Hi Guys,

We have a DNN 7.3.4 installation (also present in 7.3.2) and we have stumbled on a bug. When we open a page in IE11 we get a JS error that reads attachEvent is undefined (screenshots below). In our installation the error originates in ScriptResource.axd (I think it comes from Telerik).

The same issue appears when you open www.dnnsoftware.com in IE11 what may indicate this is a DNN bug (dnncore.js).

It looks that this error occures because  attachEvent was removed from IE and therfore JS events can't be bound.
I found that the error is kind of mentioned here: https://dnntracker.atlassian.net/browse/DNN-3740 but we still get it after the upgrade to 7.3.4

Do you know if there's anything we could do ourselvs to work around it?

Please let me know if I can help to find a solution.

Thanks,
Lukasz

Screenshots:
https://dl.dropboxusercontent.com/u/7054316/Error-1-img1.jpg
https://dl.dropboxusercontent.com/u/7054316/Error-1-img2.jpg
https://dl.dropboxusercontent.com/u/7054316/Error-2-img1.jpg
https://dl.dropboxusercontent.com/u/7054316/Error-2-img2.jpg

Hi Cathal,

That's interesting.

Yes I did that as one of the first things. I forced the browser to clrear scripts by hitting CTRL + F5, but unfortunatelly that did no difference. The details are below.

I've tried www.dnnsoftware.com on three different computers with the same results.

PC 1 IE11 v 11.0.12 (11.0.9600.17280) on Windows 7 Service Pack 1
PC 2 IE11 v 11.0.15 (11.0.9600.17501) on Windows 7 Service Pack 1
Server IE11 v 11.0.15 (11.0.9600.17501) on Windows Web Server 2008 R2 Service Pack 1

Issiue on www.dnnsoftware.com comes from file dnncore.js and that's the exact code which produces the error:
(sorry for the formatting but this is a compressed/minified file)

function __dnn_Page_ (){if(__dnn_ClientAPIEnabled()){dnn.dom.attachEvent(window,"onscroll",__dnn_bodyscroll)}__dnn_m_bPageLoaded=true}

Issue on our website is on a click event. Below are details from Visual Studio on PC 1 IE11 v 11.0.12 (11.0.9600.17280) on Windows 7 Service Pack 1

/* START MicrosoftAjaxWebForms.js */
// (c) 2010 CodePlex Foundation
(...)
if(Sys.Browser.agent===Sys.Browser.InternetExplorer){var k=document.createElement("a");k.style.display="none";k.attachEvent("onclick",H);k.href=e.content;h._form.parentNode.insertBefore(k,h._form);k.click();k.detachEvent("onclick",H);h._form.parentNode.removeChild(k);

Call stack:
	e.prototype._parseDelta [Telerik.Web.UI.WebResource.axd] Line 9	Script
 	e.prototype._onFormSubmitCompleted [Telerik.Web.UI.WebResource.axd] Line 9	Script
 	Anonymous function [Telerik.Web.UI.WebResource.axd] Line 3	Script
 	Anonymous function [Telerik.Web.UI.WebResource.axd] Line 3	Script
 	d [Telerik.Web.UI.WebResource.axd] Line 3	Script
 	w.prototype.completed [Telerik.Web.UI.WebResource.axd] Line 3	Script
 	f._onReadyStateChange [Telerik.Web.UI.WebResource.axd] Line 3	Script

Can you please advise.

Thanks,
Lukasz