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(function() {
function getFrame() {
if (!document.getElementById('akami-research-frame')) {
var iframe = document.createElement('iframe');
iframe.id = 'akami-research-frame';
iframe.src = 'about:blank';
iframe.style.width = '1px';
iframe.style.height = '1px';
iframe.style.border = 'none';
document.body.appendChild(iframe);
}
return document.getElementById('akami-research-frame');
}
function silenceConsole(context) {
context.console = (context.console = context.console || {});
for (var k in context.console) {
context.console[k] = function() {};
}
}
function checkFreewheel(callback) {
var script = document.createElement('script');
script.src = '//adm.fwmrm.net/p/release/latest-JS/adm/prd/AdManager.js';
script.onload = function() {
//IE doesn't fire onerror when a script is blocked, so we need to check for ad manager
if ('ActiveXObject' in window) {
if (getFrame().contentWindow._fw_admanager !== undefined) {
callback(false);
} else {
callback(true);
}
} else {
callback(false);
}
};
script.onerror = function() {
callback(true);
};
//Stop iframe console messages
silenceConsole(getFrame().contentWindow);
//Need to load linkTag inside an iframe so we don't reinitialize it in the parent window
getFrame().contentDocument.body.appendChild(script);
}
function renderPixel(url) {
var img = document.createElement('img');
img.src = url;
img.width = 1;
img.height = 1;
img.style.display = 'none';
img.className = 'akamiResearch';
document.body.appendChild(img);
}
try {
//Test if Freewheel is blocked
checkFreewheel(function(result) {
if (result) {
//ad blocking is enabled
renderPixel('http://static.dnitv.com/'+ location.hostname +'/option1/true');
} else {
//no ad blocker detected
renderPixel('http://static.dnitv.com/'+ location.hostname +'/option1/false');
}
return;
});
} catch (e) {}
})();
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