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How do I stop JavaScript element clearing everything on click

The first delete produced works fine when clicked on "add more" but del element produced after that deletes everything present on the page. Can someone please help me, maybe something is wrong with ele, I don't have much experience with JS
Steps to reproduce :
Click on add more and then the next add more which got created on click the previous add more.
click on the last del
It deletes everything rather than deleting that very DIV
$(function() {
$(".btn-copy").on('click', function() {
var ele = $(this).closest('.example-2').clone(true);
ele.find('input').val('')
if (ele.find('button').length<2) {
let btn = document.createElement("button");
btn.innerHTML = "Delete";
btn.onclick = (e) => {
e.preventDefault()
ele.remove()
}
ele[0].appendChild(btn);
}
$(this).closest('.example-2').after(ele);
})
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="row">
<div class="col-lg-12">
<div class="card">
<div class="card-header">
<h5 class="card-title">Add Class</h5>
</div>
<div class="card-body">
<form action="#">
<div class="example-2 form-group row">
<!--<label class="col-form-label col-md-2">Input Addons</label>-->
<div class="col-xs-2">
<div class="input-group">
<div class="input-group-prepend">
<span class="input-group-text">Class Name</span>
</div>
<input class="form-control" type="text">
<div class="input-group-append">
<button class="btn-copy btn btn-primary" type="button">Add More</button>
</div>
</div>
</div>
</div>
<div class="form-group row">
<div class="col-xs-2">
<button class="btn btn-primary" type="button">Submit</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>

The problem was in the use of .clone()
You where cloning the latest cloned element which forced you to create an if statement to prevent creating more than one delete button. But that also did not allow you to execute what was inside the if statement after a certain number of nodes cloned.
You also could not use the btn variable outside that if statement.
The solution is to clone always the first example-2element so we can jump the use of the if statement and allow the btn variable to be used freely.
I added an extra div #wrapper to use find('div').first() so the same example-2 element can be copied every time.
Snippet
$(function() {
$(".btn-copy").on('click', function() {
var ele = $('#wrapper').find('div').first().clone(true);
ele.find('input').val('');
let btn = document.createElement("button");
btn.innerHTML = "Delete";
ele[0].appendChild(btn);
btn.onclick = (e) => { ele.remove() };
$(this).closest('.example-2').after(ele);
})
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="wrapper">
<div class="example-2 form-group row" style="margin-top:15px">
<div class="col-xs-2">
<div class="input-group">
<div class="input-group-prepend">
<span class="input-group-text">Class Name</span>
</div>
<input class="form-control" type="text">
<div class="input-group-append">
<button class="btn-copy btn btn-primary" type="button">Add More</button>
</div>
</div>
</div>
</div>
<div class="form-group row">
<div class="col-xs-2">
<button class="btn btn-primary" type="button" style="margin-top:30px">Submit</button>
</div>
</div>
</div>

Increment a random number with a button?

I'm new to coding and I have the following problem:
I created a random number and I have it in a p tag which has a class, then I tried to increment this number by clicking on a button. This is my code so far:
$(document).ready(function(){
let films = JSON.parse(movies);
for (let i = 0; i < films.length; i++){
let movie = `
<div class="container">
<div class="poster">
<img class="pic" src="${films[i].image}">
</div>
<div class="text-box">
<div class="details">
<h2>${films[i].title}</h2>
<p>${films[i].releaseDate}</p>
<p>Genre: ${films[i].genre}</p>
<p>Director: ${films[i].director}</p>
</div>
<div class="like-box">
<input type="button" class="btn" value="Like 👍" number="${i}"></input>
<p class="counter"></p>
</div>
</div>
</div>
`;
$("#main2").append(movie);
$(".counter").text(Math.floor((Math.random()*100) + 1));
}
$(".btn").click(function() {
let el = parseInt($(".counter").text());
$(".counter").text(el+1);
})
});
The problem is, that if I click on the button instead of getting for example: 19 then after the click 20, what I get is 191919191920. So basically the button works, but not exactly how I want it to work. Can anybody help me please?

for (let i = 0; i < films.length; i++){
after this for loop is done, there will be films.length elements in dom with class counter.
and what this $(".counter").text() will return is concatenation of all text in elements with classes counter. That's why you got 191919191920.

Changes you would need to do:
Add new class to the container increaseing row count. This is mandatory to identify which movie you're on and increase the like value.
<div class='container row-" +i+ "'">
Then add onClick event to the like button to pass which row you're on. This is to identify which counter to increase the value.
<input type="button" class="btn" value="Like 👍" number="1" onclick="incrementLikes('row-" +i+ "')"></input>
$(document).ready(function() {
$(".counter").text(Math.floor((Math.random() * 100) + 1));
});
function incrementLikes(rowId) {
let mainRow = document.getElementsByClassName(rowId)[0];
let counter = parseInt(mainRow.getElementsByClassName('counter')[0].innerHTML);
mainRow.getElementsByClassName('counter')[0].innerHTML = counter + 1;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container row-1">
<div class="poster">
<img class="pic" src="">
</div>
<div class="text-box">
<div class="details">
<h2>Film Title 1</h2>
<p>13/06/2020</p>
<p>Genre: Action</p>
<p>Director: John Doe</p>
</div>
<div class="like-box">
<input type="button" class="btn" value="Like 👍" number="1" onclick="incrementLikes('row-1')"></input>
<p class="counter"></p>
</div>
</div>
</div>
<div class="container row-2">
<div class="poster">
<img class="pic" src="">
</div>
<div class="text-box">
<div class="details">
<h2>Film Title 2</h2>
<p>13/06/2020</p>
<p>Genre: Action</p>
<p>Director: John Doe</p>
</div>
<div class="like-box">
<input type="button" class="btn" value="Like 👍" number="1" onclick="incrementLikes('row-2')"></input>
<p class="counter"></p>
</div>
</div>
</div>
<div class="container row-3">
<div class="poster">
<img class="pic" src="">
</div>
<div class="text-box">
<div class="details">
<h2>Film Title 3</h2>
<p>13/06/2020</p>
<p>Genre: Action</p>
<p>Director: John Doe</p>
</div>
<div class="like-box">
<input type="button" class="btn" value="Like 👍" number="1" onclick="incrementLikes('row-3')"></input>
<p class="counter"></p>
</div>
</div>
</div>

The problem is your selector ".counter"
$(".counter").text returns the combined string value of all elements that have the class ".counter"
I have modified your code using selectors specific to the clicked button
let films = JSON.parse(movies);
for (let i = 0; i < films.length; i++){
let buttonId = "button" + i;
let movie = `
<div class="container">
<div class="poster">
<img class="pic" src="${films[i].image}">
</div>
<div class="text-box">
<div class="details">
<h2>${films[i].title}</h2>
<p>${films[i].releaseDate}</p>
<p>Genre: ${films[i].genre}</p>
<p>Director: ${films[i].director}</p>
</div>
<div class="like-box">
<input id="${buttonId}" type="button" class="btn" value="Like 👍" number="${i}"></input>
<p class="counter"></p>
</div>
</div>
</div>
`;
$("#main2").append(movie);
$("#${buttonId}.btn").next().text(Math.floor((Math.random()*100) + 1));
}
$("#${buttonId}.btn").click(function() {
let el = parseInt($("#${buttonId}.btn").next().text());
$("#${buttonId}.btn").next().text(el+1);
})

document.getElementById with multiple buttons

I have six buttons and I want to have all in one function. For each button is a different div available and if I click for example the third button, then should pop up the div for the third button.
javascript:
function kfunc(){
var x = document.getElementById("id1"||"id2"||"id3"||"id4"||"id5" || "id6")
x.style.display = 'block';
x;
}
function closefunc(){
document.getElementById("id1"||"id2"||"id3"||"id4"||"id5" || "id6").style.display = 'none';
}
function testfunc(){
alert("test");
}
HTML:
<button id="btn1" onclick="kfunc()">Küche</button>
<button id="btn2" onclick="kfunc()">Bad</button>
<button id="btn3" onclick="kfunc()">Wohnzimmer</button>
<button id="btn4" onclick="kfunc()">Melina</button>
<button id="btn5" onclick="kfunc()">Kleines Bad</button>
<button id="btn6" onclick="kfunc()">Schlafzimmer</button>
<!-- Küche -->
<div class="frame_kueche" id="id1">
<div class="buttons_close">
<button onclick="closefunc()">X</button>
</div>
<button onclick="testfunc()">ab</button>
</div>
<!-- Bad -->
<div class="frame_bad" id="id2">
<div class="buttons_close">
<button onclick="closefunc()">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- Wohnzimmer -->
<div class="frame_wohnzimmer" id="id3">
<div class="buttons_close">
<button onclick="closefunc()">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- Melina -->
<div class="frame_melina" id="id4">
<div class="buttons_close">
<button onclick="closefunc()">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- kleines Bad -->
<div class="frame_kleines_bad" id="id5">
<div class="buttons_close">
<button onclick="closefunc()">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- Schlafzimmer -->
<div class="frame_schlafzimmer" id="id6">
<div class="buttons_close">
<button onclick="closefunc()">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
It works almost! Logically when there is id1 available, it will use id1 and not the others. How can I fix it? Like I said: When btn3 is clicked then the div with id3 should show up but it always shows id1.

Look at your javascript. Actually you don't need to set id attribute for your buttons.
Just add your frame id as parameter to kfunc and closefunc function. Like this:
function kfunc(id) {
console.log(id)
document.getElementById(id).style.display = 'block'
}
function closefunc(id) {
console.log(id)
document.getElementById(id).style.display = 'none'
}
Usage:
onclick="kfunc('id1')"
onclick="closefunc('id1')"
Note: My solution is not tested. Hope you get the idea.

If you change your html to include a data attribute in the buttons, and to also pass 'this' in your onClick function call
<button id="btn1" data-div="id1" onclick="kfunc(this)">Küche</button>
<button id="btn2" data-div="id2" onclick="kfunc(this)">Bad</button>
And then in your function you can check which button was pressed, and display the appropriate div.
function kfunc(thispass) {
let fish = thispass.getAttribute('data-div');
document.getElementById(fish).style.display = 'block';
}
As for the close button. If you give all of the divs a common class, you can hide them all at once.

You can't use getElementById like this. you should use getElementByClassName or you can use the code below:
function kfunc(id){
var btn = id;
document.getElementById(id).style.display = 'block';
}
function closefunc(id){
var selectedDiv = id;
document.getElementById(id).style.display = 'none';
}
function testfunc(){
alert("test");
}
div[class^= "frame"]{
display: none;
}
<button id="btn1" onclick="kfunc('id1')">Küche</button>
<button id="btn2" onclick="kfunc('id2')">Bad</button>
<button id="btn3" onclick="kfunc('id3')">Wohnzimmer</button>
<button id="btn4" onclick="kfunc('id4')">Melina</button>
<button id="btn5" onclick="kfunc('id5')">Kleines Bad</button>
<button id="btn6" onclick="kfunc('id6')">Schlafzimmer</button>
<!-- Küche -->
<div class="frame_kueche" id="id1">
<div class="buttons_close">
<button onclick="closefunc('id1')">X</button>
</div>
<button onclick="testfunc()">ab</button>
</div>
<!-- Bad -->
<div class="frame_bad" id="id2">
<div class="buttons_close">
<button onclick="closefunc('id2')">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- Wohnzimmer -->
<div class="frame_wohnzimmer" id="id3">
<div class="buttons_close">
<button onclick="closefunc('id3')">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- Melina -->
<div class="frame_melina" id="id4">
<div class="buttons_close">
<button onclick="closefunc('id4')">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- kleines Bad -->
<div class="frame_kleines_bad" id="id5">
<div class="buttons_close">
<button onclick="closefunc('id5')">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>
<!-- Schlafzimmer -->
<div class="frame_schlafzimmer" id="id6">
<div class="buttons_close">
<button onclick="closefunc('id6')">X</button>
</div>
<button onclick="testfunc()">a</button>
</div>

On one button click event for three pages

I have one page website, with three forms. The first form has class active and the rest are hidden. All forms have buttons with same class .all-pages.
When I click on next button I want the first page to get class hidden, and second get active. When I'm on the second form click on the SAME button NEXT I want the second page to get class hidden, and the third page get active. Please HELP ME :)
And please just JavaScript.
I have 3 forms like this:
<div class="container-fluid"> <!-- first page container -->
<div class="row">
<div class="col-lg-5 col-lg-offset-3">
<form class="well margin-form-top form-color-bg page1">
<div class="row"> <!-- webpage name -->
<div class="col-lg-4 col-lg-offset-4">
<h2>Book a Room</h2>
</div>
</div>
<div class="row"> <!-- information about webpage -->
<div class="col-lg-7 col-lg-offset-2 h4">
<p>This information will let us know more about you.</p>
</div>
</div>
<div class="row"> <!-- navigation -->
<div class="col-lg-12 button-padding-zero">
<ul class="nav nav-pills nav-justified btn-group">
<button type="button" class="btn btn-danger btn-default btn-lg button-width navigation-font-size border-r grey-bg all-pages red active" data-page="0">
<b>ACCOUT</b>
</button>
<button type="button" class="btn btn-default btn-default btn-lg button-width navigation-font-size border-l-r grey-bg all-pages red" data-page="1">
<b>ROOM TYPE</b>
</button>
<button type="button" class="btn btn-default btn-default btn-lg button-width navigation-font-size border-l grey-bg all-pages red" data-page="2">
<b>EXTRA DETAILS</b>
</button>
</ul>
</div>
</div>
<br>
<div class="row"> <!-- let's start -->
<div class="col-lg-5 col-lg-offset-4 h4">
<p>Let's start with the basic details.</p>
</div>
</div>
<br>
<div class="row"> <!-- first row email and country -->
<div class="col-lg-5 col-lg-offset-0">
<div class="input-group">
<input type="email" class="input-sm btn input-width text-left" placeholder="Your Email">
</div>
</div>
<div class="col-lg-6 col-lg-offset-1 button-padding-zero">
<select class="form-control input-sm btn input-width">
<option value="" selected>Country</option>
<option>Serbia</option>
<option>Russia</option>
<option>Brazil</option>
</select>
</div>
</div>
<br>
<div class="row"> <!-- 2nd row password and budget -->
<div class="col-lg-5 col-lg-offset-0">
<div class="input-group">
<input type="password" class="input-sm btn input-width text-left" placeholder="Your Password">
</div>
</div>
<div class="col-lg-6 col-lg-offset-1 button-padding-zero">
<select class="form-control input-sm btn input-width">
<option value="" selected>Daily Budget</option>
<option>100$</option>
<option>200$</option>
<option>300$</option>
</select>
</div>
</div>
<br>
<br>
<br>
<div class="row">
<div class="col-lg-3 col-lg-offset-9">
<button type="button" id="next-button" class="btn btn-default btn-danger btn-lg button-next-width all-pages" data-page="0">NEXT</button>
</div>
</div>
</div>
</form>
</div>
</div>
</div>
var page1 = document.querySelector('.page1');
var page2 = document.querySelector('.page2');
var page3 = document.querySelector('.page3');
var emptyArrey = [];
var nextButtons = document.querySelectorAll('.all-pages');
function nextFunction(event) {
// debugger;
var allButtons = document.querySelectorAll('.all-pages');
for (var i = 0; i < allButtons.length; i++) {
var oneButton = allButtons[i].dataset.page;
if (allButtons[i].dataset.page === '0') {
page1.classList.add('hidden');
page2.classList.remove('hidden');
return;
debugger;
} else {
page2.classList.add('hidden');
page3.classList.remove('hidden');
}
}
}
for (var nextButton of nextButtons){
nextButton.addEventListener('click', nextFunction);
}

You could use the button's attribute data-page to keep track of which form you're currently on, and then show the appropriate form.
// give your button the id "next-button"
var currentPage = document.getElementByID("next-button").getAttribute("data-page");
Once you know what form you're on, then you can hide the others as needed

If I understood your question, here is possible solution.
const nextButtons = document.querySelectorAll('.all-pages');
const pages = document.querySelectorAll('.page');
nextButtons.forEach(btn => {
btn.addEventListener('click', () => {
pages.forEach(page => {
page.hidden = true;
});
const pageActive = document.querySelector(`.page-${btn.dataset.page}`);
pageActive.hidden = false;
})
})
<div class="page page-1">
<button class="all-pages" data-page="2">NEXT 2</button>
</div>
<div class="page page-2" hidden=true>
<button class="all-pages" data-page="3">NEXT 3</button>
</div>
<div class="page page-3" hidden=true>
<button class="all-pages" data-page="1">NEXT 1</button>
</div>

Buttons to show or hide divs using single method

I have the following snippets:
My HTML Page which uses 4 buttons to show/hide four divs, each will have their own content.
var otherDivs = ["addCustomer", "searchCustomer", "addItem", "searchItem"];
function show(target) {
var index = otherDivs.indexOf(target);
for (i = 0; i < otherDivs.length; i++) {
if (i != index) {
$(document.getElementById(otherDivs[i].toString())).hide();
} else {
$(document.getElementById(otherDivs[i].toString())).show();
}
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container-fluid" style="padding-top: 10px;">
<div class="row" name="tabs">
<button class="redButton" onclick="show('addCustomer')">Add Customer</button>
<button class="redButton" onclick="show('searchCustomer')">Search Customers</button>
<button class="redButton" onclick="show('addItem')">Add Item</button>
<button class="redButton" onclick="show('searchItem')">Search Item</button>
</div>
<div class="row trigger" name="searchCustomer" id="searchCustomer">
...
</div>
<div class="row trigger" name="addCustomer" id="addCustomer">
...
</div>
<div class="row trigger" name="addItem" id="addItem">
...
</div>
<div class="row trigger" name="searchItem" id="searchItem">
...
</div>
</div>
The problem is, only the fist button and div (addCustomer) works correctly. I have tried split methods but I would prefer to keep the single method. Any help is appreciated.

Use jQuery fully when you have it.
Although with your HTML and inline script this would work:
function show(target) {
$('.trigger').hide();
$("#"+ target).show();
}
As could this (but it would not work as a radio button more like a checkbox):
function show(target) {
$("#"+ target).toggle();
}
I strongly suggest you use unobtrusive code and move the script out of the HTML
$(function() {
$(".redButton").on("click",function() { // any button
$(".trigger").hide(); // hide the divs
$("#"+$(this).data("id")).show(); // show the relevant div
});
});
.trigger { display:none }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container-fluid" style="padding-top: 10px;">
<div class="row" name="tabs">
<button type="button" class="redButton" data-id="addCustomer">Add Customer</button>
<button type="button" class="redButton" data-id="searchCustomer">Search Customers</button>
<button type="button" class="redButton" data-id="addItem">Add Item</button>
<button type="button" class="redButton" data-id="searchItem">Search Item</button>
</div>
<div class="row trigger" name="searchCustomer" id="searchCustomer">
Search Customer
</div>
<div class="row trigger" name="addCustomer" id="addCustomer">
Add Customer
</div>
<div class="row trigger" name="addItem" id="addItem">
Add Item
</div>
<div class="row trigger" name="searchItem" id="searchItem">
Search Item
</div>
</div>

Actually your code working properly but the thing is that you cannot specfiy which div is opened now because all divs have the same content, so when you add numbers or a different content you can know which one is opened now
var otherDivs = ["addCustomer", "searchCustomer", "addItem", "searchItem"];
function show(target) {
var index = otherDivs.indexOf(target);
for (i = 0; i < otherDivs.length; i++) {
if (i != index) {
$(document.getElementById(otherDivs[i].toString())).hide();
} else {
$(document.getElementById(otherDivs[i].toString())).show();
}
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container-fluid" style="padding-top: 10px;">
<div class="row" name="tabs">
<button class="redButton" onclick="show('addCustomer')">Add Customer</button>
<button class="redButton" onclick="show('searchCustomer')">Search Customers</button>
<button class="redButton" onclick="show('addItem')">Add Item</button>
<button class="redButton" onclick="show('searchItem')">Search Item</button>
</div>
<div class="row trigger" name="searchCustomer" id="searchCustomer">
.11..
</div>
<div class="row trigger" name="addCustomer" id="addCustomer">
.22..
</div>
<div class="row trigger" name="addItem" id="addItem">
.33..
</div>
<div class="row trigger" name="searchItem" id="searchItem">
.44..
</div>
</div>

Simpy use the JQuery toggle function like so
function show(target) {
$('#'+target).toggle();
}
You could replace your entire JS in the snippet to just these LOC. HTML remains the same.
function show(target) {
$('#'+target).toggle();
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container-fluid" style="padding-top: 10px;">
<div class="row" name="tabs">
<button class="redButton" onclick="show('addCustomer')">Add Customer</button>
<button class="redButton" onclick="show('searchCustomer')">Search Customers</button>
<button class="redButton" onclick="show('addItem')">Add Item</button>
<button class="redButton" onclick="show('searchItem')">Search Item</button>
</div>
<div class="row trigger" name="searchCustomer" id="searchCustomer">
...
</div>
<div class="row trigger" name="addCustomer" id="addCustomer">
...
</div>
<div class="row trigger" name="addItem" id="addItem">
...
</div>
<div class="row trigger" name="searchItem" id="searchItem">
...
</div>
</div>

Updated answer
function show(target) {
$("#Display").html( $('#' + target).html());
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container-fluid" style="padding-top: 10px;">
<div class="row" name="tabs">
<button class="redButton" onclick="show('addCustomer')">Add Customer</button>
<button class="redButton" onclick="show('searchCustomer')">Search Customers</button>
<button class="redButton" onclick="show('addItem')">Add Item</button>
<button class="redButton" onclick="show('searchItem')">Search Item</button>
</div>
<div class="row trigger" name="searchCustomer" id="searchCustomer" hidden>
Searching Customers
</div>
<div class="row trigger" name="addCustomer" id="addCustomer" hidden>
Customers added
</div>
<div class="row trigger" name="addItem" id="addItem" hidden>
Items added
</div>
<div class="row trigger" name="searchItem" id="searchItem" hidden>
Searching Items
</div>
<div id="Display">
</div>
</div>