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Intermediate

Successful candidates should recognize this as one of the most basic applications of XSLT. If they are not able to construct a reply similar to the example below, they should at 

least be able to identify the components necessary for this operation: xsl:template to match the appropriate XML element, xsl:value-of to select the attribute value, and the optional 
xsl:apply-templates to continue processing the document.

When you are working with the DOM4J, there are several methods you will use often -
SAXReader.read(xmlSource)() - Build the DOM4J document from the xml source.
Document.getRootElement() - Get the root element of the XML.
Element.node(index) - Get the XML node at particular index in the element.
Element.attributes() - Get all the attributes of an element.
Node.valueOf(@Name) - Get the value of an attribute with given name of the element.


The DOM4J defines several Java classes. Here are the most common classes -

Document - Represents the entire XML document. A Document object is often referred to as a DOM tree.
Element - Represents an XML element. Element object has methods to manipulate its child elements,its text, attributes and namespaces.
Attribute - Represents an attribute of an element. Attribute has method to get and set the value of attribute. It has parent and attribute type.
Node - Represents Element, Attribute or ProcessingInstruction


Reading Xml with JQuery is an easier approach if we have interest on the usage of client-side script as this script does not post back the whole page to the server and hence, speed the network performance.

Instead of enabling tracing for individual pages, you can enable it for your entire application. In that case, every page in your application displays trace information. Application tracing is useful when you are developing an application because you can easily enable it and disable it without editing individual pages. When your application is complete, you can turn off tracing for all pages at once.

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