<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <label for="chkPassport"> <input type="checkbox" id="chkPassport" /> Do you have Passport? </label> <hr /> <div id="dvPassport" style="display: none"> Passport Number: <input type="text" id="txtPassportNumber" /> </div>

$(function () { $("#chkPassport").click(function () { if ($(this).is(":checked")) { $("#dvPassport").show(1000); } else { $("#dvPassport").hide(2000); } }); });