function bindEvent(element, eventName, eventHandler) {
            if (element.addEventListener) {
                element.addEventListener(eventName, eventHandler, false);
            } else if (element.attachEvent) {
                element.attachEvent('on' + eventName, eventHandler);
            }
        }

var sendMessage = function (msg) {
            // Make sure you are sending a string, and to stringify JSON
            window.parent.postMessage(msg, '*');
        };


document.querySelectorAll('#email')[0].addEventListener('click', function(event) {
var messageButton = document.querySelectorAll('button.spinBtn')[0];

        // Send random message data on every button click
        bindEvent(messageButton, 'click', function (e) {
            var email = document.querySelectorAll('#email')[0].value
            sendMessage('' + email);
        });

});