JSFiddle - React, Tailwind, and code Playground

HTML

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="form1" method="post" class="form-horizontal" role="form">
  <fieldset>


    <div class="form-group">
      <div class="col-xs-2">
        <input type="text" list="products" class="form-control product" name="product" />
        <datalist id="products" class="products"></datalist>
      </div>

      <div class="col-xs-4">
        <input id="" type="text" class="form-control description" name="description-0" />
      </div>



      <div class="col-xs-1">
        <button type="button" class="btn btn-default addButtonDED"><i class="fa fa-plus"></i></button>
      </div>
    </div>

    <div class="col-xs-10 ">
      <button type="submit" name="formAction" value="next" class="btn btn-primary">sUBMIT</button>

    </div>



  </fieldset>
</form>

JavaScript

var dataList = $('.products');
var jsonOptions = [{
  "product": "11111",
  "description": "description 1"
}, {
  "product": "22222",
  "description": "description 2"
}, {
  "product": "33333",
  "description": "description 3"
}];

jsonOptions.forEach(function(item) {

  var option = '<option value="' + item.product + '">' + item.description + '</option>';

  dataList.append(option);
});

$(function() {
  $('body').on('input', '.product,.products', function() {

    var i = this.value;
    var description = "";
    var productsInBox = 0;

    jsonOptions.forEach(function(a) {
      if (a.product == i) {
        description = a.description;
      }
    });
    $(this).closest('.form-group').find('.description').val(description);


  });
});

counter = 0;

$('#form1').on('click', '.addButtonDED', function() {
  counter++;

  var $template = $('.form-group:last').clone(true, true).find('input').val('').end()
    .find('.addButtonDED').removeClass('addButtonDED').addClass('removeButtonDED').end()
    .find('.description').attr('name', 'description-' + counter).end()
    .find('i').removeClass('fa-plus').addClass('fa-minus').end();
  $template.insertAfter('.form-group:last');

})

// Remove button click handler
.on('click', '.removeButtonDED', function() {
  counter--;
  var $row = $(this).closest('.form-group');
  $row.remove();
});