JavaScript popup with delay

JavaScript popup with delay - javascript

What am I doing wrong here? A simple (test) div. I want it to pop up automatically with a delay.
<div id="myModal">
<span class="close">×</span>
<p style="font-size: 20px; text-align: center;">My Modal</p>
</div>
<script>
function MyTest() {
document.getElementById("myModal").style.display = "block";
setTimeout(myModal, 3000);
}
var close = document.getElementsByClassName("close") [0];
close.onclick = function() {
myModal.style.display = "none";
}
</script>

Move document.getElementById("myModal").style.display = "block"; inside setTimeOut.
<div id="myModal">
<span class="close">×</span>
<p style="font-size: 20px; text-align: center;">My Modal</p>
</div>
<script>
function MyTest() {
document.getElementById("myModal").style.display = "none";
setTimeout(function() {
document.getElementById("myModal").style.display = "block";
}, 3000);
}
MyTest();
var close = document.getElementsByClassName("close") [0];
close.onclick = function() {
myModal.style.display = "none";
}
</script>

Related

Toggle buttons between each other in jQuery

I'm trying to make a container with 4 buttons in it and I wan't to toggle them between each other. Currently toggle is works when I double click the button (1click - show, 2click -hide) But when I click another button with toggle option the button shows information about another one.
How i can make button toggle when i click another button but not the same one.
<div class="newsFeedButtons">
<button class="btn" id="searchbtn" onclick="searchFeed()">Search</button>
<button class="btn" id="cryptobtn" onclick="cryptoFeed()">Crypto</button>
<button class="btn" onclick="twitterFeed()">Twitter</button>
</div>
<div id="twitterDIV" style="display: none;">
<a class="twitter-timeline" data-width="550" data-
height="400" href="https://twitter.com/Bitcoin?
ref_src=twsrc%5Etfw">Tweets by Bitcoin</a>
<script async
src="https://platform.twitter.com/widgets.js" charset="utf-8">.
</script>
</div>
<div class="row">
<div id="newsResult"></div>
</div>
JavaScript code:
function twitterFeed() {
var x = document.getElementById("twitterDIV");
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
$(function() {
$("form").submit(function() {
return false;
});
});
function searchFeed() {
var x = document.getElementById("newsResult");
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
$(function() {
$("form").submit(function() {
return false;
});
});

A kind of simple toggling you can use on other elements, too:
function showContent() {
$('[data-show]').each(function(e) {
var thisButton = $(this);
var thisTarget = $( thisButton.data('show') );
thisTarget.toggleClass('active', thisButton.hasClass('active'));
});
};
showContent();
$('[data-show]').on('click', function(e) {
e.preventDefault();
var thisButton = $(this);
thisButton.siblings().removeClass('active');
thisButton.addClass('active');
showContent();
});
.newsFeedButtons .active {
border-color: red;
}
.newsFeedContent > div {
display: none;
}
.newsFeedContent > div.active {
display: block;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="newsFeedButtons">
<button class="btn active" data-show="#searchDiv">Search</button>
<button class="btn" data-show="#cryptoDIV">Crypto</button>
<button class="btn" data-show="#twitterDIV">Twitter</button>
</div>
<div class="newsFeedContent">
<div id="searchDiv">Search...</div>
<div id="cryptoDIV">Crypto...</div>
<div id="twitterDIV">Twitter...</div>
</div>
Also on JSFiddle

Explanation
Everytime when you click a button it display a particular div to block.
But when you click other button previous div style remains display:block
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="newsFeedButtons">
<button class="btn" id="searchbtn" onclick="searchFeed()">Search</button>
<button class="btn" id="cryptobtn" onclick="cryptoFeed()">Crypto</button>
<button class="btn" id="twitterbtn" onclick="twitterFeed()">Twitter</button>
</div>
<div id="twitterDIV" style="display: none;">
<a class="twitter-timeline" data-width="550" data-
height="400" href="https://twitter.com/Bitcoin?
ref_src=twsrc%5Etfw">Tweets by Bitcoin</a>
</div>
<div class="row">
<div id="newsResult" style="display:none">News result div</div>
</div>
<div class="row">
<div id="cryptoDIV" style="display:none">Crypto div</div>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
<script>
function twitterFeed() {
var x = document.getElementById("twitterDIV");
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
document.getElementById("newsResult").style="display:none";
document.getElementById("cryptoDIV").style="display:none";
}
$(function() {
$("form").submit(function() {
return false;
});
});
function searchFeed() {
var x = document.getElementById("newsResult");
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
document.getElementById("twitterDIV").style="display:none";
document.getElementById("cryptoDIV").style="display:none";
}
function cryptoFeed() {
var x = document.getElementById("cryptoDIV");
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
document.getElementById("twitterDIV").style="display:none";
document.getElementById("newsResult").style="display:none";
}
$(function() {
$("form").submit(function() {
return false;
});
});
</script>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
</body>
</html>

show/hide div using javascript

I have two divs, one is hidden and the other one is visible. I'm using css display:none; to hide first and using style.display="block";
when I refresh the page it gives same div name in the address bar but the div is hidden.
I just want the div to stay block after refreshing or submitting the form inside the div
<html>
<head>
<meta charset="utf-8">
<title>Sample</title>
<style>
#content {
flex:8;
display:flex;
flex-direction:row;
justify-content:space-between;
flex-basis:100%;
padding:0 10px 0x 10px;
text-align:center;
}
#leftnav {
flex:1;
padding-top:20px;
}
#midcontent {
flex:9;
text-align:center;
padding-top:20px;
display:block;
}
#leftnav ul {
display: block;
margin: 0px;
padding: 0px;
list-style-type: none;
}
#m1,#m2,#m3 {
flex:9;
text-align:center;
padding-top:20px;
display:none;
}
</style>
</head>
<body>
<div id="content">
<div id="leftnav" align="center">
<ul>
<li>Page m1</li>
<li>Page m2</li>
<li>Page m3</li>
</ul>
</div>
<div id="midcontent" align="center">
<p>Home Page</p>
</div>
<div id="m1" align="center">
<p>Div m1</p>
</div>
<div id="m2" align="center">
<p>Div m2</p>
</div>
<div id="m3" align="center">
<p>Div m3</p>
</div>
</div>
<script type="text/javascript">
var d=document.getElementById('midcontent');
var d1=document.getElementById('m1');
var d2=document.getElementById('m2');
var d3=document.getElementById('m3');
function div1() {
if(d.style.display === "block") {
d.style.display = "none";
d1.style.display = "block";
} else {
d.style.display = "none";
d1.style.display = "block";
d2.style.display = "none";
d3.style.display = "none";
}
}
function div2() {
if(d.style.display === "block") {
d.style.display = "none";
d2.style.display = "block";
} else {
d.style.display = "none";
d1.style.display = "none";
d2.style.display = "block";
d3.style.display = "none";
}
}
function div3() {
if(d.style.display === "block") {
d.style.display = "none";
d3.style.display = "block";
} else {
d.style.display = "none";
d1.style.display = "none";
d2.style.display = "none";
d3.style.display = "block";
}
}
</script>
</body>
</html>

change:
function div1() {
var d=document.getElementById('midcontent');
var d1=document.getElementById('m1');
if(d.style.display === "block") {
d.style.display = "none";
d1.style.display = "block";
} else {
d.style.display = "none";
d1.style.display = "block";
}
}
to:
function toggleDiv() {
document.getElementById('midcontent').style.display = "none";
document.getElementById('m1').style.display = "block";
}
"i just want the div to stay block after refreshing" call the function on page load in html to make it execute after refresh of page:
<body onLoad="toggleDiv()">
<!-- Your html content -->
</body>
alternatively you can also do it in js:
document.addEventListener("DOMContentLoaded", function(event) {
// Your code to run since DOM is loaded and ready
toggleDiv()
});
If you want more in depth persistance and/or variable changes please provide additional information on how and why you want to do this exactly! Hope it helps! :)

how to have only the active button staying open?

I have come up with this not very nice solution for having 7 buttons and information appearing in a div. However I would like the open div to close when a new button is clicked. also my solution is very repetition.
javascript code ...lengthy solution for accessing each div with each button...working separately
function myRoot() {
var x = document.getElementById("root");
if (x.style.display !== "block") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
function mySacral() {
var x = document.getElementById("sacral");
if (x.style.display !== "block") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
function mySolar() {
var x = document.getElementById("solar");
if (x.style.display !== "block") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
function myHeart() {
var x = document.getElementById("heart");
if (x.style.display !== "block") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
function myThroat() {
var x = document.getElementById("throat");
if (x.style.display !== "block") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
function myBrow() {
var x = document.getElementById("brow");
if (x.style.display !== "block") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
function myCrown() {
var x = document.getElementById("crown");
if (x.style.display !== "block") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
<script src="Myscript.js"></script>
<div class="chakra">
<button class="chbtn" onclick="myRoot()"><img src="Images/root.png"></button>
</div>
<div class="chakra">
<button class="chbtn" onclick="mySacral()"><img src="Images/sacral.png"></button>
</div>
<div class="chakra">
<button class="chbtn" onclick="mySolar()"><img src="Images/solar.png"></button>
</div>
<div class="chakra">
<button class="chbtn" onclick="myHeart()"><img src="Images/heart.png"></button>
</div>
<div class="chakra">
<button class="chbtn" onclick="myThroat()"><img src="Images/throat.png"></button>
</div>
<div class="chakra">
<button class="chbtn" onclick="myBrow()"><img src="Images/brow.png"></button>
</div>
<div class="chakra">
<button class="chbtn" onclick="myCrown()"><img src="Images/crown.png"></button>
</div>
</div>
<div class="pic-holder">
<h3>Chakra information</h3>
<div class="info" id="root"><img src="Images/root.png"> The root Chakra</br>
<p>Lorem </p>
<p>Lorem ipsum, dolor sit </p>
</div>
<div class="info" id="sacral"><img src="Images/sacral.png"> The sacral Chakra</br>
<p>Lorem blah blahipsum blah blah</p>
</div>

so.. here is a simple code to show how to proceed, with a small css part
var
Elm_Id_Block = '',
elms_xx = document.querySelectorAll('#elmsGroup > div')
;
// init
elms_xx[0].style.display = "block";
Elm_Id_Block = elms_xx[0].id;
document.querySelector("#buttonsGroup").onclick = function (e) {
if (!e.target.matches('button')) return;
e.stopPropagation();
let ref = e.target.dataset.ref;
if (ref != Elm_Id_Block) {
document.getElementById(ref).style.display = "block";
document.getElementById(Elm_Id_Block).style.display = "none";
Elm_Id_Block = ref;
}
}
#elmsGroup>div {
display: none;
width: 300px;
height: 30px;
padding: 5px;
border: 1px solid lightblue;
margin: 5px;
}
<div id="buttonsGroup">
<button data-ref="elm-A">A</button>
<button data-ref="elm-B">B</button>
<button data-ref="elm-C">C</button>
<button data-ref="elm-D">D</button>
<button data-ref="elm-E">E</button>
</div>
<div id="elmsGroup">
<div id="elm-A"> elm-A </div>
<div id="elm-B"> elm-B </div>
<div id="elm-C"> elm-C </div>
<div id="elm-D"> elm-D </div>
<div id="elm-E"> elm-E </div>
</div>

Text doesn't appear when outputting it on HTML

I've been working on a notebook web app, my problem is that if I write a note and save it, when I press on its title to read it again it just shows me an empty screen. Here is the code for the app:
const main = document.getElementById("main");
const add = document.getElementById("add"); //new note
const submit = document.getElementById("submit"); //submit the new note
const cancel = document.getElementById("cancel");
const screen = document.getElementById("screen");
const ul = document.getElementById("list");
const del = document.getElementById("delete");
const note = document.getElementById("note");
const back = document.getElementById("back");
const noteTitle = document.getElementById("note-title");
const inputTitle = document.getElementById("input-title");
const err1 = document.getElementById("err1");
const err2 = document.getElementById("err2");
const err3 = document.getElementById("err3");
const text = document.getElementById("text");
let flag1 = false;
let flag2 = false;
let flag3 = false;
let mynotes = {};
let i = 1;
add.addEventListener('click', function(){
main.style.display = "block";
submit.style.display = "inline";
cancel.style.display = "inline";
add.style.display = "none";
screen.style.display = "none";
del.style.display = "none";
back.style.display = "none";
inputTitle.style.display = "block"
});
submit.addEventListener('click', function(){
title = noteTitle.value;
newNote = note.value;
if (title.length < 3){
err1.style.display = "block";
flag1 = true;
} else {
err1.style.display = "none";
flag1 = false
}
if (newNote === ""){
err2.style.display = "block";
flag2 = true;
} else {
err2.style.display = "none";
flag2 = false;
}
if (mynotes.hasOwnProperty(title)){
err3.style.display = "block";
flag3 = true;
} else {
err3.style.display = "none";
flag3 = false;
}
if (!flag1 && !flag2 && !flag3) {
newNote = newNote.replace(/\n/g, "<br>");
mynotes[title] = newNote;
var li = document.createElement("li");
li.setAttribute('class','item');
li.appendChild(document.createTextNode(title));
ul.appendChild(li);
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
cancel.style.display = "none";
add.style.display = "inline";
del.style.display = "none";
back.style.display = "none";
inputTitle.style.display = "none";
note.value = "";
noteTitle.value = "";
}
});
ul.addEventListener('click', function(event){
node = event.target;
item = event.target.textContent;
text.innerHTML = mynotes[item];
fullnote.style.display = "block";
main.style.display = "none";
submit.style.display = "none";
add.style.display = "none";
screen.style.display = "none";
cancel.style.display = "none";
del.style.display = "inline";
back.style.display = "inline";
inputTitle.style.display = "none";
});
del.addEventListener('click', function(){
ul.removeChild(node);
delete mynotes[item];
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
back.style.display = "none";
del.style.display = "none";
inputTitle.style.display = "none";
});
cancel.addEventListener('click', function(){
note.value = "";
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
del.style.display = "none";
back.style.display = "none";
cancel.style.display = "none";
inputTitle.style.display = "none";
});
back.addEventListener('click', function(){
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
back.style.display = "none";
del.style.display = "none";
inputTitle.style.display = "none";
});
#container {
background-color: rgb(253, 248, 177);
}
#header, #footer {
z-index: 2;
width: 100%;
position: fixed;
}
#footer {
bottom: 0;
}
#screen, #input-title {
margin-top: 2em;
}
#title {
color: white;
padding-top: 7px;
}
#cancel, #submit, #back {
color: white;
font-size: 20px;
}
#add {
font-size: 20px;
}
#delete, #cancel, #submit {
display: none;
}
#input-title {
display: none;
}
#main {
display: none;
}
#note {
resize: none;
}
#fullnote {
display: none;
}
#back {
display: none;
}
#err1 {
color: red;
font-size: 12px;
font-weight: bold;
display: none;
}
#err2 {
color: red;
font-size: 12px;
font-weight: bold;
display: none;
}
#err3 {
color: red;
font-size: 12px;
font-weight: bold;
display: none;
}
<!doctype html>
<html lang="en">
<head>
<!-- link to css -->
<link rel="stylesheet" href="style.css">
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
<title>Notebook</title>
</head>
<body>
<div class="container min-vh-100 d-flex flex-column" id="container">
<!-- header -->
<div class="row align-items-start bg-info container" id="header">
<div class="col text-center">
<button type="button" class="btn" id="cancel">✗</button>
<button type="button" class="btn" id="back">↩</button>
</div>
<div class="col text-center">
<h4 id="title">Notebook</h4>
</div>
<div class="col text-center">
<button type="button" class="btn" id="submit">✔</button>
</div>
</div>
<br />
<!-- Screen list show -->
<div class="row" id="screen">
<div class="col-12">
<ul id="list">
</ul>
</div>
</div>
<!-- Note show -->
<div class="row" id="fullnote">
<div class="col-12">
<p id="text">
</p>
</div>
</div>
<!-- input for note title -->
<div class="row" id="input-title">
<div class="col">
<input type="text" maxlength="20" class="form-control" placeholder="Note title" value="" id="note-title">
<p id="err1">Title must be at least 3 characters</p>
<p id="err3">There is a note with this title</p>
</div>
</div>
<br />
<!-- textarea for writing note -->
<div class="row flex-grow-1">
<div class="col" id="main">
<textarea class="form-control textarea h-100" value="" placeholder="write note" id="note"></textarea>
<p id="err2">Note can not be empty</p>
</div>
</div>
<br />
<!-- footer -->
<div class="row align-items-end container" id="footer">
<div class="col d-flex justify-content-start" style="padding: 10px; padding-left: 25px;">
<button id="add" class="btn btn-info rounded-circle"><h4 style="padding: 0px; margin: 0px;">+</h4></button>
<button id="delete" class="btn btn-info rounded-circle">🗑</button>
</div>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
Steps to recreate the issue:
Try to add a note, save it, and press on it's title to read the note and you'll understand what I mean.

The problem was in your <p id="text"> tag. It was hidden behind the blue header. Just used a couple of <br> and it is visible now.
const main = document.getElementById("main");
const add = document.getElementById("add"); //new note
const submit = document.getElementById("submit"); //submit the new note
const cancel = document.getElementById("cancel");
const screen = document.getElementById("screen");
const ul = document.getElementById("list");
const del = document.getElementById("delete");
const note = document.getElementById("note");
const back = document.getElementById("back");
const noteTitle = document.getElementById("note-title");
const inputTitle = document.getElementById("input-title");
const err1 = document.getElementById("err1");
const err2 = document.getElementById("err2");
const err3 = document.getElementById("err3");
const text = document.getElementById("text");
let flag1 = false;
let flag2 = false;
let flag3 = false;
let mynotes = {};
let i = 1;
add.addEventListener('click', function(){
main.style.display = "block";
submit.style.display = "inline";
cancel.style.display = "inline";
add.style.display = "none";
screen.style.display = "none";
del.style.display = "none";
back.style.display = "none";
inputTitle.style.display = "block"
});
submit.addEventListener('click', function(){
title = noteTitle.value;
newNote = note.value;
if (title.length < 3){
err1.style.display = "block";
flag1 = true;
} else {
err1.style.display = "none";
flag1 = false
}
if (newNote === ""){
err2.style.display = "block";
flag2 = true;
} else {
err2.style.display = "none";
flag2 = false;
}
if (mynotes.hasOwnProperty(title)){
err3.style.display = "block";
flag3 = true;
} else {
err3.style.display = "none";
flag3 = false;
}
if (!flag1 && !flag2 && !flag3) {
newNote = newNote.replace(/\n/g, "<br>");
mynotes[title] = newNote;
var li = document.createElement("li");
li.setAttribute('class','item');
li.appendChild(document.createTextNode(title));
ul.appendChild(li);
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
cancel.style.display = "none";
add.style.display = "inline";
del.style.display = "none";
back.style.display = "none";
inputTitle.style.display = "none";
note.value = "";
noteTitle.value = "";
}
});
ul.addEventListener('click', function(event){
node = event.target;
item = event.target.textContent;
console.log(mynotes[item])
text.innerHTML = mynotes[item];
fullnote.style.display = "block";
main.style.display = "none";
submit.style.display = "none";
add.style.display = "none";
screen.style.display = "none";
cancel.style.display = "none";
del.style.display = "inline";
back.style.display = "inline";
inputTitle.style.display = "none";
});
del.addEventListener('click', function(){
ul.removeChild(node);
delete mynotes[item];
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
back.style.display = "none";
del.style.display = "none";
inputTitle.style.display = "none";
});
cancel.addEventListener('click', function(){
note.value = "";
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
del.style.display = "none";
back.style.display = "none";
cancel.style.display = "none";
inputTitle.style.display = "none";
});
back.addEventListener('click', function(){
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
back.style.display = "none";
del.style.display = "none";
inputTitle.style.display = "none";
});
#container {
background-color: rgb(253, 248, 177);
}
#header, #footer {
z-index: 2;
width: 100%;
position: fixed;
}
#footer {
bottom: 0;
}
#screen, #input-title {
margin-top: 2em;
}
#title {
color: white;
padding-top: 7px;
}
#cancel, #submit, #back {
color: white;
font-size: 20px;
}
#add {
font-size: 20px;
}
#delete, #cancel, #submit {
display: none;
}
#input-title {
display: none;
}
#main {
display: none;
}
#note {
resize: none;
}
#fullnote {
display: none;
}
#back {
display: none;
}
#err1 {
color: red;
font-size: 12px;
font-weight: bold;
display: none;
}
#err2 {
color: red;
font-size: 12px;
font-weight: bold;
display: none;
}
#err3 {
color: red;
font-size: 12px;
font-weight: bold;
display: none;
}
<!doctype html>
<html lang="en">
<head>
<!-- link to css -->
<link rel="stylesheet" href="style.css">
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
<title>Notebook</title>
</head>
<body>
<div class="container min-vh-100 d-flex flex-column" id="container">
<!-- header -->
<div class="row align-items-start bg-info container" id="header">
<div class="col text-center">
<button type="button" class="btn" id="cancel">✗</button>
<button type="button" class="btn" id="back">↩</button>
</div>
<div class="col text-center">
<h4 id="title">Notebook</h4>
</div>
<div class="col text-center">
<button type="button" class="btn" id="submit">✔</button>
</div>
</div>
<br />
<!-- Screen list show -->
<div class="row" id="screen">
<div class="col-12">
<ul id="list">
</ul>
</div>
</div>
<!-- Note show -->
<div class="row" id="fullnote">
<div class="col-12">
<br><br>
<p id="text">
</p>
</div>
</div>
<!-- input for note title -->
<div class="row" id="input-title">
<div class="col">
<input type="text" maxlength="20" class="form-control" placeholder="Note title" value="" id="note-title">
<p id="err1">Title must be at least 3 characters</p>
<p id="err3">There is a note with this title</p>
</div>
</div>
<br />
<!-- textarea for writing note -->
<div class="row flex-grow-1">
<div class="col" id="main">
<textarea class="form-control textarea h-100" value="" placeholder="write note" id="note"></textarea>
<p id="err2">Note can not be empty</p>
</div>
</div>
<br />
<!-- footer -->
<div class="row align-items-end container" id="footer">
<div class="col d-flex justify-content-start" style="padding: 10px; padding-left: 25px;">
<button id="add" class="btn btn-info rounded-circle"><h4 style="padding: 0px; margin: 0px;">+</h4></button>
<button id="delete" class="btn btn-info rounded-circle">🗑</button>
</div>
</div>
</div>
<script src="script.js"></script>
</body>
</html>

The problem is that the note text is under the header.
Add some margin to the note text section
#fullnote {
margin-top: 50px;
}

It's actually working exactly as you expect. The problem isn't that the full text of the note isn't being displayed, it is that your fullnote element has not been pushed down (margin-top, most likely), placing it directly behind the #header div.
I would suggest strongly that you use the Chrome Developer Tools (or if you're on another platform, their dev tools). It will allow you to see if there are javascript errors, and also to poke around in the DOM structure itself. By doing this, I could see the #fullnote, and that it did, in fact, contain the text of the note as you'd wanted.

The fullnote element is actually hidden by green bar
Change CSS to
#fullnote {
margin-top: 25px;
display: none;
}

textarea value property ignore the linebreaks and whitespaces when read it with javascript

I've been working on a small notebook app that works on the browser, my problem is that if i typed a note like this:
*hello
this is my first note
the app show it like this:
hello this is my first note
I also want the elements with id's of header and footer to be shown even when i scroll down or up (sth like setting posiotion to fixed but this doesn't work for me).
here is a link to the project to see the codes and try it. Codepen

you have to replace linebreaks and whitespaces with html like
note.value.replace(/\n/g, '<br>\n').replace(/\s/g,' ');
and add it to the innerHTML of the <li> instead of creating a textnode.
li.innerHTML = show;
Take a look at my example:
const main = document.getElementById("main");
const add = document.getElementById("add"); //new note
const submit = document.getElementById("submit"); //submit the new note
const cancel = document.getElementById("cancel");
const screen = document.getElementById("screen");
const ul = document.getElementById("list");
const del = document.getElementById("delete");
const note = document.getElementById("note");
const back = document.getElementById("back");
let mynotes = {};
let i = 0;
add.addEventListener('click', function() {
main.style.display = "block";
submit.style.display = "inline";
cancel.style.display = "inline";
add.style.display = "none";
screen.style.display = "none";
del.style.display = "none";
back.style.display = "none";
});
submit.addEventListener('click', function() {
if (note.value) {
newNote = note.value.replace(/\n/g, '<br>\n').replace(/\s/g,' ');
if (newNote.length > 50) {
show = newNote.substring(0, 46) + "...";
} else {
show = newNote;
}
if (mynotes.hasOwnProperty(show)) {
show = show + `${++i}`;
}
mynotes[show] = newNote;
var li = document.createElement("li");
li.setAttribute('class', 'item');
li.innerHTML = show;
ul.appendChild(li);
note.value = "";
} else {
alert("can't add empty note");
}
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
cancel.style.display = "none";
add.style.display = "inline";
del.style.display = "none";
back.style.display = "none";
});
ul.addEventListener('click', function(event) {
node = event.target;
item = event.target.innerHTML;
text.innerHTML = mynotes[item];
fullnote.style.display = "block";
main.style.display = "none";
submit.style.display = "none";
add.style.display = "none";
screen.style.display = "none";
cancel.style.display = "none";
del.style.display = "inline";
back.style.display = "inline";
});
del.addEventListener('click', function() {
ul.removeChild(node);
delete mynotes[item];
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
back.style.display = "none";
del.style.display = "none";
});
cancel.addEventListener('click', function() {
note.value = "";
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
del.style.display = "none";
back.style.display = "none";
cancel.style.display = "none";
})
back.addEventListener('click', function() {
main.style.display = "none";
screen.style.display = "block";
submit.style.display = "none";
add.style.display = "inline";
fullnote.style.display = "none";
back.style.display = "none";
del.style.display = "none";
});
#container {
background-color: rgb(253, 248, 177);
}
#header,
#footer {
z-index: 2;
}
#title {
color: white;
padding-top: 7px;
}
#cancel,
#submit,
#back {
color: white;
font-size: 20px;
}
#add {
font-size: 20px;
}
#delete,
#cancel,
#submit {
display: none;
}
#main {
display: none;
}
#note {
resize: none;
}
#fullnote {
display: none;
}
#back {
display: none;
}
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
<div class="container min-vh-100 d-flex flex-column" id="container">
<!-- header -->
<div class="row align-items-start bg-info" id="header">
<div class="col text-center">
<button type="button" class="btn" id="cancel">✗</button>
<button type="button" class="btn" id="back">↩</button>
</div>
<div class="col text-center">
<h4 id="title">Notebook</h4>
</div>
<div class="col text-center">
<button type="button" class="btn" id="submit">✔</button>
</div>
</div>
<br />
<!-- Screen list show -->
<div class="row" id="screen">
<div class="col-12">
<ul id="list">
</ul>
</div>
</div>
<!-- Note show -->
<div class="row" id="fullnote">
<div class="col-12">
<p id="text">
</p>
</div>
</div>
<!-- textarea -->
<div class="row flex-grow-1">
<div class="col" id="main">
<textarea class="form-control textarea h-100" value="" placeholder="write note" id="note"></textarea>
</div>
</div>
<!-- footer -->
<div class="row align-items-end" id="footer">
<div class="col d-flex justify-content-start" style="padding: 10px; padding-left: 25px;">
<button id="add" class="btn btn-info rounded-circle"><h4 style="padding: 0px; margin: 0px;">+</h4></button>
<button id="delete" class="btn btn-info rounded-circle">🗑</button>
</div>
</div>
</div>

You either have to convert the newlines to br's:
str = str.replace(/(?:\r\n|\r|\n)/g, '<br>');
Or you can do this with css:
.text, .item {
white-space: pre-wrap;
}

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