Hash Routing

Hash routing is a technique used in web development to create single-page applications (SPAs) where the routing is handled entirely on the client-side using URL hashes (fragments). Here's an example of how you can implement hash routing with templates using JavaScript:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hash Routing Example</title>
</head>
<body>
    <header>
        <nav>
            <ul>
                <li><a href="#/">Home</a></li>
                <li><a href="#/about">About</a></li>
                <li><a href="#/contact">Contact</a></li>
            </ul>
        </nav>
    </header>

    <div id="content"></div>

    <script>
        // Define routes and corresponding templates
        const routes = {
            '/': '<h2>Home Page</h2><p>Welcome to the home page!</p>',
            '/about': '<h2>About Page</h2><p>Learn more about us.</p>',
            '/contact': '<h2>Contact Page</h2><p>Contact us for any queries.</p>'
        };

        // Function to render template based on current route
        function renderContent() {
            const hash = window.location.hash;
            const content = document.getElementById('content');
            if (routes[hash]) {
                content.innerHTML = routes[hash];
            } else {
                content.innerHTML = '<h2>Page Not Found</h2><p>The requested page does not exist.</p>';
            }
        }

        // Event listener for hash change
        window.addEventListener('hashchange', renderContent);

        // Initial rendering
        renderContent();
    </script>
</body>
</html>

In this example:

The navigation links use hashes (#/) to specify different routes.
The routes object maps each route to its corresponding template.
The renderContent() function extracts the current route from the hash, retrieves the corresponding template from the routes object, and updates the content of the #content element.
An event listener is added to listen for hash changes (hashchange event) and trigger the renderContent() function accordingly.
The renderContent() function is called initially to render the content based on the initial hash (if any).

This is a simple implementation of hash routing with templates in JavaScript. In a real-world application, you might want to use a more sophisticated routing library like React Router or Vue Router for better management of routes and components.

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