var addIframe = function()

in public/js/iframe-boot.js [1:73]
58 lines of code
9 McCabe index (conditional complexity)

var addIframe = function (el, context, config, mediator) {
        // Extract href of the first link in the content, if any
        var iframe;
        var link = el.querySelector('a[href]');

        function _postMessage(message) {
            iframe.contentWindow.postMessage(JSON.stringify(message), '*');
        }

        if (link) {
            iframe = document.createElement('iframe');
            iframe.style.width = '100%';
            iframe.style.border = 'none';
            iframe.height = '500'; // default height
            iframe.src = window.location.protocol === 'https:' ? link.href.replace(/^http\:/, 'https:') : link.href;

            // Listen for requests from the window
            window.addEventListener('message', function(event) {
                if (event.source !== iframe.contentWindow) {
                    return;
                }

                // IE 8 + 9 only support strings
                var message = JSON.parse(event.data);

                // Actions
                switch (message.type) {
                    case 'set-height':
                        iframe.height = message.value;
                        break;
                    case 'navigate':
                        document.location.href = message.value;
                        break;
                    case 'scroll-to':
                        window.scrollTo(message.x, message.y);
                        break;
                    case 'get-location':
                        _postMessage({
                            'id':       message.id,
                            'type':     message.type,
                            'hash':     window.location.hash,
                            'host':     window.location.host,
                            'hostname': window.location.hostname,
                            'href':     window.location.href,
                            'origin':   window.location.origin,
                            'pathname': window.location.pathname,
                            'port':     window.location.port,
                            'protocol': window.location.protocol,
                            'search':   window.location.search
                        }, message.id);
                        break;
                    case 'get-position':
                        _postMessage({
                            'id':           message.id,
                            'type':         message.type,
                            'iframeTop':    iframe.getBoundingClientRect().top,
                            'innerHeight':  window.innerHeight,
                            'innerWidth':   window.innerWidth,
                            'pageYOffset':  window.pageYOffset
                        });
                        break;
                    default:
                       console.error('Received unknown action from iframe: ', message);
                }
            }, false);

            // Replace link with iframe
            // Note: link is assumed to be a direct child
            el.replaceChild(iframe, link);
        } else {
            console.warn('iframe-wrapper applied to element without any link');
        }
    };