JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css">
<div class="container">

  <h3>Modal Example</h3>

  <!-- Button to trigger modal -->
  <div>
    <a data-target="#myModal" role="button" class="btn" data-toggle="modal">Launch Modal</a>
  </div>

  <div class="modal fade" tabindex="-1" role="dialog" id="myModal">
    <div class="modal-dialog" role="document">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
          <h4 class="modal-title">Modal title</h4>
        </div>
        <div class="modal-body">
          <p>One fine body&hellip;</p>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
          <button type="button" class="btn btn-primary">Save changes</button>
        </div>
      </div>
      <!-- /.modal-content -->
    </div>
    <!-- /.modal-dialog -->
  </div>
  <!-- /.modal -->

</div>

JavaScript

$('#myModal').on('shown.bs.modal', function() {
  $(".modal-body").html("Loading...");
  $.ajax({
    url: "/echo/json",
    data: {
      delay: 2
    },
    method: "POST",
    success: function(data) {
      $(".modal-body").html("Result data");
    }
  })
});