Agent Skills: Controllers Skill

Controllers Skill

This skill guides you through creating storefront controllers for Salesforce B2C Commerce. Controllers handle HTTP requests and render responses for the storefront.

Overview

Controllers are JavaScript modules that handle storefront requests. A controller URL has this structure:

https://{domain}/on/demandware.store/Sites-{SiteName}-Site/{locale}/{ControllerName}-{FunctionName}

Example: https://example.com/on/demandware.store/Sites-RefArch-Site/en_US/Home-Show

Two Controller Patterns

B2C Commerce supports two controller patterns:

| Pattern | When to Use | Module Style | |---------|-------------|--------------| | SFRA | Storefront Reference Architecture sites | server module with middleware | | Classic | Non-SFRA sites, simple APIs | Direct exports with .public = true |

SFRA is recommended for most storefront development. Classic controllers are useful for simple endpoints or non-SFRA projects.

File Location

Controllers reside in the cartridge's controllers directory:

/my-cartridge
    /cartridge
        /controllers
            Home.js           # URL: Home-{function}
            Product.js        # URL: Product-{function}
            Cart.js           # URL: Cart-{function}

Naming: Controller filename becomes the URL prefix. Home.js handles Home-* requests.

SFRA Controllers (Recommended)

SFRA controllers use the server module for routing and middleware:

'use strict';

var server = require('server');

// Handle GET request
server.get('Show', function (req, res, next) {
    res.render('home/homepage');
    next();
});

// Handle POST request
server.post('Subscribe', function (req, res, next) {
    var email = req.form.email;
    // Process subscription...
    res.json({ success: true });
    next();
});

module.exports = server.exports();

Request Object (req)

req.querystring          // Query parameters: ?q=shoes -> req.querystring.q
req.form                 // Form POST data: req.form.email
req.httpMethod           // HTTP method: 'GET', 'POST', etc.
req.httpHeaders          // Request headers
req.currentCustomer      // Current customer object
req.locale               // Current locale
req.session              // Session object

Response Object (res)

res.render('template', model)   // Render ISML template with data
res.json(object)                // Return JSON response
res.redirect(url)               // Redirect to URL
res.setViewData(data)           // Add data to view model
res.getViewData()               // Get current view model
res.setStatusCode(code)         // Set HTTP status code

Middleware

Apply middleware to routes for cross-cutting concerns:

var server = require('server');
var cache = require('*/cartridge/scripts/middleware/cache');
var consentTracking = require('*/cartridge/scripts/middleware/consentTracking');
var csrfProtection = require('*/cartridge/scripts/middleware/csrf');

// Apply caching
server.get('Show', cache.applyDefaultCache, function (req, res, next) {
    res.render('home/homepage');
    next();
});

// Require HTTPS
server.post('Login', server.middleware.https, function (req, res, next) {
    // Handle login...
    next();
});

// CSRF protection for forms
server.post('Submit', csrfProtection.validateAjaxRequest, function (req, res, next) {
    // Handle form submission...
    next();
});

Common Middleware

| Middleware | Purpose | |------------|---------| | server.middleware.https | Require HTTPS connection | | cache.applyDefaultCache | Apply default page caching | | csrfProtection.validateAjaxRequest | Validate CSRF token | | consentTracking.consent | Check tracking consent | | userLoggedIn.validateLoggedIn | Require authenticated user |

Route Events

Execute code at specific points in the request lifecycle:

server.post('Submit', function (req, res, next) {
    var form = req.form;
    res.setViewData({ email: form.email });
    next();
}, function (req, res, next) {
    // Additional middleware
    next();
});

// Execute after all middleware, before render
this.on('route:BeforeComplete', function (req, res) {
    var viewData = res.getViewData();
    // Modify view data if needed
});

Extending Controllers

Extend existing controllers to add or modify functionality:

'use strict';

var server = require('server');
var page = module.superModule;  // Get parent controller

server.extend(page);

// Add new route
server.get('NewRoute', function (req, res, next) {
    res.render('newtemplate');
    next();
});

// Override existing route
server.replace('Show', function (req, res, next) {
    // Custom implementation
    res.render('custom/homepage');
    next();
});

// Prepend to existing route
server.prepend('Show', function (req, res, next) {
    // Runs before original handler
    next();
});

// Append to existing route
server.append('Show', function (req, res, next) {
    // Runs after original handler
    var viewData = res.getViewData();
    viewData.customData = 'value';
    res.setViewData(viewData);
    next();
});

module.exports = server.exports();

Classic Controllers (Non-SFRA)

For non-SFRA sites or simple endpoints, use direct exports:

'use strict';

var ISML = require('dw/template/ISML');

exports.Show = function () {
    var params = request.httpParameterMap;
    var productId = params.pid.stringValue;

    ISML.renderTemplate('product/detail', {
        productId: productId
    });
};
exports.Show.public = true;  // Required: marks function as accessible

exports.GetData = function () {
    var result = { status: 'ok', data: [] };

    response.setContentType('application/json');
    response.writer.print(JSON.stringify(result));
};
exports.GetData.public = true;

Key difference: Classic controllers use exports.FunctionName.public = true instead of the server module.

Module Imports

Import B2C Commerce APIs using require():

// B2C Commerce APIs
var ProductMgr = require('dw/catalog/ProductMgr');
var Transaction = require('dw/system/Transaction');
var Logger = require('dw/system/Logger');
var URLUtils = require('dw/web/URLUtils');
var Resource = require('dw/web/Resource');

// Cartridge modules (use */ for cartridge path resolution)
var collections = require('*/cartridge/scripts/util/collections');
var productHelper = require('*/cartridge/scripts/helpers/productHelpers');

Best Practice: Only require modules when needed, not all at the top of the file.

Error Handling

Wrap operations in try-catch blocks:

server.get('Show', function (req, res, next) {
    try {
        var product = ProductMgr.getProduct(req.querystring.pid);
        if (!product) {
            res.setStatusCode(404);
            res.render('error/notfound');
            return next();
        }
        res.render('product/detail', { product: product });
    } catch (e) {
        Logger.error('Product error: ' + e.message);
        res.setStatusCode(500);
        res.render('error/general');
    }
    next();
});

Generating URLs

Use URLUtils to generate locale-aware URLs:

var URLUtils = require('dw/web/URLUtils');

// Controller URL
var productUrl = URLUtils.url('Product-Show', 'pid', 'ABC123');
// Result: /on/demandware.store/Sites-RefArch-Site/en_US/Product-Show?pid=ABC123

// HTTPS URL
var loginUrl = URLUtils.https('Login-Show');

// Static resource URL
var imageUrl = URLUtils.staticURL('/images/logo.png');

Best Practices

1. Always call next() in SFRA middleware chain
2. Use ViewModels to prepare data for templates
3. Keep controllers thin - move business logic to scripts/helpers
4. Use hooks for functionality that works for both storefront and OCAPI
5. Handle errors gracefully - never expose stack traces
6. Use */cartridge/... for portable module paths

Detailed Reference

For comprehensive patterns and examples:

• SFRA Patterns - Full SFRA patterns with middleware
• Classic Patterns - Non-SFRA controller patterns