Braintree dropin container is not populating

Trying to do this in ejs, Only fields which i give is visible it is not populating textbox for card number and exp date.

 <form method="post" action="/checkout" id="checkout">

    <input type="text" id="amount" name="amount"/>
    <div id="payment"></div>

    <input type="submit" value="pay"/>

 </form>
 <script src="https://js.braintreegateway.com/js/braintree-2.32.0.min.js"></script>
<script>
braintree.setup(<%=clientToken%>, "dropin", {
      container: "payment"
    });
</script>

I tried to place braintree js file inside public/js folder also but not working.Anyone has any suggestions.Thanks in advance.

via karthik