved addresses	Dropdown of previously saved addresses (for logged-in customers)
Summary panel	Product cost, delivery cost, total, cancel and submit buttons

Placeholders

The form chunk exposes the following data:

Placeholder	Type	Description
$isCartEmpty	bool	Cart is empty
$form	array	Form field values ($form.first_name, $form.email, etc.)
$order	array	Order data ($order.cost, $order.delivery_cost, $order.cart_cost)
$deliveries	array	Delivery methods
$payments	array	Payment methods
$addresses	array	Customer saved addresses
$isCustomerAuth	bool	Customer is logged in

Delivery and payment linkage

Each delivery includes a payments array with IDs of allowed payment methods. On delivery change, JS hides incompatible payments. Links are set in the Manager on the delivery card (msDeliveryMember).

If the pair is invalid, submit or Manager finalize returns an error.

Guest and authenticated customer

Mode	What happens
Guest	Fills contacts manually. No saved addresses
Authenticated	Form shows an address list. Contacts can come from the profile

Auto-registration on checkout

Keys:

• ms3_customer_auto_register_on_order (on by default)
• ms3_customer_auto_login_on_order (on by default)

On submit, a guest with a valid email can get an msCustomer row and session without a separate registration. Turn the keys off if accounts are created only via the account form.

Separately: ms3_order_register_user_on_submit creates a modUser on checkout (off by default). That is not the same as msCustomer.

Manual login and registration: Login and registration.

Validation

How field validation works

Required fields and rules are set per delivery method in the Manager. Courier needs an address; pickup often needs only phone and email.

Rule setup: Deliveries → Validation.

Validation process

1. On delivery change OrderUI calls GET /api/v1/order/delivery/validation-rules and GET /api/v1/order/delivery/required-fields, hides extra fields, and updates required.
2. On ms3.order.setField the server checks the field against the current delivery rules.
3. On submit the server checks all required fields.
4. On error JS adds is-invalid and text in .invalid-feedback.

Saved addresses

The msOrder snippet loads order-addresses.js (not part of ms3_frontend_assets). In the chunk — <select id="saved_address_id"> with <option data-address='{"city":"..."}'>: selecting an option fills the form fields automatically.

Two API paths:

Scenario	Endpoint
Checkout: apply address to draft	POST /api/v1/order/address/set
Pick address from list (AuthUI / msCustomer)	POST /api/v1/customer/changeAddress

Clear address fields: POST /api/v1/order/address/clean.

Custom fields (_validated)

Fields outside the order model (for example a consent checkbox agreement) go into the draft and are stored in msOrder.properties['_validated']. On order-create events they are available as customFields.

On the storefront the checkbox must send input.checked (1 / 0), not a static value. For consent use the accepted rule on the delivery.

JavaScript API

ms3.order object

// Submit order
ms3.order.submit();

// Update delivery method
ms3.order.setDelivery(deliveryId);

// Update payment method
ms3.order.setPayment(paymentId);

// Update form field
ms3.order.setField('city', 'Moscow');

Events

// Before order submission
document.addEventListener('ms3:order:before-submit', (e) => {
    console.log('Order data:', e.detail);
    // Cancel submission: e.preventDefault()
});

// After successful checkout
document.addEventListener('ms3:order:success', (e) => {
    console.log('Order created:', e.detail.order_id);
    window.location.href = e.detail.redirect;
});

// On checkout error
document.addEventListener('ms3:order:error', (e) => {
    console.error('Errors:', e.detail.errors);
});

// On delivery method change
document.addEventListener('ms3:order:delivery-changed', (e) => {
    console.log('Delivery selected:', e.detail.delivery_id);
});

// On payment method change
document.addEventListener('ms3:order:payment-changed', (e) => {
    console.log('Payment selected:', e.detail.payment_id);
});

Server events

Order field events

Event	When	Parameters
msOnBeforeAddToOrder	Before adding a field	key, value, draft
msOnAddToOrder	After adding a field	key, value, draft
msOnBeforeRemoveFromOrder	Before removing a field	key, draft
msOnRemoveFromOrder	After removing a field	key, draft

Validation events

Event	When	Parameters
msOnBeforeValidateOrderValue	Before value validation	key, value, orderData
msOnValidateOrderValue	Validation passed	key, value
msOnErrorValidateOrderValue	Validation error	key, value, error

Checkout events

Event	When	Parameters
msOnSubmitOrder	Before checkout starts	handler, draft, orderData, data
msOnBeforeCreateOrder	Before order creation	handler, msOrder
msOnCreateOrder	After order creation	handler, msOrder

Customization

Changing the order form

1. Create your own chunk, e.g. tpl.myOrder
2. Specify it in the call: 'tpl' => 'tpl.myOrder'
3. Use the available placeholders from the msOrder documentation

Adding custom fields

Fields outside the order model take two steps.

1. Validation. Add rules in delivery settings:

{
  "first_name": "required",
  "email": "required|email",
  "agree": "accepted"
}

2. Saving. Standard fields (first_name, email, city, etc.) write themselves. Put foreign keys (not from msOrder / msOrderAddress) into order properties with a plugin if you need them after checkout:

switch ($modx->event->name) {
    case 'msOnBeforeCreateOrder':
        // $msOrder is available from event parameters
        $address = $msOrder->Address;
        if ($address) {
            $properties = $msOrder->get('properties') ?: [];
            $properties['agree'] = $address->get('properties')['agree'] ?? '';
            $msOrder->set('properties', $properties);
        }
        break;
}

Подсказка

An “I agree to the terms” checkbox often needs validation only. Then the accepted rule on the delivery is enough. You do not have to write it into the order.

Responsive layout

The form uses Bootstrap 5 Grid:

Screen	Columns
< 992px	One section per row (100%)
≥ 992px	Two sections per row (50% + 50%)