如何选择该跨度元素? [英] How can i select this span element?

问题描述

我只是从Selenium开始，现在需要选择此元素:

I am just starting with Selenium and now in need to select this element:

<span class=" close">Matrices</span>

这一行代码返回零个元素，所以我猜它不是正确的一个:-)

This line of code returns zero elements, so i guess it's not the right one :-)

ReadOnlyCollection<IWebElement> matrixLink = driver.FindElements(By.PartialLinkText("Matrices"));

但是，除了Xpath之外，我找不到另一个合适的，但看起来像这样(//*[@id=\"Navigation\"]/div[2]/div[2]/ul/li[7]/span)，对我来说似乎有点脆弱?

But I could not find another one suitable, besides the Xpath, but that looks like this (//*[@id=\"Navigation\"]/div[2]/div[2]/ul/li[7]/span), and that seems a bit fragile to me?

编辑: 该范围具有关闭"类. 它是菜单的一部分，其中有19个跨度为'close'的类，因此很遗憾，它不是唯一的选择器....

EDIT: the span has the class 'close'. It's part of a menu, where there are 19 span's with the class 'close' so it's not a unique selector unfortunately....

推荐答案

这将起作用:

//*[@id=\"Navigation\"]/descendant::span[text()='Matrices']

请注意，如果可以的话，请在您的XPath查询中进行具体说明，主要是为了提高可读性和提高性能...这就是查询中的*将查询页面中的 all 元素.我不知道 Navigation 元素是哪种元素，但是您应该输入确切的元素类型，例如，如果它是div，则将其设置为

Note that if you can, be specific in your XPath queries, mainly to aid readability and improve performance...that is the * in your query will query all elements in the page. I don't know what kind of element the Navigation element is, but you should put it's exact element type in, for instance if it's a div, make it:

//div[@id=\"Navigation\"]/descendant::span[text()='Matrices']

对此XPath的一个简短解释是，它将捕获Navigation元素，并且只需在其中的任何地方查找 即可找到文本为Matrices的span元素.如果没有XPath中的descendant位，它将仅搜索直接子级.这意味着元素是Navigation的子元素，别无其他-因此，如果元素是TestDiv的子元素，而TestDiv是Navigation的子元素，则descendant会捕获它，如果没有它，您将不会返回任何结果

A slight explanation for this XPath is that it will grab the Navigation element, and simply look anywhere inside it to find a span element that has the text of Matrices. Without the descendant bit in the XPath, it would only search for direct children. That means elements that a child of Navigation, nothing else - so if an element is a child of TestDiv which is a child of Navigation, descendant would catch it, without it you won't return any results.

关于为什么By.PartialLinkText不起作用的原因，这只会搜索锚链接.如您所见，锚链接内部通常有一个span元素，有时它本身只是一个span.

As for why By.PartialLinkText would not work, this would only search for anchor links. It is common, as you have seen, that anchor links have a span element inside them or sometimes it is just a span on it's own.

By.PartialLinkText和类似的By.LinkText不会看到"该元素，因为它不是锚元素.

By.PartialLinkText and similarly By.LinkText would not 'see' this element, since it's not an anchor element.

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