JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<a href="#" class="btn btn-default" id="openBtn">Open modal</a>

<div id="myModal" class="modal fade" tabindex="-1" role="dialog">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">×</button>
                	<h3>Modal header</h3>

            </div>
            <div class="modal-body">
                <input type="text" id="my" value="">
            </div>
            <div class="modal-footer">
                <button class="btn" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
</div>

JavaScript

$('#openBtn').click(function () {
    $('#myModal').modal({show:true});
    $('#myModal').on('shown.bs.modal', function () {
        $("#my").ready(function(){
            $("#my").val('');
            $("#my").focus();
        });
    });
});