Donation Form AJAX JQuery

HTML

<script src="https://checkout.stripe.com/checkout.js"></script>
<div class="results"></div>
<form id="myForm">
    <p><label for="message">Enter some message</label>
    <input type="text" id="message" value="Hello, world"/></p>
    <p><label for="amount">Enter some amount</label>
    <input type="text" id="amount" value="10.00" /></p>
    <label><input type="checkbox" id="checkbox" />Click my cool checkbox</label>
    <p><button type="submit" id="customButton">Pay</button></p>
</form>

CSS

button,input { font-size:1.5em; padding:10px; }
label { display:block; }

JavaScript

// check if the amount entered is a valid dollar amount 
var isDollarAmt = function(amt) {
    // matches nnnn.nn
    var regex = /^\d+(\.\d{0,2})?$/;
    return regex.test(amt.replace(/ /g, ''));
}

// checkout handler
var handler = StripeCheckout.configure({
    key: 'pk_test_6pRNASCoBOKtIshFeQd4XMUh',
    image: '/img/documentation/checkout/marketplace.png',
    token: function(token) {
        /* Use the token to create the charge with a server-side script.
         You can access the token ID with `token.id`
        
         Pass along various parameters you get from the token response
         and your form.
        */
        var myData = {
                token: token.id,
                email: token.email,
                amount: Math.round($("#amount").val() * 100),
                checkbox: $("#checkbox").val(),
                message: $("#message").val()
        };

        /* 
         Make an AJAX post request using JQuery,
         change the first parameter to your charge script
        */
        $.post("/echo/html/",myData,
            function(data) {
            
            // if you get some results back update results
            $("#myForm").hide();
            $(".results").html("Your charge was successful");
            
            // for demonstration purposes, loop through everything in myData
            for (var key in myData) {
              $(".results").append("<br />"+key+":"+myData[key]);
            }
            }).fail(function() {
            // if things fail, tell us
            $(".results").html("I'm sorry something went wrong");
        })
    }
});

$('#myForm').on('submit', function(e) {

    // is dollar amount valid, open check out
    if (isDollarAmt($("#amount").val())) {
        // Open Checkout with further options
        handler.open({
            name: 'Stripe.com',
            description: '2 widgets',
	          amount: Math.round($("#amount").val() * 100),
        });
        
    } 
    // if not throw...