#5557 closed bug (fixed)

Opened April 27, 2010 06:22PM UTC

Closed April 28, 2010 02:43AM UTC

Last modified May 20, 2010 11:14AM UTC

Comparing element.nodeName directly against upper case tag names can cause problems

Reported by: complex Owned by:
Priority: minor Milestone: 1.8.2
Component: ui.accordion Version: 1.8
Keywords: nodeName comparison case sensitivity sensitive lower upper ul Cc:
Blocked by: Blocking:
Description

Environment

Firefox 3.0.19

jQuery 1.4.2

jQueryUI 1.8

Issue

Just found this in jquery.ui.accordion.js (accidentally):

if (this.element[0].nodeName == "UL")

According to my past experience it is not good this way, since nodeName can be lower case sometimes, depending on the type of the document and maybe on the browser, I'm not sure. It is error prone this way, I'd suggest:

if (this.element[0].nodeName && this.element[0].nodeName.toLowerCase() == "ul")

Can you come up with a better solution?

(I've just found many instances of similar direct nodeName comparison issues in the DataTables plugin a few minutes ago and searched my code base as a whole for similar issues. I found the above line in jQuery UI this way. So I can't reproduce it, but I observed that the nodeName of a <td> element is "td" on my browser instead of "TD", so it should be the same for "UL" as well.)

Attachments (0)
Change History (3)

Changed April 27, 2010 06:28PM UTC by complex comment:1

Additional information

This problem seems to happen only when the element in question is generated by JavaScript code. It happened in the case of my DataTable instance and applying the above toLowerCase() fix solved that issue.

Changed April 28, 2010 02:43AM UTC by scottgonzalez comment:2

milestone: TBD → 1.9
resolution: → fixed
status: new → closed

Fixed in 0aa4c7f by just removing the check. Since we're already filtering the children to li's, we don't need to check the type. But to answer your question, the best way to do this is to use .is( "ul" ).

Changed May 20, 2010 11:14AM UTC by rdworth comment:3

milestone: 1.9 → 1.8.2