JSFiddle - React, Tailwind, and code Playground

by SpiceLab

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<div class="container">
  <!-- Button trigger modal -->
  <button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
    Launch demo modal
  </button>
  <!-- Modal -->
  <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" displayed="false">
    <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" id="myModalLabel">Modal title</h4>
        </div>
        <div class="modal-body">
          ...
        </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>
    </div>
  </div>
</div>
<div class="container">
  <p>
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CSS

#myModal {display:none}

JavaScript

$(window).scroll(function() {
   if ($(document).scrollTop() > 300 && $("#myModal").attr("displayed") === "false") {
     $('#myModal').modal('show');
     $("#myModal").attr("displayed", "true");
   }
 });