Element positioning XPath simple operation sharing

XPath simple and practical learning Selenium2

In order to learn the element positioning to start learning xpath, now record the learning experience for your reference.

What is XPath?

XPath uses path expressions to navigate through XML documents

XPath contains a standard function library

XPath is the main element in XSLT

XPath is a W3C standard

In XPath, there are seven types of nodes: elements, attributes, text, namespaces, processing instructions, comments, and document (root) nodes. XML documents are treated as node trees. The root of a tree is called a document node or root node.

The most useful path expressions are listed below:

Expression.

Description

Nodename

Select all the children of this node.

/

Select from the root node.

/ /

Selects nodes in the document from the current node that matches the selection, regardless of their location.

.

Select the current node.

..

Select the parent node of the current node.

@

Select the attribute.

Select unknown node

XPath wildcards can be used to select unknown XML elements.

Wildcard character

Description

*

Matches any element node.

@ *

Matches any attribute node.

Node ()

Matches any type of node.

Learn by yourself:

1. Take a look at the xpath rules

2. Install Firefox plug-ins Firebug, FirePath, ViewXpath plug-ins

Comparative learning:

See XPath:.//* [@ id='su']; remember this [. / / * [@ =]]

open

Try to write it.

Install this rule to write whether other locations can also be displayed:

Hands-on practice, will be a simple positioning, this is today took a little time, learn, thank the older teachers.