jQuery选择器上下文问题 [英] jQuery selector context question

问题描述

我正在尝试进行以下选择：

I'm trying to do make the following selection:

$(".program", row)

其中row是包含两个表行的jQuery对象。其中一个tr有类程序。这个选择器似乎找不到它。但是以下工作：

Where "row" is a jQuery object containing two table rows. One of the tr's has the class 'program". This selector doesn't seem to find it. However the following works:

$(".title", row)

其中div.title是tr.program的后代。

where div.title is a descendant of tr.program.

如果我使用jQuery对象作为选择器上下文，我是否无法匹配该jQuery对象的顶级元素？

If I use a jQuery object as a selector context, am I not able to match top-level elements of that jQuery object?

谢谢，

-Morgan

推荐答案

看起来你正在尝试从已经选择的元素中选择元素（驻留在jQuery对象中）。

It looks like you're trying to select elements out of the ones you already have selected (residing in the jQuery object).

就jQuery而言，上下文就像指定一个父类一样 - 上下文是一个节点，它位于DOM树中你所寻找的位置。上下文是jQuery查找你指定的选择器的地方。

Context, as far as jQuery is concerned, is like specifying a parent - the context is a node somewhere ABOVE what you're looking for in the DOM tree. The context is where jQuery will look for the selector you've specified.

如果我对你要做的事情是正确的，那么这应该有效：

If I am correct about what you're attempting to do then this should work:

row.filter('.program');

// And then:
row.filter('.program').find('.title');

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