CodeYourFuture · Iswanna · Dec 9, 2025 · Dec 9, 2025 · Dec 9, 2025 · Dec 9, 2025
diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
@@ -1,15 +1,16 @@
-<!DOCTYPE html>
-<html>
+<!doctype html>
+<html lang="en">
   <head>
-    <title> </title>
-    <meta
-      charset="utf-8"
-      name="viewport"
-      content="width=device-width, initial-scale=1.0"
-    />
+    <meta charset="utf-8">
+    <title>Library — Add books to your virtual library</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+
+    <!-- Dependencies -->
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
+
+    <!-- Styles -->
     <link
       rel="stylesheet"
       href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
@@ -23,50 +24,59 @@ <h1>Library</h1>
       <p>Add books to your virtual library</p>
     </div>
 
-    <button data-toggle="collapse" data-target="#demo" class="btn btn-info">
+    <button data-toggle="collapse" data-target="#demo" class="btn btn-info" type="button">
       Add new book
     </button>
 
     <div id="demo" class="collapse">
       <div class="form-group">
         <label for="title">Title:</label>
         <input
-          type="title"
+          type="text"
           class="form-control"
           id="title"
           name="title"
           required
         />
-        <label for="author">Author: </label>
+
+        <label for="author">Author:</label>
         <input
-          type="author"
+          type="text"
           class="form-control"
           id="author"
           name="author"
           required
         />
+
         <label for="pages">Pages:</label>
         <input
           type="number"
           class="form-control"
           id="pages"
           name="pages"
+          min="1"
+          step="1"
           required
         />
-        <label class="form-check-label">
+
+        <div class="form-check mt-2">
           <input
             type="checkbox"
             class="form-check-input"
             id="check"
-            value=""
-          />Read
-        </label>
-        <input
-          type="submit"
-          value="Submit"
-          class="btn btn-primary"
-          onclick="submit();"
-        />
+            name="check"
+          />
+          <label class="form-check-label" for="check">Read</label>
+        </div>
+
+        <!-- Explicit type="button" to avoid default form submission -->
+        <button
+          type="button"
+          class="btn btn-primary mt-3"
+          id="submitBtn"
+        >
+          Submit
+        </button>
       </div>
     </div>
 
@@ -77,20 +87,13 @@ <h1>Library</h1>
           <th>Author</th>
           <th>Number of Pages</th>
           <th>Read</th>
-          <th></th>
+          <th>Actions</th>
         </tr>
       </thead>
-      <tbody>
-        <tr>
-          <td></td>
-          <td></td>
-          <td></td>
-          <td></td>
-          <td></td>
-        </tr>
-      </tbody>
+      <tbody></tbody>
     </table>
 
-    <script src="script.js"></script>
+    <!-- Load script at end of body; modules are deferred automatically -->
+    <script src="script.js" type="module"></script>
   </body>
-</html>
+</html>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
@@ -3,44 +3,77 @@ let myLibrary = [];
 window.addEventListener("load", function (e) {
   populateStorage();
   render();
+
+  // Attach submit listener (prevent default form submission)
+  const submitBtn = document.getElementById("submitBtn");
+  if (submitBtn) {
+    submitBtn.addEventListener("click", function (evt) {
+      evt.preventDefault();
+      submit();
+    });
+  }
 });
 
 function populateStorage() {
   if (myLibrary.length == 0) {
-    let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
+    let book1 = new Book("Robinson Crusoe", "Daniel Defoe", 252, true);
     let book2 = new Book(
       "The Old Man and the Sea",
       "Ernest Hemingway",
-      "127",
+      127,
       true
     );
     myLibrary.push(book1);
     myLibrary.push(book2);
-    render();
   }
 }
 
-const title = document.getElementById("title");
-const author = document.getElementById("author");
-const pages = document.getElementById("pages");
-const check = document.getElementById("check");
+const titleInput = document.getElementById("title");
+const authorInput = document.getElementById("author");
+const pagesInput = document.getElementById("pages");
+const readCheckbox = document.getElementById("check");
+
+// Non-blocking success message (appears briefly and fades out)
+function showSuccess(message) {
+  const alertEl = document.createElement("div");
+  alertEl.className = "alert alert-success";
+  alertEl.textContent = message;
+  alertEl.style.position = "fixed";
+  alertEl.style.top = "1rem";
+  alertEl.style.right = "1rem";
+  alertEl.style.zIndex = "1050";
+  document.body.appendChild(alertEl);
+
+  setTimeout(() => {
+    alertEl.style.transition = "opacity 0.3s";
+    alertEl.style.opacity = "0";
+    setTimeout(() => alertEl.remove(), 300);
+  }, 2500);
+}
 
 //check the right input from forms and if its ok -> add the new book (object in array)
 //via Book function and start render function
 function submit() {
-  if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
-  ) {
-    alert("Please fill all fields!");
-    return false;
-  } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
-    render();
+  const title = titleInput.value.trim();
+  const author = authorInput.value.trim();
+  const pages = Number(pagesInput.value);
+
+  // Validate title and author
+  if (title === "" || author === "") {
+    alert("Title and author cannot be empty.");
+    return;
+  }
+
+  // Validate pages
+  if (Number.isNaN(pages) || pages <= 0) {
+    alert("Pages must be a positive number.");
+    return;
   }
+
+  // Create and add book
+  let book = new Book(title, author, pages, readCheckbox.checked);
+  myLibrary.push(book);
+  render();
 }
 
 function Book(title, author, pages, check) {
@@ -51,53 +84,48 @@ function Book(title, author, pages, check) {
 }
 
 function render() {
-  let table = document.getElementById("display");
-  let rowsNumber = table.rows.length;
-  //delete old table
-  for (let n = rowsNumber - 1; n > 0; n-- {
-    table.deleteRow(n);
-  }
-  //insert updated row and cells
-  let length = myLibrary.length;
+  const table = document.getElementById("display");
+  const tbody = table.tBodies[0] || table.createTBody();
+
+  // Clear all data rows while preserving the header
+  tbody.innerHTML = "";
+
+  const length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
-    let titleCell = row.insertCell(0);
-    let authorCell = row.insertCell(1);
-    let pagesCell = row.insertCell(2);
-    let wasReadCell = row.insertCell(3);
-    let deleteCell = row.insertCell(4);
-    titleCell.innerHTML = myLibrary[i].title;
-    authorCell.innerHTML = myLibrary[i].author;
-    pagesCell.innerHTML = myLibrary[i].pages;
-
-    //add and wait for action for read/unread button
-    let changeBut = document.createElement("button");
-    changeBut.id = i;
-    changeBut.className = "btn btn-success";
-    wasReadCell.appendChild(changeBut);
-    let readStatus = "";
-    if (myLibrary[i].check == false) {
-      readStatus = "Yes";
-    } else {
-      readStatus = "No";
-    }
-    changeBut.innerText = readStatus;
+    const book = myLibrary[i];
+    const row = tbody.insertRow();
+
+    const titleCell = row.insertCell(0);
+    const authorCell = row.insertCell(1);
+    const pagesCell = row.insertCell(2);
+    const wasReadCell = row.insertCell(3);
+    const deleteCell = row.insertCell(4);
+
+    titleCell.textContent = book.title;
+    authorCell.textContent = book.author;
+    pagesCell.textContent = book.pages;
 
+    // Read/unread toggle button
+    const changeBut = document.createElement("button");
+    changeBut.className = "btn btn-success";
+    changeBut.textContent = book.check ? "Yes" : "No";
     changeBut.addEventListener("click", function () {
       myLibrary[i].check = !myLibrary[i].check;
       render();
     });
+    wasReadCell.appendChild(changeBut);
 
-    //add delete button to every row and render again
-    let delButton = document.createElement("button");
-    delBut.id = i + 5;
-    deleteCell.appendChild(delBut);
+    // Delete button (confirm before deleting, then show non-blocking success)
+    const delBut = document.createElement("button");
     delBut.className = "btn btn-warning";
-    delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
-      alert(`You've deleted title: ${myLibrary[i].title}`);
-      myLibrary.splice(i, 1);
-      render();
+    delBut.textContent = "Delete";
+    delBut.addEventListener("click", function () {
+      if (confirm(`Are you sure you want to delete "${book.title}"?`)) {
+        myLibrary.splice(i, 1);
+        render();
+        showSuccess(`Deleted "${book.title}"`);
+      }
     });
+    deleteCell.appendChild(delBut);
   }
 }