CodeYourFuture · wankoak · Nov 29, 2025 · Nov 29, 2025 · Nov 29, 2025 · Dec 1, 2025
diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
@@ -1,12 +1,10 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
-    <title> </title>
-    <meta
-      charset="utf-8"
-      name="viewport"
-      content="width=device-width, initial-scale=1.0"
-    />
+    <title>My Book 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>
     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.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"
@@ -53,20 +51,20 @@ <h1>Library</h1>
           name="pages"
           required
         />
-        <label class="form-check-label">
+        <div class="form-check-label">
           <input
             type="checkbox"
             class="form-check-input"
             id="check"
-            value=""
-          />Read
-        </label>
-        <input
-          type="submit"
-          value="Submit"
-          class="btn btn-primary"
-          onclick="submit();"
-        />
+          /><span>Read</span>
+        </div>
+        <button
+          type="button"
+          id="submitBtn"
+          class="btn btn-primary mt-2"
+          >
+          Submit
+        </button>
       </div>
     </div>
 

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
@@ -1,103 +1,112 @@
 let myLibrary = [];
 
+// DOM refs 
+const titleInput = document.getElementById("title");
+const authorInput = document.getElementById("author");
+const pagesInput = document.getElementById("pages");
+const checkInput = document.getElementById("check");
+const submitBtn = document.getElementById("submitBtn"); 
+const table = document.getElementById("display");
+
 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(
+    const book1 = new Book("Robison 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");
-
-//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 == ""
-  ) {
+// wire submit button
+submitBtn.addEventListener("click", addBook);
+
+// validate and add book to library
+function addBook() {
+  // trim to avoid spaces-only input
+  const t = titleInput.value.trim();
+  const a = authorInput.value.trim();
+  const pRaw = pagesInput.value.trim();
+
+  if (!t || !a || !pRaw) {
     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;
+  }
+
+  // pages should be a positive integer (prevent "weird" page counts)
+  const pNum = Number(pRaw);
+  if (!Number.isFinite(pNum) || pNum <= 0 || !Number.isInteger(pNum)) {
+    alert("Please enter a valid positive whole number of pages.");
+    return;
   }
+
+  const book = new Book(t, a, pNum, checkInput.checked);
+  myLibrary.push(book);
+
+  // clear inputs and close the collapse
+  titleInput.value = "";
+  authorInput.value = "";
+  pagesInput.value = "";
+  checkInput.checked = false;
+
+  render();
 }
 
-function Book(title, author, pages, check) {
+// Book constructor
+function Book(title, author, pages, read) {
   this.title = title;
   this.author = author;
   this.pages = pages;
-  this.check = check;
+  this.read = !!read;
 }
 
+// render table rows from myLibrary
 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 tbody = table.querySelector("tbody");
+  tbody.innerHTML = "";
+
+  for (let i = 0; i < myLibrary.length; i++) {
+    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 toggle button 
+    const changeBut = document.createElement("button");
+    changeBut.className = "btn btn-sm btn-outline-success";
+    changeBut.textContent = book.read ? "Yes" : "No";
+    changeBut.addEventListener("click", function() {
+      myLibrary[i].read = !myLibrary[i].read;
       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: ${myLibrary[i].title}`);
-      myLibrary.splice(i, 1);
-      render();
+    // Delete button 
+    const delBut = document.createElement("button");
+    delBut.className = "btn btn-sm btn-warning";
+    delBut.textContent = "Delete";
+    delBut.addEventListener("click", function() {
+      if (confirm(`Delete "${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
@@ -1,7 +1,5 @@
 .form-group {
   width: 400px;
-  height: 300px;
-  align-self: left;
   padding-left: 20px;
 }