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>
+<!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>
 
@@ -23,51 +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"
+      type="button"
+    >
       Add new book
     </button>
 
     <div id="demo" class="collapse">
-      <div class="form-group">
-        <label for="title">Title:</label>
-        <input
-          type="title"
-          class="form-control"
-          id="title"
-          name="title"
-          required
-        />
-        <label for="author">Author: </label>
-        <input
-          type="author"
-          class="form-control"
-          id="author"
-          name="author"
-          required
-        />
-        <label for="pages">Pages:</label>
-        <input
-          type="number"
-          class="form-control"
-          id="pages"
-          name="pages"
-          required
-        />
-        <label class="form-check-label">
+      <form id="form">
+        <div class="form-group">
+          <!-- Title -->
+          <label for="title">Title:</label>
           <input
-            type="checkbox"
-            class="form-check-input"
-            id="check"
-            value=""
-          />Read
-        </label>
-        <input
-          type="submit"
-          value="Submit"
-          class="btn btn-primary"
-          onclick="submit();"
-        />
-      </div>
+            type="text"
+            class="form-control"
+            id="title"
+            name="title"
+            required
+          />
+
+          <!-- Author -->
+          <label for="author">Author:</label>
+          <input
+            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 -->
+          <div class="form-check">
+            <label class="form-check-label">
+              <input
+                type="checkbox"
+                class="form-check-input"
+                id="check"
+                name="read"
+              />
+              Read
+            </label>
+          </div>
+
+          <!-- Submit -->
+          <button type="submit" class="btn btn-primary">Submit</button>
+        </div>
+      </form>
     </div>
 
     <table class="table" id="display">
@@ -80,15 +100,8 @@ <h1>Library</h1>
           <th></th>
         </tr>
       </thead>
-      <tbody>
-        <tr>
-          <td></td>
-          <td></td>
-          <td></td>
-          <td></td>
-          <td></td>
-        </tr>
-      </tbody>
+
+      <tbody id="book-list"></tbody>
     </table>
 
     <script src="script.js"></script>

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
@@ -1,45 +1,78 @@
-let myLibrary = [];
+const myLibrary = [];
 
-window.addEventListener("load", function (e) {
+const titleInput = document.getElementById("title");
+const authorInput = document.getElementById("author");
+const pagesInput = document.getElementById("pages");
+const readInput = document.getElementById("check");
+const form = document.getElementById("form");
+
+window.addEventListener("load", function () {
   populateStorage();
   render();
+
+  if (form) {
+    form.addEventListener("submit", function (event) {
+      event.preventDefault();
+      submit();
+    });
+  }
 });
 
 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
+  if (myLibrary.length === 0) {
+    // 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();
   }
 }
 
-const title = document.getElementById("title");
-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 == ""
-  ) {
+  // Get cleaned input values
+  const titleValue = titleInput.value.trim();
+  const authorValue = authorInput.value.trim();
+  const pagesValue = pagesInput.value.trim();
+
+  // Check for empty input fields
+  if (!titleValue || !authorValue || !pagesValue) {
     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;
+  }
+
+  // Make sure pages contains digits only
+  if (!/^\d+$/.test(pagesValue)) {
+    alert("Number of pages needs to be a valid integer greater than 0!");
+    return;
+  }
+
+  // Convert pages to a number
+  const pageNumber = Number(pagesValue);
+
+  // Check that pages is greater than zero
+  if (pageNumber <= 0) {
+    alert("Number of pages needs to be a valid integer greater than 0!");
+    return;
+  }
+
+  // Create a new book using cleaned and validated values
+  const newBook = new Book(
+    titleValue,
+    authorValue,
+    pageNumber,
+    readInput.checked
+  );
+
+  // Add the new book
+  myLibrary.push(newBook);
+
+  // Update the display
+  render();
+
+  // Reset the entire form
+  if (form) {
+    form.reset();
   }
 }
 
@@ -51,53 +84,56 @@ 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-- {
+  const table = document.getElementById("display");
+  const rowsNumber = table.rows.length;
+
+  // 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
-    let changeBut = document.createElement("button");
-    changeBut.id = i;
+
+  for (let i = 0; i < myLibrary.length; i++) {
+    const row = table.insertRow();
+
+    // Insert book information
+    row.insertCell().innerText = myLibrary[i].title;
+    row.insertCell().innerText = myLibrary[i].author;
+    row.insertCell().innerText = myLibrary[i].pages;
+
+    // Read/Unread button
+    const readCell = row.insertCell();
+
+    const changeBut = document.createElement("button");
     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
+    const deleteCell = row.insertCell();
+
+    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}`);
+    delBut.innerText = "Delete";
+
+    delBut.addEventListener("click", function () {
+      const deletedTitle = myLibrary[i].title;
+
+      // Delete the book first
       myLibrary.splice(i, 1);
+
+      // Update the display
       render();
+
+      // Show confirmation after deletion
+      alert(`You've deleted title: ${deletedTitle}`);
     });
+
+    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;
 }