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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>onpopstate — SPA router</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}nav{display:flex;gap:.5rem;flex-wrap:wrap;margin:1rem 0}nav a{padding:.5rem 1rem;border:1px solid #cbd5e1;border-radius:8px;background:#fff;text-decoration:none;color:#334155;font-size:.875rem}nav a.is-active{background:#2563eb;border-color:#2563eb;color:#fff}#view{padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px;max-width:420px}#view h2{margin:0 0 .5rem;font-size:1rem;color:#0f172a}</style>

</head>

<body>

  <h1>Mini SPA with popstate</h1>

  <p>Click nav links, then use Back/Forward — the view syncs from event.state.</p>

  <nav>

    <a href=/home data-route=home>Home</a>

    <a href=/products data-route=products>Products</a>

    <a href=/contact data-route=contact>Contact</a>

  </nav>

  <div id=view><h2>Home</h2><p>Welcome to our site.</p></div>



  <script>

    var views = {

      home: "<h2>Home</h2><p>Welcome to our site.</p>",

      products: "<h2>Products</h2><p>Browse our catalog.</p>",

      contact: "<h2>Contact</h2><p>Send us a message.</p>"

    };



    function render(route) {

      document.getElementById("view").innerHTML = views[route] || views.home;

      document.querySelectorAll("nav a").forEach(function (link) {

        link.classList.toggle("is-active", link.dataset.route === route);

      });

    }



    document.querySelector("nav").addEventListener("click", function (event) {

      var link = event.target.closest("a[data-route]");

      if (!link) return;

      event.preventDefault();

      var route = link.dataset.route;

      history.pushState({ route: route }, "", "/" + route);

      render(route);

    });



    window.addEventListener("popstate", function (event) {

      var route = (event.state && event.state.route) ? event.state.route : "home";

      render(route);

    });



    history.replaceState({ route: "home" }, "", "/home");

    render("home");

  </script>

</body>

</html>
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HTML onpopstate Attribute — SPA router with event.state
