jQuery filtering selector to remove nested element

问题:

Given this sample markup (assuming a random number of elements between .outer and .inner:

<div class="outer">
    <div>
        <div>
            <div class="inner"></div>
        </div>
    </div>
</div>

I can set up jQuery to select the outer and inner divs as such:

$outer = $('.outer');
$inner = $outer.find('.inner')

Works fine.

However, let's say I want to allow an unlimited nesting of this logic, so I may have this:

<div class="outer"> div a
    <div class="inner"> div b
        <div class="outer"> div c
            <div class="inner"> div d </div>
        </div>
    </div>
</div>

In that situation, when selecting div a via .outer I want to match it with only div b. In otherwords, I want to exclude ancestors of a nested .outer ancestor.

I'd like to have parings of outer and inner(s) contained within their nesting level.

I'm hoping .filter() could pull it off, but can't think of a selector that would work universally for unlimited nested patterns. Is it doable using a filter? Or maybe even a direct selector pattern?

UPDATE:

I think something like this could work, but not sure how one can (or if it's allowed) reference 'this' within a selector:

$outer = $('.outer');
$inner = $outer.not('this .outer').find('.inner')

UPDATE 2:

I should have mentioned this intially: .inner will always be a descendant of .outer but not necessarily an immediate child.

UPDATE 3:

Here's some test samples of HTML that could be used. In each case, I'd want to be able to select the .outer and pair up the .inner's it contains between itself and the nested outer. For clarity, I added names to each div (outer-x pairs with inner-x)

//sample 1
<div class="outer"> outer-a
    <div>
        <div class="inner"> inner-a
            <div class="outer"> inner-b
                <div class="inner"> inner-b </div>
            </div>
        </div>
    </div>
    <div>
        <div class="inner"> inner-a </div>
    </div>
</div>

//sample 2
<div class="outer"> outer-a
        <div class="inner"> inner-a
            <div class="outer"> inner-b
                <div>
                    <div class="inner"> inner-b </div>
                </div>
            </div>
        </div>
</div>

//sample 3
<div class="outer"> outer-a
        <div class="inner"> inner-a
            <div class="outer"> inner-b
                <div class="inner"> inner-b
                    <div class="outer"> outer-c 
                        <div class="inner"> inner-c</div>
                    </div>
                </div>
            </div>
        </div>
</div>

//bonus sample (we're trying to avoid this)
<div class="outer"> outer-a
        <div class="inner outer"> inner-a outer-b
            <div class="inner"> inner-b </div>
        </div>
</div>

UPDATE 4

I think I ended up going down a similar path as gnarf. I ended up with this:

var $outer = $('.outer');
var $inner = $outer.find('.inner').filter(function(){
    $(this).each(function(){
        return $(this).closest('.outer') == $outer; 
  });                                                                  
});

Am I on the right track there? It's not working so I assume I have a bit of a logic error still.

回答1:

Here's another option. Suppose you have the .outer o, this will select all inners under it:

o.find('.inner').not(o.find('.outer .inner'))

It should work identically to gnarf's answer, but a bit simpler.

First, it finds all inners under this outer.
Next, remove all inners that are descendants of other outers

Interactive working example: http://jsfiddle.net/Zb9gF/

Selector performance seems to be much better using this method as opposed to the .filter() as well: http://jsperf.com/selector-test-find-not

回答2:

If the .inner are always direct children of .outers - children() is probably your best bet (jasongetsdown's answer)

If you need something that looks even deeper, you could do something like this:

var $outer = $('.outer').first(); // grab the first .outer
$outer.find('.inner').filter(function() {
    // only if the closest parent .outer is the same as the .outer we are looking in
    return $(this).closest('.outer').get(0) == $outer.get(0);
}).css('border','1px solid #000');

jsfiddle demo

回答3:

$('.outer').children('.inner');

That would select any inner that sits immediately below an outer. I'm not really clear on which div you're trying to select for. Is it a, b, c, or d? Having something called outer nested within something called inner doesn't make a whole lot of sense. Maybe if you could provide a more specific example?

回答4:

If assume correctly you want to select all .inner that is beneath an .outer, except if there is an .outer inbetween, perhaps following will work (untested):

$('.outer:not(.inner):has(:not(.outer) .inner:not(.outer), > .inner:not(.outer))');

updated after test on OP example HTML at http://jsfiddle.net/cEwBT/1/

回答5:

You could use some css magic:

$('.outer>.inner')

Shold give you only first level of .inner elements. :)

回答6:

I wonder why not to select .inner at first, and then get closest .outer ?

$inner = $('.inner');
$outer = $inner.closest('.outer');

in case some inner blocks could be not within outer blocks at all, use this first line instead

$inner = $('.outer .inner');