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script.js
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script.js
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// DOM elements
var newBookBtn = document.querySelector('#new-book-btn');
var newBookForm = document.querySelector('#new-book-form');
var newBookTitle = document.querySelector('#new-book-title');
var newBookAuthor = document.querySelector('#new-book-author');
var newBookYear = document.querySelector('#new-book-year');
var newBookIsbn = document.querySelector('#new-book-isbn');
var newBookCategory = document.querySelector('#new-book-category');
var addBookBtn = document.querySelector('#add-book-btn');
var bookList = document.querySelector('#book-list');
var errorMessageDiv = document.querySelector('#error-message');
// regex to match ISBN-10 and ISBN-13
var isbnRegex = /((978[\--– ])?[0-9][0-9\--– ]{10}[\--– ][0-9xX])|((978)?[0-9]{9}[0-9Xx])/;
// Book() constructor function
function Book(title, author, year, category, isbn) {
this.title = title;
this.author = author;
this.year = year;
this.category = category;
this.isbn = isbn;
}
// first time page is loaded
if (localStorage.getItem('books') != null) {
showBookList();
}
// display book list
function showBookList() {
// fetch data from localStorage
var books = JSON.parse(localStorage.getItem('books'));
// the data is an array of book objects
for (var i = 0; i < books.length; i++) {
createListItem(books[i]);
}
}
// toggle the form display
newBookBtn.addEventListener('click', function() {
if (newBookForm.style.display === 'block') {
newBookForm.style.display = 'none';
newBookBtn.textContent = 'New book';
newBookBtn.setAttribute('class', 'generic-button');
resetForm();
} else {
newBookForm.style.display = 'block';
newBookBtn.textContent = 'Cancel';
newBookBtn.setAttribute('class', 'generic-button-red');
resetForm();
}
});
// validate form and save the book
addBookBtn.addEventListener('click', function(e) {
var errorMessage = '';
var invalidFields = '';
if (newBookTitle.value === '') {
invalidFields += '<p>Title is missing!</p>';
}
if (newBookAuthor.value === '') {
invalidFields += '<p>Author is missing!</p>';
}
if (newBookYear.value === '') {
invalidFields += '<p>Year is missing!</p>';
} else if (newBookYear.value != '' && isNaN(newBookYear.value)) {
invalidFields += '<p>Year is not a number!</p>';
} else if (newBookYear.value != '' && !isNaN(newBookYear.value) && (newBookYear.value < 1900 || newBookYear.value > 2018)) {
invalidFields += '<p>Invalid year value!</p>';
}
if (newBookIsbn.value === '') {
invalidFields += '<p>ISBN is missing!</p>';
} else if (newBookIsbn.value != '' && !isbnRegex.test(newBookIsbn.value)) {
invalidFields += '<p>Invalid ISBN!</p>';
}
if (newBookCategory.value === '') {
invalidFields += '<p>Category is missing!</p>';
}
// update error messages
if (invalidFields != '') {
errorMessage += invalidFields;
}
// if all fields are OK
if (errorMessage === '') {
// save new book
saveBook();
// and hide the form
newBookForm.style.display = 'none';
newBookBtn.textContent = 'New book';
newBookBtn.setAttribute('class', 'generic-button');
} else {
// or display the errors
errorMessageDiv.innerHTML = errorMessage;
}
// prevent form submit
e.preventDefault();
});
// create new book object and save it to localStorage
function saveBook() {
// get values from form elements
var title = newBookTitle.value;
var author = newBookAuthor.value;
var year = newBookYear.value;
var category = newBookCategory.options[newBookCategory.selectedIndex].text;
var isbn = newBookIsbn.value;
// create the new book object with those values
var newBook = new Book(title, author, year, category, isbn);
// check if the localStorage has a books data
if (localStorage.getItem('books') === null) {
// if not, create one
var books = [];
// and add the new book object to it
books.push(newBook);
localStorage.setItem('books', JSON.stringify(books));
} else {
// otherwise, add the new book object to the existing data
var books = JSON.parse(localStorage.getItem('books'));
books.push(newBook);
localStorage.setItem('books', JSON.stringify(books));
}
// add the new book object to the book list too
createListItem(newBook);
}
// format every item of the book list
function createListItem(book) {
// a single item contains div1 and ul
var listItem = document.createElement('li');
listItem.setAttribute('class', 'book-item');
// div1 contains p and div2
var div1 = document.createElement('div');
div1.setAttribute('class', 'book-item-content clearfix');
var p = document.createElement('p');
p.setAttribute('class', 'book-item-text');
p.textContent = book.author + ', ';
var it = document.createElement('i');
it.textContent = book.title;
// div2 contains button1 and button2
var div2 = document.createElement('div');
div2.setAttribute('class', 'book-item-buttons');
// more info button
var button1 = document.createElement('button');
button1.setAttribute('class', 'show-details-btn');
button1.textContent = 'i';
// remove book button
var button2 = document.createElement('button');
button2.setAttribute('class', 'delete-item-btn');
button2.textContent = 'X';
// list with more information about a specific book
var ul = document.createElement('ul');
ul.setAttribute('class', 'book-item-details');
ul.style.display= 'none';
var li1 = document.createElement('li');
li1.innerHTML = '<b>Year: </b>' + book.year;
var li2 = document.createElement('li');
li2.innerHTML = '<b>Category: </b>' + book.category;
var li3 = document.createElement('li');
li3.innerHTML = '<b>ISBN: </b>' + book.isbn;
div2.appendChild(button1);
div2.appendChild(button2);
p.appendChild(it);
div1.appendChild(p);
div1.appendChild(div2);
ul.appendChild(li1);
ul.appendChild(li2);
ul.appendChild(li3);
listItem.appendChild(div1);
listItem.appendChild(ul);
// last book added is on top of the list
bookList.insertBefore(listItem, bookList.firstChild);
// toggles ul info panel
button1.onclick = function() {
if (ul.style.display === 'none') {
ul.style.display = 'block';
} else {
ul.style.display = 'none';
}
}
// remove book from list and from localStorage
button2.onclick = function() {
bookList.removeChild(listItem);
removeBook(book);
}
}
// remove book from localStorage
function removeBook(book) {
// fetch data from localStorage
var books = JSON.parse(localStorage.getItem('books'));
// if there is only 1 book
if (books.length === 1) {
// empty the localStorage
localStorage.removeItem('books');
} else {
for (var i = 0; i < books.length; i++) {
// delete the choosed one otherwise
if (books[i].isbn === book.isbn) {
books.splice(i, 1);
// and update the data on the localStorage
localStorage.setItem('books', JSON.stringify(books));
}
}
}
}
// resetting form values
function resetForm() {
newBookTitle.value = '';
newBookAuthor.value = '';
newBookYear.value = '';
newBookIsbn.value = '';
newBookCategory.value = '';
errorMessageDiv.textContent = '';
}