Javascript 如何在 jQuery 中获取元素的第 n 级父级?
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How do I get the n-th level parent of an element in jQuery?
提问by Artur Keyan
When I want to get, for example, the 3rd level parent of the element I must write $('#element').parent().parent().parent()
Is there a more optimal method for this?
例如,当我想获得必须编写的元素的第 3 级父级时,$('#element').parent().parent().parent()
是否有更优化的方法?
回答by Frédéric Hamidi
回答by Henry
Depends on your needs, if you know what parent your looking for you can use the .parents() selector.
取决于你的需要,如果你知道你在寻找什么父母,你可以使用 .parents() 选择器。
E.G: http://jsfiddle.net/HenryGarle/Kyp5g/2/
EG:http: //jsfiddle.net/HenryGarle/Kyp5g/2/
<div id="One">
<div id="Two">
<div id="Three">
<div id="Four">
</div>
</div>
</div>
</div>
var top = $("#Four").parents("#One");
alert($(top).html());
Example using index:
使用索引的示例:
//First parent - 2 levels up from #Four
// I.e Selects div#One
var topTwo = $("#Four").parents().eq(2);
alert($(topTwo ).html());
回答by Joseph Marikle
You could give the target parent an id or class (e.g. myParent) and reference is with $('#element').parents(".myParent")
你可以给目标父级一个 id 或类(例如 myParent),并且引用是 $('#element').parents(".myParent")
回答by a'r
A faster way is to use javascript directly, eg.
一种更快的方法是直接使用 javascript,例如。
var parent = $(innerdiv.get(0).parentNode.parentNode.parentNode);
This runs significantly faster on my browser than chaining jQuery .parent()
calls.
这在我的浏览器上运行速度比链接 jQuery.parent()
调用快得多。
回答by Dane
Didn't find any answer using closest()
and I think it's the most simple answer when you don't know how many levels up the required element is, so posting an answer:
You can use the closest()
function combined with selectors to get the first element that matches when traversing upwards from the element:
使用没有找到任何答案closest()
,我认为这是最简单的答案,当您不知道所需元素的级别有多少时,因此发布答案:
您可以使用该closest()
函数与选择器相结合来获取匹配的第一个元素当从元素向上遍历时:
('#element').closest('div') // returns the innermost 'div' in its parents
('#element').closest('.container') // returns innermost element with 'container' class among parents
('#element').closest('#foo') // returns the closest parent with id 'foo'
回答by zatatatata
It's simple. Just use
这很简单。只需使用
$(selector).parents().eq(0);
where 0 is the parent level (0 is parent, 1 is parent's parent etc)
其中 0 是父级(0 是父级,1 是父级的父级等)
回答by ashishyadaveee11
If you have a common parent div you can use parentsUntil() link
如果你有一个共同的父 div 你可以使用 parentsUntil()链接
eg: $('#element').parentsUntil('.commonClass')
例如: $('#element').parentsUntil('.commonClass')
Advantage is that you need not to remember how many generation are there between this element and the common parent(defined by commonclass).
优点是你不需要记住这个元素和公共父元素(由 commonclass 定义)之间有多少代。
回答by MBO
Just add :eq()
selector like this:
只需:eq()
像这样添加选择器:
$("#element").parents(":eq(2)")
You just specify index which parent: 0 for immediate parent, 1 for grand-parent, ...
您只需指定索引哪个父级:0 表示直接父级,1 表示祖父级,...
回答by zzzzBov
If you plan on reusing this functionality, the optimal solution is to make a jQuery plugin:
如果您打算重用此功能,最佳解决方案是制作一个 jQuery 插件:
(function($){
$.fn.nthParent = function(n){
var $p = $(this);
while ( n-- >= 0 )
{
$p = $p.parent();
}
return $p;
};
}(jQuery));
Of course, you may want to extend it to allow for an optional selector and other such things.
当然,您可能希望扩展它以允许可选的选择器和其他类似的东西。
One note: this uses a 0
based index for parents, so nthParent(0)
is the same as calling parent()
. If you'd rather have 1
based indexing, use n-- > 0
一个注意事项:这0
对父项使用基于索引,因此nthParent(0)
与调用parent()
. 如果您更喜欢1
基于索引,请使用n-- > 0
回答by Mouna Cheikhna
you can also use :
您还可以使用:
$(this).ancestors().eq(n)
ex: $(this).ancestors().eq(2)
-> the parent of the parent of this
.
例如:$(this).ancestors().eq(2)
-> 的父级的父级this
。