JSFiddle - React, Tailwind, and code Playground

by kos0760

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- 
  Bootstrap docs: https://getbootstrap.com/docs
-->

<div class="container">
  <form>
  <div class="row panels last-panel">
    <div class="col-2">
      <label for="staticEmail" class="col-form-label">Панель №<span>1</span></label>
    </div>
    <div class="col">
      <input type="text" class="form-control" placeholder="Ширина">
    </div>
    <div class="col">
      <input type="text" class="form-control" placeholder="Высота">
    </div>
  </div>  
</form>
</div>

CSS

.row {  
  margin-top: 30px;
}

JavaScript

$('form').each(function (){
	var ths = $(this);
	var panels = $(this).find('.panels');
	var last_panel = $(this).find('.last-panel');  
	$(ths).find('.last-panel input').focus(function(){
  
		$(last_panel).clone().appendTo(last_panel.parent());
    
    $(ths).find('.panels').each(function(i){
    	$(this).removeClass("last-panel");
    	$(ths).find('.panels:last').addClass("last-panel");
      $(this).find('label span').html(i + 1);
    });
	 
	})
});