CodeYourFuture · Zadri415 · Aug 6, 2026 · Aug 17, 2026 · Aug 17, 2026 · cjyuan
diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html>
   <head>
     <title> </title>
@@ -31,15 +31,15 @@ <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"
@@ -62,10 +62,10 @@ <h1>Library</h1>
           />Read
         </label>
         <input
-          type="submit"
+          type="button"
           value="Submit"
           class="btn btn-primary"
-          onclick="submit();"
+          onclick="addBook()"
         />
       </div>
     </div>
@@ -91,6 +91,8 @@ <h1>Library</h1>
       </tbody>
     </table>
 
+    <div id="toast" aria-live="polite"></div>
+
     <script src="script.js"></script>
   </body>
 </html>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
@@ -1,103 +1,115 @@
-let myLibrary = [];
+const myLibrary = [];
 
 window.addEventListener("load", function (e) {
   populateStorage();
   render();
 });
 
 function populateStorage() {
-  if (myLibrary.length == 0) {
-    let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
-    let book2 = new Book(
+  // Seed with a couple of books if library is empty
+  if (myLibrary.length === 0) {
+    const book1 = new Book("Robinson Crusoe", "Daniel Defoe", 252, true);
+    const book2 = new Book(
       "The Old Man and the Sea",
       "Ernest Hemingway",
-      "127",
+      127,
       true
     );
-    myLibrary.push(book1);
-    myLibrary.push(book2);
-    render();
+    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 titleInput = document.getElementById("title");
+const authorInput = document.getElementById("author");
+const pagesInput = document.getElementById("pages");
+const checkInput = 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 == ""
-  ) {
-    alert("Please fill all fields!");
+function addBook() {
+  const title = titleInput.value.trim();
+  const author = authorInput.value.trim();
+  const pagesRaw = pagesInput.value.trim();
+  const pages = Number(pagesRaw);
+
+  // Validate AFTER trimming, so whitespace-only input is rejected too
+  if (!title || !author || !pagesRaw || !Number.isFinite(pages) || pages <= 0) {
+    alert("Please fill all fields with valid values!");
     return false;
-  } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
-    render();
   }
+
+  const book = new Book(title, author, pages, checkInput.checked);
+  myLibrary.push(book);
+
+  // clear form inputs
+  titleInput.value = "";
+  authorInput.value = "";
+  pagesInput.value = "";
+  checkInput.checked = false;
+
+  render();
+  return true;
 }
 
-function Book(title, author, pages, check) {
+function Book(title, author, pages, read) {
   this.title = title;
   this.author = author;
-  this.pages = pages;
-  this.check = check;
+  this.pages = pages; // stored as a Number now, not a trimmed string
+  // store as boolean under a descriptive property
+  this.read = !!read;
 }
 
 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);
-    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 () {
-      myLibrary[i].check = !myLibrary[i].check;
+  const table = document.getElementById("display");
+  const tbody = table.getElementsByTagName("tbody")[0];
+
+  // Clear existing rows in one operation instead of removing one at a time
+  tbody.innerHTML = "";
+
+  myLibrary.forEach((book) => {
+    const row = document.createElement("tr");
+
+    const titleCell = document.createElement("td");
+    titleCell.textContent = book.title;
+    row.appendChild(titleCell);
+
+    const authorCell = document.createElement("td");
+    authorCell.textContent = book.author;
+    row.appendChild(authorCell);
+
+    const pagesCell = document.createElement("td");
+    pagesCell.textContent = book.pages;
+    row.appendChild(pagesCell);
+
+    const wasReadCell = document.createElement("td");
+    const changeBut = document.createElement("button");
+    changeBut.className = "btn btn-sm btn-outline-primary";
+    changeBut.textContent = book.read ? "Yes" : "No";
+    changeBut.addEventListener("click", () => {
+      book.read = !book.read;
       render();
     });
+    wasReadCell.appendChild(changeBut);
+    row.appendChild(wasReadCell);
 
-    //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: ${myLibrary[i].title}`);
-      myLibrary.splice(i, 1);
-      render();
+    const deleteCell = document.createElement("td");
+    const delBut = document.createElement("button");
+    delBut.className = "btn btn-sm btn-danger";
+    delBut.textContent = "Delete";
+    delBut.addEventListener("click", () => {
+      if (confirm(`Delete "${book.title}"?`)) {
+        // Look up by object identity, not by closure-captured index,
+        // so this stays correct even if myLibrary is ever reordered
+        // by something other than a full render().
+        const idx = myLibrary.indexOf(book);
+        if (idx === -1) return;
+        myLibrary.splice(idx, 1);
+        render();
+      }
     });
-  }
+    deleteCell.appendChild(delBut);
+    row.appendChild(deleteCell);
+
+    tbody.appendChild(row);
+  });
 }
diff --git a/debugging/book-library/style.css b/debugging/book-library/style.css
@@ -1,19 +1,16 @@
-.form-group {
-  width: 400px;
-  height: 300px;
-  align-self: left;
-  padding-left: 20px;
+#toast {
+  position: fixed;
+  bottom: 1rem;
+  left: 50%;
+  transform: translateX(-50%);
+  background: #333;
+  color: #fff;
+  padding: 0.5rem 1rem;
+  border-radius: 0.25rem;
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity 0.3s ease;
 }
-
-.btn {
-  display: block;
-}
-
-.form-check-label {
-  padding-left: 20px;
-  margin: 5px 0px 5px 0px;
-}
-
-button.btn-info {
-  margin: 20px;
+#toast.show {
+  opacity: 1;
 }