CodeYourFuture · mandipsanger · Aug 20, 2026 · Aug 20, 2026 · Aug 20, 2026 · Aug 20, 2026
diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
@@ -1,19 +1,23 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title> </title>
+    <title>The Book Library</title>
+
     <meta
       charset="utf-8"
       name="viewport"
       content="width=device-width, initial-scale=1.0"
     />
+
     <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>
+
     <link
       rel="stylesheet"
       href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
     />
+
     <link rel="stylesheet" type="text/css" href="style.css" />
   </head>
 
@@ -23,50 +27,67 @@ <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"
+    >
       Add new book
     </button>
 
     <div id="demo" class="collapse">
       <div class="form-group">
+
+        <!-- Title -->
         <label for="title">Title:</label>
         <input
-          type="title"
+          type="text"
           class="form-control"
           id="title"
           name="title"
           required
         />
-        <label for="author">Author: </label>
+
+        <!-- Author -->
+        <label for="author">Author:</label>
         <input
-          type="author"
+          type="text"
           class="form-control"
           id="author"
           name="author"
           required
         />
+
+        <!-- Pages -->
         <label for="pages">Pages:</label>
         <input
           type="number"
           class="form-control"
           id="pages"
           name="pages"
+          min="1"
+          step="1"
           required
         />
+
+        <!-- Read -->
         <label class="form-check-label">
           <input
             type="checkbox"
             class="form-check-input"
             id="check"
-            value=""
-          />Read
+          />
+          Read
         </label>
+
+        <!-- Submit -->
         <input
           type="submit"
           value="Submit"
           class="btn btn-primary"
           onclick="submit();"
         />
+
       </div>
     </div>
 
@@ -80,6 +101,7 @@ <h1>Library</h1>
           <th></th>
         </tr>
       </thead>
+
       <tbody>
         <tr>
           <td></td>
@@ -93,4 +115,4 @@ <h1>Library</h1>
 
     <script src="script.js"></script>
   </body>
-</html>
+</html>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
@@ -1,22 +1,18 @@
 let myLibrary = [];
 
-window.addEventListener("load", function (e) {
+window.addEventListener("load", function () {
   populateStorage();
   render();
 });
 
 function populateStorage() {
   if (myLibrary.length == 0) {
-    let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
-    let book2 = new Book(
-      "The Old Man and the Sea",
-      "Ernest Hemingway",
-      "127",
-      true
+    // Initialize sample data with two books
+    myLibrary.push(new Book("Robinson Crusoe", "Daniel Defoe", "252", true));
+
+    myLibrary.push(
+      new Book("The Old Man and the Sea", "Ernest Hemingway", "127", true)
     );
-    myLibrary.push(book1);
-    myLibrary.push(book2);
-    render();
   }
 }
 
@@ -25,22 +21,44 @@ const author = document.getElementById("author");
 const pages = document.getElementById("pages");
 const check = document.getElementById("check");
 
-//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 == ""
-  ) {
+  // remove empty spaces before and after author and title input
+  title.value = title.value.trim();
+  author.value = author.value.trim();
+
+  // Check for empty input fields
+  if (!title.value || !author.value || !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();
+    return;
+  }
+
+  // check if page number is a valid integer > 0
+  const pageNumber = Number(pages.value);
+
+  if (!Number.isInteger(pageNumber) || pageNumber <= 0) {
+    alert("Number of pages needs to be a valid integer greater than 0!");
+    return;
   }
+
+  // Create a new book object with input data
+  const newBook = new Book(
+    title.value,
+    author.value,
+    pages.value,
+    check.checked
+  );
+
+  // Add the new book to the library
+  myLibrary.push(newBook);
+
+  // Update the display
+  render();
+
+  // Clear the form
+  title.value = "";
+  author.value = "";
+  pages.value = "";
+  check.checked = false;
 }
 
 function Book(title, author, pages, check) {
@@ -53,51 +71,48 @@ 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-- {
+
+  // Remove existing rows except header
+  for (let n = rowsNumber - 1; n > 0; n--) {
     table.deleteRow(n);
   }
-  //insert updated row and cells
-  let 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
+
+  for (let i = 0; i < myLibrary.length; i++) {
+    let row = table.insertRow();
+
+    // Insert cells
+    row.insertCell().innerText = myLibrary[i].title;
+    row.insertCell().innerText = myLibrary[i].author;
+    row.insertCell().innerText = myLibrary[i].pages;
+
+    // Read/Unread button
+    let readCell = row.insertCell();
+
     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;
+    changeBut.innerText = myLibrary[i].check ? "Yes" : "No";
 
     changeBut.addEventListener("click", function () {
       myLibrary[i].check = !myLibrary[i].check;
       render();
     });
 
-    //add delete button to every row and render again
-    let delButton = document.createElement("button");
-    delBut.id = i + 5;
-    deleteCell.appendChild(delBut);
+    readCell.appendChild(changeBut);
+
+    // Delete button
+    let deleteCell = row.insertCell();
+
+    let delBut = document.createElement("button");
     delBut.className = "btn btn-warning";
-    delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
+    delBut.innerText = "Delete";
+
+    delBut.addEventListener("click", function () {
       alert(`You've deleted title: ${myLibrary[i].title}`);
+
       myLibrary.splice(i, 1);
       render();
     });
+
+    deleteCell.appendChild(delBut);
   }
 }
diff --git a/debugging/book-library/style.css b/debugging/book-library/style.css
@@ -15,5 +15,5 @@
 }
 
 button.btn-info {
-  margin: 20px;
+  margin: 30px;
 }