zIndex > 999999 and modal = true "disables" checkboxes in FF

[sebeers]

In FireFox only, combining modal = true with zIndex > 999999 virtually disables checkboxes appearing inside the dialog - i.e. they always return to their prior state when clicked.

Demo: ​http://jsfiddle.net/FFtVC/ (Note difference in change handler execution)

Occurs under Windows XP, Windows Vista, Windows 7 with FF versions 6.0.2 and 5.0.1

[maciejmrozinski]

Opera 12.00 and IE 8 works well (IE fires change event first, then click, but this doesn't matter), so it must be FF related problem. I also noticed that this bug doesn't affect only checkboxes, but normal inputs too. I think it will be problem with all type of inputs and maybe other tags. Forked demo with input here: ​http://jsfiddle.net/AEYHV/1/

[maciejmrozinski]

this ticket is related to #7107 or even duplicates it

[maciejmrozinski]

This is not jQuery UI bug, it's not even jQuery bug. Native Firefox getComputedStyle() function (which jQuery uses to get css values when possible) returns bad values. Big numbers like > 1000000 will be affected with bad calculated value (this ticket) and even greater numbers like 2147483583 will be returned in bad notation (ticket #7107). If we read zIndex from native style object of element we will get good values. This is possible fix for jQuery. I will try to commit it in jQuery repo.

[Scott González]

What maciejmrozinski said. Also that value is insanely high, you should use sane values for z-index.