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GLASGOW | DATA FLOWS | AIDA ZHUKOVA | BOOK LIBRARY #202

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GLASGOW | DATA FLOWS | AIDA ZHUKOVA | BOOK LIBRARY #202

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469c440
all bugs have been fixed
aidazhukova Apr 16, 2025
e3e0407
addressed Pr comments
aidazhukova Apr 17, 2025
e3cfc5f
changes validation
aidazhukova Apr 18, 2025
a82e70d
check if number is integer
aidazhukova Apr 18, 2025
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26 changes: 15 additions & 11 deletions debugging/book-library/script.js
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@cjyuan cjyuan Apr 17, 2025

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  • Lines 79, 97:

    • Are the values assigned to these id attributes unique?
    • Is there any need to assign an id attribute to either buttons?

  • Line 73:

    • With the way the book's title is assigned to an HTML element, a book with a title containing special character sequence such as <i> can possibly ruin the display.

  • Can you think of a more consistent way to name the variables representing the two buttons, changeBut and delButton?

Original file line number Diff line number Diff line change
Expand Up @@ -31,14 +31,16 @@ function submit() {
if (
title.value == null ||
title.value == "" ||
pages.value == null ||
pages.value == ""
pages.value == null ||
pages.value == "" ||
author.value == null ||
author.value == ""
) {
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@cjyuan cjyuan Apr 17, 2025

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In terms of input validation,

  1. Can .value be null? (Do we need to check someInputElement.value == null?)
  2. Do you accept books to appear in the app as shown in this pic:
    image

alert("Please fill all fields!");
return false;
} else {
let book = new Book(title.value, title.value, pages.value, check.checked);
library.push(book);
let book = new Book(title.value, author.value, pages.value, check.checked);
myLibrary.push(book);
render();
}
}
Expand All @@ -53,8 +55,10 @@ function Book(title, author, pages, check) {
function render() {
let table = document.getElementById("display");
let rowsNumber = table.rows.length;
console.log(myLibrary)
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@cjyuan cjyuan Apr 17, 2025

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If this is for debugging/testing purpose, we should remove it from the "final product".


//delete old table
for (let n = rowsNumber - 1; n > 0; n-- {
for (let n = rowsNumber - 1; n > 0; n--) {
table.deleteRow(n);
}
Comment on lines +61 to 63
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@cjyuan cjyuan Apr 17, 2025

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Instead of deleting the table rows one by one, can you think of a more efficient way to remove all rows (except the <th>...</th>) in the table?

//insert updated row and cells
Expand All @@ -76,7 +80,7 @@ function render() {
changeBut.className = "btn btn-success";
wasReadCell.appendChild(changeBut);
let readStatus = "";
if (myLibrary[i].check == false) {
if (myLibrary[i].check == true) {
readStatus = "Yes";
} else {
readStatus = "No";
Expand All @@ -90,11 +94,11 @@ function render() {

//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 () {
delButton.id = i + 5;
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);
render();
Expand Down