IE8: jQuery.isPlainObject( document.location ) throws an Invalid Pointer exception

[jaubourg]

Found this one when the document.location test in test/unit/ajax.js failed.

jQuery.isPlainObject( document.location ) throws an Invalid Pointer exception in IE8. The inspector shows that document.location.constructor is an Invalid Pointer and as such cannot be accessed at all.

I suspect document.location is not the only variable with that issue so adding object !== document.location as a safeguard doesn't seem like an option.

[jaubourg]

Seems it's even more complicated than this. See: ​http://jsfiddle.net/vZ6xf/

When you load the page, jQuery.isPlainObject( document.location ) returns true. When you click "Run", it throws an exception.

Probably something to do with the cache.

Gotta love IE.

[jaubourg]

So, in short, we could try/catch and return false, except the first time atound, it won't throw an exception and return true.

[jaubourg]

Ben Alman doesn't seem to have an exception thrown at him using an XP VM with IE 8.0.6001.18372. I'm using IE 8.0.6001.18975 on Vista (no VM).

[cowboy]

Also, FWIW, window.location or just location should be preferred to document.location.

[dmethvin]

IE 8.0.7600.16385 on Windows 7, alerts "true" both times with no crash.

[snover]

I’m not able to reproduce this issue. XP SP3 8.0.6001.18702. jaubourg, are you sure your IE is up to date?

[jaubourg]

@snover: like I said, 8.0.6001.18975. Vista does not propose any update.

Even if the crash is a temporary IE bug OR a Vista problem OR a jaubourg's Vista problem (who knows? ;) ), fact is it returns true for everybody else, which it shouldn't.

[Rick Waldron]

There is a large issue with $.isPlainObject(), I'm closing this ticket. Please refer to #7780