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# Cart Popup Component
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## Contents
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- [Overview](#overview)
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- [When to Show Cart Popup](#when-to-show-cart-popup)
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- [Layout Patterns](#layout-patterns)
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- [Cart Display](#cart-display)
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- [Actions and CTAs](#actions-and-ctas)
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- [Empty State](#empty-state)
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- [Mobile Considerations](#mobile-considerations)
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- [Checklist](#checklist)
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## Overview
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Cart popup (mini cart/cart drawer) shows quick cart overview without navigating away. Opens from cart icon click or after adding items.
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**⚠️ CRITICAL: Always display variant details (size, color, material, etc.) in cart popup, not just product titles.**
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**Assumed knowledge**: AI agents know how to build modals, dialogs, and overlays. This focuses on ecommerce-specific patterns.
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**Cart popup vs full cart page:**
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- Popup: Quick overview, fast checkout path, continue shopping easily
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- Full page: Detailed review, promo codes, complex operations
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- **Recommended**: Both - popup for speed, full cart page for details
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## When to Show Cart Popup
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**Trigger options:**
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1. **On cart icon click** (always) - Click cart icon in navbar opens popup
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2. **After adding to cart** (recommended) - Auto-open popup when item added, confirms action, allows checkout or continue shopping
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3. **Hover cart icon** (desktop only, optional) - Quick peek on hover. Can be accidental, not recommended.
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**Add-to-cart feedback alternatives:**
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- Show popup (most common) - Immediate confirmation, clear path to checkout
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- Toast only (less intrusive) - Small notification, user clicks cart icon to see details
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- Navigate to cart page (traditional) - Goes directly to full cart page, less common now
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## Layout Patterns
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**Two common patterns:**
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**1. Dropdown (recommended for simplicity):**
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- Drops down from cart icon, positioned below navbar
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- Width: 280-320px, max height with scroll
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- No backdrop overlay (click outside to close)
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- Better for few items, simpler implementation
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**2. Slide-in drawer (more prominent):**
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- Slides from right, full height, width 320-400px (desktop) or 80-90% (mobile)
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- Semi-transparent backdrop overlay (click to close)
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- Better for multiple items or complex carts
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**Both patterns have:**
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- Header: Title + item count + close button (optional for dropdown)
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- Scrollable content: List of cart items
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- Sticky footer: Subtotal + action buttons (Checkout, View Cart)
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## Cart Display
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**Fetch cart data from backend:**
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- Cart ID from localStorage
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- Line items (products, variants, quantities, prices)
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- Cart totals (subtotal, tax, shipping)
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- See connecting-to-backend.md for backend integration
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**When to fetch:**
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- On app initialization (update cart icon badge)
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- On popup open (show loading state)
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- After cart updates (add/remove/change quantity)
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**State management:**
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- Store cart data globally (React Context or TanStack Query)
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- Persist cart ID in localStorage
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- Optimistic UI updates (update immediately, revert on error)
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- **CRITICAL: Clear cart state after order is placed** - See connecting-to-backend.md for cart cleanup pattern
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- Common issue: Cart popup shows old items after checkout because cart state wasn't cleared
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- See connecting-to-backend.md for cart state patterns
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**Cart item display:**
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**CRITICAL: Always show variant details (size, color, material, etc.) for each cart item.**
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Without variant details, users can't confirm they added the correct variant. This is especially critical when products have multiple options.
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- Product image (60-80px thumbnail)
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- Product title (truncated to 2 lines)
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- **Variant details (REQUIRED)**: Size, color, material, or other variant options
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- Format: "Size: Large, Color: Black" or "Large / Black"
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- Show ALL selected variant options, not just product title
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- Display below title, smaller text (gray)
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- Quantity controls (+/- buttons, debounce 300-500ms)
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- Unit price and total price (line item total = price × quantity)
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- Remove button (X icon, no confirmation needed)
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**Why variant details are critical:**
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- User confirmation: "Did I add the right size?"
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- Prevents cart abandonment from uncertainty
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- Allows corrections before checkout
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- Essential for products with multiple variants (clothing, shoes, configurable products)
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## Actions and CTAs
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**Cart summary display:**
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- Subtotal (sum of all items)
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- Shipping and tax: "Calculated at checkout" or actual amount
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- Total: Bold and prominent
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**Free shipping indicator (optional):**
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- "Add $25 more for free shipping" with progress bar
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- Encourages larger orders, updates as cart changes
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**Promo codes:**
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- Usually NOT in cart popup (too cramped)
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- Reserve for full cart page
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- Exception: Simple code input if space permits
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**Action buttons:**
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1. **Checkout** (primary) - Most prominent, high contrast (brand color), navigates to checkout
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2. **View Cart** (secondary) - Outline or subtle, navigates to full cart page
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Both buttons full-width, 44-48px height on mobile.
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## Empty State
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Show icon/illustration + "Your cart is empty" + "Continue Shopping" button. Centered, friendly, minimal design.
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## Loading and Error States
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**On popup open**: Show skeleton/placeholder while fetching (avoid blank screen)
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**During updates**:
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- Quantity changes: Inline spinner, disable controls, debounce 300-500ms
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- Item removal: Fade out animation, disable remove button during request
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- Add to cart: Loading indicator on button ("Adding...")
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**Error handling**:
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- Network errors: Show retry option, don't close popup
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- Invalid cart ID: Create new cart automatically
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- Out of stock: Disable quantity increase, show message
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- Revert optimistic updates on failure
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**Animations**: Smooth transitions (250-350ms), slide-in drawer, backdrop fade-in/out. Highlight newly added items.
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## Mobile Considerations
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**Dropdown on mobile:**
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- Full-width (100% minus margins)
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- Max height 60-70% viewport, scrollable
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- Tap outside to close
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**Drawer on mobile:**
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- 85-95% screen width or full screen
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- Slides from right or bottom
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- Swipe to close gesture supported
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- Backdrop overlay
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**Mobile adjustments:**
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- Large touch targets (44-48px minimum)
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- Full-width action buttons (48-52px height)
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- Smaller images (60px), truncate titles
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- Sticky footer with actions
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- Large close button (44x44px)
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## Checklist
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**Essential features:**
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- [ ] Opens on cart icon click
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- [ ] Dropdown (280-320px) or drawer (320-400px) layout
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- [ ] Close button or click outside to close
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- [ ] Backdrop overlay if drawer
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- [ ] **CRITICAL: Cart items show variant details (size, color, etc.) - not just product title**
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- [ ] Cart items with image, title, variant options, quantity, prices
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- [ ] Quantity controls (+/- buttons, debounced)
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- [ ] Remove item button
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- [ ] Subtotal displayed
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- [ ] Checkout button (primary)
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- [ ] View Cart button (secondary)
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- [ ] Empty state with "Continue Shopping" CTA
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- [ ] Loading states (skeleton/spinner)
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- [ ] Smooth animations (250-350ms)
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- [ ] Mobile: Full-width dropdown or 85-95% drawer
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- [ ] Touch targets 44-48px minimum
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- [ ] `role="dialog"` and `aria-modal="true"`
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- [ ] ARIA labels on cart button ("Shopping cart with 3 items")
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- [ ] Keyboard accessible (focus trap, Escape closes, return focus)
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- [ ] Screen reader announcements (item added/removed)
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- [ ] Real-time cart count badge updates
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