哪个 JQuery 选择器会排除与给定选择器匹配的父项的项目? [英] What JQuery selector excludes items with a parent that matches a given selector?

问题描述

我有

var $set = $('.foo,.bar').filter(
    function() {return $(this).parents('.baz').length < 1;});

作为一种选择所有类为 foo 或 bar 且不属于类为 baz.是否有一个选择器可以在不需要过滤 lambda 的情况下完成同样的事情?

as a way to select all the elements whose classes are either foo or bar and who do not descend from an element whose class is baz. Is there a selector that will accomplish the same thing without the need for a filtering lambda?

<div class='foo'/><!--match this-->
<div class='bar'/><!--match this-->
<div class='baz'>
    <div class='foo'/> <!--don't match this-->
</div>

推荐答案

事情的真相是，jQuery 根本没有一个特别优雅的方式来做你想做的事.虽然混乱的答案确实有效，但您必须想知道复杂的选择器(与复杂网页中的选择器一样慢)是否值得您拥有更详细但更快的过滤器功能.这并不是什么大不了的事，我个人只是厌倦了特别长、复杂的选择器，但我可以避免它.

The truth of the matter is that jQuery simply does not have a particularly elegant way to do what you want. While chaos' answer does work, you have to wonder whether the complicated selector (that would be about as slow as a selector can be in a complicated webpage) is worth it over the more verbose but faster filter function you have. This is not really that big of a deal, I am just personally weary of particularly long, convoluted selectors when I can avoid it.

另一种选择是创建自己的选择器，因为 jQuery 很棒:

A different option is to create your own selector, since jQuery is awesome:

jQuery.expr[':'].parents = function(a,i,m){
    return jQuery(a).parents(m[3]).length < 1;
};

$('.foo,.bar').filter(':parents(.baz)');

expr 映射是 Sizzle 选择器引擎的一部分，可以在此处找到文档:嘶嘶作响的自定义伪选择器

The expr map is part of the Sizzle selector engine and documentation can be found here: Sizzle Custom Pseudo-Selectors

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