如何使用Selenium按索引选择Xpath节点集中的指定节点? [英] How to select specified node within Xpath node sets by index with Selenium?

问题描述

我正在编写一个 Selenium 测试用例.这是我用来匹配数据表中所有修改"按钮的 xpath 表达式.

I'm writing a Selenium testcase. And here's the xpath expression I use to match all 'Modify' buttons within a data table.

//img[@title='Modify']

我的问题是，如何通过索引访问匹配的节点集?我试过

My question is, how can I visit the matched node sets by index? I've tried with

//img[@title='Modify'][i]

和

//img[@title='Modify' and position() = i]

但两者都不起作用..我也尝试过 XPath 检查器(一个 firefox 扩展).一共找到了 13 个匹配项，然后我完全不知道我该如何选择其中之一.或者XPath是否支持指定选择不在同一父节点下的节点?

But neither works.. I also tried with XPath checker(One firefox extension). There're totally 13 matches found, then I have totally no idea how am I gonna select one of them.. Or does XPath support specified selection of nodes which are not under same parent node?

推荐答案

这是一个常见问题:

//someName[3]

表示:文档中的所有 someName 元素，即其父元素的第三个 someName 子元素——可能有很多这样的元素.

means: all someName elements in the document, that are the third someName child of their parent -- there may be many such elements.

你想要的正是第三个 someName 元素:

What you want is exactly the 3rd someName element:

(//someName)[3]

说明:[] 的优先级(优先级)高于 //.当您需要指定所选节点列表的第 N 个节点时，请记住始终将 //someName 类型的表达式放在括号中.

Explanation: the [] has a higher precedence (priority) than //. Remember always to put expressions of the type //someName in brackets when you need to specify the Nth node of their selected node-list.

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