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>
<input type="button" class="btn btn-default" name="open-modal" id="open-modal" value="Open Modal" />

<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Modal Header</h4>
      </div>
      <div class="modal-body">
        <p>Some text in the modal.</p>
        <iframe id="myIframe" width="100%">
        
        </iframe>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
      </div>
    </div>

  </div>
</div>

JavaScript

$( document ).ready(function() {
	$('#open-modal').click(function(){
  	 $('#myIframe').attr('src', 'https://www.tutorialspoint.com/php/php_object_oriented.htm');
  });
  $('#myIframe').load(function(){
    $('#myModal').modal('show');
  });
});