什么是正确的XPath表达式？(What is the right XPath expression?)

什么是正确的XPath表达式？(What is the right XPath expression?)

给出Wiki页面中的以下HTML：

<li> <a href="/wiki/Aluminium_bromide" title="Aluminium bromide">Aluminium bromide</a> – AlBr ₃ </li>

XPath表达式应该是什么，能够返回：

的AlBr 3

我努力了：

string(//li[/a = "Aluminium bromide"]//-)

但它只是返回一个错误。

Given the following HTML from a Wiki page:

<li> <a href="/wiki/Aluminium_bromide" title="Aluminium bromide">Aluminium bromide</a> – AlBr ₃ </li>

what should the XPath expression be, to be able to return:

AlBr3

I have tried:

string(//li[/a = "Aluminium bromide"]//-)

But it just returns an error.

最满意答案

这有点棘手，因为节点嵌套的方式。

但你可以说“ <li>里面的所有文本节点都包含一个值为'溴化铝'的<a> ，除了<a>本身的文本节点”。

//li[a = 'Aluminium bromide']//text()[not(parent::a)]

然后做一些后处理（加入，修剪等）。

That's a bit tricky because the way the nodes are nested.

But you could say "all text nodes inside the <li> that contains an <a> with a value of 'Aluminium bromide', except the text node of that <a> itself".

//li[a = 'Aluminium bromide']//text()[not(parent::a)]

and then do some post-processing (join, trim, etc).