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How would I toggle an object property between true and false?

let myLibrary = [
{
id: 0,
title: "The Once and Future King",
author: "White",
pages: 654,
read: false,
},
{
id: 1,
title: "The Hobbit",
author: "Tolkien",
pages: 304,
read: false,
},
];
const bookContent = document.getElementById("content");
function displayBook(book) {
const addBook = document.createElement("div");
addBook.className = "book";
addBook.id = book.id;
bookContent.appendChild(addBook);
addBook.innerHTML = `
<div class="title">
<p class="bookTitle">
<span>${book.title}</span>
</p>
</div>
<div class="body">
<p>
Author: <span>${book.author}</span>
</p>
<p>
Pages: <span>${book.pages}</span>
</p>
</div>
<div class="read">
<label class="switch" data-book="0">
<input type="checkbox" />
<span class="slider round"></span>
</label>
</div>
<div class="delete">
<button class="delete-btn">DELETE</button>
</div>`;
}
// Display your original object list
myLibrary.forEach((book) => {
displayBook(book);
});
// Handle your object creation
const form = document.getElementById("form");
form.addEventListener("submit", updateLibrary);
function updateLibrary(event) {
// Need this so it doesn't refresh page
event.preventDefault();
const title = document.getElementById("title").value;
const author = document.getElementById("author").value;
const pages = document.getElementById("pages").value;
const book = {
title: title,
author: author,
pages: parseInt(pages),
read: false,
};
// Adds object to array
myLibrary.push(book);
// Displays new book
displayBook(book);
// Reset form
resetForm();
// Close form
document.getElementById("addBookForm").style.display = "none";
console.log(myLibrary);
}
// Resets the form so user can input another book
function resetForm() {
document.getElementById("form").reset();
}
// The form is automatically set to hidden. This loads it up for the user
const openForm = function () {
document.getElementById("addBookForm").style.display = "block";
document.getElementById("title").focus();
};
// Sets the form display back to none
const closeForm = () =>
(document.getElementById("addBookForm").style.display = "none");
/* .main {
} */
.header {
display: flex;
flex-direction: column;
background-color: #c689c6;
height: 150px;
border: 1px solid #3b133b;
}
.btn {
margin: 0 auto;
margin-top: 55px;
display: block;
text-align: center;
background-color: #4649ff;
padding: 0.75rem 1.25rem;
border-radius: 10rem;
color: #fff;
cursor: pointer;
font-size: 1rem;
letter-spacing: 0.15rem;
transition: all 0.3s;
}
.btn:hover {
background-color: #3134fa;
}
.content {
display: flex;
flex-flow: row wrap;
align-content: flex-start;
justify-content: flex-start;
background-color: #fffdfa;
height: auto;
}
.book {
border: 2px solid #ffa94d;
background-color: #ffd8a8;
color: #d9480f;
width: 280px;
height: 365px;
margin: 10px;
}
.title {
border-bottom: 2px solid #ffa94d;
}
.title p {
display: flex;
align-items: center;
text-align: center;
justify-content: center;
font-size: larger;
}
.title span {
color: #3c4048;
}
.body {
border: 1px solid transparent;
height: 200px;
background-color: #fff4e6;
}
.body p {
padding-left: 20px;
}
p span {
color: #3c4048;
}
.read {
display: flex;
align-items: center;
justify-content: center;
height: 50px;
border-top: 2px solid #ffa94d;
text-align: center;
}
/* The switch - the box around the slider */
.switch {
position: relative;
display: inline-block;
width: 60px;
height: 34px;
}
/* Hide default HTML checkbox */
.switch input {
opacity: 0;
width: 0;
height: 0;
}
/* The slider */
.slider {
position: absolute;
cursor: pointer;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: #ccc;
-webkit-transition: 0.4s;
transition: 0.4s;
}
.slider:before {
position: absolute;
content: "";
height: 26px;
width: 26px;
left: 4px;
bottom: 4px;
background-color: white;
-webkit-transition: 0.4s;
transition: 0.4s;
}
input:checked + .slider {
background-color: #3d8361;
}
input:focus + .slider {
box-shadow: 0 0 1px #3d8361;
}
input:checked + .slider:before {
-webkit-transform: translateX(26px);
-ms-transform: translateX(26px);
transform: translateX(26px);
}
/* Rounded sliders */
.slider.round {
border-radius: 34px;
}
.slider.round:before {
border-radius: 50%;
}
.delete {
height: 50px;
border-top: 2px solid #ffa94d;
}
.delete-btn {
margin: 0 auto;
margin-top: 8px;
display: block;
text-align: center;
background-color: #e94560;
padding: 0.5rem 0.75rem;
border-radius: 10rem;
color: #fff;
cursor: pointer;
letter-spacing: 0.15rem;
transition: all 0.3s;
}
.delete-btn:hover {
background-color: #e7082d;
}
.close-btn {
color: #e7082d;
font-size: large;
background-color: #c689c6;
border: none;
float: right;
cursor: pointer;
}
/* THE FORM */
.form-content {
display: flex;
justify-content: center;
}
.form {
display: none;
position: fixed;
margin-top: 5px;
border: 2px solid #3b133b;
animation: openForm 0.5s;
z-index: 1;
}
#keyframes openForm {
from {
transform: scale(0);
}
to {
transform: scale(1);
}
}
.form h1 {
text-align: center;
}
.form-container {
background-color: #c689c6;
border: 2px solid black;
max-width: 300px;
padding: 10px;
}
.form-container h1 {
padding-left: 20px;
}
.form-container input[type="text"],
.form-container input[type="number"] {
width: 80%;
padding: 15px;
margin: 5px 0 22px 0;
border: none;
}
.form-container input[type="text"]:focus,
.form-container input[type="number"]:focus {
outline: none;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="styles.css" />
<title>Library</title>
</head>
<body>
<div class="main">
<div class="header">
<button class="btn" id="btn" onclick="openForm()">Add a Book</button>
</div>
<div class="form-content">
<div class="form" id="addBookForm">
<form id="form" action="" class="form-container">
<button type="button" class="close-btn" onclick="closeForm()">
x
</button>
<h1>Add a Book</h1>
<label for="title">Title</label>
<input
type="text"
placeholder="Title"
name="title"
id="title"
required
/>
<label for="author">Author</label>
<input
type="text"
placeholder="Author"
name="author"
id="author"
required
/>
<label for="pages">Pages</label>
<input
type="number"
placeholder="Pages"
name="pages"
required
id="pages"
/>
<button type="submit" id="submit-btn">Submit</button>
</form>
</div>
</div>
<div id="content" class="content"></div>
</div>
</body>
</html>
I have a form where the user inputs information from a book they are reading and upon hitting submit, the information is sent as its own object inside an array. I also have a forEach method running which loops through the array and displays each object as a div on the web page.
let myLibrary = [];
const book = {
title: title,
author: author,
pages: parseInt(pages),
read: false,
};
myLibrary.push(book)
As you can see from the code above, the three properties that the user fills out are the books title, author and page count. There's also a property that is automatically added called the read property and it is automatically set as false.
The Problem
My problem is this. I have the following code displayed at the bottom of each div.
<div class="read">
<label class="switch">
<input type="checkbox" />
<span class="slider round"></span>
</label>
</div>
This code is very simple. It's a toggle switch which I found here.
I want it so when the toggle switch is grayed out, the read status is set to false. But when the toggle switch is turned on, the read property is set to true. I am having a very difficult time figuring out how to get this done.
What I've Tried
I was able to use an onclick to select the toggle switch's parent element, and I tested it using console.log however I am unsure of where to go from there. I attempted to update the book.read to true using the ternary operator but it was out of scope and resulted in an error.
document.querySelector(".main").onclick = (ev) => {
let el = ev.target.classList.contains("switch")
? ev.target.parentElement
: ev.target.classList.contains("slider")
? ev.target
: false;
if (el) {
let toggle = el.parentElement.parentElement.parentElement;
let index = [...toggle.parentElement.children].indexOf(toggle);
myLibrary[index].read = false ? false : true;
console.log(myLibrary[index].read);
}
console.log(myLibrary);
};

Change this
function displayBook(book) {
...
<label class="switch" data-book="0">
to
function displayBook(book,bookIndex) {
...
<label class="switch" data-book="${bookIndex}">
and
myLibrary.forEach((book) => {
displayBook(book);
});
to
myLibrary.forEach((book,i) => {
displayBook(book,i);
});
lastly change
// Displays new book
displayBook(book);
to
// Displays new book
displayBook(book,myLibrary.length-1);
Here is the code inclusive a delete function
It would be slightly simpler if we had an associate array on book_id
Note I removed the numeric ID because it is not needed since the index of the array is the same
let myLibrary = [{
title: "The Once and Future King",
author: "White",
pages: 654,
read: false,
},
{
title: "The Hobbit",
author: "Tolkien",
pages: 304,
read: false,
},
];
const bookContent = document.getElementById("content");
const formDiv = document.getElementById("addBookForm");
function displayBook(book, idx) {
const addBook = document.createElement("div");
addBook.className = "book";
addBook.id = `book_${idx}`;
bookContent.appendChild(addBook);
addBook.innerHTML = `
<div class="title">
<p class="bookTitle">
<span>${book.title}</span>
</p>
</div>
<div class="body">
<p>
Author: <span>${book.author}</span>
</p>
<p>
Pages: <span>${book.pages}</span>
</p>
</div>
<div class="read">
<label class="switch" data-book="${idx}">
<input type="checkbox" />
<span class="slider round"></span>
</label>
</div>
<div class="delete">
<button class="delete-btn">DELETE</button>
</div>`;
}
// Display your original object list
myLibrary.forEach((book, i) => {
displayBook(book, i);
});
const deleteBook = (e) => {
const parent = e.target.closest("div.book");
const idx = parent.querySelector(".switch").dataset.book;
parent.remove();
console.log(idx);
myLibrary.splice(idx, 1);
console.log(myLibrary);
content.querySelectorAll("div.book").forEach((book, i) => { // reset the hard way
book.id = `book_${i}`;
book.querySelector("label.switch").dataset.book = i;
})
};
content.addEventListener("click", function(e) {
const tgt = e.target;
if (!tgt.matches(".delete-btn")) return; // not the delete
deleteBook(e); // pass the event to the delete
})
// Handle your object creation
const form = document.getElementById("form");
form.addEventListener("submit", updateLibrary);
function updateLibrary(event) {
// Need this so it doesn't refresh page
event.preventDefault();
const title = document.getElementById("title").value;
const author = document.getElementById("author").value;
const pages = document.getElementById("pages").value;
const book = {
title: title,
author: author,
pages: parseInt(pages),
read: false,
};
// Adds object to array
myLibrary.push(book);
// Displays new book
displayBook(book);
// Reset form
resetForm();
// Close form
formDiv.style.display = "none";
console.log(myLibrary);
}
// Resets the form so user can input another book
function resetForm() {
document.getElementById("form").reset();
}
// The form is automatically set to hidden. This loads it up for the user
const openForm = function() {
formDiv.style.display = "block";
document.getElementById("title").focus();
};
// Sets the form display back to none
const closeForm = () => formDiv.style.display = "none";
/* .main {
} */
.header {
display: flex;
flex-direction: column;
background-color: #c689c6;
height: 150px;
border: 1px solid #3b133b;
}
.btn {
margin: 0 auto;
margin-top: 55px;
display: block;
text-align: center;
background-color: #4649ff;
padding: 0.75rem 1.25rem;
border-radius: 10rem;
color: #fff;
cursor: pointer;
font-size: 1rem;
letter-spacing: 0.15rem;
transition: all 0.3s;
}
.btn:hover {
background-color: #3134fa;
}
.content {
display: flex;
flex-flow: row wrap;
align-content: flex-start;
justify-content: flex-start;
background-color: #fffdfa;
height: auto;
}
.book {
border: 2px solid #ffa94d;
background-color: #ffd8a8;
color: #d9480f;
width: 280px;
height: 365px;
margin: 10px;
}
.title {
border-bottom: 2px solid #ffa94d;
}
.title p {
display: flex;
align-items: center;
text-align: center;
justify-content: center;
font-size: larger;
}
.title span {
color: #3c4048;
}
.body {
border: 1px solid transparent;
height: 200px;
background-color: #fff4e6;
}
.body p {
padding-left: 20px;
}
p span {
color: #3c4048;
}
.read {
display: flex;
align-items: center;
justify-content: center;
height: 50px;
border-top: 2px solid #ffa94d;
text-align: center;
}
/* The switch - the box around the slider */
.switch {
position: relative;
display: inline-block;
width: 60px;
height: 34px;
}
/* Hide default HTML checkbox */
.switch input {
opacity: 0;
width: 0;
height: 0;
}
/* The slider */
.slider {
position: absolute;
cursor: pointer;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: #ccc;
-webkit-transition: 0.4s;
transition: 0.4s;
}
.slider:before {
position: absolute;
content: "";
height: 26px;
width: 26px;
left: 4px;
bottom: 4px;
background-color: white;
-webkit-transition: 0.4s;
transition: 0.4s;
}
input:checked+.slider {
background-color: #3d8361;
}
input:focus+.slider {
box-shadow: 0 0 1px #3d8361;
}
input:checked+.slider:before {
-webkit-transform: translateX(26px);
-ms-transform: translateX(26px);
transform: translateX(26px);
}
/* Rounded sliders */
.slider.round {
border-radius: 34px;
}
.slider.round:before {
border-radius: 50%;
}
.delete {
height: 50px;
border-top: 2px solid #ffa94d;
}
.delete-btn {
margin: 0 auto;
margin-top: 8px;
display: block;
text-align: center;
background-color: #e94560;
padding: 0.5rem 0.75rem;
border-radius: 10rem;
color: #fff;
cursor: pointer;
letter-spacing: 0.15rem;
transition: all 0.3s;
}
.delete-btn:hover {
background-color: #e7082d;
}
.close-btn {
color: #e7082d;
font-size: large;
background-color: #c689c6;
border: none;
float: right;
cursor: pointer;
}
/* THE FORM */
.form-content {
display: flex;
justify-content: center;
}
.form {
display: none;
position: fixed;
margin-top: 5px;
border: 2px solid #3b133b;
animation: openForm 0.5s;
z-index: 1;
}
#keyframes openForm {
from {
transform: scale(0);
}
to {
transform: scale(1);
}
}
.form h1 {
text-align: center;
}
.form-container {
background-color: #c689c6;
border: 2px solid black;
max-width: 300px;
padding: 10px;
}
.form-container h1 {
padding-left: 20px;
}
.form-container input[type="text"],
.form-container input[type="number"] {
width: 80%;
padding: 15px;
margin: 5px 0 22px 0;
border: none;
}
.form-container input[type="text"]:focus,
.form-container input[type="number"]:focus {
outline: none;
}
<div class="main">
<div class="header">
<button class="btn" id="btn" onclick="openForm()">Add a Book</button>
</div>
<div class="form-content">
<div class="form" id="addBookForm">
<form id="form" action="" class="form-container">
<button type="button" class="close-btn" onclick="closeForm()">
x
</button>
<h1>Add a Book</h1>
<label for="title">Title</label>
<input type="text" placeholder="Title" name="title" id="title" required />
<label for="author">Author</label>
<input type="text" placeholder="Author" name="author" id="author" required />
<label for="pages">Pages</label>
<input type="number" placeholder="Pages" name="pages" required id="pages" />
<button type="submit" id="submit-btn">Submit</button>
</form>
</div>
</div>
<div id="content" class="content"></div>
</div>

Vanilla Javascript Modal not appearing once clicked

I am a beginner and tried to code along in a Javascript tutorial video(Beginner Projects). The problem is my modal did not pop-up once I clicked the button. The new class i've created (.open-modal) in vanilla javascript appeared in the dev tool elements the same as the close button once I unchecked the z-index: -10 and visibility: hidden. I also tried to click the close button but nothing happens. Thanks!
const modalOverlay = document.querySelector(".modal-overlay")
const modalClose = document.querySelector(".close-btn")
const modalBtn = document.querySelector('.btn-primary')
modalBtn.addEventListener("click", function() {
modalOverlay.classList.add("open-modal");
});
modalClose.addEventListener("click", function() {
modalOverlay.classList.remove("open-modal")
});
.open-modal {
visibility: visible;
z-index: 100;
}
.modal-overlay {
position: fixed;
top: 0;
left: 0;
height: 100%;
width: 100%;
display: flex;
place-items: center;
justify-content: center;
background: rgba(76, 52, 90, 0.15);
z-index: -10;
visibility: hidden;
}
.modal-container {
position: relative;
text-align: center;
background: #fff;
font-weight: 300;
border-radius: 10px;
padding: 10px;
height: 400px;
display: flex;
align-items: center;
}
<button class="btn btn-primary">OPEN</button>
</form>
</div>
</div>
</section>
<div class="modal-overlay">
<div class="container modal-container">
<h1>MODAL TEST!</h1>
<button class="close-btn"><i class="fas fa-times"></i></button>
</div>
</div>

You just have to write ".open-modal" after ".modal-container" or use "!important" end of your ".open-modal" styles to work well
const modalOverlay = document.querySelector(".modal-overlay")
const modalClose = document.querySelector(".close-btn")
const modalBtn = document.querySelector('.btn-primary')
modalBtn.addEventListener("click", function() {
modalOverlay.classList.add("open-modal");
});
modalClose.addEventListener("click", function() {
modalOverlay.classList.remove("open-modal")
});
.modal-overlay {
position: fixed;
top: 0;
left: 0;
height: 100%;
width: 100%;
display: flex;
place-items: center;
justify-content: center;
background: rgba(76, 52, 90, 0.15);
z-index: 0;
visibility: hidden;
}
.modal-container {
position: relative;
text-align: center;
background: #fff;
font-weight: 300;
border-radius: 10px;
padding: 10px;
height: 400px;
display: flex;
align-items: center;
}
.open-modal {
visibility: visible;
z-index: 100;
}
<button class="btn btn-primary">OPEN</button>
</form>
</div>
</div>
</section>
<div class="modal-overlay">
<div class="container modal-container">
<h1>MODAL TEST!</h1>
<button class="close-btn"><i class="fas fa-times"></i></button>
</div>
</div>

Scroll Snap for div that looks like an iPhone in HTML

I made this iPhone in HTML (Please do not pay attention to the spaghetti code, and it's in german, if it is necessary i can translate it with pleasure):
var time = document.getElementById("time");
var notification = document.getElementById("notification");
var notificationHeader = document.getElementById("notificationHeader");
var notificationDescription = document.getElementById("notificationDescription");
var verificationCode = Math.floor(1000 + Math.random() * 9000);
var input = document.getElementById("instagramNumberText");
var correctOrWrongCheck = document.getElementById("correctOrWrongCheck");
var verificationCodePTag = document.getElementById("verificationCode");
var instagram = document.getElementById("instagramApp");
var mail = document.getElementById("mailApp");
var createAccountButton = document.getElementById("createAccount");
var createAccountForm = document.getElementById("createAccountForm");
var verificationCodeInstagramPage = document.getElementById("verificationCodeInstagramPage");
var controlVerificationCodeButton = document.getElementById("controlVerificationCode");
var continueToInstagramAccountButton = document.getElementById("continueToInstagramAccount");
var verificationCodeEmailDescription = document.getElementById("verificationCodeEmailDescription");
var verificationCodeEmail = document.getElementById("verificationCodeEmail");
var erfolgreichAngemeldet = document.getElementById("erfolgreichAngemeldet");
var instagramAccount = document.getElementById("instagramAccount");
var instagramName = document.getElementById("instagramName");
var instagramNameInput = document.getElementById("instagramNameInput");
// Time
function checkTime(i) {
if (i < 10) {
i = "0" + i;
}
return i;
}
function startTime() {
var today = new Date();
var h = today.getHours();
var m = today.getMinutes();
// add a zero in front of numbers<10
m = checkTime(m);
document.getElementById('time').innerHTML = h + ":" + m;
t = setTimeout(function() {
startTime()
}, 500);
}
startTime();
// Insta
function controlVerificationCode() {
if (input.value == verificationCode) {
correctOrWrongCheck.innerHTML = "Der Code war korrekt!";
continueToInstagramAccountButton.style.display = "block";
continueToInstagramAccountButton.style.margin = "5px auto";
controlVerificationCodeButton.style.display = "none";
} else if (input.value !== verificationCode) {
correctOrWrongCheck.innerHTML = "Der Code ist leider Falsch!";
continueToInstagramAccountButton.style.display = "none";
controlVerificationCodeButton.style.display = "block";
}
}
verificationCodeEmailDescription.innerHTML = "Ihr Bestätigunscode lautet: " + verificationCode;
// OPEN AND CLOSE APPS
function openVerificationCodeInstagramPage() {
createAccountForm.style.display = "none";
verificationCodeInstagramPage.style.display = "block"
verificationCodeEmail.style.display = "block";
instagramName.value = instagramNameInput.value;
notification.style.transform = "translate(-50%, -50%) scale(0)";
notificationDescription.innerHTML = "Ihr Bestätigunscode lautet: ...";
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(1)";
}, 1000);
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(0)";
}, 7000);
}
function continueToInstagramAccount() {
verificationCodeInstagramPage.style.display = "none";
instagramAccount.style.display = "flex";
erfolgreichAngemeldet.display = "none";
notificationDescription.innerHTML = "Erfolgreich bei Instagram angemeldet"
notification.style.transform = "translate(-50%, -50%) scale(0)";
erfolgreichAngemeldet.style.display = "block";
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(1)";
}, 1000);
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(0)";
}, 7000);
var counter = 0;
var followers = document.getElementById('followers');
setTimeout(function(){
var st = setInterval(function(){
followers.innerHTML = ++counter;
},100)
},100);
}
function closeNotification() {
notification.style.transform = "translate(-50%, -50%) scale(0)";
}
function openInstagram() {
instagram.style.transform = "scale(1)";
}
function openMail() {
mail.style.transform = "scale(1)";
}
function closeApp() {
instagram.style.transform = "scale(0)";
mail.style.transform = "scale(0)";
}
window.onload = function() {
document.getElementById("instagramNumberText").value = '';
}
* {
margin: 0;
padding: 0;
font-family: 'Roboto',sans-serif;
user-select: none;
}
input:focus, textarea:focus {
outline: 0;
}
#phone {
height: 600px;
width: 350px;
border-radius: 50px;
position: absolute;
top: 600px;
left: 50%;
-ms-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
border-top: 90px solid;
border-right: 15px solid;
border-left: 15px solid;
border-bottom: 90px solid;
background-image: url("https://ioshacker.com/wp-content/uploads/2019/06/iOS-13-wallpaper.jpg");
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
.app {
box-shadow: 0 0 9px -4px #000;
}
#topbar {
padding: 0.3em;
color: #fff;
display: flex;
justify-content: space-between;
align-items: center;
height: 20px;
transform: translate(-4%,0) scale(0.9);
width: 370px;
}
#connection {
display: flex;
align-items: center;
width: 110px;
justify-content: space-around;
}
#battery {
display: flex;
align-items: center;
width: 110px;
justify-content: end;
}
#battery .bi-battery-full {
font-size: 23px;
margin-left: 5px;
}
#topbar .bi-wifi-2 {
font-size: 25px;
margin-top: -3px;
}
#time {
text-align: center;
}
#notification {
margin: 0;
position: absolute;
top: 365px;
left: 50%;
-ms-transform: translate(-50%, -50%) scale(0);
transform: translate(-50%, -50%) scale(0);
height: 85px;
width: 315px;
background: #EDEBED;
border-radius: 10px;
z-index: 10000;
transition: all 0.5s;
box-shadow: 0 0 10px -1px #525252;
padding: 0.5em 0 0.5em 1em;
display: flex;
flex-direction: column;
justify-content: center;
}
#notification h1 {
font-size: 23px;
}
#appsOne {
display: flex;
justify-content: space-around;
flex-wrap: wrap;
}
#instagramIcon, #verificationCode, #mailIcon {
margin: 20px;
}
.app {
font-size: 40px;
width: 50px;
height: 50px;
display: flex;
justify-content: center;
align-items: center;
border-radius: 10px;
transition: all 0.2s;
}
.app:hover {
cursor: pointer;
filter: brightness(90%);
}
.bi-instagram, .bi-envelope-fill {
width: 40px;
height: 40px;
color: #fff;
font-family: sans-serif;
}
/* Instagram */
#instagramIcon {
background: linear-gradient(45deg, #f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%);
}
#instagramApp {
position: absolute;
top: 0;
left: 0;
background: #EAEAEA;
height: 100%;
width: 100%;
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
transition: all 0.3s;
transform: scale(0);
z-index: 99999;
text-align: center;
}
.instagramHeader {
font-family: 'Handlee', cursive;
font-size: 35px;
}
.instagramSecondHeader {
font-size: 15px;
width: 260px;
margin: 1em 0;
}
#instagramNameInput, #instagramEmail, #instagramNumberText {
font-size: 15px;
padding: 0.5em;
border: 1px solid #D1D1D1;
margin: 0.5em 0 0.5em 0;
width: 220px;
}
.instagramButton {
width: 236px;
font-size: 15px;
padding: 0.5em;
background: #3296F0;
color: #fff;
border: none;
margin: 0.5em 0;
transition: all 0.2s;
}
.instagramButton:hover {
filter: brightness(80%);
cursor: pointer;
}
#verificationCodeInstagramPage {
display: none;
}
#continueToInstagramAccount {
display: none;
}
#instagramAccount {
display: none;
justify-content: flex-start;
height: 100%;
width: 100%;
background: #f7f7f7;
flex-direction: column;
align-items: center;
}
#instagramName {
font-size: 20px;
text-align: left;
width: 85%;
padding: 20px 20px 15px 10px;
border-bottom: 1px solid gray;
height: 20px;
border-right: none;
border-top: none;
border-left: none;
background: none;
}
#profilePicture {
font-size: 35px;
width: 80px;
height: 80px;
display: flex;
justify-content: center;
align-items: center;
background: #eae9e9;
border-radius: 100000px;
margin: 20px;
border: 1px solid #6f6e6e;
color: #6f6e6e;
}
#instagramPictureAndNumbers {
display: inherit;
width: 360px;
}
#numbers {
width: 225px;
height: 45px;
margin: 35px 0 0 0;
}
#userDescription {
width: 320px;
font-size: 13px;
border: none;
background: none;
resize: none;
}
.bi-table {
font-size: 25px;
border-bottom: 1px solid;
width: 90%;
margin-top: 0.5em;
}
#emptyImages {
color: #c7c7c7;
margin: 100px;
font-size: 14px;
}
/* Mail */
#mailIcon {
background: linear-gradient(0deg, #05ffff 0%, #3cabe6 30%, #2763dc 70%);
}
#mailApp {
position: absolute;
top: 0;
left: 0;
background: #f6f6f6;
height: 100%;
width: 100%;
display: flex;
align-items: center;
justify-content: flex-start;
flex-direction: column;
transition: all 0.3s;
transform: scale(0);
z-index: 99999;
text-align: center;
}
#mailHeader {
font-size: 25px;
padding: 20px;
background: #fff;
width: 88%;
z-index: 999;
}
#verificationCodeEmail {
display: none;
}
.email {
background: #fff;
width: 97%;
padding: 5px;
border-top: 1px solid #e6e6e6;
}
.emailHeader {
text-align: left;
margin: 10px;
font-size: 25px;
}
#verificationCodeEmailDescription, #erfolgreichAngemeldetDescription {
text-align: left;
margin: 10px;
}
#erfolgreichAngemeldet {
display: none;
}
/* Home Button */
#homeButton {
position: absolute;
height: 60px;
width: 60px;
background: transparent;
z-index: 9999;
bottom: -107px;
border-radius: 100000px;
left: 50%;
-ms-transform: translate(-50%, -50%) rotate(-10deg);
transform: translate(-50%, -50%) rotate(-10deg);
border: 1px outset;
cursor: pointer;
}
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons#1.4.1/font/bootstrap-icons.css">
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Roboto:wght#100;300;400&display=swap" rel="stylesheet">
<div id="notification" onclick="closeNotification();">
<h1 id="notificationHeader"><b>Neue Email erhalten!</b></h1>
<p id="notificationDescription"></p>
</div>
<div id="phone">
<div id="topbar">
<div id="connection">
<i class="bi bi-bar-chart-fill"></i>
LIDL LTE
<i class="bi bi-wifi-2"></i>
</div>
<p id="time"></p>
<div id="battery">
98%
<i class="bi bi-battery-full"></i>
</div>
</div>
<div id="slider">
<div id="appsOne">
<!-- Instagram -->
<div id="instagramIcon" class="app" onclick="openInstagram();"><i class="bi bi-instagram"></i></div>
<div id="instagramApp">
<form id="createAccountForm" action="#" onsubmit="openVerificationCodeInstagramPage(); return false;">
<h1 class="instagramHeader">Instagram</h1>
<p>Erstelle einen Account</p>
<input type="text" id="instagramNameInput" placeholder="Name" maxlength="12" autocomplete="off" required>
<input type="email" id="instagramEmail" placeholder="E-Mail" autocomplete="off" required>
<button type="submit" id="createAccount" class="instagramButton">Erstellen</button>
</form>
<div id="verificationCodeInstagramPage">
<h1 class="instagramHeader">Bestätigen</h1>
<p class="instagramSecondHeader">Wir haben ihn einen Bestätigungscode per Email gesendet!</p>
<input type="text" id="instagramNumberText" maxlength="4" onkeypress="return /[0-9]/i.test(event.key)" placeholder="Bestätigungscode"><br>
<button onclick="controlVerificationCode();" id="controlVerificationCode" class="instagramButton">Bestätigen</button>
<button class="instagramButton" id="continueToInstagramAccount" onclick="continueToInstagramAccount()">Weiter</button>
<p id="correctOrWrongCheck"></p>
</div>
<div id="instagramAccount">
<input type="text" id="instagramName">
<div id="instagramPictureAndNumbers">
<div id="profilePicture"><i class="bi bi-person-fill"></i></div>
<table id="numbers">
<tr>
<th id="posts">0</th>
<th id="followers">1</th>
<th id="following">0</th>
</tr>
<tr>
<td>Posts</td>
<td>Followers</td>
<td>Following</td>
</tr>
</table>
</div>
<textarea id="userDescription" placeholder="Beschreibung..." rows="10"></textarea>
<i class="bi bi-table"></i>
<p id="emptyImages">No images found</p>
</div>
</div>
<div id="appsTwo">
Second App Page
</div>
</div>
<!-- Mail App -->
<div id="mailIcon" class="app" onclick="openMail();"><i class="bi bi-envelope-fill"></i></div>
<div id="mailApp">
<h1 id="mailHeader">E-Mails</h1>
<div class="email" id="erfolgreichAngemeldet">
<h1 class="emailHeader">Instagram</h1>
<p class="emailDescription" id="erfolgreichAngemeldetDescription">Erfolgreich angemeldet</p>
</div>
<div class="email" id="verificationCodeEmail">
<h1 class="emailHeader">Instagram</h1>
<p class="emailDescription" id="verificationCodeEmailDescription">Ihr Bestätigunscode lautet</p>
</div>
</div>
</div>
<div id="homeButton" onclick="closeApp();"></div>
To see the iPhone better you should click on Full-Page in the snippet.
My problem was that I have 2 divs: #appsOne and #appsTwo which are in the div #slider. On the home page of the iPhone you can see two apps (#appsOne) and a text (#appsTwo) in the middle. The apps (#appsOne) should stay where they are but the text (#appsTwo) should be made on a second page with a horizontal scroll snap. How could I do that?
And here's an image, how it looks like without the slider and the #appsTwo div:

CSS Scroll-snapping
We can seperate the two 'screen's by wrapping each in a div with class panel.
To make the slider scrollable, we have to apply white-space: nowrap to force it into a single line. To make scroll-snap work horizontally, set scroll-snap-type to x and make it mandatory (scroll-snap-type: x mandatory;). This means that:
The visual viewport of this scroll container will rest on a snap point if it isn't currently scrolled. That means it snaps on that point when the scroll action finished, if possible. If content is added, moved, deleted or resized the scroll offset will be adjusted to maintain the resting on that snap point.MDN
We also set overscroll-behavior-x to contain which makes sure that no scroll chaining occurs to neighboring scrolling areas, e.g. underlying elements will not scroll.
We then apply scroll-snap-align: center to .panel. To prevent the overflowing contents in the panels, we also apply white-space: initial.
Result:
https://jsfiddle.net/Spectric/j7br8h5a/
JS Scroll-snapping (mouse drag)
We can take it one step further by adding support for user drag to scroll.
For this, we don't actually need scroll-snap at all. We can do it with pure JS.
Add an event listener for mousedown that sets isDown to true. Record the last position of the mouse.
Add an event listener for mousemove that checks whether the user is currently dragging (isDown == true). If the user is, calculate the distance from the current mouse position and the last mouse position, increment the slider's scrollLeft by the difference, and set the last position to the current position.
Add an event listener for mouseup that sets isDown to false and checks whether the slider's current scrollLeft is bigger than half. If it is, we can use scrollIntoView() on one panel to smoothly scroll it into the viewport.
To prevent scrolling when an app is opened, we can store the status in a variable which we set it to true when one of the open app function is called and false when the closeApp function is called. In the mousemove listener we also check whether this variable is true.
Best viewed in full-page mode
var time = document.getElementById("time");
var notification = document.getElementById("notification");
var notificationHeader = document.getElementById("notificationHeader");
var notificationDescription = document.getElementById("notificationDescription");
var verificationCode = Math.floor(1000 + Math.random() * 9000);
var input = document.getElementById("instagramNumberText");
var correctOrWrongCheck = document.getElementById("correctOrWrongCheck");
var verificationCodePTag = document.getElementById("verificationCode");
var instagram = document.getElementById("instagramApp");
var mail = document.getElementById("mailApp");
var createAccountButton = document.getElementById("createAccount");
var createAccountForm = document.getElementById("createAccountForm");
var verificationCodeInstagramPage = document.getElementById("verificationCodeInstagramPage");
var controlVerificationCodeButton = document.getElementById("controlVerificationCode");
var continueToInstagramAccountButton = document.getElementById("continueToInstagramAccount");
var verificationCodeEmailDescription = document.getElementById("verificationCodeEmailDescription");
var verificationCodeEmail = document.getElementById("verificationCodeEmail");
var erfolgreichAngemeldet = document.getElementById("erfolgreichAngemeldet");
var instagramAccount = document.getElementById("instagramAccount");
var instagramName = document.getElementById("instagramName");
var instagramNameInput = document.getElementById("instagramNameInput");
// Time
function checkTime(i) {
if (i < 10) {
i = "0" + i;
}
return i;
}
function startTime() {
var today = new Date();
var h = today.getHours();
var m = today.getMinutes();
// add a zero in front of numbers<10
m = checkTime(m);
document.getElementById('time').innerHTML = h + ":" + m;
t = setTimeout(function() {
startTime()
}, 500);
}
startTime();
// Insta
function controlVerificationCode() {
if (input.value == verificationCode) {
correctOrWrongCheck.innerHTML = "Der Code war korrekt!";
continueToInstagramAccountButton.style.display = "block";
continueToInstagramAccountButton.style.margin = "5px auto";
controlVerificationCodeButton.style.display = "none";
} else if (input.value !== verificationCode) {
correctOrWrongCheck.innerHTML = "Der Code ist leider Falsch!";
continueToInstagramAccountButton.style.display = "none";
controlVerificationCodeButton.style.display = "block";
}
}
verificationCodeEmailDescription.innerHTML = "Ihr Bestätigunscode lautet: " + verificationCode;
// OPEN AND CLOSE APPS
function openVerificationCodeInstagramPage() {
createAccountForm.style.display = "none";
verificationCodeInstagramPage.style.display = "block"
verificationCodeEmail.style.display = "block";
instagramName.value = instagramNameInput.value;
notification.style.transform = "translate(-50%, -50%) scale(0)";
notificationDescription.innerHTML = "Ihr Bestätigunscode lautet: ...";
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(1)";
}, 1000);
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(0)";
}, 7000);
}
function continueToInstagramAccount() {
verificationCodeInstagramPage.style.display = "none";
instagramAccount.style.display = "flex";
erfolgreichAngemeldet.display = "none";
notificationDescription.innerHTML = "Erfolgreich bei Instagram angemeldet"
notification.style.transform = "translate(-50%, -50%) scale(0)";
erfolgreichAngemeldet.style.display = "block";
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(1)";
}, 1000);
setTimeout(
function() {
notification.style.transform = "translate(-50%, -50%) scale(0)";
}, 7000);
var counter = 0;
var followers = document.getElementById('followers');
setTimeout(function() {
var st = setInterval(function() {
followers.innerHTML = ++counter;
}, 100)
}, 100);
}
function closeNotification() {
notification.style.transform = "translate(-50%, -50%) scale(0)";
}
var isAppOpened = false;
function openInstagram() {
isAppOpened = true;
instagram.style.transform = "scale(1)";
}
function openMail() {
isAppOpened = true;
mail.style.transform = "scale(1)";
}
function closeApp() {
isAppOpened = false;
instagram.style.transform = "scale(0)";
mail.style.transform = "scale(0)";
}
window.onload = function() {
document.getElementById("instagramNumberText").value = '';
}
const slider = document.getElementById("slider");
const panels = document.querySelectorAll('.panel');
var lastX = 0;
var isDown = false;
document.addEventListener("mousedown", function(e) {
lastX = e.pageX;
isDown = true;
})
document.addEventListener("mousemove", function(e) {
if (isDown && !isAppOpened) {
const curX = e.pageX;
const diff = lastX - curX;
slider.scrollLeft += diff;
lastX = curX;
}
})
document.addEventListener("mouseup", function() {
isDown = false;
slider.style.scrollBehavior = "smooth";
if (slider.scrollLeft > 175) {
panels[1].scrollIntoView();
} else {
panels[0].scrollIntoView();
}
slider.style.scrollBehavior = "unset";
})
* {
margin: 0;
padding: 0;
font-family: 'Roboto', sans-serif;
user-select: none;
}
input:focus,
textarea:focus {
outline: 0;
}
#phone {
height: 600px;
width: 350px;
border-radius: 50px;
position: absolute;
top: 600px;
left: 50%;
-ms-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
border-top: 90px solid;
border-right: 15px solid;
border-left: 15px solid;
border-bottom: 90px solid;
background-image: url("https://ioshacker.com/wp-content/uploads/2019/06/iOS-13-wallpaper.jpg");
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
.app {
box-shadow: 0 0 9px -4px #000;
}
#topbar {
padding: 0.3em;
color: #fff;
display: flex;
justify-content: space-between;
align-items: center;
height: 20px;
transform: translate(-4%, 0) scale(0.9);
width: 370px;
}
#connection {
display: flex;
align-items: center;
width: 110px;
justify-content: space-around;
}
#battery {
display: flex;
align-items: center;
width: 110px;
justify-content: end;
}
#battery .bi-battery-full {
font-size: 23px;
margin-left: 5px;
}
#topbar .bi-wifi-2 {
font-size: 25px;
margin-top: -3px;
}
#time {
text-align: center;
}
#notification {
margin: 0;
position: absolute;
top: 365px;
left: 50%;
-ms-transform: translate(-50%, -50%) scale(0);
transform: translate(-50%, -50%) scale(0);
height: 85px;
width: 315px;
background: #EDEBED;
border-radius: 10px;
z-index: 10000;
transition: all 0.5s;
box-shadow: 0 0 10px -1px #525252;
padding: 0.5em 0 0.5em 1em;
display: flex;
flex-direction: column;
justify-content: center;
}
#notification h1 {
font-size: 23px;
}
#appsOne {
display: flex;
justify-content: space-around;
flex-wrap: wrap;
}
#instagramIcon,
#verificationCode,
#mailIcon {
margin: 20px;
}
.app {
font-size: 40px;
width: 50px;
height: 50px;
display: flex;
justify-content: center;
align-items: center;
border-radius: 10px;
transition: all 0.2s;
}
.app:hover {
cursor: pointer;
filter: brightness(90%);
}
.bi-instagram,
.bi-envelope-fill {
width: 40px;
height: 40px;
color: #fff;
font-family: sans-serif;
}
/* Instagram */
#instagramIcon {
background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}
#instagramApp {
position: absolute;
top: 0;
left: 0;
background: #EAEAEA;
height: 100%;
width: 100%;
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
transition: all 0.3s;
transform: scale(0);
z-index: 99999;
text-align: center;
}
.instagramHeader {
font-family: 'Handlee', cursive;
font-size: 35px;
}
.instagramSecondHeader {
font-size: 15px;
width: 260px;
margin: 1em 0;
}
#instagramNameInput,
#instagramEmail,
#instagramNumberText {
font-size: 15px;
padding: 0.5em;
border: 1px solid #D1D1D1;
margin: 0.5em 0 0.5em 0;
width: 220px;
}
.instagramButton {
width: 236px;
font-size: 15px;
padding: 0.5em;
background: #3296F0;
color: #fff;
border: none;
margin: 0.5em 0;
transition: all 0.2s;
}
.instagramButton:hover {
filter: brightness(80%);
cursor: pointer;
}
#verificationCodeInstagramPage {
display: none;
}
#continueToInstagramAccount {
display: none;
}
#instagramAccount {
display: none;
justify-content: flex-start;
height: 100%;
width: 100%;
background: #f7f7f7;
flex-direction: column;
align-items: center;
}
#instagramName {
font-size: 20px;
text-align: left;
width: 85%;
padding: 20px 20px 15px 10px;
border-bottom: 1px solid gray;
height: 20px;
border-right: none;
border-top: none;
border-left: none;
background: none;
}
#profilePicture {
font-size: 35px;
width: 80px;
height: 80px;
display: flex;
justify-content: center;
align-items: center;
background: #eae9e9;
border-radius: 100000px;
margin: 20px;
border: 1px solid #6f6e6e;
color: #6f6e6e;
}
#instagramPictureAndNumbers {
display: inherit;
width: 360px;
}
#numbers {
width: 225px;
height: 45px;
margin: 35px 0 0 0;
}
#userDescription {
width: 320px;
font-size: 13px;
border: none;
background: none;
resize: none;
}
.bi-table {
font-size: 25px;
border-bottom: 1px solid;
width: 90%;
margin-top: 0.5em;
}
#emptyImages {
color: #c7c7c7;
margin: 100px;
font-size: 14px;
}
/* Mail */
#mailIcon {
background: linear-gradient(0deg, #05ffff 0%, #3cabe6 30%, #2763dc 70%);
}
#mailApp {
position: absolute;
top: 0;
left: 0;
background: #f6f6f6;
height: 100%;
width: 100%;
display: flex;
align-items: center;
justify-content: flex-start;
flex-direction: column;
transition: all 0.3s;
transform: scale(0);
z-index: 99999;
text-align: center;
}
#mailHeader {
font-size: 25px;
padding: 20px;
background: #fff;
width: 88%;
z-index: 999;
}
#verificationCodeEmail {
display: none;
}
.email {
background: #fff;
width: 97%;
padding: 5px;
border-top: 1px solid #e6e6e6;
}
.emailHeader {
text-align: left;
margin: 10px;
font-size: 25px;
}
#verificationCodeEmailDescription,
#erfolgreichAngemeldetDescription {
text-align: left;
margin: 10px;
}
#erfolgreichAngemeldet {
display: none;
}
/* Home Button */
#homeButton {
position: absolute;
height: 60px;
width: 60px;
background: transparent;
z-index: 9999;
bottom: -107px;
border-radius: 100000px;
left: 50%;
-ms-transform: translate(-50%, -50%) rotate(-10deg);
transform: translate(-50%, -50%) rotate(-10deg);
border: 1px outset;
cursor: pointer;
}
#slider {
white-space: nowrap;
position: relative;
overflow-x: scroll;
overflow-y: hidden;
-webkit-overflow-scrolling: touch;
height: calc(100% - 30px);
}
.panel {
display: inline-block;
width: 350px;
white-space: initial;
}
#appsTwo {
display: flex;
justify-content: space-around;
flex-wrap: wrap;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons#1.4.1/font/bootstrap-icons.css">
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Roboto:wght#100;300;400&display=swap" rel="stylesheet">
</head>
<body>
<div id="notification" onclick="closeNotification();">
<h1 id="notificationHeader"><b>Neue Email erhalten!</b></h1>
<p id="notificationDescription"></p>
</div>
<div id="phone">
<div id="topbar">
<div id="connection">
<i class="bi bi-bar-chart-fill"></i> LIDL LTE
<i class="bi bi-wifi-2"></i>
</div>
<p id="time"></p>
<div id="battery">
98%
<i class="bi bi-battery-full"></i>
</div>
</div>
<div id="slider">
<div class="panel">
<div id="appsOne">
<!-- Instagram -->
<div id="instagramIcon" class="app" onclick="openInstagram();"><i class="bi bi-instagram"></i></div>
<div id="instagramApp">
<form id="createAccountForm" action="#" onsubmit="openVerificationCodeInstagramPage(); return false;">
<h1 class="instagramHeader">Instagram</h1>
<p>Erstelle einen Account</p>
<input type="text" id="instagramNameInput" placeholder="Name" maxlength="12" autocomplete="off" required>
<input type="email" id="instagramEmail" placeholder="E-Mail" autocomplete="off" required>
<button type="submit" id="createAccount" class="instagramButton">Erstellen</button>
</form>
<div id="verificationCodeInstagramPage">
<h1 class="instagramHeader">Bestätigen</h1>
<p class="instagramSecondHeader">Wir haben ihn einen Bestätigungscode per Email gesendet!
</p>
<input type="text" id="instagramNumberText" maxlength="4" onkeypress="return /[0-9]/i.test(event.key)" placeholder="Bestätigungscode"><br>
<button onclick="controlVerificationCode();" id="controlVerificationCode" class="instagramButton">Bestätigen</button>
<button class="instagramButton" id="continueToInstagramAccount" onclick="continueToInstagramAccount()">Weiter</button>
<p id="correctOrWrongCheck"></p>
</div>
<div id="instagramAccount">
<input type="text" id="instagramName">
<div id="instagramPictureAndNumbers">
<div id="profilePicture"><i class="bi bi-person-fill"></i></div>
<table id="numbers">
<tr>
<th id="posts">0</th>
<th id="followers">1</th>
<th id="following">0</th>
</tr>
<tr>
<td>Posts</td>
<td>Followers</td>
<td>Following</td>
</tr>
</table>
</div>
<textarea id="userDescription" placeholder="Beschreibung..." rows="10"></textarea>
<i class="bi bi-table"></i>
<p id="emptyImages">No images found</p>
</div>
</div>
<div id="mailIcon" class="app" onclick="openMail();"><i class="bi bi-envelope-fill"></i></div>
<div id="mailApp">
<h1 id="mailHeader">E-Mails</h1>
<div class="email" id="erfolgreichAngemeldet">
<h1 class="emailHeader">Instagram</h1>
<p class="emailDescription" id="erfolgreichAngemeldetDescription">Erfolgreich angemeldet</p>
</div>
<div class="email" id="verificationCodeEmail">
<h1 class="emailHeader">Instagram</h1>
<p class="emailDescription" id="verificationCodeEmailDescription">Ihr Bestätigunscode lautet
</p>
</div>
</div>
</div>
</div>
<div class="panel">
<div id="appsTwo">
<div>
Second App Page
</div>
</div>
</div>
</div>
<div id="homeButton" onclick="closeApp();"></div>
</div>
</body>
</html>
Result:
You can hide the horizontal scrollbar by applying overflow-x:hidden to #slider

Add and remove class if input is empty

I've a problem with adding and removing a class when input is empty.
Code also available on JSFiddle.
var name = document.getElementById("name").value;
var lastname = document.getElementById("lastname").value;
var underlineFocus = document.getElementsByClassName("underline-focus");
function changeUnderline() {
if (name === "") {
underlineFocus[0].classList.add("underline-focus-empty");
} else {
underlineFocus[0].classList.remove("underline-focus-empty");
}
if (lastname === "") {
underlineFocus[1].classList.add("underline-focus-empty");
} else {
underlineFocus[1].classList.remove("underline-focus-empty");
}
}
changeUnderline();
form {
justify-content: flex-start;
align-content: flex-start;
align-items: flex-start;
}
input {
width: 100%;
height: 24px;
font-size: 14px;
background: none;
border: none;
outline: none;
}
.underline {
width: 100%;
height: 1px;
margin-bottom: 18px;
background-color: #1a2c5b;
position: relative;
top: -3px;
}
.underline-focus {
width: 0;
height: 3px;
background-color: #7971ea;
transition: width .3s ease-in-out;
z-index: 10;
}
input:focus+.underline-focus {
width: 100%;
}
.underline-empty,
.underline-focus-empty {
background-color: #f95959;
}
<form>
<label for="name">Name *</label>
<input type="text" name="name" id="name" onchange="changeUnderline();" required>
<div class="underline-focus"></div>
<div class="underline"></div>
<label for="lastname">Last Name *</label>
<input type="text" name="lastname" id="lastname" onchange="changeUnderline();" required>
<div class="underline-focus"></div>
<div class="underline"></div>
</form>
I've already looked at other questions and can't find the answer.

2 major errors in your code.
1) by using <form> each enter send your data to nowhere and refresh all input to null
2) you can't use the word "name" for a variable.
var X_name = document.getElementById("name");
var underlineFocus = document.getElementsByClassName("underline-focus");
function changeUnderline() {
if (X_name.value === "") {
underlineFocus[0].classList.add("underline-focus-empty");
} else {
underlineFocus[0].classList.remove("underline-focus-empty");
}
}
changeUnderline();
form {
justify-content: flex-start;
align-content: flex-start;
align-items: flex-start;
}
input {
width: 100%;
height: 24px;
font-size: 14px;
background: none;
border: none;
outline: none;
}
.underline {
width: 100%;
height: 1px;
margin-bottom: 18px;
background-color: #1a2c5b;
position: relative;
top: -3px;
}
.underline-focus {
width: 0;
height: 3px;
background-color: #7971ea;
transition: width .3s ease-in-out;
z-index: 10;
}
input:focus+.underline-focus {
width: 100%;
}
.underline-empty,
.underline-focus-empty {
background-color: #f95959;
}
<!--form -->
<label for="name">Name *</label>
<input type="text" name="name" id="name" onchange="changeUnderline();" required>
<div class="underline-focus"></div>
<div class="underline"></div>
<!--/form -->

Popup used to display on webpage, but no longer does

I did have a popup on one of my webpages that used to display when I clicked a link but, while not knowing what's changed, It appears to have stopped displaying when I click the link. When using 'Inspect Element' using Chrome, the correct elements have the attribute 'display: block !important;' so should display.
Here is the code snippet:
function popup() {
var popup = document.getElementById("popup")
var popupLayer = document.getElementById("popup-layer")
popup.classList.toggle("show")
popupLayer.classList.toggle("show")
}
html, body {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.click {
cursor: pointer;
}
.popup {
background-color: white;
height: 70%;
width: 70%;
display: none;
position: relative;
border: 1px solid;
padding: 20px;
z-index: 2;
align-self: center;
}
.popup-wrapper {
height: 100%;
width: 100%;
visibility: hidden;
display: none;
position: absolute;
display: flex;
justify-content: center;
}
.show {
display: block !important;
}
.popup-layer {
background-color: gray;
opacity: 0.3;
position: absolute;
height: 100%;
width: 100%;
margin-top: -20px;
z-index: 1;
display: none;
}
#page-1 {
background-color: #b3d9ff;
height: 100vh;
width: 100%;
}
<div id="page-1">
<div id="popup-wrapper" class="popup-wrapper">
<div id="popup" class="popup center">
<a class="click" onclick="popup()">Click me!</a>
</div>
</div>
<a class="click" onclick="popup()">Click me!</a>
<div id="popup-layer" class="popup-layer">
</div>
</div>

This is really a debugging question which is supposed to be done by you or at the least told us what you think it is.
Anyway, in .popup-wrapper I took out height as I presume it was spanning out of the view.
function popup() {
var popup = document.getElementById("popup");
var popupLayer = document.getElementById("popup-layer");
popup.classList.toggle("show");
popupLayer.classList.toggle("show");
}
html, body {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.click {
cursor: pointer;
}
.popup {
background-color: red;
height: 70%;
width: 70%;
display: none;
position: relative;
border: 1px solid;
padding: 20px;
z-index: 2;
align-self: center;
}
.popup-wrapper {
width: 100%;
display: none;
position: absolute;
display: flex;
justify-content: center;
}
.show {
display: block !important;
}
.popup-layer {
background-color: gray;
opacity: 0.3;
position: absolute;
height: 100%;
width: 100%;
margin-top: -20px;
z-index: 1;
display: none;
}
#page-1 {
background-color: #b3d9ff;
height: 100vh;
width: 100%;
}
<div id="page-1">
<div id="popup-wrapper" class="popup-wrapper">
<div id="popup" class="popup center">
<a class="click" onclick="popup()">Click me!</a>
</div>
</div>
<a class="click" onclick="popup()">Click me!</a>
<div id="popup-layer" class="popup-layer"></div>
</div>

yes thats popup-wrapper that is origin of the problem. But seing that you put your events in the a element its prefered to use this code to prevent the redirection or use button instead of this
var popupDiv = document.getElementById("popup");
var popupLayer = document.getElementById("popup-layer");
var clickMe=document.querySelectorAll(".click");
function popup() {
popupDiv.classList.toggle("show");
popupLayer.classList.toggle("show");
}
clickMe.forEach(function(elem){
elem.addEventListener('click',function(e){
e.preventDefault();
popup()},false);
});

CSS thus change this part
.popup-wrapper {
height: 50%;
width: 100%;
display: none;
position: absolute;
display: flex;
z-index: 0;
justify-content: center;
}
JS for the best way
var popupDiv = document.getElementById("popup");
var popupLayer = document.getElementById("popup-layer");
var clickMe=document.querySelectorAll(".click");
function popup() {
popupDiv.classList.toggle("show");
popupLayer.classList.toggle("show");
}
clickMe.forEach(function(elem){
elem.addEventListener('click',function(e){
e.preventDefault();
popup()},false);
});