selenium-python-LocatingByXPath

最新推荐文章于 2025-08-15 18:35:50 发布

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本文介绍了如何使用XPath来定位HTML文档中的元素，尤其适用于缺乏唯一标识符的情况。通过实例展示了XPath的强大功能，包括绝对路径与相对路径的选择策略，并推荐了一些学习资源和浏览器插件。

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XPath is the language used for locating nodes in an XML document. As HTML can be an implementation of XML (XHTML), Selenium users can leverage this powerful language to target elements in their web applications. XPath extends beyond (as well as supporting) the simple methods of locating by id or name attributes, and opens up all sorts of new possibilities such as locating the third checkbox on the page.

One of the main reasons for using XPath is when you don’t have a suitable id or name attribute for the element you wish to locate. You can use XPath to either locate the element in absolute terms (not advised), or relative to an element that does have an id or name attribute. XPath locators can also be used to specify elements via attributes other than id and name.

Absolute XPaths contain the location of all elements from the root (html) and as a result are likely to fail with only the slightest adjustment to the application. By finding a nearby element with an id or name attribute (ideally a parent element) you can locate your target element based on the relationship. This is much less likely to change and can make your tests more robust.

For instance, conside this page source:

 
  <html>
 <body>
  <form id="loginForm">
   <input name="username" type="text" />
   <input name="password" type="password" />
   <input name="continue" type="submit" value="Login" />
   <input name="continue" type="button" value="Clear" />
  </form>
</body>
<html>
 
 

The form elements can be located like this:

 
  login_form = driver.find_element_by_xpath("/html/body/form[1]")
login_form = driver.find_element_by_xpath("//form[1]")
login_form = driver.find_element_by_xpath("//form[@id='loginForm']")

Absolute path (would break if the HTML was changed only slightly)
First form element in the HTML
The form element with attribute named id and the value loginForm

The username element can be located like this:

 
  username = driver.find_element_by_xpath("//form[input/@name='username']")
username = driver.find_element_by_xpath("//form[@id='loginForm']/input[1]")
username = driver.find_element_by_xpath("//input[@name='username']")

First form element with an input child element with attribute named name and the value username
First input child element of the form element with attribute named id and the value loginForm
First input element with attribute named ‘name’ and the value username

The “Clear” button element can be located like this:

 
  clear_button = driver.find_element_by_xpath("//input[@name='continue'][@type='button']")
clear_button = driver.find_element_by_xpath("//form[@id='loginForm']/input[4]")

Input with attribute named name and the value continue and attribute named type and the value button
Fourth input child element of the form element with attribute named id and value loginForm

These examples cover some basics, but in order to learn more, the following references are recommended:

W3Schools XPath Tutorial
W3C XPath Recommendation
XPath Tutorial - with interactive examples.

There are also a couple of very useful Add-ons that can assist in discovering the XPath of an element:

XPath Checker - suggests XPath and can be used to test XPath results.
Firebug - XPath suggestions are just one of the many powerful features of this very useful add-on.
XPath Helper - for Google Chrome