I designed a comment section with a reply. I want a comment form to be created under the same comment when the user clicks on the reply button. I wrote this myself, but when I click on the reply button, the form is created only for the first comment.
function addtextbox() {
  // Create a form dynamically.
  var form = document.createElement("form");
  
  form.setAttribute("method", "post");
  form.setAttribute("action", "submit.php");
  // Create an input element for replyText.
  var ID = document.createElement("input");
  
  ID.setAttribute("type", "text");
  ID.setAttribute("name", "body");
  ID.setAttribute("placeholder", "Your Comment");
  form.append(ID);
  document.getElementsByClassName('formbox')[0].appendChild(form);
}<button onclick="addtextbox()">reply</button>
<div class="formbox"></div> 
     
    