Infinite loop in trigger function when window.parentNode is a DOM element

[anonymous]

The code at fault is:

cur = cur.parentNode || cur.ownerDocument || cur === event.target.ownerDocument && window;

The cur variable walks the DOM tree, then becomes the Document object en then the window object. When window has a parentNode variable, an infinite loop starts.

Forgetting to declare a temporary parentNode variable so it ends up in the window object is a client programmer error, but jQuery should not choke on it.

[dmethvin]

Hmmm, good point. We are using another browser sniff for a setInterval property to determine if something is a window, we can check for that, or perhaps checking for cur.nodeType===1 would be better.

In the meantime, don't declare a global with the name parentNode!

[dmethvin]

To continue my internal dialog, we don't want to check for .nodeType===1 because someone may be depending on plain objects to bubble ... not that we formally support it, but I discussed the possibility with Yehuda a few months back. So a window test may be our best bet.

[dmethvin]

Trigger was refactored and fixed here:  https://github.com/jquery/jquery/commit/ecd10464e8659b008e52161cc029f9d6863e33b3