Selenium finding elements

1. Simple Search

by ID: Webelement element=driver.findelement (by.id ("userId"));

by Name: Webelement element=driver.findelement (by.name ("cheese"));

by TagName: Webelement element=driver.findelement (By.tagname ("a"));

by ClassName: Webelement element=driver.findelement (by.classname ("login"));

by LinkText: Webelement element=driver.findelement (By.linktext ("Blog");

This is very simple, just need to know the ID and so on the attribute value is good. So the question comes, how do you know what the attribute value is? is not always through the Web source one view it! In fact, Firefox has a very powerful plug-in, called Firebug. It is a very classic positioning elements of the Web page and view the source of the Web plugin. The installation method is to search for "Firebug" in the add-ons of Firefox, and then I choose "Firebug 2.0.8" to install.

2.Xpath

For a tutorial on XPath, refer to w3school:http://www.w3school.com.cn/xpath/

Firefox also has a plugin called the XPath Finder to make it easier to locate and to confirm that the XPath is correct. Select Add-ons and search for XPath to see that my version of this is XPath finder 1.02, click Install.

XPath uses a path expression to pick a node or set of nodes in an XML document.

Select a node

The most useful path expressions are listed below:

An expression	Description
NodeName	Select all child nodes of this node.
/	Select from the root node.
//	Selects the nodes in the document from the current node that matches the selection, regardless of their location.
.	Select the current node.
..	Selects the parent node of the current node.
@	Select the attribute.

Predicate

To find a particular node or to contain a specified node of merit. The predicate is embedded in [].

In the table below, we list some path expressions with predicates, as well as the results of expressions:

path expression	result
/b OOKSTORE/BOOK[1]	selects the first book element that belongs to the bookstore child element.
/bookstore/book[last ()]	selects the last book element that belongs to the bookstore child element.
/bookstore/book[last ()-1]	selects the penultimate book element that belongs to the bookstore child element.
/bookstore/book[position () <3]	selects the first two book elements that belong to the child elements of the bookstore element.
//title[@lang]	selects all the title elements that have properties named Lang.
//title[@lang = ' eng ']	selects all title elements that have the Lang attribute value of Eng.
/bookstore/book[price>35.00]	selects all book elements of the bookstore element, and the value of the price element must be greater than 35.0 0.
/bookstore/book[price>35.00]/title	selects all the title elements of the book element in the bookstore element, where p The value of the rice element must be greater than 35.00.

Use: Webelement element=driver.findelement (By.xpath ("//ul[@class = ' nav logged_out ']/li"));

Represents the UL element that first finds the value of the class attribute "Nav logged_out", and then finds all the LI elements below these UL elements.

3.CSS Selector

In fact, most of the elements will have an ID or name, so that through the method 1 can be solved, more exotic complex can also be resolved through XPath. So why do you use CSS? Well, it's said that CSS is the fastest. This needs a bit of CSS skills. I have been watching the tutorial for a long time.

CSS Tutorial: http://www.w3school.com.cn/css/index.asp

Use:list<webelement> webelements = webdriver.findelements (By.cssselector ("Ul.nav li"));

. Nav stands for class= "NAV".

#nav represents id= "NAV".

UL represents the attribute "UL".

The above sentence means selecting all Li under ul of the class attribute value "NAV". Say, a bit around AH ~ ~

Selenium finding elements