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#4915 closed bug (invalid)

Opened July 17, 2009 08:34PM UTC

Closed October 02, 2009 01:40AM UTC

Setting Style object measurement property to 'NaNpx' in IE

Reported by: Damon Owned by:
Priority: major Milestone: 1.3.2
Component: core Version: 1.3.2
Keywords: Cc:
Blocked by: Blocking:

This bug has been widely reported on the net. See

for an example discussion, including a code fix at the very bottom.

The issue, as we understand it, is that when jQuery is accessing a hidden element (CSS display property set to none) in IE, it produces 'NaNpx' as a measurement. For us, it was the lineHeight property on a hidden form select that we were populating using that element's .html method. (Using $.loadJson to construct option elements that we dumped in via .html.)

The error occurs in line 1061 of jquery-1.3.2.js.

if ( set ) {

event[name] = value

The fix is to check for value=='NaNpx' and, if so, change value to a blank string.

if ( set ) {

if (value=='NaNpx'){value = ''}

event[name] = value

For what it's worth, the listserv post I linked above recommended patching the minimized version of jquery-1.3.2 the same way.

search for this

return N.toUpperCase()});if(L){

insert this


//before this

J[G]=K}return J[G]}


return N.toUpperCase()});if(L){if(K=='NaNpx'){K=''}J[G]=K}return J[G]}

Attachments (0)
Change History (2)

Changed July 21, 2009 02:16AM UTC by dmethvin comment:1

Can you provide a test case? The thread referenced doesn't have one.

Changed October 02, 2009 01:40AM UTC by dmethvin comment:2

resolution: → invalid
status: newclosed

I'm closing this for lack of a test case. A "NaNpx" is an incorrect value to use for a css measurement. jQuery shouldn't be trying to screen out invalid values passed by the caller.