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How to reorder elements by JavaScript

Let's say I got 6 divs, and their current order is 1 to 6, how do I reorder them to make it become 612345?
I've tried to store them into a variable and use getElementsByClassName, then use the slice method and the insertAdjacentElement method but it couldn't work...
const btn = document.querySelector('.reorder');
const elm = document.getElementsByClassName('items');
const lastIndexOfElm = elm.length -1
function reorder() {
let newElm = [...elm].slice(0, lastIndexOfElm);
elm[lastIndexOfElm].insertAdjacentElement('afterend', newElm);
}
btn.addEventListener('click', reorder)
<button class="reorder">Reorder</button>
<div class="items">1</div>
<div class="items">2</div>
<div class="items">3</div>
<div class="items">4</div>
<div class="items">5</div>
<div class="items">6</div>

if you want to move the last item of ".items" to the first item, this code may help you.
const btn = document.querySelector('.reorder');
const elm = document.getElementsByClassName('items');
const lastIndexOfElm = elm.length -1
function reorder() {
let lastElm = elm[lastIndexOfElm];
elm[lastIndexOfElm].remove();
document.body.insertBefore(lastElm, elm[0]);
}
btn.addEventListener('click', reorder)
<button class="reorder">Reorder</button>
<div class="items">1</div>
<div class="items">2</div>
<div class="items">3</div>
<div class="items">4</div>
<div class="items">5</div>
<div class="items">6</div>

It may or may not work for your situation, but another possibility is putting them all in a flexbox and using the CSS order property to change the ordering:
<div style="display: flex;">
<div style="order: -1">1</div> <!-- first -->
<div style="order: 10">2</div> <!-- last -->
<div>3</div>
<div>4</div>
</div>
Then in Javascript you only need to adjust the CSS style's order property to change the ordering dynamically.

remove any child element after certain div index by javascript or jquery

i have this html collection, i want if i click on any div class ".sday"
any other div that are present after that be remove .
for example if we click on sday 2 we should keep sday1 and sday 2, and 3 and 4 must delete
my script removing count is ok but it delete wrong div.
any idea?
<div id="parent" class="parent">
<div class="room-sheet">
<div class="sday">1</div>
</div>
<div class="room-sheet">
<div class="sday">2</div>
</div>
<div class="room-sheet">
<div class="sday">3</div>
</div>
<div class="room-sheet">
<div class="sday">4</div>
</div>
</div>
script(using jquery)
<script>
$(".sday").click(function(){
console.log("hello");
var parentElement = $(this).parent().parent().find('.room-sheet');
var parentChildernCount = $(this).parent().parent().find('.room-sheet').length;
var elementIndex = $(this).closest('.room-sheet').index();
var dd = parentChildernCount - elementIndex;
for(let i=elementIndex; i < dd; i++){
//note: make sure any element after our index in deleted!!!
$("#parent").find('.room-sheet').children().eq(i).remove();
}
})
</script>

Listen for clicks on a .sday on the parent, navigate to the parent of the clicked .sday (a .room-sheet), call nextAll to get all subsequent siblings, and .remove() them:
$('#parent').on('click', '.sday', function() {
$(this).parent().nextAll().remove();
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="parent" class="parent">
<div class="room-sheet">
<div class="sday">1</div>
</div>
<div class="room-sheet">
<div class="sday">2</div>
</div>
<div class="room-sheet">
<div class="sday">3</div>
</div>
<div class="room-sheet">
<div class="sday">4</div>
</div>
</div>
Also, there's no need to require a big library like jQuery for something this simple, you may implement this with native DOM methods, if you like:
document.querySelector('#parent').addEventListener('click', ({ target }) => {
if (!target.matches('.sday')) {
return;
}
const sheet = target.parentElement;
while (sheet.nextSibling) {
sheet.nextSibling.remove();
}
});
<div id="parent" class="parent">
<div class="room-sheet">
<div class="sday">1</div>
</div>
<div class="room-sheet">
<div class="sday">2</div>
</div>
<div class="room-sheet">
<div class="sday">3</div>
</div>
<div class="room-sheet">
<div class="sday">4</div>
</div>
</div>

Save the current number and the maximum number in variables then just iterate through them, making sure not to delete the clicked one:
$(".sday").on("click", function() {
let start = parseInt($(this).text());
let finish = parseInt($(".sday").last().text());
for (let i = start + 1; i <= finish; i++) {
$(`.sday:conatins(${i})`).remove();
}
});

Appending Div Elements within a Cloned Object

I simply just want to add some data to the "employeeId" div element within a cloned object and can't figure out the proper syntax to do so.
Here is some of the layout of the original object:
<div id="container">
<div id="reimbursement">
<div class="row">
<div class="col">
Employee ID:
<div id="employeeId">
</div>
And here is the JavaScript that was used to create the clone:
let reimbursement = document.getElementById("reimbursement");
let reimbursementClone = reimbursement.cloneNode(true);
document.getElementById("container").appendChild(reimbursementClone);

Simply use querySelector to get the element from the new clone and add the relevant data to it:
let reimbursement = document.getElementById("reimbursement");
let reimbursementClone = reimbursement.cloneNode(true);
document.getElementById("container").appendChild(reimbursementClone);
reimbursementClone.querySelector("#employeeId").innerText = "something";
<div id="container">
<div id="reimbursement">
<div class="row">
<div class="col">
Employee ID:
<div id="employeeId">
</div>
</div>
</div>
</div>
Although the above code would work, your cloning causes multiple instances of the same id which is invalid. You should change the employeeId to a class and pass a class selector to reimbursementClone.querySelector.

Get sister element using jQuery

Is there a way to get a next element from a current sister element? Sorry if confusing.
<div class="wrapper">
<div class="paDiv">
<div class="saDivOne">
</div>
</div>
<div class="paDivTwo">
<div class="saDivTwo">
</div>
</div>
</div>
<script>
$('.paDiv').each(function(){
htmlContent = $(this).children().html();
SisterDivContent = $(this).next('.paDivTwo').children().html();
console.log(SisterDivContent);
})
</script>

$('.paDiv').each(function(){
var SisterDivContent = $(this).parent().find('.saDivTwo').html();
alert(SisterDivContent);
});
You have to add some contents inside div class 'saDivTwo'. Otherwise you will get empty content only.
Demo:
http://jsfiddle.net/U8n7g/

Try using .sibling:
$('.paDiv').sibling('paDivTwo').html()

wrap more than one nodes with div

How can i wrap exactly half of the div's with another div using jquery or javascript
I have this
<div class="post">1</div>
<div class="post">2</div>
<div class="post">3</div>
<div class="post">4</div>
<div class="post">5</div>
<div class="post">6</div>
I want this
<div class="wrap">
<div class="post">1</div>
<div class="post">2</div>
<div class="post">3</div>
</div>
<div class="wrap">
<div class="post">4</div>
<div class="post">5</div>
<div class="post">6</div>
</div>

Try using this:
var posts = $('.post'),
postCount = posts.length,
postHalf = Math.round(postCount/2),
wrapHTML = '<div class="wrap"></div>';
posts.slice(0, postHalf).wrapAll(wrapHTML); // .slice(0, 3)
posts.slice(postHalf, postCount).wrapAll(wrapHTML); // .slice(3, 6)
This selects all .post, gets the number of elements found then halves that value to get the splitting point. It then uses .slice() to select a specific range of elements and .wrapAll() to wrap each selection in <div class="wrap"></div>.
Here it is working: http://jsfiddle.net/ekzrb/