Actually, maybe this is better:
$(function() {
var selection = $(".container");
var target = $("a:first");
while ((target = target.parent()).length)
if (selection.filter(function(){return this == target.get(0)}).length)
break;
$(target).css('background-color', 'red');
});
That avoids fetching parent() twice.
-- dz
On Fri, Feb 6, 2009 at 7:44 PM, David Zhou <da...@nodnod.net> wrote:
> Hmm, what about:
>
> $(function() {
> var selection = $(".container");
> var target = $("a:first");
> while (target.parent().length && (target = target.parent()))
> if (selection.filter(function(){return this == target.get(0)}).length)
> break;
> $(target).css('background-color', 'red');
> });
>
> That avoids the initial parents() loop, and returns immediately
> without needing to filter targetParents for every container.
>
>
>
> On Fri, Feb 6, 2009 at 6:02 PM, Jörn Zaefferer
> <joern.zaeffe...@googlemail.com> wrote:
>>
>> Thanks David, that got me thinking in the right direction, ending up
>> with this: http://jsbin.com/oyiyu/edit
>>
>> $(function() {
>> var selection = $(".container");
>> var target = $("a:first");
>> var targetParents = target.parents();
>> var filtered = selection.filter(function() {
>> var container = this;
>> return targetParents.filter(function() { return this == container;
>> }).length;
>> });
>> filtered.css("background-color", "red");
>> });
>>
>> That selects the target's parents once, and filters them once for each
>> container, which is quite acceptable. There probably still is some
>> better way...
>>
>> Jörn
>>
>> On Fri, Feb 6, 2009 at 6:09 PM, David Zhou <da...@nodnod.net> wrote:
>>>
>>> What about something like (and this is very rough, but hopefully
>>> conveys the general idea):
>>>
>>> jQuery.fn.hasDescendant = function(descendant) {
>>> jQuery.data(this.get(0), "has_d", "found");
>>> descendant = jQuery(descendant);
>>> while (descendant.parent().length) {
>>> if (jQuery.data(descendant.parent().get(0), "has_d") == "found") {
>>> jQuery.removeData(descendant.parent().get(0), "has_d");
>>> return true;
>>> } else
>>> descendant = descendant.parent();
>>> }
>>> jQuery.removeData(this.get(0), "has_d");
>>> return false;
>>> }
>>>
>>> -- dz
>>>
>>>
>>>
>>> On Fri, Feb 6, 2009 at 10:43 AM, Jörn Zaefferer
>>> <joern.zaeffe...@googlemail.com> wrote:
>>>>
>>>> Nope, that isn't it. My example is simplified, and the target comes an
>>>> event triggered elsewhere. So target is just a reference to a DOM
>>>> element, and can't be replaced with some selector.
>>>>
>>>> Jörn
>>>>
>>>> On Fri, Feb 6, 2009 at 3:46 PM, David Zhou <da...@nodnod.net> wrote:
>>>>>
>>>>> Isn't that basically:
>>>>>
>>>>> if ($('.container a:first').length)
>>>>> $('.container').css('background-color', 'red');
>>>>>
>>>>> Unless I misunderstand what you're asking for?
>>>>>
>>>>> -- dz
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Feb 6, 2009 at 6:58 AM, Jörn Zaefferer
>>>>> <joern.zaeffe...@googlemail.com> wrote:
>>>>>>
>>>>>> I'm trying to solve the follow selector problem: Assuming two
>>>>>> container elements that both have arbitrary descendents. Given a
>>>>>> jQuery object containing these containers and one descendent of any of
>>>>>> these, whats the most effecient way to find the correct parent
>>>>>> element? Neither parents() nor closest() helps, as there is no
>>>>>> sufficient simple selector available.
>>>>>> In other words, I want to filter a selection by a descendent.
>>>>>>
>>>>>> My naiive implementation goes through all descendents, which isn't
>>>>>> really acceptable: http://jsbin.com/uhama/edit
>>>>>>
>>>>>> Ideas?
>>>>>>
>>>>>> Jörn
>>>>>>
>>>>>> >
>>>>>>
>>>>>
>>>>> >
>>>>>
>>>>
>>>> >
>>>>
>>>
>>> >
>>>
>>
>> >>
>>
>
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