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changing the content of a div

I would like to change the content of a div. I have three divs:
<div
class="box1"
style="height: 200px; width: 200px; background-color: red"
>
A
</div>
<br />
<div
class="box2"
style="height: 200px; width: 200px; background-color: blue"
>
<label for="">tex</label>
<input type="text" />
</div>
<br />
<div
class="box3"
style="height: 200px; width: 200px; background-color: yellow"
>
C
</div>
when the page is ready the 2 and 3rd box displays none:
function hideElementBoxOnLoad() {
let box1 = document.querySelector(".box1");
let box2 = document.querySelector(".box2");
let box3 = document.querySelector(".box3");
box2.style.display = "none";
box3.style.display = "none";
}
$(document).ready(hideElementBoxOnLoad);
I want a click that toggles the content of box2 and box3 into box1 and then back to box1 content:
function changeContent() {
let chang = true;
let box1 = document.querySelector(".box1");
let box2 = document.querySelector(".box2");
let box3 = document.querySelector(".box3");
let box2Content = box2.textContent;
let box3Content = box3.textContent;
if (chang) {
box1.textContent = box2Content;
chang = !chang;
if ((box1.textContent === box2Content)) {
box1.textContent = box3Content;
}
}
}
let btn = document.getElementById("btn");
btn.addEventListener("click", changeContent);
So far it worked but it does not display the content of box2 only box3. what did i do wrong and what better way can i toggle with a boolean.

See below
Instead of trying to swap content between each div just use JS to go through the array of them and swap an active class between them;
var boxes = document.getElementsByClassName('box');
var change = document.getElementById('change');
var counter = 0;
change.addEventListener('click', function(){
boxes[counter].classList.remove('active');
boxes[counter].nextElementSibling.classList.add('active');
counter++;
if(counter === boxes.length) {
counter = 0;
boxes[0].classList.add('active');
}
});
.box {
display: none;
width: 100px;
height: 100px;
background-color: gray;
}
.box.active {
display:block
}
<div class="box active">A</div>
<div class="box">B</div>
<div class="box">C</div>
<button id="change">Change Content</button>

im not completely sure if i understood ur question.
but below u can see and even test with the snippet button.
the button now add what ever content in in the yellow box, and whats in the input field of the blue box into the red box. listing them downwards.
if you want to replace the content completely.
just change the logic to box1.innerHTML += spacer+box3.innerHTML+spacer+input.value
this is the most simple way to do it thats easy to understand just by reading the code i think.
hope this helps!
function changeContent() {
//the button
const btn = document.getElementById("btn");
//the boxes
const box1 = document.getElementById("box1");
const box2 = document.getElementById("box2");
const box3 = document.getElementById("box3");
//a spacer
const spacer = "<br>";
//the input field
const input = document.getElementById("input");
//logic
box1.innerHTML += spacer+box3.innerHTML+spacer+input.value
}
div{
border-radius: 5px;
text-align: center;
font-family: sans-serif;
}
#box1{
min-height: 200px;
width: 200px;
padding: 5px;
background-color: rgb(255, 73, 73);
}
#box2 {
height: 200px;
width: 200px;
padding: 5px;
background-color: rgb(0, 195, 255);
}
#box3 {
height: 200px;
width: 200px;
padding: 5px;
background-color: yellow;
}
button{
padding: 3px;
margin-top: 10px;
}
<div id="box1">
<p>contetnt A</p>
</div>
<br />
<div id="box2" >
<label for="">tex</label>
<input id="input" type="text" />
<button id="btn" onclick="changeContent()">click me</button>
</div>
<br />
<div id="box3">
contetnt C
</div>

List of bugs :-
You had declared the var chang locally instead of globally, which make it true whenever you runs the function.
You are directly writing value from one tag to another, which causing the data loss, when you run your function second time.
For example :- When you click the button first time, the data is swapped, but for the second click, the data first div is lost and cannot be brought back...
Solution :- Store the data in an array in document.ready event handler and extract data from the array to update you html tags.
function hideElementBoxOnLoad() {
let box1 = document.querySelector(".box1");
let box2 = document.querySelector(".box2");
let box3 = document.querySelector(".box3");
box2.style.display = "none";
box3.style.display = "none";
content = [box1.textContent, box2.textContent, box3.textContent];
let btn = document.getElementById("btn");
btn.addEventListener("click", changeContent);
}
var content = [];
window.onload = (hideElementBoxOnLoad);
var index = 0;
function changeContent() {
let chang = true;
let box1 = document.querySelector(".box1");
/* let box2 = document.querySelector(".box2");
let box3 = document.querySelector(".box3");
let box2Content = box2.textContent;
let box3Content = box3.textContent;
if (chang) {
box1.textContent = box2Content;
chang = !chang;
if ((box1.textContent === box2Content)) {
box1.textContent = box3Content;
}
}
*/
function cycle(n, x = 0, y = content.length - 1, a = 1) {
n += a;
if (n > y) return x;
if (n < x) return y;
return n;
}
index = cycle(index);
box1.textContent = content[index];
}
<div class="box1" style="height: 200px; width: 200px; background-color: red">
A
</div>
<br />
<div class="box2" style="height: 200px; width: 200px; background-color: blue">
<label for="">tex</label>
<input type="text" />
</div>
<br />
<div class="box3" style="height: 200px; width: 200px; background-color: yellow">
C
</div>
<button id="btn"> CLICK ME </button>
Explaination
Here I first stored the tags textContent in a array content, in the starting of the code.
Then, inside the button click handler, a simple cycle function to cycle on the values stored inside the content array.

Creating new object instances and pushing them to an array in plain Javascript [duplicate]

This question already has answers here:
JavaScript code to stop form submission
(14 answers)
Closed 2 years ago.
I'm trying to create a form that when submitted, creates a new object with the input values, and then stores that object in an array.
For some reason, the array is "resetting" and not saving the objects.
let myLibrary = []
function Book(title,author,pages,read) {
this.title = title
this.author = author
this.pages = pages
this.read = read
myLibrary.push(this)
}
function checkForm(){
let name = document.querySelector('input[name="title"]').value
let author = document.querySelector('input[name="author"]').value
let pages = document.querySelector('input[name="pages"]').value
let read = document.querySelector('input[name="read"]').checked
new Book(name,author,pages,read)
document.getElementById('library').innerText = JSON.stringify(myLibrary)
}
const submit = document.getElementById('btn1')
submit.addEventListener("click",checkForm);
<input name='title' />
<input name='author' />
<input name='pages' />
<input name='read' />
<button id='btn1'>Click me! </button>
<div >Library:</div>
<div id='library'></div>

You are listening for a click event on the submit button, however the submit button also submits the form. Forms will naturally cause a refresh if the default "submit" event is not prevented.
Instead you could listen to your forms submit event and prevent it:
// Query select the form and
form.addEventListener('submit', function(e){
e.preventDefault();
checkForm();
});

As you have a form in your html, you'll have to prevent its default submission event which results in a reload of the page with preventDefault(). You could, for example, change your checkForm() and add the e.preventDefault() there to prevent the form from being submitted.
let myLibrary = []
function Book(title, author, pages, read) {
this.title = title
this.author = author
this.pages = pages
this.read = read
}
function addtoLibrary(title, author, pages, read) {
let book = new Book(title, author, pages, read)
myLibrary.push(book)
}
let table = document.querySelector(".table");
myLibrary.forEach(function(e) {
table.innerHTML += `<tr><td>${e.title}</td>
<td>${e.author}</td>
<td>${e.pages}</td>
<td>${e.read}</td>
</tr>
`
});
// Selectors
let add = document.querySelector("#add")
let submit = document.querySelector("#submit")
function checkForm(e) {
e.preventDefault(); // prevent the form from being submitted
let name = document.querySelector('input[name="title"]').value
let author = document.querySelector('input[name="author"]').value
let pages = document.querySelector('input[name="pages"]').value
let read = document.querySelector('input[name="read"]').checked
addtoLibrary(name, author, pages, read)
console.log(myLibrary);
}
submit.addEventListener("click", checkForm);
html,
body {
height: 100%;
}
* {
font-family: Graphik Regular;
}
ul {
list-style-type: none;
}
table,
th,
td {
border-collapse: collapse;
text-align: left;
border: 1px solid black;
}
table {
width: 100%;
}
td,
th {
height: 50px;
padding: 10px;
width: 200px;
min-width: 100px;
}
th {
background-color: gray;
margin-bottom: 50px;
}
.headers {
margin-bottom: 5px;
}
button {
background-color: #4CAF50;
/* Green */
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin-top: 30px;
}
.pop-container {
text-align: center;
/* display: none;*/
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 100%;
background-color: rgba(0, 0, 0, 0.6);
}
form {
background-color: gray;
}
input {
font-size: 20px;
width: 300px;
margin-bottom: 5px;
}
<!DOCTYPE html>
<meta charset="UTF-8">
<html lang="en">
<head>
<link rel="stylesheet" type="text/css" href="style.css">
</stylesheet>
<script type="text/javascript" src="http://livejs.com/live.js"></script>
</head>
<body>
<div class="pop-container">
<form id="bookquery">
<input type="text" name="title" id="title" placeholder="Title"></br>
<input type="text" name="author" placeholder="Author"></br>
<input type="text" name="pages" placeholder="Pages"></br>
<p>Have you read it?<input type="checkbox" placeholder="Title" name="read"></p>
</br>
<button id="submit">Submit</button>
</form>
</div>
<table class="headers">
<th>Title</th>
<th>Author</th>
<th>Pages</th>
<th>Read</th>
</table>
<table class="table tstyle">
</table>
<button id="add">Add new book</button>
<script src="script.js"></script>
</body>
</html>
function checkForm(e) {
e.preventDefault(); // prevent the form from being submitted
let name = document.querySelector('input[name="title"]').value
let author = document.querySelector('input[name="author"]').value
let pages = document.querySelector('input[name="pages"]').value
let read = document.querySelector('input[name="read"]').checked
addtoLibrary(name, author, pages, read)
}

The above answers didn't quite work for me so here is a simplified, fully working example. As a general guide to getting things like this to work I always try to simplify as much as possible.
index.html
<html>
<header></header>
<body>
<div>
<form id="myForm">
<label for="title">title:</label><br>
<input type="text" id="title" name="title" value="title"><br>
<button id="submit">Submit</button>
</form>
</div>
<script type="text/javascript" src="functions.js"></script>
</body>
</html>
functions.html
let myLibrary = [];
function Book(title) {
this.title = title;
myLibrary.push(this);
}
function checkForm(){
let title = document.querySelector('input[name="title"]').value;
new Book(title);
myLibrary.forEach(function(element) {
console.log(element);
});
}
document.getElementById("myForm").addEventListener(
'submit',
function(e) {
e.preventDefault();
checkForm();
}
);
I'll leave it to you to add back in the other fields on the Book object.

I am not sure because I've tried to illustrate that your code actually stores the object. It's either that your form refreshes the page... that might be the cause but as far as the code you've provided is concerned, everything works as expected.
let myLibrary = []
function Book(title,author,pages,read) {
this.title = title
this.author = author
this.pages = pages
this.read = read
myLibrary.push(this)
}
function checkForm(name,author,pages,read)
{
new Book(name,author,pages,read)
}
checkForm("Chris","Jerry","56","65");
checkForm("Sean","John","56","65");
// Both Objects are still stored...
console.log(myLibrary);

How to add eventlistener to dynamically created divs

How to add event delegation to dynamically created divs, to change property of the target div? I've tried several suggestions that I found for event delegation but none of them work. I think I'm making some mistakes but I don't know how to fix.
I am trying to develop a file thumbnail list interface with HTML and JavaScript. I made a method that draws thumbnails dynamically from an Array. And now I want to add some functions to manipulate the thumbnails, ex. changing border color of the item(div) when it is clicked.
First I tried loop-method to add event listeners to the divs, but it didn't work well. And now I learned that event delegation is better way to add event listeners to dynamically created elements. But the problem is that though I'v tried codes but they didn't work at all.
I think I am making some mistakes or mis-using methods but I don't know what is the problem.
JavaScript
function drawThumbnails(area, list){
var j
var createdList = []
for (j=0; j<list.length; j++){
var thmb = document.getElementById("fileThumb");
var name = document.getElementById("itemName");
var date = document.getElementById("itemDate");
var thmbimg = document.getElementById("fileThumbImage");
var thmbicon = document.getElementById("file_icon_thumb");
name.innerHTML=list[j][0];
date.innerHTML=list[j][1];
if (list[j][2] == "folder"){
thmbimg.src = "thmb_folder.png";
thmbicon.style.display = "none";
}
else {
if (list[j][2] == "img"){
thmbimg.src=getthmbimgsample();
}
else{
thmbimg.src = getThmbimg(list[j][2]);
}
thmbicon.style.display = "block";
thmbicon.src = getThmbicon(list[j][2]);
}
var cln = thmb.cloneNode(true);
cln.style.display = "block";
document.getElementById(area).append(cln);
createdList.push(cln);
}
thmbLists.push(createdList);
}
drawThumbnails("folderArea", folders);
drawThumbnails("fileArea", files);
document.getElementById("folderArea").addEventListener('click',function(e){
if(e.target && e.target.className == "fileThumb"){
e.target.style.borderColor = "#408CFF";
}
});
HTML
<body>
<div class = "contentArea" id="contentArea">
<div class = "thumbArea" id="folderArea">
<div class = "fileThumb" id="fileThumb">
<img src="icon_thumb_folder.png" class="fileThumb_normal" id="fileThumbImage">
<div class="fileName">
<img src="icon_thumb_file.png" style="width: 20px;" id="file_icon_thumb">
<div class="fileNameLine" id = "itemName">File/FolderName</div>
<div class="fileNameDate" id="itemDate">Date</div>
</div>
</div>
</div>
<div class = "contentAreaSectionHeader">
<input type="checkbox" id="chTest2" name="chTest2">
<label for="chTest2"><span>Files</span></label>
</div>
<div class = "thumbArea" id="fileArea">
</div>
</body>
CSS
.fileThumb{
width: 213px;
height: 183px;
border-radius: 2px;
border-style: solid;
border-width: 1px;
border-color: #EEEEEE;
text-align: center;
position: relative;
float:left;
margin: 18px;
display: none;
overflow: hidden;
}

Using template strings to append HTML

New to es6, is there a way to append HTML using template literals `` in the DOM without overwriting what was currently posted?
I have a huge block of HTML that I need to post for a list that is being created. Where a user is able to post their input.
Every-time the task is submitted it overwrites the current submission. I need it to append underneath.
fiddle for demonstration purpose.
https://jsfiddle.net/uw1o5hyr/5/
<div class = main-content>
<form class ='new-items-create'>
<label>Name:</label><input placeholder=" A Name" id="name">
<button class = "subBtn">Submit</button>
</form>
</div>
<span class="new-name"></span>
JavaScript
form.addEventListener('submit',addItem);
function addItem(event){
event.preventDefault();
let htmlStuff =
`
<div class="main">
<div class="a name">
<span>${name.value}</span>
</div>
<div>
`
itemCreated.innerHTML = htmlStuff;
}

insertAdjacentHTML() adds htmlString in 4 positions see demo. Unlike .innerHTML it never rerenders and destroys the original HTML and references. The only thing .innerHTML does that insertAdjacentHTML() can't is to read HTML. Note: assignment by .innerHTML always destroys everything even when using += operator. See this post
const sec = document.querySelector('section');
sec.insertAdjacentHTML('beforebegin', `<div class='front-element'>Front of Element</div>`)
sec.insertAdjacentHTML('afterbegin', `<div class='before-content'>Before Content</div>`)
sec.insertAdjacentHTML('beforeend', `<div class='after-content'>After Content</div>`)
sec.insertAdjacentHTML('afterend', `<div class='behind-element'>Behind Element</div>`)
* {
outline: 1px solid #000;
}
section {
margin: 20px;
font-size: 1.5rem;
text-align: center;
}
div {
outline-width: 3px;
outline-style: dashed;
height: 50px;
font-size: 1rem;
text-align: center;
}
.front-element {
outline-color: gold;
}
.before-content {
outline-color: blue;
}
.after-content {
outline-color: green;
}
.behind-element {
outline-color: red;
}
<section>CONTENT OF SECTION</section>

You can just use += to append:
document.getElementById('div').innerHTML += 'World';
<div id="div">
Hello
</div>

Element.prototype.appendTemplate = function (html) {
this.insertAdjacentHTML('beforeend', html);
return this.lastChild;
};
If you create the element prototype as per above, you can get the element back as reference so you can continue modifying it:
for (var sectionData of data) {
var section = target.appendTemplate(`<div><h2>${sectionData.hdr}</h2></div>`);
for (var query of sectionData.qs) {
section.appendTemplate(`<div>${query.q}</div>`);
}
}
Depending on how much you're doing, maybe you'd be better off with a templating engine, but this could get you pretty far without the weight.

Get input value and generate multiple textarea and set value there

I have a DOM like this, when i fill the input field and click the button i need to create a textarea element and and stored the input value there.
if i click multiple times create multiple textarea and multiple ID's, How can i do this please check my code, Best answers must be appreciated
$('#note').on('click', function(){
var storedNoteVal = $('#enterVal').val();
var count_id = 1;
var noteCov = $('.note_cover');
$('#content_bag').prepend('<div class="full-width note_cover" id="noteId"><textarea></textarea></div>');
$(noteCov).find('textarea').val(storedNoteVal);
$(noteCov).each(function(index, element) {
$(this).attr('id', 'noteId' + count_id);
count_id++;
});
});
.full-width.note_cover {
float: left;
margin-bottom:15px;
}
.note_cover textarea {
height: auto !important;
height: 45px !important;
resize: none;
width: 100%;
/*border:none;*/
}
<div class="col-md-11 col-md-offset-1 col-sm-8 col-xs-12 mtp" id="content_bag">
</div><!-- #content_bag -->
<input type="text" placeholder="Enter project Tags" class="majorInp" id="enterVal" />
<button id="note">click me</button>

Your code is working fine, just put storedNoteVal in text-area, and input won't generate any text-area if its blank.
$('#note').on('click', function() {
var storedNoteVal = $('#enterVal').val();
var count_id = 1;
var noteCov = $('.note_cover');
if(storedNoteVal){
$('#content_bag').prepend('<div class="full-width note_cover" id="noteId"><textarea>' + storedNoteVal + '</textarea></div>');
//$(noteCov).find('textarea').val(storedNoteVal);
$(noteCov).each(function(index, element) {
$(this).attr('id', 'noteId' + count_id);
count_id++;
});
}
});
.full-width.note_cover {
float: left;
margin-bottom: 15px;
}
.note_cover textarea {
height: auto !important;
height: 45px !important;
resize: none;
width: 100%;
/*border:none;*/
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<div class="col-md-11 col-md-offset-1 col-sm-8 col-xs-12 mtp" id="content_bag">
</div>
<!-- #content_bag -->
<div>
<input type="text" placeholder="Enter project Tags" class="majorInp" id="enterVal" />
<button id="note">click me</button>
</div>

Building on Abhinshek answer -
Your code actually reassign id's to the textareas, since you loop through all the elements after prepending them.
You could define count_id as a window variable (outside the click function) and then just use it.
Also, you don't need to wrap noteCov with $() since $('.note_cover') returns a jQuery objects array
var count_id = 1;
$('#note').on('click', function() {
var storedNoteVal = $('#enterVal').val();
$('#content_bag').prepend('<div class="full-width note_cover" id="noteId_'+count_id+'"><textarea>' + storedNoteVal + '</textarea></div>');
count_id++;
});
This way each textarea gets it's own unique id that doesn't change