msProducts snippet events

Events for integrating third-party packages (ms3Variants, msBrands, etc.) into the msProducts snippet without modifying MiniShop3 core code.

usePackages parameter

To enable a package's data loading, pass its name in the snippet parameter:

{'msProducts' | snippet : [
    'parents' => 0,
    'usePackages' => 'ms3Variants,msBrands'
]}

Plugins check for their package in this parameter and load data only when needed.

msOnProductsLoad

Fired after the product list is loaded from the database, before processing. Intended for bulk loading of extra data in a single query — avoids N+1.

Parameters

Parameter	Type	Description
rows	array (reference)	Product rows, can be modified
productIds	array	Array of product IDs [1, 2, 3, ...]
usePackages	array	Requested packages ['ms3Variants', 'msBrands']
scriptProperties	array	All snippet call parameters

Basic example

<?php
switch ($modx->event->name) {
    case 'msOnProductsLoad':
        // Check if our package was requested
        $usePackages = $scriptProperties['usePackages'] ?? [];
        if (!in_array('myPackage', $usePackages)) {
            return;
        }

        // Load data for ALL products in one query
        $productIds = $scriptProperties['productIds'];

        // Your data loading logic
        $myData = loadDataForProducts($productIds);

        // Store in eventData for use in msOnProductPrepare
        $modx->eventData['myPackage'] = [
            'dataMap' => $myData,
        ];
        break;
}

Example: loading product variants (ms3Variants)

<?php
switch ($modx->event->name) {
    case 'msOnProductsLoad':
        // Check if our package was requested
        $usePackages = $scriptProperties['usePackages'] ?? [];
        if (!in_array('ms3Variants', $usePackages)) {
            return;
        }

        // Check if package is installed
        if (!$modx->services->has('ms3variants')) {
            return;
        }

        // Load variants for ALL products in one query
        $productIds = $scriptProperties['productIds'];
        $variantService = $modx->services->get('ms3variants_variant_service');

        // Store in eventData for msOnProductPrepare
        $modx->eventData['ms3variants'] = [
            'variantsMap' => $variantService->getVariantsForProducts($productIds, ['active' => true]),
        ];
        break;
}

---

msOnProductPrepare

Fired when preparing each product for output. Used to attach data loaded in msOnProductsLoad to the current product.

Parameters

Parameter	Type	Description
row	array (reference)	Product data, can be modified
productId	int	Product ID
idx	int	Index of the product in the result set

Basic example

<?php
switch ($modx->event->name) {
    case 'msOnProductPrepare':
        // No data — package was not requested or not installed
        $myData = $modx->eventData['myPackage']['dataMap'] ?? null;
        if ($myData === null) {
            return;
        }

        $productId = $scriptProperties['productId'];
        $row = &$scriptProperties['row'];

        // Attach data to product
        if (isset($myData[$productId])) {
            $row['my_field'] = $myData[$productId];
        }
        break;
}

Example: attaching variants (ms3Variants)

<?php
switch ($modx->event->name) {
    case 'msOnProductPrepare':
        // No data — package was not requested
        $variantsMap = $modx->eventData['ms3variants']['variantsMap'] ?? null;
        if ($variantsMap === null) {
            return;
        }

        $productId = $scriptProperties['productId'];
        $row = &$scriptProperties['row'];

        if (isset($variantsMap[$productId])) {
            $row['variants'] = $variantsMap[$productId];
            $row['variants_count'] = count($variantsMap[$productId]);
            $row['variants_json'] = json_encode($variantsMap[$productId]);
            $row['has_variants'] = true;
        } else {
            $row['variants'] = [];
            $row['variants_count'] = 0;
            $row['variants_json'] = '[]';
            $row['has_variants'] = false;
        }
        break;
}

---

Full integration plugin example

Plugin that adds a "New" badge to products created in the last 7 days.

<?php
/**
 * Plugin: Product badges
 * Events: msOnProductsLoad, msOnProductPrepare
 */

switch ($modx->event->name) {

    case 'msOnProductsLoad':
        // Check parameter
        $usePackages = $scriptProperties['usePackages'] ?? [];
        if (!in_array('msBadges', $usePackages)) {
            return;
        }

        $rows = $scriptProperties['rows'];
        $weekAgo = strtotime('-7 days');

        // Mark products created in the last 7 days
        $newProducts = [];
        foreach ($rows as $row) {
            if (strtotime($row['createdon']) > $weekAgo) {
                $newProducts[$row['id']] = true;
            }
        }

        // Store for msOnProductPrepare
        $modx->eventData['msBadges'] = [
            'newProducts' => $newProducts,
        ];
        break;

    case 'msOnProductPrepare':
        $badgesData = $modx->eventData['msBadges'] ?? null;
        if ($badgesData === null) {
            return;
        }

        $productId = $scriptProperties['productId'];
        $row = &$scriptProperties['row'];

        $badges = [];

        // "New" badge
        if (!empty($badgesData['newProducts'][$productId])) {
            $badges[] = [
                'type' => 'new',
                'label' => 'New',
                'color' => '#28a745',
            ];
        }

        // "Sale" badge (if old_price exists)
        if (!empty($row['old_price']) && $row['old_price'] > $row['price']) {
            $discount = round((($row['old_price'] - $row['price']) / $row['old_price']) * 100);
            $badges[] = [
                'type' => 'sale',
                'label' => "-{$discount}%",
                'color' => '#dc3545',
            ];
        }

        $row['badges'] = $badges;
        $row['badges_json'] = json_encode($badges);
        $row['has_badges'] = !empty($badges);
        break;
}

Using in template

{'msProducts' | snippet : [
    'parents' => 0,
    'usePackages' => 'msBadges',
    'tpl' => 'tpl.msProducts.badges'
]}

Chunk tpl.msProducts.badges:

<div class="product-card">
    {if $has_badges}
        <div class="product-badges">
            {foreach $badges as $badge}
                <span class="badge" style="background: {$badge.color}">
                    {$badge.label}
                </span>
            {/foreach}
        </div>
    {/if}

    <h3>{$pagetitle}</h3>
    <div class="price">{$price} руб.</div>
</div>

---

Passing data between events

Use $modx->eventData to pass data between events:

// In msOnProductsLoad — store
$modx->eventData['myPackage'] = [
    'dataMap' => $loadedData,
    'settings' => $mySettings,
];

// In msOnProductPrepare — read
$dataMap = $modx->eventData['myPackage']['dataMap'] ?? null;
$settings = $modx->eventData['myPackage']['settings'] ?? [];

Data isolation

Use your package name as the key in eventData to avoid conflicts with other plugins.

---

Performance

Events are designed for optimal performance:

1. msOnProductsLoad — runs once to load data for all products
2. msOnProductPrepare — runs per product but only attaches already-loaded data

This avoids the N+1 query problem:

❌ Without bulk loading: 1 query for list + N queries for variants = O(N+1)
✅ With bulk loading:     1 query for list + 1 query for all variants = O(2)