Bug Tracker

#4655 closed bug (invalid)

Opened May 13, 2009 09:21AM UTC

Closed May 14, 2009 12:11AM UTC

is function wrong with :first, :last, :last-child

Reported by: tigerf Owned by: john
Priority: major Milestone: 1.4
Component: selector Version: 1.3.2
Keywords: is last first Cc:
Blocked by: Blocking:
Description

I have some code that result is not match expectation.

html:

 <span>1</span><span>2</span><span>3</span>

script:

 $('span:eq(0)').is('span:first') // yes, it is true
 $('span:eq(2)').is('span:first') // expect false but true

 $('span:eq(2)').is('span:last') // yes, it is true
 $('span:eq(0)').is('span:last') // expect false but true

 $('span:eq(0)').is('span:first-child') // yes, it is true
 $('span:eq(2)').is('span:first-child') // yes, it is false

 $('span:eq(2)').is('span:last-child') // expect true but false
 $('span:eq(0)').is('span:last-child') // yes, it is false

BTW: I don't know what is different between :first and :first-child.

Attachments (0)
Change History (1)

Changed May 14, 2009 12:11AM UTC by dmethvin comment:1

resolution: → invalid
status: new → closed

These are good things to explore with other users in a forum. Please don't file a bug report until you are sure it's a bug.

The 

.is()
method takes its context from the collection of nodes it is given, similar to 
.filter()
. (The docs note this relationship.) If the filter expression yields at least one element, 
.is()
returns true.

Your examples are all selecting a single span, so 

:first
and 
:last
will be true. You aren't showing the complete markup, so I don't know whether the 
:*-child
should return true or false.