elledecor/1stdibs cross-frame helper code

helper.html

<!-- 
* 1stdibs cross-domain iframe helper 
* put this near the top of the page
-->
<script type="text/javascript">
    (function () {
        // SET DOCUMENT.DOMAIN FOR CROSS-FRAME COMMUNICATION
        var domain = document.location.hostname.split('.');

        document.domain =  domain[domain.length-2] + '.' + domain[domain.length-1];
    }());
</script>

<!-- 
* 1stdibs iframe navigation helper 
* load after jQuery
-->
<script type="text/javascript">
    jQuery(function ($) {
    
        // NAVIGATE DIBS IFRAME
        var dibsSubDomain = '1stdibs.lookbook.',
            search = document.location.search,
            path = search.charAt(0) === '?' ? search.slice(1, search.length) : search,
            loc = document.location.protocol + '//' + dibsSubDomain  + document.domain + '/' + decodeURIComponent(path),
            dibsFrameElem = $("#dibsElledecorIframe").get(0);

        // load dibs URL in dibs iframe
        dibsFrameElem.src = loc;
    
        // SUPPORT 1STDIBS KEYBOARD NAVIGATION
        var dibsFrameDoc = window.frames['dibs'],
            keyMap = {
                '13': 'RETURN',
                '37': 'LEFT',
                '38': 'RIGHT',
                '39': 'RIGHT',
                '40': 'DOWN'
            };

        $('body').keydown(function (e) {
            if (dibsFrameDoc.HotKey && dibsFrameDoc.HotKey.hotkeys) {
                var hotkeyInstance = dibsFrameDoc.HotKey.hotkeys.find(function (hotkey) {
                    return hotkey.letter === keyMap[e.which.toString()];
                });
                if (hotkeyInstance && hotkeyInstance.trigger) {
                    hotkeyInstance.trigger();
                }
            }
        });
    });
</script>