'projectTaskButtonAppName' is undefined when clicking List tab in Ribbon

Question

I am getting the following Javascript error when clicking on the List tab in the SP2010 ribbon for a Project Task list that I have placed into a webpart on the default.aspx page:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3) Timestamp: Tue, 5 Jul 2011 20:32:33 UTC

Message: 'projectTaskButtonAppName' is undefined Line: 1302 Char: 9 Code: 0 URI: http://sptest/_layouts/sp.ribbon.debug.js?rev=lc6eCMZP6gL5LnuSYh0S6Q%3D%3D

I have searched quite extensively and have not found any other complaints..

Does anyone have any idea what I can check? I do not have MS Project on my machine, but surely that wouldn't break the JS.

Answer 1

The Ribbon icons are grayed out but still Active/useable. If you click elsewhere, they tend to come back to life with color. Appears to be a SP Bug/scripting error that has a workaround.

Answer 2

I solved the problem by adding a try catch to the JS that was breaking. I made the following change to SP.Ribbon.debug.js: Line 1302-

    try{    
    return !eval($v_0.HiddenScript);
    }
    catch(e){
    return true;
    }

Now the ribbon buttons are at least usable. I think I'll have to make this same change in SP.ribbon.js .

Perhaps this is due to me not having MS Project installed on my box.

Anyway hope this helps some other poor soul as well.

Answer 3

I've notice this issue occurs when you change the Toolbar.Type from "Standard" to "None" on the XsltListViewWebPart

Answer 4

I had the same problem with my project task list. In order to get rid of this problem i tested different web part settings for project task list. The option that worked for me was setting Toolbar type to: Full Toolbar.