springboot-from-zero-ui/index.html at main · dev48v/springboot-from-zero-ui · GitHub

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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>Product CRUD — Spring Boot From Zero (Day 1 · TechFromZero)</title>
<script src="https://cdn.tailwindcss.com"></script>
<style>
  body { font-family: -apple-system, "Inter", sans-serif; }
  .fade-in { animation: fadeIn .35s ease-out; }
  @keyframes fadeIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:none; } }
</style>
</head>
<body class="bg-slate-100 min-h-screen">

<header class="bg-white border-b border-slate-200 sticky top-0 z-50">
  <div class="max-w-6xl mx-auto px-6 py-3 flex items-center justify-between flex-wrap gap-2">
    <div>
      <div class="text-xs text-emerald-600 font-bold uppercase tracking-wider">TechFromZero · Day 1</div>
      <h1 class="text-xl font-bold">☕ Spring Boot — Product CRUD</h1>
    </div>
    <div class="flex gap-2 text-xs">
      <a href="https://dev48v.infy.uk/tech/day1-spring-boot.html" class="bg-amber-100 text-amber-800 px-3 py-1.5 rounded font-semibold hover:bg-amber-200">🧠 Learn</a>
      <a href="https://github.com/dev48v/springboot-from-zero" target="_blank" class="bg-slate-900 text-white px-3 py-1.5 rounded font-semibold hover:bg-slate-700">View Code</a>
      <a href="https://dev48v.infy.uk/techfromzero.php" class="bg-slate-200 px-3 py-1.5 rounded font-semibold hover:bg-slate-300">← All days</a>
    </div>
  </div>
</header>

<main class="max-w-6xl mx-auto p-6">
  <div class="text-center mb-4">
    <p class="text-slate-600">Each click on this UI triggers the <b>same HTTP shape</b> the Spring Boot backend exposes.</p>
    <p class="text-xs text-slate-500 mt-1">Trace panel on the right shows Controller → Service → Repository → SQL. Data persists in your browser only.</p>
  </div>

  <div class="grid lg:grid-cols-3 gap-4">
    <div class="lg:col-span-2 bg-white rounded-2xl border border-slate-200 p-5 shadow">
      <div class="flex items-center justify-between mb-3">
        <h3 class="font-bold">Products</h3>
        <div class="text-xs text-slate-500"><span id="count">0</span> in DB</div>
      </div>

      <form id="form" class="grid grid-cols-12 gap-2 mb-4 pb-4 border-b border-slate-200">
        <input id="name" placeholder="Product name" class="col-span-5 border border-slate-300 rounded-lg px-3 py-2 text-sm" required>
        <input id="price" type="number" step="0.01" placeholder="Price" class="col-span-3 border border-slate-300 rounded-lg px-3 py-2 text-sm" required>
        <input id="stock" type="number" placeholder="Stock" class="col-span-2 border border-slate-300 rounded-lg px-3 py-2 text-sm" required>
        <button id="submit" class="col-span-2 bg-emerald-600 hover:bg-emerald-700 text-white rounded-lg text-sm font-semibold">Save</button>
      </form>

      <div id="rows" class="space-y-2 max-h-[420px] overflow-auto"></div>
    </div>

    <div class="bg-slate-900 rounded-2xl border border-slate-800 p-5 shadow flex flex-col">
      <div class="flex items-center justify-between mb-3">
        <div class="text-xs font-bold uppercase text-emerald-400 tracking-widest">Network · HTTP + SQL</div>
        <button id="clear" class="text-xs text-slate-500 hover:text-white">clear</button>
      </div>
      <div id="trace" class="space-y-3 text-xs font-mono flex-1 overflow-auto min-h-[300px]">
        <div class="text-slate-500 italic">Click a button on the left — watch the request flow.</div>
      </div>
    </div>
  </div>

  <div class="mt-8 bg-white rounded-2xl border border-slate-200 p-5 shadow">
    <h3 class="font-bold mb-2">📐 The 3-layer pattern</h3>
    <p class="text-sm text-slate-500 mb-4">Every Spring Boot REST API on this shape. The Repository line in the trace = the exact JPA call. The SQL underneath = what Hibernate emits.</p>
    <div class="flex items-center justify-between gap-3 flex-wrap">
      <div class="flex-1 min-w-[120px] bg-emerald-50 border-2 border-emerald-300 rounded-xl p-3 text-center">
        <div class="text-xs uppercase font-bold text-emerald-700 tracking-widest">Layer 1</div>
        <div class="font-bold mt-1">Controller</div>
        <div class="text-xs text-slate-500 mt-1">@RestController</div>
      </div>
      <div class="text-2xl text-emerald-500">→</div>
      <div class="flex-1 min-w-[120px] bg-emerald-50 border-2 border-emerald-300 rounded-xl p-3 text-center">
        <div class="text-xs uppercase font-bold text-emerald-700 tracking-widest">Layer 2</div>
        <div class="font-bold mt-1">Service</div>
        <div class="text-xs text-slate-500 mt-1">@Service</div>
      </div>
      <div class="text-2xl text-emerald-500">→</div>
      <div class="flex-1 min-w-[120px] bg-emerald-50 border-2 border-emerald-300 rounded-xl p-3 text-center">
        <div class="text-xs uppercase font-bold text-emerald-700 tracking-widest">Layer 3</div>
        <div class="font-bold mt-1">Repository</div>
        <div class="text-xs text-slate-500 mt-1">JpaRepository</div>
      </div>
      <div class="text-2xl text-emerald-500">→</div>
      <div class="flex-1 min-w-[120px] bg-blue-50 border-2 border-blue-300 rounded-xl p-3 text-center">
        <div class="text-xs uppercase font-bold text-blue-700 tracking-widest">Database</div>
        <div class="font-bold mt-1">MySQL</div>
        <div class="text-xs text-slate-500 mt-1">Hibernate ORM</div>
      </div>
    </div>
  </div>

  <footer class="text-center text-xs text-slate-500 mt-12 pb-8">
    Demo runs in your browser via localStorage. The actual Spring Boot backend at
    <a href="https://github.com/dev48v/springboot-from-zero" class="text-emerald-600 underline" target="_blank">github.com/dev48v/springboot-from-zero</a>
    exposes the SAME endpoints. Run it locally → swap the API base URL in this UI and you get a real full-stack app.
  </footer>
</main>

<script>
const LS_KEY = "tfz_d1_ui";
let nextId = 1, items = [];
try {
  const saved = JSON.parse(localStorage.getItem(LS_KEY) || "null");
  if (saved) { items = saved.items ?? []; nextId = saved.nextId ?? 1; }
} catch {}
if (!items.length) {
  items = [
    { id: 1, name: "Widget",   price: 9.99,  stock: 100 },
    { id: 2, name: "Gadget",   price: 24.50, stock: 35  },
    { id: 3, name: "Sprocket", price: 4.20,  stock: 200 }
  ];
  nextId = 4;
}

const rows = document.getElementById("rows");
const count = document.getElementById("count");
const trace = document.getElementById("trace");
const form = document.getElementById("form");
const nameI = document.getElementById("name");
const priceI = document.getElementById("price");
const stockI = document.getElementById("stock");
const submit = document.getElementById("submit");
let editingId = null;

const escapeHtml = s => String(s).replace(/[&<>"]/g, c => ({"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;"}[c]));
const persist = () => localStorage.setItem(LS_KEY, JSON.stringify({ items, nextId }));

const COLOR = { GET: "text-blue-300", POST: "text-emerald-300", PUT: "text-amber-300", DELETE: "text-red-300" };
function logTrace(method, path, body, sql, response) {
  if (trace.firstElementChild && trace.firstElementChild.classList.contains("italic")) trace.innerHTML = "";
  const block = document.createElement("div");
  block.className = "bg-slate-800 border border-slate-700 rounded-lg p-3 fade-in";
  block.innerHTML = `
    <div class="flex items-center gap-2 mb-1">
      <span class="${COLOR[method]} font-bold">${method}</span>
      <span class="text-slate-200">${path}</span>
    </div>
    ${body ? `<div class="text-slate-500 mb-1">body: <span class="text-slate-300">${escapeHtml(JSON.stringify(body))}</span></div>` : ""}
    <div class="text-emerald-400 ml-2">↓ Controller.${method.toLowerCase()}()</div>
    <div class="text-emerald-400 ml-6">↓ Service.${method.toLowerCase()}()</div>
    <div class="text-emerald-400 ml-10">↓ Repository</div>
    <div class="text-blue-400 ml-14">↓ <span class="text-blue-300">${sql}</span></div>
    ${response ? `<div class="text-slate-500 mt-1">response: <span class="text-emerald-200">${escapeHtml(JSON.stringify(response))}</span></div>` : ""}
  `;
  trace.prepend(block);
}

function render() {
  count.textContent = items.length;
  rows.innerHTML = items.map(p => `
    <div class="flex items-center gap-3 p-3 rounded-lg border border-slate-200 hover:border-emerald-300 hover:bg-emerald-50/40 group">
      <div class="w-8 h-8 bg-emerald-100 text-emerald-700 rounded font-mono text-xs font-bold flex items-center justify-center">${p.id}</div>
      <div class="flex-1">
        <div class="font-semibold text-sm">${escapeHtml(p.name)}</div>
        <div class="text-xs text-slate-500">$${p.price.toFixed(2)} · ${p.stock} in stock</div>
      </div>
      <button data-edit="${p.id}" class="text-xs text-amber-700 hover:underline opacity-0 group-hover:opacity-100">Edit</button>
      <button data-del="${p.id}"  class="text-xs text-red-700 hover:underline opacity-0 group-hover:opacity-100">Delete</button>
    </div>
  `).join("");
  rows.querySelectorAll("[data-del]").forEach(b => b.onclick = () => doDelete(+b.dataset.del));
  rows.querySelectorAll("[data-edit]").forEach(b => b.onclick = () => startEdit(+b.dataset.edit));
}

logTrace("GET", "/api/products", null, "SELECT * FROM products", items);

form.addEventListener("submit", (e) => {
  e.preventDefault();
  const body = { name: nameI.value, price: +priceI.value, stock: +stockI.value };
  if (editingId !== null) {
    const idx = items.findIndex(p => p.id === editingId);
    if (idx >= 0) {
      items[idx] = { ...items[idx], ...body };
      logTrace("PUT", `/api/products/${editingId}`, body,
        `UPDATE products SET name='${body.name}', price=${body.price}, stock=${body.stock} WHERE id=${editingId}`,
        items[idx]);
    }
    editingId = null;
    submit.textContent = "Save";
  } else {
    const created = { id: nextId++, ...body };
    items.push(created);
    logTrace("POST", "/api/products", body,
      `INSERT INTO products(name, price, stock) VALUES('${body.name}', ${body.price}, ${body.stock})`,
      created);
  }
  persist();
  render();
  form.reset();
});

function startEdit(id) {
  const p = items.find(x => x.id === id);
  if (!p) return;
  nameI.value = p.name; priceI.value = p.price; stockI.value = p.stock;
  editingId = id; submit.textContent = "Update"; nameI.focus();
  logTrace("GET", `/api/products/${id}`, null, `SELECT * FROM products WHERE id=${id}`, p);
}

function doDelete(id) {
  items = items.filter(p => p.id !== id);
  persist();
  render();
  logTrace("DELETE", `/api/products/${id}`, null, `DELETE FROM products WHERE id=${id}`, { status: 204 });
}

document.getElementById("clear").onclick = () => {
  trace.innerHTML = `<div class="text-slate-500 italic">Click a button on the left — watch the request flow.</div>`;
};

render();
</script>
</body>
</html>