function dnTicketingRefresh(callback) {
    var dn_ticket_boxes = document.getElementsByClassName("diginights-ticketshop-box");

    var i;

    for (i = 0; i < dn_ticket_boxes.length; i++) {
        var box = dn_ticket_boxes[i];

        if (box.innerHTML.replace(/&nbsp;/gi, '').trim() === "") {
            var iframe = document.createElement('iframe');
            var random = Math.floor((Math.random() * 10000) + 10000);
            var iframe_id = "dn-iframe-" + random;

            var identifier = typeof box.dataset.uuid !== "undefined" ? box.dataset.uuid : box.dataset.event;

            var shoplink = "https://diginights.com/ticketshop/eventslug/step/1".replace("eventslug", identifier) + "?iframeid=" + random;

            if (typeof box.dataset.design !== "undefined") {
                shoplink = shoplink + '&design=' + box.dataset.design;
            }

            if (typeof box.dataset.queryparams !== "undefined") {
                shoplink = shoplink + '&' + box.dataset.queryparams;
            }

            if (typeof box.dataset.lang !== "undefined") {
                shoplink = shoplink.replace("/ticketshop/", "/" + box.dataset.lang + "/ticketshop/");
            }

            iframe.frameBorder = 0;
            iframe.scrolling = "no";
            iframe.id = iframe_id;
            iframe.width = "100%";
            iframe.style.border = "0px";
            iframe.setAttribute("src", shoplink);

            box.appendChild(iframe);
        }
    }
    if (callback) callback();
}

if (document.readyState) {
    dnTicketingRefresh();
} else {
    window.addEventListener('load', function() {
        dnTicketingRefresh();
    });
}

if (typeof eventTicket == 'undefined') {
    var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
    var eventTicket = window[eventMethod];
    var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";
    eventTicket(messageEvent, function (e) {
        if ('https://diginights.com' === e.origin) {
            if ('rs' === e.data[0] && parseInt(e.data[2]) && document.getElementById("dn-iframe-" + e.data[1])) document.getElementById("dn-iframe-" + e.data[1]).height = e.data[2] + "px";
            if ('st' === e.data[0] && document.getElementById("dn-iframe-" + e.data[1])) document.getElementById("dn-iframe-" + e.data[1]).scrollIntoView();
        }
    }, false);
}