examples/advance/food_delivery_tracker/frontend_design.txt


Single HTML page with JavaScript for dynamic content:

1. Layout:
   - Header with app title and user info
   - Sidebar with navigation menu
   - Main content area
   - Footer with copyright info

2. Components:
   - Search bar (for orders and delivery events)
   - Order list view
   - Order details view
   - Delivery event list view
   - Forms for creating/updating delivery events and order status

3. Functionality:
   - Asynchronous API calls using fetch()
   - Dynamic content rendering without page reloads
   - Real-time updates using WebSocket for new delivery events

4. Styling:
   - Use CSS Grid for layout
   - Responsive design for mobile and desktop
   - Modern, clean UI with clear typography and intuitive controls

HTML structure pseudocode:

```html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Delivery Event Logger</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <header>
        <!-- App title and user info -->
    </header>
    
    <nav>
        <!-- Sidebar navigation menu -->
    </nav>
    
    <main>
        <section id="search">
            <!-- Search bar -->
        </section>
        
        <section id="order-list">
            <!-- Order list view -->
        </section>
        
        <section id="order-details" class="hidden">
            <!-- Order details view -->
        </section>
        
        <section id="delivery-events">
            <!-- Delivery event list view -->
        </section>
        
        <section id="forms" class="hidden">
            <!-- Forms for creating/updating events and orders -->
        </section>
    </main>
    
    <footer>
        <!-- Copyright info -->
    </footer>
    
    <script src="app.js"></script>
</body>
</html>
```

JavaScript pseudocode for main app functionality:

```javascript
// API calls
async function fetchOrders(params) {
    // Fetch orders from API
}

async function fetchOrderDetails(orderId) {
    // Fetch order details from API
}

async function fetchDeliveryEvents(params) {
    // Fetch delivery events from API
}

async function createDeliveryEvent(eventData) {
    // Create new delivery event via API
}

async function updateOrderStatus(orderId, status) {
    // Update order status via API
}

// UI update functions
function renderOrderList(orders) {
    // Render order list in UI
}

function renderOrderDetails(order) {
    // Render order details in UI
}

function renderDeliveryEvents(events) {
    // Render delivery events in UI
}

// Event listeners
document.querySelector('#search-form').addEventListener('submit', handleSearch);
document.querySelector('#create-event-form').addEventListener('submit', handleCreateEvent);
document.querySelector('#update-status-form').addEventListener('submit', handleUpdateStatus);

// WebSocket for real-time updates
const socket = new WebSocket('ws://localhost:5000/ws');
socket.onmessage = function(event) {
    // Handle real-time updates
};

// Initialize app
function init() {
    // Fetch initial data and set up UI
}

init();
```