I’m creating a To Do List application using Node, express and EJS. When a button is clicked, HTML code should be added

I'm trying to add this piece of code to my EJS whenever a button is clicked.

  <div>
            <input type="checkbox" class="checkBox">
            <input type="text" class="textField">
            <hr>
  </div>




Form code: 
<form action="/add" method="POST">
           <input class="textField" type="text" name="newItem" placeholder="New Task" required>
           <button type="submit" class="btn btn-md btn-task" id="buttonAdd">New Task</button>
</form>

My webpage consists of a list, the user can add as many tasks as they want whenever the button inside the form is clicked. How do I make this functionality work and how do I write it in code?

In my current code, whenever a task is added, it disappears.