找出元素是否为另一个元素的后代的最佳方法 [英] Best way to find out if element is a descendant of another
问题描述
我正在实现jQuery,并在我的代码库中删除Prototype库,我想知道是否可以给我最好的方法来在jQuery中实现此功能.
我熟悉jQuery ancestor >
descendant语法,但是只想检查一个元素是否是true或false的后代,例如下面的代码:
有人可以为此给我最有效的jQuery解决方案吗?
I am in the process of implementing jQuery, and taking out Prototype libraries in my codebase, and I am wondering if you could give me the best way to implement this functionality in jQuery.
I am familiar with the jQuery ancestor>
descendant syntax, but just want to check if an element is a descendant by true of false, like the code below:
can someone give me the most efficient jQuery solution for this ?
<div id="australopithecus">
<div id="homo-herectus">
<div id="homo-sapiens"></div>
</div>
</div>
$('homo-sapiens').descendantOf('australopithecus');
// -> true
$('homo-herectus').descendantOf('homo-sapiens');
// -> false
推荐答案
我认为您可以在这里利用CSS样式选择,并返回长度..
I would think you could take advantage of CSS style selection here, with returned length..
$('#australopithecus #homo-sapiens').length // Should be 1
$('#homo-sapiens #homo-herectus').length // Should be 0
并非完全正确/错误,但是将0/1作为布尔值进行检查应该可以. :)
Not exactly true/false, but checking 0/1 as a boolean should work. :)
或者,您可以执行类似$('#parent').find('#child')的操作,并检查其中的长度.
Alternately, you could do something like $('#parent').find('#child') and check the length there.
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