freewheel-adblock-survey.js

(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) {}

})();