London | 26-ITP-May | Chun Yan Wong | Sprint 2 | Book library

debugging/book-library/script.js

@@ -8,15 +8,13 @@ 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 book2 = new Book("The Old Man and the Sea","Ernest Hemingway",127,true);
+
+// Changed by Chun Yan Wong
+// 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);
   }
 }
 
@@ -29,17 +27,22 @@ const check = document.getElementById("check");
 //via Book function and start render function
 function submit() {
   if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
+    title.value.trim() === "" ||
+    pages.value.trim() === "" ||
+    author.value.trim() === ""
   ) {
     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;
+  } 
+
+
+  // Changed by Chun Yan Wong
+  // 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 book = new Book(title.value, author.value, pages.value, check.checked);
+  mylibrary.push(book);
+  render();
   }
 }
 
@@ -54,50 +57,55 @@ 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);
+  while (table.rows.length > 1) {
+    table.deleteRow(1);
   }
-  //insert updated row and cells
-  let length = myLibrary.length;
-  for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
+
+  // Changed by Chun Yan Wong
+  // 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 () {
+    // Changed by Chun Yan Wong
+    // 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 () {
+    // Changed by Chun Yan Wong
+    // 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", () => {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();
     });
+    deleteCell.appendChild(delButton);
   }
 }