Made further debugging changes to index.html and script.js

Author: Maryanne-K

debugging/book-library/index.html

@@ -70,7 +70,7 @@ <h1>Library</h1>
         >
       </div>
     </div>
-
+    <div id="message"></div>
     <table class="table" id="display">
       <thead class="thead-dark">
         <tr>

debugging/book-library/script.js

@@ -1,16 +1,16 @@
-let myLibrary = [];
+const myLibrary = [];
 
 window.addEventListener("load", function (e) {
   populateStorage();
 });
 
 function populateStorage() {
   if (myLibrary.length == 0) {
-    let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
-    let book2 = new Book(
+    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);
@@ -19,26 +19,29 @@ function populateStorage() {
   }
 }
 
-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 == ""||
-    author.value == "" ||
-    pages.value == ""
-  ) {
+  const title = titleInput.value.trim();
+  const author = authorInput.value.trim();
+  const pages = Number(pagesInput.value);
+  const isRead = checkInput.checked;
+  if (!title || !author || pagesInput.value.trim() === "" ) {
     alert("Please fill all fields!");
-    return false;
-  } else {
-    let book = new Book(title.value, author.value, pages.value, check.checked);
-    myLibrary.push(book);
-    render();
+    return;
+  } 
+  if (Number.isNaN(pages) || pages <= 0) {
+    alert("Please enter a valid number of pages!");
+    return;
   }
+  const book = new Book(title, author, pages, isRead);
+  myLibrary.push(book);
+  render();
 }
 
 function Book(title, author, pages, check) {
@@ -48,54 +51,60 @@ function Book(title, author, pages, check) {
   this.check = check;
 }
 
+function showMessage(text) {
+  const msg = document.getElementById("message");
+  msg.innerText = text;
+
+  setTimeout(() => {
+    msg.innerText = "";
+  }, 2000);
+}
+
 function render() {
-  let table = document.getElementById("display");
-  let rowsNumber = table.rows.length;
+  const table = document.getElementById("display");
+
+  table.innerHTML = table.rows[0].outerHTML;
+  myLibrary.forEach((book, index) => {
+    const row = table.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.innerText = book.title;
+    authorCell.innerText = book.author;
+    pagesCell.innerText = book.pages;
+  
   //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 == true) {
-      readStatus = "Yes";
-    } else {
-      readStatus = "No";
-    }
-    changeBut.innerText = readStatus;
-
-    changeBut.addEventListener("click", function () {
-      myLibrary[i].check = !myLibrary[i].check;
+    const toggleReadButton = document.createElement("button");
+    toggleReadButton.className = "btn btn-success";
+    toggleReadButton.innerText = book.check ? "Yes" : "No";
+
+    toggleReadButton.addEventListener("click", () => {
+      book.check = !book.check;
       render();
     });
 
+    wasReadCell.appendChild(toggleReadButton);
+
     //add delete button to every row and render again
-    let delButton = document.createElement("button");
-    delButton.id = i;
-    deleteCell.appendChild(delButton);
-    delButton.className = "btn btn-warning";
-    delButton.innerHTML = "Delete";
-    delButton.addEventListener("click", function () {
-      alert(`You've deleted title: ${myLibrary[i].title}`);
-      myLibrary.splice(i, 1);
+   const deleteButton = document.createElement("button");
+    deleteButton.className = "btn btn-warning";
+    deleteButton.innerText = "Delete";
+
+    deleteButton.addEventListener("click", () => {
+      showMessage(`Book "${book.title}" deleted!`);
+      myLibrary.splice(index, 1);
       render();
     });
-  }
+
+    deleteCell.appendChild(deleteButton);
+  });
 }
+