CodeYourFuture · cywong-dev · Aug 7, 2026 · Aug 7, 2026 · Aug 7, 2026 · Aug 7, 2026
diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
@@ -1,11 +1,9 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title> </title>
-    <meta
-      charset="utf-8"
-      name="viewport"
-      content="width=device-width, initial-scale=1.0"
+    <title>Virtual Library</title>
+    <meta charset="utf-8" />
+    <meta 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>
@@ -31,15 +29,15 @@ <h1>Library</h1>
       <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>
         <input
-          type="author"
+          type="text"
           class="form-control"
           id="author"
           name="author"
@@ -51,6 +49,9 @@ <h1>Library</h1>
           class="form-control"
           id="pages"
           name="pages"
+          min="1"
+          step="1"
+          oninput="this.value = this.value.replace(/[^0-9]/g, '').replace(/^0+/, '');"
           required
         />
         <label class="form-check-label">

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
@@ -1,4 +1,4 @@
-let myLibrary = [];
+const myLibrary = [];
 
 window.addEventListener("load", function (e) {
   populateStorage();
@@ -7,40 +7,67 @@ window.addEventListener("load", function (e) {
 
 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
-    );
-    myLibrary.push(book1);
-    myLibrary.push(book2);
-    render();
+    let book1 = new Book("Robison Crusoe", "Daniel Defoe", 252, true);
+    let book2 = new Book("The Old Man and the Sea","Ernest Hemingway",127,true);
+
+
+// Date : 9/8/2026
+// Purpose : Fix the problem "2. Error in console when you try to add a book"
+// Change : replace Librarty with the correct variable myLibrary    
+    myLibrary.push(book1, book2);
   }
 }
 
-const title = document.getElementById("title");
-const author = document.getElementById("author");
-const pages = document.getElementById("pages");
-const check = document.getElementById("check");
+const titleElement = document.getElementById("title");
+const authorElement = document.getElementById("author");
+const pagesElement = document.getElementById("pages");
+const checkElement = document.getElementById("check");
+
+// Helper function to display messages to the user in the UI
+function displayStatusMessage(message, isError = false) {
+  const statusContainer = document.getElementById("status-message") || createStatusContainer();
+  statusContainer.textContent = message;
+  statusContainer.style.color = isError ? "red" : "black";
+}
+
+function createStatusContainer() {
+  const container = document.createElement("div");
+  container.id = "status-message";
+  container.style.padding = "1rem";
+  container.style.fontSize = "1.2rem";
+  container.style.textAlign = "center";
+
+  // Prepend to body or main container
+  document.body.prepend(container);
+  return container;
+}
+
 
 //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() {
+
+  // Date : 9/8/2026
+  // Purpose : Fix the problem "3. It uses the title name as the author name"
+  // Change : replace the second title with author.value to fix the bug 
+  let titleValue = titleElement.value.trim();
+  let authorValue = authorElement.value.trim();
+  let pagesValue = pagesElement.value.trim();
+
   if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
+    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();
+    displayStatusMessage("Please fill all fields!", true);
+    return;
   }
+
+  let book = new Book(titleValue, authorValue, pagesValue, checkElement.checked);
+
+  myLibrary.push(book);
+  render();
+
 }
 
 function Book(title, author, pages, check) {
@@ -52,52 +79,65 @@ 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;
-  for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
+  table.innerHTML = "";
+
+  let thead = document.createElement("thead");
+  thead.className = "thead-dark";
+  thead.innerHTML = `
+    <tr>
+      <th>Title</th>
+      <th>Author</th>
+      <th>Number of Pages</th>
+      <th>Read</th>
+      <th></th>
+    </tr>
+  `;
+  table.appendChild(thead);
+
+  // Date : 9/8/2026
+  // Purpose : Fix the problem "1. Website loads but doesn't show any books"
+  // Change : Missing ) → script stops executing → nothing renders and add back the closing ) to fix it    
+  for (let i = 0; i < myLibrary.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;
-
-    changeBut.addEventListener("click", function () {
+
+    // Date : 9/8/2026
+    // Purpose : Fix the problem "5. When I add a book that I say I've read - it saves the wrong answer"
+    // Change : Correct the logic - if check == true, that means the book was read, so it should show Yes.
+    changeBut.innerText = myLibrary[i].check ? "Yes" : "No";
+    changeBut.addEventListener("click", () => {
       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);
-    delBut.className = "btn btn-warning";
-    delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
-      alert(`You've deleted title: ${myLibrary[i].title}`);
+    // Date : 9/8/2026
+    // Purpose : Fix the problem "4. Delete button is broken"
+    // Change : Fix the incorrect nanmes "delBut" button and "clicks" event to the correct one "delButton" and "click" respectively     
+    delButton.className = "btn btn-warning";
+    delButton.innerText = "Delete";
+    delButton.addEventListener("click", () => {
+      displayStatusMessage(`You've deleted title: ${myLibrary[i].title}`,false);
       myLibrary.splice(i, 1);
       render();
     });
+    deleteCell.appendChild(delButton);
   }
 }