Middleware for Analytics Event Tracking

Setup a middleware that intercepts specific actions to trigger analytics events, which can be used to track user behavior throughout the application.
<!-- HTML: A simple button to trigger an action -->
<button id='trackEventButton'>Track Event</button>
This is the HTML code for a button element that, when clicked, will trigger an event to be tracked by the analytics middleware.
/* CSS: Just a basic style for the button */
#trackEventButton {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;

#trackEventButton:hover {
    background-color: #45a049;
CSS to style the Track Event button. This includes padding, background color, and hover effect.
// JavaScript: Middleware function for analytics event tracking
function trackEventMiddleware(eventType, eventData) {
    // Placeholder for actual analytics tracking logic
    console.log(`Tracking event type: ${eventType}`, eventData);

    // This is where you could integrate an analytics service
    // Example: analytics.track(eventType, eventData);

document.getElementById('trackEventButton').addEventListener('click', function() {
    trackEventMiddleware('button_click', { elementId: 'trackEventButton' });
This JavaScript defines a middleware function, 'trackEventMiddleware', which acts as a handler to be invoked when an event occurs. The event listener added to the 'trackEventButton' intercepts the click action and triggers the middleware function, simulating a track event function for analytics.