Xpath 查询以查找包含某个后代的元素 [英] Xpath query to find elements which contain a certain descendant

问题描述

我正在使用 Html Agility Pack 在网页上运行 xpath 查询.我想在表中找到包含某个有趣元素的行.在下面的示例中，我想获取第二行.

I'm using Html Agility Pack to run xpath queries on a web page. I want to find the rows in a table which contain a certain interesting element. In the example below, I want to fetch the second row.

<table name="important">
<tr>
  <td>Stuff I'm NOT interested in</td>
</tr>
<tr>
  <td>Stuff I'm interested in</td>
  <td><interestingtag/></td>
  <td>More stuff I'm interested in</td>
</tr>
<tr>
  <td>Stuff I'm NOT interested in</td>
</tr>
<tr>
  <td>Stuff I'm NOT interested in</td>
</tr>
</table>

我想做这样的事情:

//table[@name='important']/tr[has a descendant named interestingtag]

除非使用有效的 xpath 语法.;-)

Except with valid xpath syntax. ;-)

我想我可以找到有趣的元素本身，然后从返回的节点沿着父链向上移动，但似乎应该有一种方法可以一步完成，而我只是密集.

I suppose I could just find the interesting element itself and then work my way up the parent chain from the node that's returned, but it seemed like there ought to be a way to do this in one step and I'm just being dense.

推荐答案

"has a后代名为 interestintag" 在 XPath 中拼写为 .//interestintag，因此您要查找的表达式为:

"has a descendant named interestintag" is spelled .//interestintag in XPath, so the expression you are looking for is:

//table[@name='important']/tr[.//interestingtag]

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