jQuery查找似乎不起作用

问题描述：

我有一个DocumentFragment存储在"selectedContents"中，我正在尝试借助jQuery在其中找到"span"元素.它有两个子节点，第一个是文本节点，第二个是跨度.

I have a DocumentFragment stored in "selectedContents", and I am trying to find "span" elements in it, with the help of jQuery. It has two child nodes, where the first one is a text node, and the second one a span.

当我尝试$(selectedContents.childNodes).find('span')时，它返回一个空集！

When I try $(selectedContents.childNodes).find('span'), it returns an empty set!

但是，当我打印"$(selectedContents.childNodes)[1].localName"时，它会显示"span"！

However, when I print the "$(selectedContents.childNodes)[1].localName" it says "span"!

我的发现有什么问题吗?请帮忙.

Is there anything wrong in my find? Please help.

谢谢
斯里坎特

Thanks
Srikanth

答

由于要传递元素集合，因此需要使用.filter()从集合中过滤出<span>.

Because you're passing a collection of elements, you need to use .filter() to filter the <span> out of the set.

$(selectedContents.childNodes).filter('span');

http://api.jquery.com/filter/

http://api.jquery.com/filter/

.find()方法用于搜索后代.

编辑:请注意，将childNodes传递到jQuery对象中的方法是正确的.正如某些建议一样，您不能通过documentFragment.

Note that your approach of passing the childNodes into the jQuery object is correct. You can't pass a documentFragment as some suggest.

这里有一个示例来说明: http://jsfiddle.net/P8nur/

jQuery查找似乎不起作用

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