Xpath 1.0 获取先前不是静态位置的元素值 [英] Xpath 1.0 get previous element value which is not static position

问题描述

我的html结构如下

 
 标题 1
<br><br><div class="active"></div><h2>标题2</h2><br><br><div class="active"></div><div></div><div></div><div class="active"></div><h2>标题3</h2><br><br><div></div><div></div><h2>标题4</h2><br><br><div></div><div class="active"></div><div></div>

我想根据具有 active 类的 div 获取前一个 h2 的值

用于选择节点的我的 xpath 后代轴如下

//div[contains(@class, 'active')]

我尝试了 Xpath 的 祖先 和 前置 轴，但没有得到正确的结果

Xpath 1.0 是否可以实现

注意:我只能使用 Xpath 1.0 版

提前致谢

解决方案

这个 XPath 表达式:

//div[@class='active']/preceding-sibling::h2[1]

可以理解为

<块引用>

选择每个活动

元素之前的第一个

元素."

应该为您解决问题.

My html structure as below

    <h2>Title 1</h2>
    <br>
    <br>
    <div class="active"></div>
    <h2>Title 2</h2>
    <br>
    <br>
    <div class="active"></div>
    <div></div>
    <div></div>
    <div class="active"></div>
    <h2>Title 3</h2>
    <br>
    <br>
    <div></div>
    <div></div>
    <h2>Title 4</h2>
    <br>
    <br>
    <div></div>
    <div class="active"></div>
    <div></div>

I would like to get previous first h2's value according to divs which has got active class

My xpath descendants axes for selecting nodes as below

//div[contains(@class, 'active')]

I have tried ancestor and preceding axes of Xpath but not get right result

is this possible with Xpath 1.0

Note: I can use only Xpath version 1.0

Thank you in advance

解决方案

This XPath expression:

//div[@class='active']/preceding-sibling::h2[1]

which can be read as

"Select the first <h2> element before every active <div> element."

should do the trick for you.

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