JSFiddle - React, Tailwind, and code Playground

by AsciiSmoke

HTML

<!DOCTYPE html>
<html>
<head>
<style>
.grid-container {
  display: grid;
  grid-template-columns: auto auto auto auto;
  grid-gap: 10px;
  background-color: #2196F3;
  padding: 10px;
}

.grid-container > div {
  background-color: rgba(255, 255, 255, 0.8);
  text-align: center;
  padding: 20px 0;
  font-size: 30px;
}
</style>
</head>
<body>

<p><button onclick="myFunction()">Change layout</button></p>

<div class="grid-container" id="myDIV">
  <div class="item1">1</div>
  <div class="item2">2</div>
  <div class="item3">3</div>  
  <div class="item4">4</div>
  <div class="item5">5</div>
  <div class="item6">6</div>
  <div class="item7">7</div>
  <div class="item8">8</div>
</div>

</body>
</html>

JavaScript

function myFunction() {
	var theGrid = document.getElementById("myDIV");
  var currentCount = theGrid.childElementCount;
  console.log(currentCount);
  
  var newCount = currentCount+ 1;
  var newElem = document.createElement("DIV");
  
  newElem.innerText = newCount;  
  newElem.classList.add("item" + newCount);
  
  theGrid.appendChild(newElem);
}